As a skilled operator, you must understand the requirements of processing parts, process route, machine characteristics before you can operate the machine to complete the processing tasks. Operation points:
1) In order to simplify the positioning and installation, each positioning surface of the fixture should have accurate coordinate dimensions relative to the machining origin of the machining center.
2) In order to ensure that the orientation of the parts is consistent with the orientation of the workpiece coordinate system and the machine coordinate system selected in the programming, and the directional installation.
3) After a short time of disassembly, it can be changed into a fixture suitable for new workpiece. As the auxiliary time of machining center has been compressed very short, the loading and unloading of supporting fixture can not take up too much time.
4) The fixture should have as few components as possible and high stiffness.
5) The fixture should be open as far as possible, the space position of the clamping element can be low as possible, and the installation fixture should not interfere with the tool path of the working step.
6) Ensure that the processing content of the workpiece is completed within the stroke range of the spindle.
7) For the machining center with interactive worktable, due to the movement, up support, down support and rotation of worktable, the fixture design must prevent the space interference between fixture and machine tool.
8) Try to finish all the processing contents in one clamping. When it is not necessary to replace the clamping point, special attention should be paid not to damage the positioning accuracy due to replacing the clamping point. If necessary, it should be explained in the process documents.
9) For the contact between the bottom surface of the fixture and the worktable, the flatness of the bottom surface of the fixture must be within 0.01-0.02MM, and the surface roughness shall not be greater than ra3.2um.
ken.tang@chengcg.com
About the author