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1. The characteristics of CNC Metal spinning are that it is suitable for small and medium batch production, the wall thickness of the processing material is large, the forming drawing length is large, the processing accuracy is medium, and the shape of the rotating thin-walled parts is complex. Compared with CNC Metal spinning, manual spinning technology is limited by manpower and cannot process spinning products with larger thicknesses. When stamping and deep drawing process metal forming products of the same thickness, the required processing force is 3% of spinning. -5 times, so stretch stamping requires a large tonnage punch or hydraulic press to process aluminum with a thickness of 4mm or more, stainless steel with a thickness of 2mm, and iron with a thickness of 3mm. After mass production of the product, the forming speed of stretch stamping will be faster than that of CNC Metal spinning, and the unit cost will be lower. For products with larger stretch lengths, stretch stamping is prone to cracking, while Metal spinning takes a longer time to form a single product. Typically, Metal spinning is used to make semi-finished blanks and then Metal spinning is used to make the final product. The combination of the two processes can greatly improve the production efficiency of the product and reduce the reject rate of the product. Aluminum/Alloy Products and Iron/Galvanized Products are easy to combine spinning and drawing. Due to the high hardness of stainless steel, the stretched billet is prone to cracks at the spinning joint. 2 . CNC spinning machine idling accuracy is 0.04mm. Due to the influence of material flow and stress rebound during the spinning process, the precision of the processed product cannot reach 0.04mm. Among the three materials of aluminum, iron and stainless steel, the accuracy of Stainless steel Metal spinning is the most difficult to control. Taking the diameter of 100mm as the benchmark, the diameter accuracy of general aluminum spinning parts can reach 0.1mm, and the diameter of iron is about 0.2mm. , the diameter accuracy of Stainless steel is about 0.4mm. The larger the product diameter, the worse the accuracy. Strong rotation is more accurate than normal rotation. When the spinning parts have assembly accuracy requirements, they can be finished. At present, the product series widely used in CNC Metal spinning include Lamp Shade, Stainless steel bowl, Lighting Downlight, Aluminum Cup, Reflector Shade, shielding cover, signal reflector, signal receiving cover, chemical container, power container, aluminum barrel, stainless steel barrel, Ventilation ducts, funnels, electrical liner, motor protective cover, etc. CNC Metal spinning process is more suitable for such special customized, small and medium batch processing products.

Numerical control lathe guide bearing usually by thin oil lubrication bearing, its composition is mainly composed of bearing cover, tubing, cooler, oil box, bearing, bearing, thermometer and carrying screw, two unit guide sleeve is commonly 8, according to the circular uniform distribution on the generator main journal, in the process of the use of the numerical control lathe, hard to avoid can appear some fault, CNC lathe guide bearing temperature is too high, burning tile is one of the common problems, the following is a brief introduction to the cause of high temperature guide bearing and how to solve this kind of failure. The main purpose of the CNC lathe guide bearing is to limit the work of the main shaft of the generator, so that it can only be in the specified guide bearing clearance range with the radial load on the main shaft of the generator. The reasons for the high temperature of the guide bearing are as follows: First, the contact point of the surface of the shaft tile is relatively small, so that the contact surface is insufficient and does not meet the requirements of the equipment specifications. Second, increase the clearance of the bearing is far greater than the required clearance at the time of design, so it will make it difficult for lubricating oil to enter the bearing surface, it is not easy to form an oil wedge, resulting in poor lubrication, leading to further increase in the temperature of the guide bearing, the vibration of the unit increases. According to the design requirements of machine tool factory, when the CNC lathe is working continuously, the temperature of cooling water can not exceed 25 degrees, and the temperature of ceramic tile and oil can not exceed 65 degrees. The variation of oil temperature and wattage is not only related to the temperature of cooling water, but also to the circulation of lubricating oil and the clearance between spindle and journal. For CNC lath-oriented bearings, clearance of 0.2 to 0.3mm can be allowed, and the lower part of the bearing is immersed in the lubricating oil. When the spindle runs clockwise, the lubricating oil is easier to enter the bearing surface of the guide bearing, and the oil wedge is generated. When lubricating ceramic tile surface, which is the biggest swing of through spindle points, although its minimum matching gap, however, due to the short distance, good lubrication condition, the friction heat is small, the cooling effect is better also, usually will not cause bearing temperature rise, also won't lead to ceramic tile burning problems. What are the reasons for the unstable machining accuracy of CNC lathes? How to determine the route of nc lathe processing tool retreat?

In the actual cutting process, the inclined bed CNC lathe has the function of matching power tools and 8 stations turret tool rest, so it can play an important role in the processing of different products, especially in the complex, high-precision parts obviously have the advantage of other products do not have. Installation of CNC lathe with inclined bed 1, the inclined bed CNC lathe is placed on the foundation, must be levelled in free state, and locked by the anchor bolt. 2. For ordinary machine tools, the level reading will not be higher than 0.04/1000mm, and if it is a high-precision CNC machine tool, the level is not It will be higher than 0.02/1000mm. When measuring the installation accuracy, we often need to carry out at a constant temperature, and the measuring tool needs to pass through a Period of Time fixed temperature after use. 3, oblique CNC lathe in the installation, to reduce the numerical control machine tool caused by forced deformation of the installation method. 4, oblique bed CNC lathe installation can not casually remove some parts of the machine tool, if the removal of some parts, it is likely to be made The internal stress of CNC lathes should be distributed again, thus affecting the accuracy of machine tools. Preparation of inclined bed CNC lathe before test run 1, before use, the inclined bed CNC lathe should pass the geometric accuracy test first, and then clean the whole machine. Specifically, is to use cotton cloth or silk containing detergent to wash, this stage may not use cotton or gauze, lest appear machine jam phenomenon, that is to say, the slant bed CNC lathes in the factory to protect the guideway and the machined surface and coated with anti-rust oil or wash away anti-rust paint, clean the surface dirt at the same time. At the same time, each sliding surface and working surface is coated with the manufacturer's specified lubricating oil. 2, also carefully check whether all parts of the inclined bed CNC lathe have been filled up with oil according to the relevant requirements, and whether the coolant in the cooling box is sufficient. Whether the oil of machine tool hydraulic station and automatic lubricating device can reach the part specified by oil level marker. 3. At the same time, check whether the switches and components in the electrical control box are normal and whether the integrated circuit board is in normal operation. 4, after the power, we also need to start the centralized lubrication loading, to ensure that there is enough lubricating oil on the lubricating part and lubricating oil road, in order to do a series of preparatory work before the use of the machine tool.

1, CNC machine tool CNC electric box inspection Open the door of the CNC electrical box, check all kinds of interface sockets, servo motor feedback line sockets, spindle pulse generator sockets, hand pulse generator sockets, CRT sockets, etc., if there is loose to plug again, lock the locking mechanism must be locked. Check the setting of the short-circuit terminal on the printed circuit board according to the manual, and be sure to conform to the state set by the CNC machine tool factory. If there is any error, it should be reset. In general, there is no need to reset, but the user must make original records of the setting state of the short-circuit terminal. Wiring quality Check All wiring terminals. Including the terminals connected by the machine tool manufacturer during the assembly of strong and weak electric parts and the terminals of each motor power line, each terminal should be fastened once with a screw until it cannot be screwed with a screw, and each motor socket must be tightened. 2, CNC machine electrical inspection Remind slant bed CNC lathe nc machine tools should be open the electric cabinet of machine before use, check the relay, contactor, fuse, servo motor, speed control unit socket, spindle motor speed control unit such as presence of loose socket, such as loose should return to normal state, a locking mechanism of connectors must lock, a connecting box transfer machine be sure to check box on the socket, Whether the wiring is loose, there is a locking mechanism must be locked. 3, CNC machine check the connection of all buttons, switches and indicators on the operation panel. If any error is found, it should be dealt with immediately. Check the socket and wiring on the CRT unit. Check the grounding cable. Check the grounding cable of the machine tool. The grounding resistance should not be greater than 1 Ohm. Check the phase sequence of the power supply. Check the phase sequence of the input power supply with the phase sequence table. Make sure that the phase sequence of the input power supply is absolutely consistent with the phase sequence of the power supply calibrated everywhere on the machine tool. 4, CNC machine solenoid valve inspection All solenoid valves should be pushed several times by hand, in order to prevent the bad action caused by long time no electricity, such as abnormal, should be recorded, in order to confirm repair or replacement after electricity. 5, CNC machine limit switch inspection Check all limit switch action flexible and fixed whether firm, found bad action or fixed should be dealt with immediately. Check buttons and switches on the operation panel, 6, CNC machine tools with secondary wiring equipment, such as power transformers, must confirm the consistency of the phase sequence of the secondary wiring. Make sure the phase sequence is absolutely correct. At this time, the power supply voltage should be measured and recorded. The above is to bring you the inspection of CNC lathe before use. What are the reasons for affecting the machining accuracy of machine tools? CNC lathe servo system alarm and other common faults maintenance

1, CNC lathe in the production of parts before processing, according to the design and analysis of the process plan of the machined parts, and then programming. Should be the first preparation of the work of the processing process, if the workpiece processing program is long and particularly complex, try not to program on the machine tool, you can use programming machine programming or manual programming, so as to avoid the occupation of time, and for the program is short, should also be written in the program list. 2, for the input of the processing program, you can choose the interface of the computer and CNC lathe for direct communication, the preparation of parts of the processing program input to the CNC system. Then also need to pre-adjust the tool and fixture, according to the parts of the processing process design to determine the tool and fixture program, before processing parts, install and adjust the tool and fixture. Then the NUMERICAL control device for processing procedures for decoding and operation processing, processing will become a pulse signal, will be sent to the servo system of the lathe, and then through the transmission mechanism to drive the relevant parts of the machine tool, complete the cutting and processing of parts. There will be sent to the programmable controller, in accordance with the order to control the other auxiliary parts of the machine tool, so as to complete the workpiece clamping, loosening, coolant opening and closing, automatic replacement of tools and other actions. About the key points of clamping can refer to the six points of nc lathe clamping attention. 3, the process of starting CNC lathe is to start the machine tool first, and then start the system. Because some designs are interlocked, the machine tool can not display the corresponding information on the CRT without power. Turning reference point, for the incremental control system of CNC lathes, must be implemented this step, the establishment of the machine tool coordinates of the movement standard. 4, for the input program if you need to modify, then you need to edit the operation. At this point, place the mode selector switch in the EDIT position and use the EDIT key to add, delete, change, etc. If the CNC lathe is locked, the program needs to be checked, and if errors are found, it needs to be re-edited. 5, and then on the workpiece, find knife to knife operation, choose manual incremental movement, continuous movement or the use of hand sowing disk moving lathe. Point the tool to the starting point of the program and check the tool reference. 6, start the coordinate feed, continuous processing of parts, usually using the program in memory processing, for this way than using the program on paper tape processing failure rate is lower. Feed rate can be switched to adjust the feed speed in machining. In the process of processing, the FEEDHOLD button, also known as FEEDHOLD, can be pressed to suspend the feed movement and observe the processing situation or make manual measurement. Once finished, the CYCLESTART button is pressed to resume the job. To ensure that the process is free of errors, a careful review is required before processing. For the plane curve of the workpiece processing, you can use a pencil to replace the tool on paper to draw the outline of the work piece, so you can see intuitively, if the system has tool trajectory simulation function, you can use it to check the program is correct or not. 7, CRT can display each screen display table or tool position, program and CNC lathe status information, so convenient for operators to monitor the processing process. When the program is finished, if the program needs to be saved, it can be left in the MEMORY of CNC. If the program is long, it can be saved by external devices. 8, for parts detection and dismantling operations, in the case of the workpiece is still in the chuck clamping, workpiece size detection, if the size of the workpiece is not qualified, the need to carry out appropriate tool compensation operations, new processing, when the size of the workpiece is qualified. After the completion of all process operations, shutdown, shutdown is also the first to close the CNC lathe, and then the system. Safety protection device for 6140 chuck of common lathe Causes and solutions of workpiece size deviation in NC lathe machining

For nc machine tool fault maintenance need technical personnel with professional technology, have wide knowledge and experience, for non-professional personnel must not repair, alone for fault need quick and according to the judgment of the fault location, fault repair methods, understanding and mastering the numerical control machine tool of the diagnostic method of the components of each device, reasonable operation, Can improve the maintenance of CNC machine tools, CNC machine tool maintenance ability, and make it normal, stable operation. At the same time, we must prepare the necessary tools, for CNC machine tool maintenance tools, detectors and meters are essential. The following simple introduction of CNC machine tools more common faults and the corresponding maintenance methods, for reference only. One, about the power failure of CNC machine tools In order to avoid power failure, in the design of the power supply system of CNC machine tools, we must do the following, first of all, we must have an independent distribution box, not in series with other equipment. The beginning of the power supply must be well grounded. The three-phase power supply into the CNC machine must use three-phase five-wire system, the middle line and the ground line must be separated. The electrical components in the electric cabinet should be laid out reasonably, and the laying of alternating current and direct current must be isolated accordingly. Two, CNC machine tool system position ring failure This kind of failure may be caused by component damage, interface signal loss and other reasons. It may also be caused by the coordinate axis moving without instructions, or too much drift, position-loop or velocity loop connected into positive feedback. This may be because related parameters are no longer in the matching state. Therefore, you must adjust them again after troubleshooting. Three, numerical control machine tool dynamic characteristics deteriorate fault When the quality of the workpiece in the decline, will cause the CNC machine tool factory vibration. This is usually because the clearance of the mechanical transmission system is too large, or even caused by serious wear. For the electrical control system, it may also be because the relevant parameters are not in a better matching position, and the equipment should be removed after the corresponding adjustment. Four, nc machine tool coordinates can not find zero fault When the coordinate of CNC machine tool cannot find zero, it may be that the distance between zero direction and zero direction is far away, or the encoder is damaged, resulting in the shift of the zero mark of the grating. 5. Data machine tools have occasional downtime When there is incidental outage numerically-controlled machine tool machine tool plant, usually leads to the following two reasons, one is that there is a problem in the design of the software, cause certain operations and function combination fault happened, and then cause downtime, if is such a case, can after power equipment, and then to connect the power and can solve such problems. In addition, there is a kind of circumstance is the reason why environment as a result, such as the disturbance of power grid and peripheral equipment, or excessive temperature condition, etc., in many parts of the machine tools will be near the doors open position, this will lead to electric cabinet door operation will produce some dust and dust, or the situation of the water mist, in order to avoid such problems, Need to improve the peripheral environment of CNC lathe itself. How to improve the machining accuracy of CNC lathe? Safety protection device for 6140 chuck of common lathe

Due to the advantages of CNC lathe in the production of hardware standard parts, it takes up more and more proportion in the production process of practice, and the economic benefits of enterprises and manufacturers are much higher than ordinary lathes. Numerical control lathe has obvious advantages compared with ordinary lathes. The specific differences are as follows: First, numerical control lathe has a great advantage in accuracy compared with ordinary lathe Ordinary lathes generally rely on gears and screw nuts for transmission, because there is a gap between each movement, and then coupled with the operator's manual operation is not accurate, so its repetition accuracy is relatively low. In measurement, ordinary lathes need to be manually measured after parking, so the measurement error is large. For CNC lathes, CNC lathes mainly rely on driving motor to drive ball screw transmission, ball screw through pre-stretching equipment after interference, its transmission without clearance, its accuracy mainly depends on the machine itself and program setting to ensure. And CNC lathe in the process of processing can be carried out through the encoder azimuth measurement, can compensate tool wear, and other reasons caused by the error problem, so the workpiece quality is better processed, the accuracy is more stable. Two, CNC lathe processing parts of the qualified rate is higher than ordinary lathe Because ordinary lathes need manual operation, the requirements for operators are higher, the human impact is also greater, if the operator's body is not good, or the mind is not focused, the processing of parts reject rate will be relatively high. And CNC lathes rely on equipment to ensure processing accuracy, operators will only play the role of loading and unloading work and switch, that is to say, the influence of small, so the workpiece pass rate is higher. Three, numerical control lathe in the mass production processing parts than ordinary lathe efficiency is higher Ordinary lathe although only need a skilled staff to operate equipment operation, however, due to the use manual three jaw chuck, and the need to manually after parking measurement during measurement, so will delay the processing efficiency, and numerical control lathe in batch production, using the hydraulic chuck or under the premise of spring collet clamping workpiece, A person without any operating skills can operate at least two CNC lathes at the same time, producing about four times the power of ordinary lathes. Four, CNC lathe single processing cost is slightly higher than ordinary lathe Numerical control lathe in processing production cost is higher than ordinary lathe, if through improvement, numerical control lathe in a single production cost and power will be better than ordinary lathe. Fifth, CNC lathes are more expensive than ordinary lathes Although machine tool factory CNC lathes have greater advantages than ordinary lathes in single production rate, processing parts speed, accuracy, the price of the equipment itself is more expensive than ordinary lathes, about 1.5 times more than ordinary lathes. About CNC lathe parts processing operation process How to improve the machining accuracy of CNC lathe?

CNC lathe manufacturers tell you that when CNC lathe presents the following fault phenomenon, we should first consider whether it is caused by the fault of the detection equipment in the servo system, and correct analysis to find the fault part. 1. Display servo system alarm Pay attention to this moment: (1) The axial pulse encoder responds to signal disconnection, short circuit and signal loss, and uses oscilloscope to measure signal of phase A and phase B to see whether it is normal. (2) The internal defects of the encoder, the formation of the signal can not be correctly accepted, check its pollution, too dirty, deformation, etc.. 2. Abnormal speed of mechanical movement (flying car) To repair such faults, we should check the working conditions of the azimuth control unit and the speed control unit together, and also check the points: (1) Whether the wiring of pulse encoder is wrong, check whether the wiring of encoder is positive reaction, and whether phase A and phase B are connected in reverse. (2) Whether the coupling of pulse encoder is damaged, if damaged, replace the coupling. (3) Check whether the terminal of the velocimeter generator is connected inversely and the excitation signal line is connected incorrectly. 3, mechanical vibration (acceleration/deceleration) Common causes of such problems include: (1) The pulse encoder is defective. At this moment, we should check whether the voltage on the reaction line terminal on the speed detection unit drops at a certain point. If there is a drop, it indicates that the pulse encoder is defective and the encoder should be replaced. (2) The pulse encoder cross coupling may be damaged, resulting in the shaft speed is not synchronized with the detected speed. Replace the coupling. (3) The velocimeter generator is defective, repaired and replaced. In repair practice, there are many problems of speed measuring brush wear and jam resistance. Should disassemble the speed machine, be careful to remove the brush, polish it on fine sandpaper a few times, clean the dirt of the commutator together, and then install it from scratch. 4. Vibration when coordinate axis is fed During maintenance, we should check whether the motor coil is short-circuiting, whether the connection between the mechanical feed screw and the motor is outstanding, and whether the whole servo system is stable, check whether the pulse coding is outstanding, whether the coupling is stable and reliable, and whether the speed detector is reliable. 5, the spindle can not be directional movement or directional movement is not in place Maintenance of such problems, should be in view of the directional control circuit setting adjustment, view the directional board, spindle control of the printed circuit board adjustment together, should check the azimuth detector (encoder) is bad, at the moment generally to measure the output waveform of the encoder, through the discrimination of output waveform is normal to determine the quality of the encoder. (Repair personnel should pay attention to record the normal output waveform of the encoder when the equipment is normal, so as to check the fault.) 6. Present NC fault alarm NC alarm due to program fault, operation fault caused by the alarm. Such as FAUNUC6ME system NC alarm 090.091. NC alarm is presented, which may be caused by main circuit fault and low feed speed. Together, and possibly: (1) Poor pulse encoder. (2) The power supply voltage of the pulse encoder is too low (at this moment, adjust the power supply voltage of 15V to make the voltage value on the +5V terminal of the main circuit board within 4.95-5.10V). (3) There is no input pulse encoder of a turn signal and can not normally perform the reference point back.

Numerical control lathe in the process of high-speed processing, if you want to improve the efficiency of its processing, then, choose the right tool is relatively important, the right tool can improve the processing efficiency of numerical control lathe. For the choice of cutting tools, the main consideration should be CNC machine tool processing capacity, process content, as well as various factors of workpiece materials. For numerical control lathe, the choice of cutting tool requires not only high abrasion resistance, enough toughness and strength, but also has high hardness, high heat resistance and good process performance, at the same time also require size stability, adjust the installation more convenient, so you should use new material with high quality manufacturing nc machining tool, and the need to optimize the parameters of the cutting tool, Mainly make the size of the tool and the workpiece surface size and shape to be processed. First, you need to choose the right and appropriate tool. In the process of numerical control lathe machining, metal cutting tool's role is particularly important, for cutting tool manufacturing materials have to has high wear resistance, heat resistance and high hardness, but also has enough strength and toughness, and good thermal conductivity and manufacturability, and also has a good economic performance, if too high nor appropriate. In the process of selecting tools, we should meet the processing requirements of parts under the premise of the larger diameter of the tool as far as possible, its strength and toughness is better. In the same process, the number of selected knives as little as possible to reduce the number of knife changes. In the selection of cutting tools as far as possible to choose general standard cutting tools, do not choose or use less special non-standard cutting tools. Two, to reasonably determine the appropriate knife point. The tool point is mainly used in the processing of parts in the machine tool, tool relative to the starting point of the workpiece movement, also known as the starting point of the program or referred to as the tool point. The selection of knife points should strictly comply with the following points: convenient for digital processing and simplified programming; It is easy to find the right need on the lathe, and the processing is convenient for inspection. The resulting machining error needs to be minimal. The position of the knife point can be selected on the workpiece, of course, you can also choose outside the workpiece, such as fixture or lathe, but it must have a certain size relationship with the positioning datum of the part. The knife point should do its best to choose on the design benchmark or process benchmark of the parts, such as the workpiece with hole positioning, you can choose the center of the hole as the knife point. The position of the tool needs to be aligned with this hole, so that the position point and the tool point coincide. In this way, it can better improve the efficiency of the knife, so as to ensure the quality of machine processing. How to determine the route of nc lathe processing tool retreat? What are the reasons for affecting the machining accuracy of machine tools?

There are many reasons for the instability of CNC lathe processing accuracy, as long as we find specific reasons, we can seek the corresponding solution, the following simple introduction of CNC lathe processing accuracy instability of several reasons, and the corresponding solution, for user reference only. 1, the size of the workpiece is correct, but the surface finish is poor, resulting in damage to the tip, the tip is not sharp, CNC lathe resonance, unstable placement, lathe crawling, poor processing technology will lead to CNC lathe processing accuracy instability. Solution: in the nc lathe uneven position or resonance position, should be adjusted horizontal position, in order to lay its foundation conditions. 2, the driving phase lamp is normal, but the size of the workpiece is large and small. Because the CNC lathe tool rest for a long time operation, screw and bearing position appears certain wear, the tool rest repeated positioning accuracy is used for a long time, in the process of use there is a deviation. The trolley may return to the exact starting point of the machining each time, but the size of the workpiece is still changing. Solution: at this point, dial indicator should be used at the bottom of the tool rest, through the system to edit the shielding loop program. Check the repeated positioning accuracy of the tool rest, adjust the clearance of the screw, and replace the bearing. And also use a dial meter to check the repeated positioning accuracy of the tool bar. 3, the workpiece taper is larger, the horizontal position of the CNC lathe adjustment is not appropriate. In the turning of the long shaft, because the materials used are usually harder, resulting in a deeper tool, resulting in the scrap of the tool. Solution: select reasonable processing method, appropriate cutting dosage, avoid tool forced damage, adjust its tailstock. There is a difference between the tail casing and the spindle. Solution: use a level to adjust the level of the CNC lathe, and then fix the CNC lathe, improve its toughness. How to choose the protection device of CNC horizontal lathe? What to do if the temperature of CNC machine guide bearing is too high?

Shenyang First machine Tool Factory CNC lathe vibration in the process of processing, will cause the workpiece surface chatter, rework rate, reject rate is high, accompanied by shock knife phenomenon. 1, CNC lathe vibration is generally divided into three kinds: free vibration, forced vibration and self-excited vibration. Free vibration Free vibration is a vibration caused by an initial excitation, usually a pulse. This vibration depends on the initial excitation, one-time vibration energy, the process is limited, generally will not cause damage to the CNC lathe. Therefore, the influence of free vibration on CNC lathes is generally not considered. Forced vibration The object is in the vibration that produces below the external force action of lasting cycle change, call force vibration, be like the vibration that unbalanced, wrong place causes. Self-excited vibration Self-excited vibration is the vibration caused by the excitation caused by the system itself without external force. Self-excited vibration is a kind of dangerous vibration. Once the self-excited vibration occurs, the operation of equipment will lose stability. 2, numerical control lathe forced vibration causes and solutions The main reason (1) centrifugal force generated by the eccentric mass of rotating parts; (2) Transmission error of parts in the process of motion transmission; (3) Clearance characteristics in the cutting process. The solution (1) Reduce the excitation force. In order to improve assembly accuracy, the motor rotor, belt pulley and chuck should be tested for static balance. (2) Improve the stiffness and damping of the process system. Lathe system stiffness and system damping increase, can improve the resistance to vibration, also can reduce vibration. (3) Adjust the natural frequency of the system to avoid the generation of resonance. In the selection of speed, as far as possible to make the rotating workpiece frequency away from the machine tool related to the original natural frequency, to avoid the resonance zone. (4) Use shock absorbers or dampers. When the above methods do not work, consider using dampers or shock absorbers. 3. Causes and solutions of self-excited vibration of CNC lathe The reasons causing In the process of machining, the self-excited vibration is caused by the vibration process itself a periodic change in the cutting force, and by the periodic change of the cutting force, in turn to strengthen and maintain the vibration, is the vibration system to supplement the energy consumed by the damping effect. When the vibrating motion stops, the alternating force disappears. This self - excited vibration in metal cutting is generally called cutting chatter. In particular, the occurrence rate of self-excited vibration is much higher than that of forced vibration. The cutting relative vibration will reduce the surface quality of the machined workpiece and affect the service life of the tool and even the machine tool. In particular, now the use of a large number of high-precision CNC lathes, CNC lathes to ensure the accuracy of the workpiece and other indicators, will become meaningless when the flutter occurs. The solution (1) Select the right center height when installing the tool. When turning the inner hole groove, the tip point is theoretically required to be consistent with the center line of the hole, but in fact, when the tool is installed, the tip point is often on the center line 0.1mm or so, which is mainly the tool in the cutting, the tip point is often offset due to the reaction, so to give it a compensation amount. (2) as far as possible to shorten the extension of the tool bar to improve the rigidity of the tool. When the cutter rod is stressed, it will bend and cause vibration, and the longer the suspension length, the vibration will be intensified. In general, the length of the tool should not exceed 2-3 times the length of the tool bar, which can greatly improve the bending strength of the slender tool bar. (3) Reasonable selection of tool geometric parameters. The geometric parameters of the tool are: the tool Angle, the main Angle, the Angle and so on. The forward Angle has a great influence on vibration, and the vibration amplitude decreases with the increase of forward Angle. However, at higher cutting speed, the influence of rake Angle on vibration will be weakened. Therefore, when high speed cutting, even the use of negative rake tool, will not produce strong vibration. If the main deflection Angle increases, the cutting force will be reduced, and the cutting width will also be reduced. With the increase of the main deflection Angle, the vibration amplitude decreases gradually, but when the Angle is greater than 90°, the vibration amplitude increases. For the selection of rear Angle, it can be reduced to 2°~3°, and the vibration is obviously weakened. You can also grind out a negative inverted edge Angle on the main back corner of the tool, which can play a good role in eliminating energy. (4) Improve the vibration resistance of the workpiece system. Improving the vibration resistance of process system is one of the important measures to control and prevent self-excited vibration. In the process system, the workpiece system is often prone to vibration weak link, so it is very necessary to improve the vibration resistance of the workpiece system. How to choose the lubrication cutting fluid for turning and milling compound machine tool in use This paper analyzes the cause of tool collision fault of nc turning milling compound machine tool

When selecting the cutting fluid used in turning and milling compound machine tool, the customer can select 2 or 3 kinds of cutting fluid that has better comprehensive performance according to the processing situation of the enterprise itself, and determine the cutting fluid that meets the processing requirements and the price is appropriate after the actual trial. The performance of the workpiece material is very important to the choice of cutting fluid. Below, we will look at how to choose the lubrication cutting fluid of the turning and milling compound machine tool in use. 1, cutting fluid should have no irritating smell, do not contain harmful additives to human body, to ensure the safety of users. 2, cutting fluid should meet the requirements of equipment lubrication and protection management, that is, cutting fluid should not corrod the metal parts of the machine tool, do not harm the sealing parts and paint of the machine tool, and will not remain hard colloidal sediment on the guide rail of the machine tool, to ensure the safety and normal operation of the equipment. 3, turning and milling compound machine tool cutting fluid should meet the anti-rust requirements between the workpiece process, do not rust the workpiece. Such as processing copper alloy, should not choose the cutting fluid containing sulfur. When machining aluminum alloy, cutting fluid with neutral PH value should be selected. Cutting fluid with high load and low surface tension, and judged by cutting fluid experiment. 5, cutting fluid should have a long service life, which is particularly important for turning and milling compound machine tools. 6, turning and milling compound machine tool cutting fluid should try to adapt to a variety of processing methods and a variety of workpiece materials. 7, cutting fluid should be low pollution, and waste liquid treatment method. 8, cutting fluid should be cheap, easy to manufacture. In short, the selection principle of cutting fluid for turning and milling compound machine tool must meet the requirements of cutting performance and service performance, that is, it should have good lubrication, cooling, rust prevention and cleaning performance, in the process of processing can meet the technological requirements, reduce tool loss, reduce processing surface roughness, reduce power consumption, improve production efficiency. The stability of use should also be considered. Nc programming technology for turning and milling compound machine tool How to solve the vibration problem of CNC lathe

The development of machining technology of turn-milling compound machine tool has also put forward higher requirements for NC programming technology, which is also a bottleneck in the practical production and application of turn-milling compound machine tool. Compared with the traditional NUMERICAL control programming technology, the programming difficulties of turning and milling compound machining machine tools are mainly reflected in the following aspects. (1) Complex process types. For the process personnel, not only to be able to master CNC turning, multi-axis milling, drilling and other processing methods of programming, but also for the connection between the process and the way to accurately define the knife. Therefore, in nc programming, it is necessary to have an intuitive understanding of the process model and the distribution of machining allowance after the completion of the current process, so as to facilitate the programming of the next process and the setting of the back and forth knife. (2) the serial parallel sequence in the process of programming must be determined in strict accordance with the process route. Many parts can be completely processed from raw material to finished product when they are processed on the turn-milling complex machining center, so the results of the processing program must be consistent with the process route. At the same time, for multi - channel parallel machining also need to be considered in the process of NC machining programming. Therefore, in order to realize the high efficiency of composite machining, we should develop the process solution of process - programming - simulation integration. (3) Some functions of turning and milling compound machining machine tools are not supported by the current general CAM software. Compared with conventional single machine machining, the machine tool movement and machining functions of turning and milling composite machining are much more complex, and the current general CAM software is not enough to fully support the programming of these advanced functions, such as online measurement, sawing, automatic feeding, tailstock control, etc. Therefore, the program compiled by using general CAM software still needs a lot of manual or interactive ways to be applied to automatic turn-milling complex machining. (4) Integration of processing procedures. At present, the NC programs of general CAM software are independent of each other. In order to realize the automation and complete machining of turning and milling complex, it is necessary to integrate and integrate these independent machining programs. This integration must be guided by the process route of parts, first determine which programs are parallel, and then determine the processing sequence of different process methods, and give accurate tool change, card replacement, datum transformation and tool advance and retreat instructions. It can be seen that it is very difficult to make nc program for turning milling machine tool, and there are still many defects and deficiencies in the current general CAM software for turning milling machine tool. In order to make up for these deficiencies, it is a more realistic solution to develop a special programming system suitable for product process and composite processing equipment on the basis of existing general CAD/CAM software. On the one hand, it can reduce the repeated investment of software purchase, and at the same time, it can avoid the defects of process knowledge reuse and complex personnel allocation caused by the disunity of programming platform. Installation and commissioning of CNC lathe with inclined bed How to choose the lubrication cutting fluid for turning and milling compound machine tool in use