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The workpiece has a taper phenomenon

- Jun 11, 2018 -

The workpiece has a taper phenomenon

The cause of the problem is that the level of the machine tool has not been adjusted properly, and the height and position of the machine tool are not stable. When the long axis is turned, the dedication information is relatively hard, the tool is relatively deep and the knife is formed. The tailstock ejector pin and the spindle are not the same.

Solution: Use the level meter to adjust the level of the machine, lay a solid foundation, and fix the machine to improve its resistance; select a reasonable process and appropriate cutting feed to prevent the knife from being forced by the knife; adjust the tailstock.

Driver phase light is normal, and the workpiece size is large and small

The cause of the problem is that the machine tool is running at a high speed for a long time, which leads to wear of the screw rod and the bearing; the error in the repeated positioning accuracy of the tool holder occurs at a long time; the carriage can accurately return to the processing starting point each time, but the scale of the workpiece is still changed. . This phenomenon is generally caused by the spindle, the spindle's high-speed rolling makes the bearing wear and tear, resulting in changes in the processing scale. Metal processing WeChat, content is good, it is worth paying attention to.

Solution: Use the dial indicator to rest on the bottom of the knife holder, through a fixed cycle program corrected by the system, view the repeat positioning accuracy of the carriage, adjust the screw gap, replace the bearing; use the dial indicator to view the repeat positioning accuracy of the knife holder, Adjust the machine or replace the tool holder; use the dial indicator to check whether the workpiece is accurately returned to the starting point of the program. If it can, repair the spindle and replace the bearing.

The workpiece dimension is a few millimeters away from the actual dimension, or there is a large change in one axis

The cause of the problem is that the fast positioning speed is too fast, and the drive and motor response is not enough; after a long period of time, the mechanical dragging screw and the bearing are too tight; the tool rest is too loose after the tool change, and the lock is not tight; If the program is faulty, there is no response to the head or tail or if the tool compensation is not revoked; the electronic gear ratio or the step angle of the system is set to fault.

Solution: If the fast positioning speed is too fast, adjust the speed of GO properly, cutting acceleration and deceleration and timing so that the drive and the motor can operate normally at the extra operating frequency; the carriage and the screw crane bearing are too tight after the wear of the machine tool. If it is stuck, it is necessary to readjust the correction. If the tool rest is too loose after changing the tool, check whether the tool rest is in reverse. Check whether the worm inside the tool holder is worn, whether the clearance is too large, and whether the device is too loose. If the cause of the program is formed, it is necessary to amend the program, improve according to the requirements of the workpiece drawing, select a reasonable processing technology, and write the correct program according to the requirements of the instruction manual; if it is found that the scale error is too large, check whether the system parameters are set properly, especially the electronics. Whether the parameters such as gears and step angles are damaged, this phenomenon can be measured by dial gauges.

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