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Principles of cnc parts machining customization

In the field of mechanical machining, the main content of the process route is to rationally arrange these machining methods and the order of the machining procedures after the CNC parts machining methods and procedures are divided. The CNC parts machinin


In the field of mechanical machining, the main content of the process route is to rationally arrange these machining methods and the order of the machining procedures after the CNC parts machining methods and procedures are divided. The CNC parts machining procedures of mechanical parts usually include cutting procedures, heat treatment procedures and auxiliary procedures (including surface treatment, cleaning and inspection, etc.). The sequence of these processes directly affects the machining quality, production efficiency and machining cost of the parts. Therefore, when designing the machining route of cnc parts, the order of cutting, heat treatment and auxiliary procedures should be arranged reasonably, and the connection problem between the procedures should be solved. To

Arrangement of cnc parts machining process:

(1) First rough and then refined

For example, follow the order of rough turning-semi-finish turning-finishing turning to gradually improve the machining accuracy. Rough turning will cut most of the machining allowance on the surface of the workpiece (the part shown in the cool dotted line as shown in Figure 2-4) in a short time. This improves the metal removal rate on the one hand, and on the other hand satisfies the uniformity requirements of the precision turning. If the uniformity of the margin left after rough turning cannot meet the requirements of finishing, semi-finishing turning should be arranged to prepare for finishing. The precision turning must ensure the machining accuracy, and the contour of the part is cut out according to the size of the drawing. To

(2) Near first, then far
In general, the modern parts away from the tool setting point are processed first, and the parts away from the tool setting point are processed later in order to shorten the tool movement distance and reduce the idle travel time. For turning, it is beneficial to maintain the rigidity of the blank or semi-finished product and improve its cutting conditions.
(3) Principle of crossover between inside and outside
For parts that have both an inner surface (inner cavity) and an outer surface to be processed, when arranging the machining sequence, the inner and outer surfaces should be roughed first, and then the inner and outer surfaces should be finished. Do not process a part of the surface (outer surface or inner surface) of the part before machining other surfaces (inner surface or outer surface).
cnc parts machining
(4) Basic principle first
Priority should be given to machining surfaces used as precision benchmarks. This is because the more accurate the surface of the positioning reference, the smaller the clamping error. For example, when machining shaft parts, the center hole is usually processed first, and then the outer surface and the end surface are processed on the center hole as a fine reference.

(5) The principle of first and second

The main working surface and assembly base surface of the part should be processed first, so that modern defects may be found on the main surface of the blank as early as possible. The secondary surface can be interspersed and carried out after the main machining surface has been processed to a certain degree and before the final finishing.

(6) The principle of face first, hole second

The plane outline size of the box body and bracket parts is relatively large. Generally, the plane is processed first, and then the holes and other dimensions are processed. Arranging the machining sequence in this way, on the one hand, it is stable and reliable with the machined plane positioning; on the other hand, it is easy to machine holes on the machined plane and can improve the machining accuracy of the holes, especially when the axis of the hole is not easy when drilling. Partial.


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