The problem of machining center accuracy is a daily problem that puzzles our machining operations, and the causes of accuracy errors are often difficult to investigate. Chenghai CNC has a professional technical team, which has been committed to the technological research and development of the machining center. For the repair of machining center accuracy error, we have sorted out nine symptoms and solved them. I believe we can solve the accuracy problem of machining center for you. Let's have a look！

The workpiece size is accurate and the surface finish is poor

Fault cause: the tool tip is damaged and not sharp; The machine tool resonates and is placed unsteadily; The machine tool crawls; Poor processing technology.

Solution: if the tool is not sharp after being worn or damaged, sharpen it again or select a better tool to set it again; If the machine tool resonates or is placed unsteadily, adjust the level, lay the foundation and fix it stably; The reason why the machine crawls is that the carriage guide rail is severely worn, and the lead screw and ball are worn or loose. The machine tool should be maintained carefully. After going to and from work, the iron wire should be cleaned and lubricated in time to reduce friction; Choose the coolant suitable for workpiece processing, and try to choose a higher spindle speed when it can meet the processing requirements of other processes.

The workpiece has large and small taper ends

Fault cause: the placement level of the machine tool is not adjusted well, one high and one low, resulting in unstable placement; When turning a long shaft, the contributing material is relatively hard, and the cutting tool is deep, resulting in the phenomenon of tool yield; The ejector pin of the tailstock is not concentric with the main shaft.

Solution: use a level to adjust the levelness of the machine tool, lay a solid foundation, fix the machine tool and improve its toughness; Choose a reasonable process and appropriate cutting feed to avoid the tool being forced to yield; Adjust the tailstock.

The phase light of the driver is normal, while the size of the workpiece processed is sometimes large and sometimes small

Fault cause: the carriage of the machine tool runs at high speed for a long time, resulting in the wear of the screw rod and bearing; The repeated positioning accuracy of the tool rest has deviation in long-term use; The carriage can accurately return to the processing starting point every time, but the size of the processed workpiece still changes. This phenomenon is generally caused by the spindle. The high-speed rotation of the spindle causes serious bearing wear, resulting in changes in machining dimensions.

Solution: use a dial indicator to lean against the bottom of the tool rest, and edit a fixed cycle program through the system to check the repeated positioning accuracy of the carriage, adjust the screw clearance, and replace the bearing; Check the repeated positioning accuracy of the tool rest with a dial indicator, adjust the machine or replace the tool rest; Use a dial indicator to check whether the processed workpiece returns to the starting point of the program accurately. If it is possible, overhaul the spindle and replace the bearing.

The size of the workpiece differs from the actual size by a few millimeters, or there is a great change in one axis

Fault cause: the speed of fast positioning is too fast, and the drive and motor cannot react; After long-term friction loss, the mechanical carriage screw and bearing are too tight and stuck; The knife rest is too loose and cannot be locked after changing the knife; The editing program is wrong, and the head and tail end are not echoed or the cutter compensation is not canceled; The electronic gear ratio or step angle of the system is set incorrectly.

Solution: if the fast positioning speed is too fast, adjust the speed of go, cutting speed and time to make the driver and motor work normally under the rated operating frequency; If the carriage and screw crane bearings are too tight and stuck after the wear of the machine tool, they must be readjusted and repaired; If the tool holder is too loose after tool change, check whether the reversing time of the tool holder is met, whether the worm and worm inside the tool holder are worn, whether the clearance is too large, whether the installation is too loose, etc; If it is caused by the program, you must modify the program, improve it 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 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. If this phenomenon occurs, it can be measured by playing a dial indicator.

Conclusion

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