Mechanical parts processing is made up of several surface!

by:NJPE     2020-07-08
Mechanical parts processing is made up of several surface! Release date: 2019 08 - 19 21:49:28

mechanical parts is composed of several surface, studies the relative relations on the surface of the parts, must determine a benchmark, the benchmark is used to determine other parts of dot, line, the position is based on dot, line, face. According to the different function of the benchmark, the benchmark can be divided into two categories, design datum and technology datum. Classification of

design basis: on the part drawing to determine other benchmark point, line, face, referred to as the design reference. Benchmark:

process parts used in the process of processing and assembling of the benchmark, known as benchmark process. Process benchmarking is divided into different according to the use assembly datum, measurement datum and position datum.

( 1) Assembly benchmark: assembly when used to determine the components in the component or product in the location of the benchmark, known as assembly benchmark.

( 2) Measurement benchmark: to test finished surface size and position of the benchmark, referred to as the measuring datum.

( 3) Locating datum: when precision machining workpiece positioning the benchmark, called the locating datum. As the surface of the locating datum ( Or line and point) , only the first step in choosing raw surface of the blank, the positioning surface of said crude benchmark. In each working procedure has been machined surface can be adopted as a locating datum, the positioning surface of the said fine benchmark.

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