Processing parts on a machining center generally has multiple steps and multiple tools are used. Therefore, whether the processing sequence is reasonable or not directly affects the processing accuracy, processing efficiency, number of tools and economic benefits.
- (1) When arranging the processing sequence, the general process principles of “base surface first, surface first, hole first”, “main first then second” and “rough first then fine” should also be followed.
- (2) The choice of positioning datum directly affects the arrangement of the processing sequence, so the surface used as the positioning datum should be processed first.in order to provide a reliable positioning datum for processing other surfaces. Because the surface processed after the positioning datum is selected in this process may also be the positioning datum of the next step, so after the positioning datum of each processing step is determined, the entire finishing process can be pushed forward step by step from the final finishing step. The approximate sequence of the process.
- (3) When determining the processing sequence of the machining center, it is first necessary to clarify whether the parts need to be top-processed before processing. Top machining is often done by ordinary machine tools. If the precision of the blank is high, the positioning is more reliable, or the machining allowance is sufficient and uniform, it is not necessary to perform pre-processing, and directly process it on the machining center. At this time, it is necessary to report the accuracy of the rough rough reference to consider the division of the machining center process, which can be completed in one process or divided into several processes.
- (4) When machining parts on a machining center, the most difficult thing to guarantee is the size between the machined surface and the non-machined surface, which is the same as CNC milling. Therefore, even if the pattern requires a non-processed surface, an appropriate margin must be added to the non-processed surface when making the blank, so as to ensure that the size between the non-processed surface and the processed surface meets the requirements of the design when the machining center is processed. Similarly, if there is a size requirement between the pre-processed surface of the machining center and the surface processed by the machining center, a certain machining allowance should also be left during pre-processing. It is best to complete the pre-processing in one clamping of the machining center. All processing content including processing surface.