special machine for servo gate valve The size is unstable? You may have these problems. Xiaobian summed up the nine major solutions today, the problem of machine tool size instability need not ask people!

1, the workpiece size is accurate, the surface finish is poor

Fault cause: the tool tip is damaged, not sharp; The machine tool resonates and is not placed smoothly; Machine tool crawling phenomenon; The processing technology is not good.

Solution: The tool is not sharp after wear or damage, then re-sharpen the tool or choose a better tool to re-set the tool; Machine tool resonance or placement is not stable, adjust the level, lay the foundation, fixed and stable; The reason for mechanical crawling is that the guide rail of the drag plate is badly worn, the ball of the lead screw is worn or loose, the machine tool should pay attention to maintenance, the wire should be cleaned after commuting, and the lubricating oil should be added in time to reduce friction; Choose the coolant suitable for workpiece processing, and choose a higher spindle speed as far as possible when it can meet the processing requirements of other processes.

2, the workpiece produces taper size head phenomenon

Fault cause: the level of machine tool placement is not adjusted well, one high and one low, resulting in uneven placement; When turning a long shaft, the contributing material is hard and the cutting tool is deep, resulting in the phenomenon of letting the knife. Tail seat thimble and spindle different center.

Solution: Use the level to adjust the levelness of the machine tool, lay a solid foundation, fix the machine tool to improve its toughness; Choose reasonable technology and appropriate cutting feed to avoid cutting tool force. Adjust the tailstock.

3, the driver phase light is normal, and the size of the workpiece processed is large and small

The cause of the failure: the long-term high-speed operation of the machine tool drag plate, resulting in screw and bearing wear; The repeated positioning accuracy of the tool holder deviates during long-term use. The drag plate can accurately return to the starting point of processing every time, but the size of the machined workpiece still changes. This phenomenon is generally caused by the spindle, the high-speed rotation of the spindle makes the bearing wear seriously, resulting in the change of processing size. Metal processing wechat, the content is good, worthy of attention.

Solution: Use the dial indicator to lean on the bottom of the tool holder, and edit a fixed cycle program through the system to check the repeated positioning accuracy of the drag plate, adjust the lead screw clearance, and replace the bearing; Check the repeated positioning accuracy of the tool holder with a dial indicator, adjust the machine or replace the tool holder; Use a dial indicator to check whether the workpiece is accurately returned to the program starting point, if possible, then overhaul the spindle and replace the bearing.

4, the workpiece size and the actual size of a few millimeters, or a great change in the axis

The cause of the failure: the speed of rapid positioning is too fast, and the drive and motor cannot respond; The mechanical drag rod and bearing are too tight after long-term friction loss; The tool holder is too loose after changing the tool, and the lock is not tight; Edit the program error, the head and tail did not echo or did not cancel the knife to finish; The electronic gear ratio or step Angle of the system is set incorrectly.

Solution: Fast positioning speed is too fast, then adjust the speed of GO properly, cutting speed and time to make the drive and motor work normally at the rated operating frequency; After the wear of the machine tool, the drag plate and the lead screw crane bearings are too tight, which must be readjust and repaired; If the tool holder is too loose after changing the tool holder, check whether the reverse time of the tool holder is satisfied, check whether the turbo worm inside the tool holder is worn, whether the clearance is too large, and whether the installation is too loose. If it is caused by the program, it is necessary to modify the program, improve according to the requirements of the workpiece drawing, select a reasonable processing technology, and write the correct program according to the instructions of the manual; If the size deviation is found to be too large, check whether the system parameters are set reasonably, especially whether the parameters such as electronic gear and step Angle are damaged, which can be measured by the dial indicator.

5, the effect of processing arc is not ideal, the size is not in place

Fault cause: vibration frequency overlap leads to resonance; Processing technology; The parameter setting is not reasonable, the feed speed is too large, so that the arc machining is out of step; Loose caused by large lead screw clearance or out of step caused by too tight lead screw; Synchronization belt wear.

Solution: Find out the resonant parts and change their frequencies to avoid resonance; Considering the processing technology of the workpiece material, reasonable programming; For the stepper motor, the processing rate F can not be set too large; Whether the machine tool is installed firmly, placed smoothly, whether the drag plate is too tight after wear, the gap increases or the tool holder is loose; Replace the synchronization belt. Metal processing wechat, the content is good, worthy of attention.

6. In mass production, the workpiece is occasionally out of whack

The cause of the failure: the fixture must be carefully checked, and considering the operator's operation method, and the reliability of the clamping, due to the size change caused by the clamping, it is necessary to improve the tooling so that workers avoid human negligence to make misjudgments; special machine for servo gate valve system may be subject to fluctuations of external power supply or interference automatically generate interference pulse, which is transmitted to the drive, causing the drive to accept excess pulse drive motor away or less walk phenomenon.

Solution: Understand and master its law, try to use some anti-interference measures, such as: strong electric field interference of strong cable and weak signal signal line isolation, add anti-interference absorption capacitor and shield line isolation, in addition, check whether the ground wire is firmly connected, grounding contact is close, take all anti-interference measures to avoid system interference.

7, a process of the workpiece processing changes, the other processes are accurate size

Failure cause: Whether the parameters of the program segment are reasonable, whether they are within the predetermined trajectory, and whether the programming format meets the requirements of the specification

Solution: When threading the program segment, there is a mess and the pitch is wrong, and it is immediately associated with the peripheral configuration of the thread processing (encoder) and the objective factors of the function.

8, each process of the workpiece has an increasing or decreasing phenomenon

Fault cause: program writing error; The system parameters are set improperly. Improper configuration Settings; Mechanical transmission components have regular periodic changes in failure

Solution: Check whether the instructions used by the program are executed according to the requirements of the manual, which can be judged by hitting the dial indicator, positioning the dial indicator at the starting point of the program, and whether the drag board returns to the starting point after the program is finished, and then repeating the execution even if the results are observed and the law is mastered; Check whether the system parameters are set properly or are considered to be changed; Whether the calculation of the coupling parameters of the relevant machine tool configuration meets the requirements and whether the pulse equivalent is accurate; Check whether the transmission part of the machine tool is damaged, whether the gear coupling is uniform, check whether there is a periodic, regular fault phenomenon, if there is, check its key parts and give the elimination.

9. The size change caused by the system is unstable

Fault cause: The system parameters are set improperly. The operating voltage is unstable; The system is affected by external interference, resulting in the system out of step; Capacitors have been added, but the impedance between the system and the driver does not match, resulting in the loss of useful signals; Signal transmission between the system and the driver is abnormal; The system is damaged or faulty.

Solution: speed, acceleration time is too large, spindle speed, cutting speed is reasonable, whether the operator's parameter modification causes the system performance to change; Install pressure stabilizing equipment; Make sure that the grounding wire is reliably connected, and add anti-interference absorption capacitance at the driver pulse output contact; Select the appropriate capacitor type; Check whether the signal connection line between the system and the driver is shielded, whether the connection is reliable, and whether the system pulse signal is lost or increased; Send to factory for repair or replacement of motherboard.

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