Integral forming method for nut board

Abstract

The invention relates to an integral forming method for a nut board, which comprises the steps of: A. firstly, stamping out a wide-aperture annular flanging with the same height as a nut on a motherboard at a time; B. secondly, tapering the inner diameter and the outer diameter of the annular flanging in a continuous stamping mode under the conditions that the height of the annular flanging is kept to be constant and the volume of the whole annular flanging is constant until the thickness of the annular flanging meets strength requirements; and C. finally, finishing and tapping the inner holeof the annular flanging so as to form the nut of the nut board. By adopting the technical proposal, the nut of the nut board formed by the integral forming method for a nut board in the invention avoids the problems of faulty riveting and faulty welding existing in riveting and welding, and has the advantages of high intensity and high pulling-out force resistance.

Description

technical field [0001] The invention belongs to the technical field of automobile panel manufacturing, in particular to a forming method of a nut plate applied to automobiles. Background technique [0002] The most commonly used manufacturing methods of nut plates for automobiles are as follows: Figure 1a , Figure 1b As shown, the nut 10 is connected to the mother plate 20 by means of riveting 11 or welding 12, so that the nut plate can be fixedly connected with other parts of the automobile. The nut plate requires that the thread torque and pull-off force at the connection between the mother plate and the nut will not loosen and the joint will not break when it reaches normal movement. However, riveting and welding may lead to virtual riveting and welding, and lasers need to be added during production. Testing and other instruments to test the reliability of the connection. But the torque and pull-off resistance are basically destructive experiments and cannot be tested...

AI Technical Summary

Problems solved by technology

In order to increase the wall thickness of the nut, some inventors currently adopt the method of punching and stretching and then upsetting to increase the wall thickness. However, after upsetting, the nut has problems such as overlapping materials in the inner hole, inverted cones, non-straight walls, and uneven wall thickness ( like image 3 As shown), and then punched to squeeze out the inner hole, it was found in the microscopic view of the material that the nut had problems such as fracture and the fluctuation of the tissue fiber flow, which damaged the strength and function of the nut.

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