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Classification and positioning Benchmark of large mechanical processing, Nanjing Precision Engineering Co., ltd

by:NJPE     2020-02-17
Large-scale machining is mainly composed of several surfaces in the manufacturing process. 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 of large-scale machining the design benchmark of large-scale machining: the benchmark used to determine other points, lines, surfaces and positions on the part drawing is called the design benchmark, and its process benchmark: the benchmark used in the processing and assembly of parts is called the process benchmark. Process benchmarks are divided into assembly benchmarks, measurement benchmarks and positioning benchmarks according to different uses. Assembly benchmark for large-scale machining: the benchmark used to determine the position of parts in components or products during assembly is called Assembly benchmark. Measurement benchmark for large mechanical processing: the benchmark used to check the size and position of the machined surface is called measurement benchmark. Positioning datum for large-scale machining: 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. Precision and ultra-precision machining is an important component of its modern mechanical processing and manufacturing technology. When it is used, it is mainly one of the important indicators to measure the level of a country's high-tech manufacturing industry, with the development of computer and information technology, higher requirements are put forward for manufacturing technology, which requires not only extremely high size, shape and position accuracy, but also extremely high surface quality. It is under such market demand that ultra-precision machining technology has developed rapidly, and various technologies and new methods are constantly emerging.
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