Clinching method and tool therefor

Abstract

The invention relates to a method and tool for carrying out said method in order to produce a clinching connection. According to the invention, wall sections (8) of the working opening (4) of the matrix (5) are provided with a flexible design and after covering a certain distance, are stopped by a stop in order to achieve a strain hardening of the squeezed material.

Description

technical field [0001] The invention relates to a method for riveting a component having at least one sheet metal according to claim 1 , and a tool according to subclaim 5 , in particular a tool for implementing the method. Background technique [0002] In a known method (GB 2069394 A) the wall segments rest on four struts constituting the mould, wherein these struts are in a radially elastic state with spaces between the struts for receiving the rheological material , showing its flaws because of the inability to control the shape of the latter. In one embodiment, such voids are also designed on the bottom surface of the mould, so that during the rheological process of the surface part, the radial flow is also influenced. According to another embodiment presented therein, the bottom surface, at least in its central region, is closed and made as a flexible plunger. It also has the disadvantage that during the radial dispersion, the compressed material penetrates into the s...

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Problems solved by technology

It also has the disadvantage that during radial dispersion, the compressed material enters the space between the struts and presses the plunger

Here, the disadvantage is that, on the one hand, the rheological material will be squeezed into the gap formed in it under the mutual tendency given by the opposite wall parts during processing; The section tends to taper outwards, that is, it has a tendency to turn around

The disadvantage is that the bottom surface of the mold forms the end surface of the plunger protruding into the mould, and the mold wall part, on one of its steps, is guided for the rheological process

Furthermore, it is believed that the known protrusion on the end face of the plunger is necessary, which must have an influence on the rheological process

The disadvantage of using such a tool is that transverse forces act on the upper end of the mold wall part and thus create a turning moment

It may cause skewing of the guide rods housed in the cage

In addition, the disadvantage is that the rheological material enters the region between the wall part and the plunger, so that the rheological process originally related to the deformation of the material on the plate section cannot be controlled to a large extent, wherein the protrusion is for The bottom of the plunger is more of a negative influence

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