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Cold deformation performance application of three types of fasteners

2019-03-04

1. Gaskets: First understand what kind of products are specific. If the products produced do not need to be heat treated, the hardness requirements can be achieved by a certain rolling and cooling, that is, the selected specifications and the amount of rolling. The problem is. For example, a flat pad pattern of 140 HV or more, a wave spring pad pattern, an elastic pad pattern, and the like.

    2. Bolts: The performance is below 6.8. It can be directly achieved by the cold heading process. It needs to be hardened by cold work, and the amount of compression should reach a certain value, which involves the total deformation of cold work hardening.

    3. Austenitic type: The strength and hardness of these fasteners are mainly achieved by the cold work hardening process. Its cold work hardening is also related to its deformation. How to predict the strength and hardness of the product is also what everyone wants to know. Here, the professional fastener manufacturer explains the concept of total deformation: the total deformation refers to the wire drawing (rolling) after the carbon steel or stainless steel material has been properly heat treated to restore the plasticity of the material. The sum of the deformation amounts such as cold heading (shrink rod extrusion). If there is no shrinkage rod for the rod type, the hardness and strength of the rod before the cold heading must reach a certain value in advance, otherwise the strength requirement is difficult to achieve. In the case of pulling or cold rolling, the difference of raw materials (tempered material, normalized material, and non-returnable material) should be fully considered. If the hardness after drawing is too high and it is not conducive to cold forming, it must be taken care of.


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