1, the workpiece size is accurate, the surface finish is poor
The cause of the problem
Tool tip damaged, not sharp;
machine tool resonance, placement is not stable;
the machine tool crawls;
the processing technology is not good.
The solution
Tool wear or damage is not sharp, then re-sharpen the knife or choose a better tool to re-tool; machine resonance or placement is not stable, adjust the level, lay the foundation, fixed and stable; mechanical crawling causes drag board guide wear, ball screw wear or loose, saw industry machines should pay attention to maintenance, should clean the wire after work and work, and add lubricating oil in time to reduce friction; select coolant suitable for workpiece processing, in the case of meeting the processing requirements of other processes, as far as possible to choose a higher spindle speed.
2, workpiece taper size head phenomenon
The cause of the problem
The machine tool placement level is not adjusted well, one is high and one is low, resulting in unstable placement;
when turning the long shaft, the contribution of material is hard, the tool is deep, resulting in the phenomenon of letting the knife;
tailstock thimble is different from spindle.
Solution:
Use a level to adjust the levelness of the machine tool, lay a solid foundation, the machine tool fixed to improve its toughness; choose reasonable technology and appropriate cutting feed to avoid cutting tool force; adjust tailstock.
3, the driver phase lamp is normal, and the size of the workpiece is large or small.
The cause of the problem
Fast positioning speed is too fast, the drive and motor can not respond;
in the long-term friction loss after the mechanical drag plate screw and bearing too tight stuck;
the tool holder is too loose after the tool changes, and the lock is not tight;
edit the program error, head, tail no echo or cancel the end of the knife;
the electronic gear ratio or step angle of the system is incorrectly set.
Solution:
If the fast positioning speed is too fast, the speed of GO should be adjusted appropriately, and the cutting speed and time should be adjusted to make the driver and motor work normally under the rated operating frequency. In the machine tool wear produced after the drag plate, screw crane bearing is too tight stuck, it must be readjust repaired; if the tool rest is too loose after tool change, check whether the tool rest reversal time is met, check whether the worm inside the tool rest is worn, whether the gap is too large, whether the installation is too loose, etc. If it is caused by the program, it must modify the program, improve in accordance with the workpiece drawings, choose a reasonable processing technology, in accordance with the instructions of the instruction manual to write the correct program; if the size deviation is too large, check whether the system parameters are set properly, especially whether the parameters such as electronic gear and step Angle are damaged. This phenomenon can be measured by making a dial indicator.
4, the size of the workpiece and the actual size of a few millimeters, or a great change in the axial direction
The cause of the problem
Fast positioning speed is too fast, the drive and motor can not respond;
in the long-term friction loss after the mechanical drag plate screw and bearing too tight stuck;
the tool holder is too loose after the tool changes, and the lock is not tight;
edit the program error, head, tail no echo or cancel the end of the knife;
the electronic gear ratio or step angle of the system is incorrectly set.
Solution:
If the fast positioning speed is too fast, the speed of GO should be adjusted appropriately, and the cutting speed and time should be adjusted to make the driver and motor work normally under the rated operating frequency. In the machine tool wear produced after the drag plate, screw crane bearing is too tight stuck, it must be readjust repaired; if the tool rest is too loose after tool change, check whether the tool rest reversal time is met, check whether the worm inside the tool rest is worn, whether the gap is too large, whether the installation is too loose, etc. If it is caused by the program, it must modify the program, improve in accordance with the workpiece drawings, choose a reasonable processing technology, in accordance with the instructions of the instruction manual to write the correct program; if the size deviation is too large, check whether the system parameters are set properly, especially whether the parameters such as electronic gear and step Angle are damaged. This phenomenon can be measured by making a dial indicator.
5, the effect of arc processing is not ideal, the size is not in place
The cause of the problem
The overlap of vibration frequencies leads to resonance;
unreasonable parameter setting and excessive feed speed make arc machining out of step;
loose screw clearance caused by large or screw too tight caused by out of step, synchronous belt wear.
Solution:
Find out the resonant parts, change their frequency, to avoid resonance; consider the workpiece material processing technology, reasonable programming; for stepper motor, processing rate F can not be set too large; whether the machine is firmly installed, placed smoothly, whether the drag plate is too tight after wear, clearance increases or tool rest loosens; replace the timing belt.
6. In batch production, workpiece out-of-tolerance occasionally occurs
The cause of the problem
The fixture must be carefully checked, and considering the operator's operation method, and the reliability of clamping, due to the size change caused by clamping, must improve the fixture so that workers as far as possible to avoid human negligence to make misjudgment phenomenon;
numerical control system may be affected by the fluctuation of external power supply or interference after automatic interference pulse, to drive the drive to accept excess pulse drive motor to take away or less phenomenon.
Solution:
Grasp its rule, try to use some anti-jamming measures, such as: strong electric field disturbance of high voltage cables and weak current signal of signal isolation, join the absorption capacity of anti-interference and a shielding wire isolation, in addition, check whether the ground wire connection is firm, grounding contact recently, all anti-interference measures should be taken to prevent the system disturbance.
7, a certain process of the workpiece processing changes, the size of other processes is accurate
The cause of the problem
Whether the parameters of the program segment are reasonable, whether they are in the predetermined trajectory, and whether the programming format meets the requirements of the specification.
Solution:
Thread program segment appear disorderly teeth, the pitch is not correct, then immediately associated with the processing of thread peripheral configuration (encoder) and the objective factors of the function.
8, each process of the workpiece has the phenomenon of increasing or decreasing
The cause of the problem
Programming errors;
system parameters are improperly set.
Improper configuration Settings;
mechanical transmission parts have regular periodic changes of failure.
The solution
To check whether the instructions used by the program are executed according to the requirements specified in the instruction manual, you can judge by making a dial indicator. The dial indicator is positioned at the starting point of the program so that the drag board returns to the starting point after the program ends, and then repeats the execution even if the results are observed and the rules are mastered; check whether the system parameters are set properly or are considered to be changed. Whether the single calculation meets the requirements and the pulse equivalent is accurate in the connection calculation coupling parameters of the relevant machine configuration; check whether the transmission part of the machine tool is damaged, whether the gear coupling is uniform, check whether there is a periodical, regular fault phenomenon, if there is, check its key part and give elimination.
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