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Benchmark requirements for the machining of precision machine parts
Aug 13, 2018

When analyzing the relative relationship of the surface of a mechanical part, it needs to be determined by a benchmark. Especially in the machining of precision mechanical parts, it is necessary to use this reference to determine the points, lines and faces on which the positions of other points, lines and faces are based. The machining benchmarks for precision machine parts can be divided into design criteria and process benchmarks.

 

An important process in the machining of precision mechanical parts is the design. At the time of design, it is necessary to determine the basis of other points, lines and surface positions, that is, the design basis, on the part drawing through the design basis. For example, precision machined bushing parts, the design basis of each outer circle and inner hole is the axial line of the part, the end face A is the design reference of the end faces B, C, and the axis of the inner hole is the reference of the radial runout of the outer circle.

 

In the machining of precision mechanical parts, the benchmark used in the machining process and assembly process is the process benchmark. Process benchmarks are divided into assembly benchmarks, measurement benchmarks, and positioning benchmarks depending on the application. The assembly basis is the basis for determining the position of the part in the part or product when the part is assembled. The measurement reference is a reference for verifying the size and position of the machined surface.

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