The method of improving the precision of machining precision by CNC lathe
In the machining cnter, the machining of CNC lathes generally requires the use of multiple tools, so we must organize the processing order reasonably, which is conducive to improve machining accuracy, processing efficiency and economic benefits.
1. When organizing the processing sequence of CNC lathes, the same general guidelines for "basis first", "first face back hole", "first master second" and "first coarse and fine" should be followed.
2. The selection of the positioning reference directly affects the organization of the processing order. The surface as the positioning reference should be processed first to provide a firm positioning reference for processing other surfaces. Because the surface of the process is selected after the positioning reference is selected, it may be the positioning standard of the next process. Therefore, after the positioning reference of each processing step is determined, the entire process can be pushed forward from the final finishing process. Approximate order.
3. When determining the processing sequence of the CNC lathe, it is also necessary to first determine whether the part is to be pre-processed before processing. Pre-processing is often completed by a general machine tool. If the blank has high precision, the positioning is relatively firm, or the machining allowance is abundant and uniform, it can be processed directly on the machining center without pre-machining. At this time, it is necessary to consider the division of the machining center process according to the accuracy of the blank rough reference, so that it can be completed in one process or a few processes.
4. When machining parts on CNC lathes, the most difficult to ensure is the dimension between the machined and non-machined faces, which is the same as CNC milling. Therefore, even if the correct orthodontic surface is required for the pattern, it is necessary to add an appropriate margin to the non-machined surface when the blank is produced, so as to ensure the dimensional fit between the non-machined surface and the machined surface when processing the machining center. Similarly, if there is a scale requirement between the pre-machined surface before machining of the CNC lathe and the surface processed by the machining center, a certain machining allowance should be left in the pre-machining, preferably in the one-time clamping of the machining center. All processing contents including pre-machined surfaces.