Application of cold deformation performance of three types of fasteners

1. Such as gaskets: first understand which type it is. If the product produced does not require heat treatment, it can reach the hardness requirement through a certain rolling refrigeration hardening. That is the relationship between the selected specifications and the rolling volume. Such as flat pads above 140HV, combined wave spring pads, elastic pads, etc. (Guide: Knowledge of Fasteners: Important Characteristics of Gasket Seals)

2. Such as bolts: can the performance be directly achieved by cold heading if the performance is below 6.8, which must be hardened by cold work, but the amount of compression must reach a certain amount, otherwise it will not be achieved, this It involves determining the total deformation of work hardening.

3. Austenitic stainless steel fasteners: The strength and hardness of this kind of fasteners are mainly realized by cold work hardening, and its cold work hardening is also directly related to its deformation. How to predict the strength and hardness is also what everyone wants understand. There is a concept of total deformation here: total deformation refers to carbon steel or stainless steel materials, after proper heat treatment to restore the plasticity of the material, through wire drawing (or rolling) and cold heading (including shrinking rod extrusion) The sum of the various deformations. If there is no shrink rod for rod-like parts, the hardness and strength of the rod before cold heading must reach a certain value in advance, otherwise the strength requirements will be difficult to achieve. When drawing or cold heading, it is necessary to fully consider the state of the raw material, whether it is tempered material, normalized material, or non-tempered material. If the hardness is too high after drawing, it is not suitable for cold forming, so overall consideration must be given to it.

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