Classification requirements and processing quality of large-scale mechanical processing, Nanjing Precision Engineering Co., ltd
In the process of operation of large-scale mechanical processing, the designed process regulations should ensure the processing quality of machine parts, so as to meet various technical requirements when designing drawings, the technological process should have a higher productivity so that the products can be put on the market as soon as possible.
Large-scale mechanical processing tries to reduce manufacturing costs, pay attention to reducing the labor intensity of workers and ensure production safety.
Mechanical parts are composed of several surfaces. To study the relative relationship between the surfaces of parts, a benchmark must be determined, datum are the points, lines and faces on which the positions of other points, lines and faces are determined.
According to the different functions of the benchmark, the benchmark can be divided into two types: Design Benchmark and process benchmark. Classification requirements for large-scale machining 1.
Design Benchmark for large-scale machining: the benchmark used to determine the positions of other points, lines and surfaces on the part drawing is called Design benchmark. 2.
Process benchmark: the benchmark used in the processing and assembly of parts is called process benchmark.
Process benchmarks are divided into assembly benchmarks, measurement benchmarks and positioning benchmarks according to different uses. (1)
Assembly datum: the datum used to determine the position of parts in components or products during assembly is called Assembly datum. (2)
Measurement reference: The reference used to check the size and position of the machined surface is called measurement reference. (3)
Positioning datum: the datum used for workpiece positioning during machining is called positioning datum. The surface as the positioning reference (Or line, point)
In the first process, only the unprocessed blank surface can be selected. This kind of positioning surface is called coarse reference.
In the following processes, the machined surface can be used as the positioning reference, which is called the fine reference.
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