The arrangement of CNC machining sequence


The arrangement of CNC machining sequence

After you choosing the CNC machining method and dividing the process, the main content of the process route is to arrange these processing methods and processing procedures reasonably. The parts made by CNC machine usually includes cutting , heat treatment and auxiliary process (including surface treatment, cleaning and inspection, etc.). These processes affects the processing quality directly, production efficiency and cost of parts. Therefore, the sequence of cutting, heat treatment and auxiliary process should be properly arranged in the design of CNC processing route, and the problem of connection between the processes is solved.

CNC machining arrangement:

(1) coarse first,then Precision

For example, in accordance with the sequence of rough machining semi finishing machining and final precision machining, the machining accuracy is improved gradually. The rough Lathe will cut off most of the machining allowance on the work piece surface in a relatively short time. On the one hand, it improves the metal removal rate, and on the other hand, it meets the requirement of uniformity of finishing machining. If the uniformity of remaining allowance after rough machining can not meet the requirement of precision machining., we must arrange semi finishing machining to prepare for precision machining. To ensure the machining accuracy, the parts should be cut out according to the size of the drawing.

(2) closing distance machining first,then far distance machining

In general, the modern part of the tool point is machined first, and it is machined from the position of the point element in order to shorten the moving distance of the tool and reduce the time of the empty travel. For turning, it is advantageous to keep the rigidity of the blank or closing distance machining first,then far distance machining and improve the cutting conditions.

(3) the principle of intersecting

For parts with both inner surface (inner cavity) and external surface, the inner and outer surface should be machined first, and then the inner and outer surface machining. No part of the surface (outer surface or inner surface) can be machined before processing other surfaces (inner surface or outer surface).

(4) the principle of the base surface first

Priority should be given to the surface used as a fine reference. because the more precise the surface of the positioning datum, the smaller the clamping error. For example, when machining shaft parts, the center holes are usually machined first, and then the surface and end face of the outer garden are machined with the center hole as the benchmark.

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