Process and special device for integrally forming convex navel nut for riveting by using wire rods

Abstract

The invention discloses a process and special device for integrally forming a convex navel nut for riveting by using wire rods. The process comprises the following steps of: (1) cutting: feeding by an automatic feeding device and cutting a blank off by a cutting die; (2) reshaping: determining the number of stations needed actually according to the shape of a product and the stress situation of a die, and carrying out horizontal forging on the cut surface of the blank; (3) pre-forming of outer circle of the convex navel: positively extruding the outer circle of the convex navel and pre-forming; (4) final forming of the outer circle of the convex navel: carrying out pre-punching and carrying out pre-upset-extrusion on the shape to finally form the outer circle of the convex navel; (5) final forming of inner angle and height of the convex navel: carrying out dual impact front and back to realize the final forming of the inner angle and the height of the convex navel; (6) final forming of overbark of a pre-punched hole: finally forming the overbark of the pre-punched hole to obtain the required size; and (7) punching: punching to remove the overbark of the preformed hole to obtain the required size; and in the step (2) to the step (7), the blank is subjected to cold upsetting and forming through the die by adopting multi-station cold upsetting equipment. The process and the special device disclosed by the invention can realize production automation and standardization and have the characteristics of high production speed and high wire rod utilization ratio.

Description

Technical field [0001] The invention relates to the field of metal forging processing, and more specifically to a process and special equipment for integrally forming a convex umbilical nut for riveting by a multi-station cold heading machine using a coil element wire. Background technique [0002] Such as Figure 1A As shown, it is an advanced special fastener 9 formed by riveting the navel 911 nut 91 and the washer 92, which is widely used in aviation, automobile, tractor and other industries. With the increasing cost pressure, domestic automobile factories are gradually increasing the intensity of localized parts. The above-mentioned fasteners 9 have also become parts that require mass production. In order to produce the above-mentioned fasteners 9, it is necessary to design first And processed the convex navel 911 for riveting (such as Figure 1B Shown) and a nut 91 with the convex navel 911. [0003] Such as Figure 2A to Figure 2F As shown, the traditional process of the conv...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a process for integrally forming a umbilical nut for riveting with a disk element wire, so as to solve the problems of the umbilical nut for riveting formed in the prior art that the gasket is easy to fall off, the utilization rate of the material is extremely low, and the appearance is poor.

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