Cold heading device and cold heading process for rivet nut forming, and rivet nut

Abstract

The invention discloses a cold heading device for rivet nut forming. The cold heading device comprises a cold heading machine and a mold assembly mounted on the cold heading machine, wherein the moldassembly comprises a first mold, a second mold, a third mold, a fourth mold, and a fifth mold, the first mold is used for forming a preset head part on the upper part of a preset blank; the second mold is used for forming a head fixed point in the preset head part and forming a step part between the preset head part and the lower part of the preset blank; the third mold is used for reversely extruding first inner holes in the preset head part and the step part; the fourth mold is used for forming a flange part on the preset head part and forming knurled teeth on the step part; the flange partcomprises a lower head groove; and the fifth mold is used for reversely extruding a second inner hole in the lower part of the preset blank. A rivet nut manufactured through using the cold heading device can ensure the sealing performance and the minimum torque attenuation in a limited space.

Description

technical field [0001] The invention relates to the field of fastener manufacturing, in particular to a cold heading device for forming blind rivet nuts, a cold heading process, and the formed blind rivet nuts. Background technique [0002] Blind rivet nut is a kind of nut that is fastened and connected with the connected parts through the form of rivet. It is currently widely used in the assembly of electromechanical and light industrial products such as automobiles, aviation, instruments, furniture, and decoration. Developed to solve the shortcomings of metal sheets and thin tubes that weld nuts are easy to melt, and tapping internal threads is easy to slip. [0003] However, for some small-sized blind rivet nuts, it will be found that their sealing performance is poor during use. For some occasions that require high sealing performance, their sealing effect often cannot meet the requirements of use. In order to solve their sealing performance, now Some methods are: 1. Ap...

AI Technical Summary

Problems solved by technology

[0003] However, for some small-sized blind rivet nuts, it will be found that their sealing performance is poor during use. For some occasions that require high sealing performance, their sealing effect often cannot meet the requirements of use. In order to solve their sealing performance, now Some methods are: 1. Apply glue to the bottom of the rivet nut as a whole. This method will cause the torque of the rivet nut to attenuate, so that the sealing performance and torque resistance of the rivet nut cannot be guaranteed; Blind rivet nuts are covered with O-rings, but because the overall size of the rivet nuts is too small, the processing of O-rings is difficult, the cost is high, and manual assembly is required, which is inefficient

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