What are the strength requirements of channel steel punching machine for parts? I'd like to introduce the strength requirements of pipe punching machine to parts. When the parts of channel steel punching machine work, under the rated working conditions, they will neither produce any form of damage nor produce residual deformation beyond the allowable limit, and can ensure the normal operation and work of the machine, it is considered that the parts meet the strength requirements. Insufficient strength is the direct cause of fracture or excessive residual deformation of parts in operation. The strength of parts is divided into volume strength and surface contact strength. For example, under the action of load, if the stress produced by the parts of channel steel punching machine is in a large volume, then the strength of the parts under this stress state is called volume strength (referred to as strength). If two parts change from point contact or line contact to small surface area contact before and after loading, and the surface of the two parts produces large local stress (called contact stress), then the strength of parts is called surface contact strength (referred to as contact strength). < P style = "text indent: 2em;" > in design, most important parts are checked by strength conditions (related strength theory in Engineering Mechanics), except that some parts with small force or complex shape can not be determined by experience and experiment. If the strength of the part is not enough, it will lose its working capacity due to the failure of the whole fracture, surface contact fatigue or plastic deformation, so the design of the parts must meet the strength requirements.