Machinery parts manufacturers said that since the emergence of machinery, there have been corresponding mechanical parts. But as a discipline, mechanical parts are separated from mechanical tectonics and mechanics. With the development of machinery industry and the emergence of new design theories and methods, new materials and new processes, mechanical parts have entered a new stage of development. The theories of finite element method, fracture mechanics, elastohydrodynamic lubrication, optimization design, reliability design, computer aided design (CAD), solid modeling (Pro, Ug, Solidworks, etc.), system analysis and design methodology have been gradually applied to the research and design of mechanical parts. It is an important trend for the development of this discipline to better realize the integration of multiple disciplines, realize the combination of macro and micro, explore new principles and structures, more use dynamic design and accurate design, more effective use of electronic computers, and further develop design theories and methods.
The surface roughness is an important technical index reflecting the micro geometric shape error of the part surface, and is the main basis for inspecting the part surface quality; Whether it is reasonable or not is directly related to the quality, service life and production cost of products. There are three methods to select the surface roughness of mechanical parts, namely, calculation method, test method and analogy method. In the design of mechanical parts, the most common method is analogy, which is simple, rapid and effective. The application of analogy requires sufficient reference materials, and various existing mechanical design manuals provide more comprehensive materials and documents. The most commonly used is the surface roughness corresponding to the tolerance class. In general, the smaller the dimensional tolerance requirement of mechanical parts is, the smaller the surface roughness value of mechanical parts is, but there is no fixed functional relationship between them. For example, the handle and handwheel on some machines and instruments, as well as the modified surface of some mechanical parts on sanitary equipment and food machinery, are required to be machined very smoothly, that is, the surface roughness is required to be very high, but the dimensional tolerance requirements are very low. In general, there is a certain correspondence between the tolerance grade and the surface roughness value of parts with dimensional tolerance requirements.
The above is the origin of mechanical parts explained by the mechanical parts processing manufacturer. I hope it will be helpful to you after reading
