Large mechanical processing in the operating process, the design procedure should be able to guarantee the quality of the machine parts, so that you can meet the design pattern, as a ghost to the technical requirements, should make the process has high productivity, make the product to the market as soon as possible.
Large mechanical processing to reduce the manufacturing cost, pay attention to reduce the labor intensity of workers, to ensure the safety production.
Mechanical parts are made up 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.
The classification of the large mechanical processing requirements 1.
The design of large mechanical processing benchmark: on the part drawing to determine other benchmark point, line, face, referred to as the design reference.
Process benchmarking: parts used in the process of processing and assembling of benchmark, known as benchmark process.
Process benchmarking is divided into different according to the use assembly datum, measurement datum and position datum.
Assembly benchmark: assembly when used to determine the components in the component or product in the location of the benchmark, known as assembly benchmark.
Measurement benchmark: to test finished surface size and position of the benchmark, referred to as the measuring datum.
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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