Processing classification and positioning reference for large precision machinery processing plants

Large - scale machining, in manufacturing mainly by a few surface.In order to investigate the relative relationship between the surface of the components, a reference level is required.A reference point is a point, line, or plane that determines the position of other points, lines, or planes.According to the different functions of standards, standards can be divided into design standards and process standards.Large machining classification and large machining design benchmark: determine the other points on the part drawing, auto parts line, surface and position of the benchmark known as the design standard, the technical benchmark is the part assembly process of the benchmark.Ts is called a processing benchmark.Technical reference can be divided into assembly standard, measurement standard and position standard according to the purpose.Assembly criteria for large-scale machining: during assembly, the criteria for determining the position of parts or parts in a product are called assembly criteria.Large machining measurement standard: the standard to check the size and position of the machined surface is called the measurement benchmark.Large machining position datum: the datum which locates workpiece in machining is called position datum.Locating the reference surface (or line or point) can only be selected as a rough surface in the first step.The locating surface is called coarse datum.In the following procedures, the processing surface can be used as the positioning datum, and the hexagon punch rod will be called the precision datum.Precision ultra-precision machining is an important part of modern machinery manufacturing technology.When used, it is mainly one of the important indicators to measure a country's high-tech manufacturing level.With the development of computer and information technology, people put forward higher requirements on manufacturing technology, instead of just using manufacturing technology.For extremely high size, shape and position accuracy, and for extremely high surface quality.It is in this market demand, ultra-precision machining technology has been rapidly developed, the whole head die various processes and new methods emerge in endlessly.