What are the basic requirements for the design of mechanical parts?
(1) to avoid the requirement of failure in the scheduled life period1. strengthThe residual parts in the work break or do not allow the deformation of insufficient strength of subordination. The above failure forms shall be avoided for any part other than those intended for timely destruction in the safety device. Therefore, the proper strength is the basic condition that must be satisfied when designing a part.
2. stiffnessThe elastic deformation of a component at work does not exceed the allowable limit. This is called the stiffness requirement. Obviously, only when the elastic deformation is too large to affect the working performance of the machine, it is necessary to meet this requirement. For this kind of parts, besides the strength calculation, the stiffness calculation must be done.
In order to improve the strength of mechanical parts, the following measures can be adopted in principle at design time:Adopt a material of high strength;Make the part have enough sectional size;The sectional shape of a part is properly designed to increase the moment of inertia of the cross section;The mechanical properties of the material were improved by heat treatment and chemical heat treatment;Improve the manufacturing accuracy of moving parts to reduce the dynamic load at work;Reasonable allocation of parts of the machine in order to reduce the impact on the parts of the load.
