How to check the accuracy of vertical machining center?

The problem of precision inspection of vertical machining centers during operation is very important, and it will directly affect the standard of our manufactured parts.

1. In the positioning of the test piece, the test piece should be located in the middle of the X stroke and placed along the Y and Z axes at an appropriate position suitable for the positioning of the test piece and fixture and the length of the tool. When there are special requirements for the positioning position of the test piece, it should be specified in the agreement between the manufacturer and the user.

2. The fixed specimen of the test piece should be easily installed on a special fixture to achieve the maximum stability of the tool and fixture. The mounting surface of the fixture should be flat and straight. The parallelism between the mounting surface of the test piece and the clamping surface of the fixture shall be checked. A suitable clamping method should be used to allow the tool to penetrate and machine the full length of the center hole. It is recommended to use a countersunk screw to fix the specimen to avoid interference between the tool and the screw, and other equivalent methods can also be used. The overall height of the test piece depends on the fixing method chosen.

3. The material, tool and cutting parameters of the test piece are selected according to the agreement between the manufacturer and the user, and should be recorded. The recommended cutting parameters are as follows:

Cutting speed: about 50m/min for cast iron and about 300m/min for aluminum

Feed rate: about (0.05~0.10) mm/tooth

Depth of cut: All milling operations should have a radial depth of cut of 0.2mm

4. The size of the test piece If the test piece is cut several times, the external dimension is reduced, and the hole diameter is increased. When it is used for acceptance inspection, it is recommended to select the final contour processing test piece size consistent with that specified in this standard, so as to truthfully reflect the machine tool cutting accuracy. Specimens may be used repeatedly in cutting tests, and their specifications should be kept within plus or minus 10% of the characteristic dimensions given in this standard. When the specimen is reused, a thin cut shall be made to clean all surfaces before a new finish test is performed.

Fagor Technology Co., Ltd. is a professional supplier specializing in the production, testing and sales of high-quality, high-precision CNC machine tools. Vertical machining centers are one of our products. Welcome to visit the website or contact us at any time.