1. Accurate workpiece size, poor surface finish

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

Solution: after the tool wear or damage is not sharp, then re-sharpen the knife or choose a better tool on the knife; The machine produces resonance or the position is not stable, adjusts the level, lays the foundation, the fixed is stable; The reason for mechanical crawling is that the guide rail of the towing plate is badly worn and the ball of the lead screw is worn or loose. The machine tool should be maintained carefully. The iron wire should be cleaned after work and lubricating oil should be added in time to reduce friction. Select the coolant suitable for workpiece processing, in the case of meeting the requirements of other processing procedures, try to choose a higher spindle speed.

2. The workpiece produces the phenomenon of taper size head

Failure reason: the machine tool placement level is not adjusted well, one high one low, resulting in unstable placement; When turning the long shaft, the contribution material is hard and the cutter is deep, which causes the phenomenon of letting the cutter. The tail thimble is not centered on the spindle.

Solution: Adjust the leveler of the machine tool, lay a solid foundation and fix the machine tool to improve its toughness; Choose reasonable process and appropriate cutting feed to avoid the tool under force; Adjust the tailstock.

3. The driver phase lamp is normal, and the workpiece size is large or small

Failure causes: The screw rod and bearing wear due to the long-term high-speed operation of the machine tool towing plate; The repeated positioning accuracy of the tool holder has deviation in long-term use. The pallet can be returned to the machining starting point accurately every time, but the size of the workpiece still changes. This phenomenon is generally caused by the spindle, spindle high-speed rotation makes the bearing wear seriously, resulting in machining dimension change.

Solution: use the dial indicator to rest on the bottom of the tool holder. At the same time, edit a fixed cycle program through the system to check the repeated positioning accuracy of the towing plate, adjust the 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; The dial indicator is used to check whether the processed workpiece is returned to the starting point of the program accurately. If possible, the spindle is repaired and the bearing replaced.

4. The size of the workpiece differs a few millimeters from the actual size, or there is a great change in a certain axial direction

Fault cause: The fast positioning speed is too fast, and the drive and motor can't respond; After long-term friction loss, mechanical towing plate screw and bearing become too tight and stuck; The tool holder is too loose after changing the tool, and the lock is not tight; Edit the program error, the head, tail did not echo or did not cancel the knife to fill the end; The electronic gear ratio or step Angle of the system is set incorrectly.

Solution: Fast positioning speed is too fast, then adjust the GO speed, cutting speed and time to make the driver and motor in the rated operating frequency under the normal work; If the towing plate and the screw crane bearing are too tightly stuck after the machine tool wear occurs, it must be adjusted and repaired again. If the tool holder is too loose after tool change, check whether the reversal time of the tool holder is satisfied, check whether the turbine worm inside the tool holder is worn, whether the clearance is too large, whether the installation is too loose, etc.; If it is caused by the program, it must modify the program, improve according to the requirements of the workpiece drawing, select a reasonable processing technology, and prepare the correct program according to the instructions in the manual. If it is found that the size deviation is too large, check whether the system parameters are set reasonably, especially whether the parameters such as electronic gear and step Angle are damaged. This phenomenon can be measured by the dial indicator.

5. Arc processing effect is not ideal, the size is not in place

Fault causes: vibration frequency overlap leads to resonance; Processing technology; The parameter setting is unreasonable, the feed speed is too large, the arc machining step is out of step; Loose lead screw caused by large gap or out of step caused by too tight lead screw; Synchronous belt wear

Solution: Find the part that produces resonance and change its frequency to avoid resonance; Consider the processing technology of the workpiece material, and make a reasonable program; For stepper motor, the processing rate F should not be set too high; Whether the machine is firmly installed and placed smoothly, whether the drag plate is too tight after wear, whether the clearance increases or the tool holder becomes loose, etc.; Replace the sync tape.