Datum deviation compensation processing method and system for box or shell parts

Abstract

A benchmark deviation compensation type processing method used for a box or shell part comprises the steps as follows: firstly, the box or shell part is positioned and clamped on CNC (computer numerical control) machining equipment with a transition benchmark serving as a positioning benchmark; secondly, actual measurement distance values of a transition benchmark zero relative to a main positioning benchmark zero are detected, and difference values between each actual measurement distance value and a corresponding theoretical distance value are calculated respectively; thirdly, a coordinate value of the transition benchmark zero is corrected through the difference values to form a corrected transition benchmark zero; and fourthly, the corrected transition benchmark zero is taken as a workpiece coordinate system zero to process a to-be-processed structure on the box or shell part. Besides, the invention further provides a processing system used for realizing the processing method. According to the processing method and the processing system provided by the invention, actual deviation between the transition benchmark and the main positioning benchmark is compensated, so that an error of benchmark noncoincidence caused by the fact that the benchmarks are not unified in a processing process of the box or shell part is eliminated, and the processing quality of the part is improved.

Description

technical field [0001] The present invention relates to a processing method of a box or shell part, such as an engine block, in particular to a reference deviation compensation for a box or shell part during the processing of the box or shell part processing method. In addition, the present invention also relates to a datum deviation compensating processing system for box or shell parts for realizing the above processing method. Background technique [0002] In mechanical processing, it is often necessary to process box or shell parts, such as engine block, engine cylinder head, oil pan, crankcase, gear housing, etc. The processing of these parts generally has a general main positioning datum. In the process, the main positioning datum should be used as much as possible to position and clamp the box or shell parts, so that the positioning datum in the machining process can be kept uniform and the machining error can be reduced. However, in the process of processing box or ...

AI Technical Summary

Problems solved by technology

In the case of using the above-mentioned transitional datum as the positioning datum, due to the processing error of the transitional datum and the clamping error when using the transitional datum for positioning, there will inevitably be a deviation between the transitional datum and the main positioning datum, that is, the so-called inaccurate datum. Coincidence error, which will affect the processing accuracy of related processing items on the bottom surface of the engine block, resulting in low processing accuracy of the engine block, and even causing the engine block to become a waste product in severe cases

[0014] The above-mentioned defects in the machining process generally exist in the machining process of box or shell parts, and are not limited to the above-mentioned engine block

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