Cap nut forming process and forming device

Abstract

The invention relates to a cap nut forming device. The device comprises a feeding mechanism and five molds which are sequentially arranged, wherein the feeding mechanism moves and performs feeding among the five molds, the five molds comprises a pre-upsetting mold for obtaining a shaped blank, a hexagonal upsetting mold used for forming a hexagonal blank, an upsetting pre-forming mold used for generating a preformed blank, a forming mold for further processing the preformed blank, and a through hole mold used for completing perforation of a through inner hole of a finished product cap flange nut. The forming process by utilizing the cap nut forming device comprises the following steps of shaping, hexagonal upsetting, hexagonal flange cap prototype upsetting, forming, and inner hole perforation. By adopting the technical scheme, the process and the cost of cap welding or cap riveting are reduced, the cost of secondary tapping after the cap welding or cap riveting is reduced, the cost waste and the quality risk caused by the problem of thread pass caused by cap welding or cap riveting are avoided, and a cold extrusion primary forming process is adopted, so that the production cost isreduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a forming process and a forming device of a cap nut. Background technique [0002] Cap nuts are widely used in auto parts, and their market demand is large. A cap nut includes a nut body and a cap. The general technical solution is that the nut body and the cap are of a split structure, and the two are connected by welding or riveting. After the split structure is adopted, the nut body is an existing standard nut, and the cap is only needed to be welded or riveted on the standard nut. As a result, the nut cannot pass through, and secondary tapping is required. The processing cost is high, and there is a risk of being unable to stop after the secondary tapping. In summary, it can be seen that the existing cap nut forming process obviously has inconvenience and defects in actual use, so it is necessary to improve it. Contents of the invention [0003] To sum up, ...

AI Technical Summary

Problems solved by technology

After the split structure is adopted, the nut body is an existing standard nut, and the cap is only needed to be welded or riveted on the standard nut. As a result, the nut cannot pass through, and secondary tapping is required. The processing cost is high, and there is a risk of being unable to stop after the secondary tapping

In summary, the existing cap nut molding process obviously has inconvenience and defects in actual use, so it is necessary to improve it

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