In the design of process standards, ensuring the reasonable arrangement of part processing requirements and processing sequence is crucial for the correct selection of positioning data. CNC precision parts processing.

The positioning reference is divided into precision reference and coarse reference: the coarse reference uses the unprocessed surface on the blank as the positioning reference. The precision reference is based on the processed surface as the positioning reference.

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The selection criteria for precision benchmarks are 01.

(1) Benchmark overlap criterion: To prevent positioning errors caused by data misalignment, the surface design data after machining should be selected as much as possible.

(2) Consistent benchmark standards: In order to ensure the relative directional accuracy between machining appearances, the same set of precision benchmarks should be used as much as possible to process as many appearances on the workpiece.

(3) Cross reference standards for workpiece machining surfaces: Two repeated machining methods for machining surfaces can be used as cross references.

(4) Self benchmark standard: Some fine machining processes require small and uniform machining tolerances, usually based on the machining appearance itself.

The selection criteria for the four precision benchmarks mentioned above sometimes cannot be met simultaneously, and should be determined based on actual situations.

Selection criteria for coarse benchmarks.

(1) The rough reference should be used during the initial machining process of the workpiece. The correct selection of bold benchmarks is not only related to the processing of the starting process, but also has a significant impact on the entire workpiece process.

(2) Reasonably allocate machining tolerance standards: important appearance should be used as a rough benchmark, and uniform machining allowance should be adhered to for workpiece appearance. Non standard precision components.

(3) Easy to install clamping standard: In order to ensure stable positioning and secure installation of the workpiece, it is necessary to choose approximate reference points that are smooth, clean, free from lightning strikes, forged cuts or other notches or other defects as much as possible.