Machining a part on a machining center often involves multiple steps and the use of multiple tools. 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”, “primary first followed by”, and “coarse first and then fine” should also be followed.
(2) The selection of the positioning datum directly affects the arrangement of the processing sequence, so the surface used as the positioning datum should be processed first to provide a reliable positioning datum for the processing of other surfaces. Because the surface processed after the positioning reference is selected in this process may also be the positioning reference for the next step, after the positioning reference for each processing step is determined, the entire finishing process can be advanced step by step from the final step. Complete the steps. The approximate sequence of the process.
(3) When determining the machining sequence of the machining center, it is first necessary to clarify whether the parts need top machining before machining. Top machining is usually done by ordinary machine tools. If the precision of the blank is high, the positioning is relatively reliable, or the machining allowance is sufficiently uniform, it can be processed directly on the machining center without pretreatment. At this time, it is necessary to report the accuracy of rough reference to consider the division of machining center processes, which can be completed in one process or divided into several processes.
(4) When machining parts in 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-machined surface, an appropriate margin must be added to the non-machined surface when making the blank to ensure that the size between the non-machined surface and the machined surface meets the requirements. The design of machining center processing. Similarly, if there is a dimensional requirement between the pretreated surface of the machining center and the surface machined by the machining center, a certain machining allowance should also be left in the pretreatment. Pre-machining is best done in one setup on the machining center.