The accuracy of the profile machining center affects the processing quality, so the accuracy of the machining center, the industry has also been studying ways to reduce or eliminate the error. So how to determine the accuracy of a machining center? Let's talk about the following four aspects.
1. Vertical Machining Center Positioning of Test Specimens: The test specimen shall be located in the middle of the X stroke and placed along the Y and Z axes in the appropriate position for specimen and fixture positioning and tool length. When there are special requirements for the location of the test piece, it shall be stipulated in the agreement between the manufacturer and the user.
2. Specimen fixation: The specimen should be easy to install on the special fixture, in order to achieve the maximum stability of the tool and fixture. Fixture and specimen mounting surface should be straight.
The test piece mounting surface should be tested and the fixture clamping surface parallelism. Appropriate clamping methods should be used to allow the tool to penetrate and machine the full length of the center hole. It is recommended to use countersunk screws to secure the specimen to avoid interference between the tool and the screw. Alternatively, other equivalent methods may be used. The overall height of the test piece depends on the chosen method of fixing.
3. The material of the specimen, its cutting and cutting parameters: The material of the specimen and the cutting tools and cutting parameters should be 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: cast iron is about 50m / min; aluminum is about 300m / min.
2) Feed: about (0.05 ~ 0.10) mm / tooth.
3) Depth of cut: All milling processes should have a radial depth of cut of 0.2 mm.
4. The size of the test piece: If the test piece is cut several times, reducing the size and increasing the diameter of the test piece, it is recommended to select the size of the final contour test piece as specified in this standard when used for acceptance inspection so as to reflect truthfully Machining center cutting accuracy. Specimens may be used repeatedly in cutting tests and their specifications shall be maintained within 10% of the nominal size given in this standard. When the test specimen is used again, a thin layer of cutting should be performed to clean all the surfaces prior to performing the new precision test.