Definition and benchmark presentation machining
Machining definition:
Machining is a process of using the machinery of the dimensions of the workpiece or performance changes. Press is the temperature of the workpiece is in a state, is divided into cold and hot processing. Generally at room temperature processing, and does not cause the workpiece chemical or phase changes, called cold. Usually above or below the normal temperature of the process, it will cause a chemical or piece of phase change material, said thermal processing. Cold press processing methods can be divided into the difference between cutting and pressure processing. Thermal processing common with heat treatment, forging, casting and welding.
Machining reference
Mechanical parts is made up of several surface composition, the relative relationship between research parts of the surface, must determine a baseline, benchmarks are used to determine the other on the part of point, line, surface position is based on points, lines, polygons. Depending on the function reference, the reference design can be divided into two types of benchmarks and process benchmarks.
1. Design Basis
On other parts diagram for determining a reference point, line, surface location, called the design basis. Each design basis is cylindrical and the bore axis of the part, the end face A is an end B, C of the design basis, the reference axis of the bore is cylindrical runout.
2. Process Reference
Reference parts machining and assembly process used, called the process reference. Process benchmark is divided according to different uses assembling a benchmark to measure the reference and positioning reference.
(1) to increase the mechanical rack assembly mounting reference position is determined in part or parts of the reference product, called the assembly baseline.
(2) machining measurement reference for the survey has been processed size and position of the reference surface, called the measurement reference. The axis of the bore is cylindrical runout test measurement reference; A is the surface inspection length L dimension l and the measurement reference.
(3) machined workpiece positioning work positioning reference benchmarks used, known as positioning reference. As a positioning reference surface (or line, point), in the first step can only select raw rough surface, this positioning said rough reference surface. After each step, you can use the machined surface as a positioning reference Such positioning reference surface, said fine.
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