[Precision Machinery Manufacturing] How to check the accuracy of the machining center?

(I) Positioning of the test piece The test piece shall be located at the middle position of the X stroke, and placed along the Y and Z axes at appropriate positions suitable for the positioning of the test piece and fixture and the length of the tool. When there are special requirements for the location of the test piece, it should be specified in the agreement between the manufacturer and the user.

二 (2) The fixed 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 and the test piece should be straight. The parallelism of the mounting surface of the test piece and the clamping surface of the fixture shall be checked. Appropriate clamping methods should be used so that the tool can penetrate and machine the entire length of the center hole. It is recommended to use countersunk screws to fix the test piece to avoid interference between the tool and the screw. Other equivalent methods can also be used. The total height of the test piece depends on the chosen fixing method.

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

1. Cutting speed: about 50m / min for cast iron parts; about 300m / min for aluminum parts.

2. Feed: about (0.05 ~ 0.10) mm / tooth.

3. Cutting depth: The radial cutting depth of all milling processes should be 0.2mm.

(IV) The size of the test piece If the test piece is cut several times, the overall size is reduced, and the hole diameter is increased. When used for acceptance inspection, it is recommended to use the final profiled test piece size consistent with that specified in this standard in order to be truthful. Reflects the cutting accuracy of the machine. The test piece can be repeatedly used in cutting tests, and its specifications should be kept within 10% of the characteristic size taxis given in this standard. When the test piece is used again, a thin layer cutting should be performed to clean all surfaces before performing a new fine-cut test.

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