When it comes to cnc processing, there must be reasonable processing methods and processing steps, because these processes directly affect the processing quality, production efficiency and processing cost of cnc machined parts. Therefore, we have to reasonably do the following six steps for cnc processing:
Step 1: First rough and fine. For example, follow the order of roughing-semi-finishing-finishing, and gradually improve the machining accuracy. The roughing will cut off most of the machining allowance on the surface of the workpiece in a short period of time. In this way, on the one hand, the metal removal rate is increased, and on the other hand, the uniformity requirement of the finishing vehicle is satisfied. If the uniformity of the remaining amount after roughing the car does not meet the requirements of finishing, then a semi-finished car should be arranged to prepare for the finishing of the car. The finishing car should ensure the machining accuracy, and cut the contour of the part according to the size of the pattern;
Step 2: Before the near and far in the general case, the modern part of the cutting point is processed first, and the part of the cutting point is processed later to shorten the tool movement. Distance, reducing air travel time. For turning, it is beneficial to maintain the rigidity of the blank or semi-finished product and improve the cutting conditions.
Step 3: Internal and external cross-over principle, the parts that need to be processed on both the inner surface (inner cavity) and the outer surface are arranged. When processing the sequence, the inner and outer surfaces should be roughed first, and then the inner and outer surfaces should be finished. Never machine a part of the surface (outer or inner surface) of the part and then machine the other surface (inner or outer surface).
Step 4: The principle of the base plane priority should be given to the surface used as a fine reference. This is because the more precise the surface of the positioning reference, the smaller the clamping error. For example, when machining a shaft part, the center hole is usually machined first, and then the outer hole surface and the end surface are processed with the center hole as a fine reference;
Step 5: The principle of the first and second principles should first process the main working surface of the part and the assembly base surface. Early detection of major surfaces in the blank may present modern defects. The secondary surface can be interspersed, placed on the main processing surface to a certain extent, and before the final finishing;
Step 6: First face and back hole principle The plane profile size of the box and bracket parts is large, generally the plane is first processed. Rework holes and other dimensions. In this way, the processing sequence is arranged, and on the one hand, the processed plane is positioned, which is stable and reliable; on the other hand, it is easy to machine the hole in the processed plane, and the processing precision of the hole can be improved, especially when the hole is drilled, the axis of the hole is not easy. Partial.
Remarks: For some high-precision products that need to be oxidized, we also need to control the tolerances during processing so that the tolerances are correct after oxidation. AIXI Prototype service will always seek more new methods in this industry to find more Multi-processing high-precision, complex product solutions.