More research on the surface of the part of the relative relationship, it is necessary to determine a benchmark, the benchmark is used to determine the other part of the point, line, the position is based on the point, line, face.
According to the different functions of benchmark, composed of several surface precision machining parts
Standards can be divided into two categories, design data and technical data, the following is a detailed explanation.
Precision machining based parts design diagram is used to determine the benchmark of point, line, surface, referred to as the reference for the design.
Cylindrical shaft sleeve parts precision machining, and part of the inner hole design datum axis, the design of the end face is B, C, benchmark hole cylindrical shaft radial runout.
Process indicators used in the precision machining parts processing and assembly process benchmark, known as the benchmark process.
Benchmarking process is divided into different according to use assembly benchmark, measurement datum and location datum.
Assembly benchmark assembly (
Used to determine the position of the component or product component benchmark, known as assembly benchmark.
Measurement benchmark to complete the size and location of datum, referred to as the measuring datum.
As shown in figure 32 -
Shown in part 2, inner hole axis cylinder radial runout measurement benchmark, check the length L, measured on the surface of the benchmark.
Locating datum processing workpiece positioning base, known as the locating datum.
As the surface of the locating datum (
Or line and point)
, only the first step on the surface of the original, select blank positioning surface coarse benchmark.
As a locating datum in the surface of each process has been processed, adopting the precision positioning on the surface of the benchmark.
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