Mechanical design, hardness of the workpiece, how to determine, for example, in the drawings, technical requirements of the hardness value how to get?
Different material requirements are not the same, conditioning, surface quenching, carburizing, nitriding and so on, the requirements vary, to see the use of parts and precision requirements. May refer to "mechanical design manual".
If you are engaged in a kind of graduation design, go to the library and borrow some of the heavy tools for your design manual, mechanical, can get the corresponding information in the manual, manual information can be used as the basis,
1. the hardness of the workpiece should be determined to determine the hardness of the workpiece for the design according to the working conditions of the workpiece, such as linear bearings for the hard axis, because the shaft and ball contact stress, the equivalent of the bearing outer ring, so the hardness in 60-64HRC, which requires the use of accumulated experience, can also query the relevant information to obtain.2., because of the hardness requirements, so the need for reasonable material selection and heat treatment methods; or linear bearings used for hard shaft, it is necessary to choose the appropriate material Cr15, and the surface high-frequency quenching. Material can be used in the design manual to select materials, and heat treatment processes are required to refer to the Handbook of heat treatment processes.3., as designers, there is no need to be proficient in materials, knowledge, and heat treatment processes, but it should be understood that no mistakes should be made. For example, the choice of 2Cr13 as linear bearings with the hard shaft, that hardening is not to improve the hardness. Or choose the right material, but there is no corresponding heat treatment, the surface hardness is not guaranteed.
