Method and pressing device for forming a press connection between a fitting element and a pre-punched component

摘要

In order to reliably ensure a press-in connection between joining elements, in particular a press-in nut and a pre-punched component, a press-in device contains a die which has a die ring and a die mandrel. The die mandrel is mounted counter to a spring force in the manner of a pilot pin. In addition, the die ring is also mounted counter to a spring force such that a two-stage press-in operation is carried out. Preferably, during a first press-in stage an anti-rotation lock is formed between the press-in nut and the component and in a second press-in stage an axial pull-out prevention measure is formed. To this end, the die mandrel deforms a nut flange.

主权项

1. A method for forming a press-in connection between a joining element and a pre-punched component, which comprises the steps of:
pressing-in the joining element in an axial direction against a die, wherein the die deforms the joining element and the die has a die ring and a die mandrel mounted to so as to be displaceable in the axial direction counter to a spring force, the die mandrel being in the form of a pilot pin having a conical mandrel tip and being used to deform the joining element, performing the pressing-in step in two stages with two press-in stages and the die ring being displaced in the axial direction counter to the spring force during the pressing-in step, wherein the spring force acting on one of two parts consisting of the die ring and the die mandrel being sufficiently large for the one part to be kept in a front position during one of the press-in stages; exerting different press-in forces in the two press-in stages, and in that only one of the two parts consisting of the die mandrel and the die ring is pressed into an axially retracted position counter to spring forces in a first press-in stage of the two press-in stages and both parts are pressed into the axially retracted position counter to the spring forces in a second press-in stage of the two press-in stages; and placing the joining element on to the die mandrel for centering purposes prior to an actual press-in operation, the die mandrel supporting the joining element by way of the conical mandrel tip above a level of the pre-punched component, wherein the conical mandrel tip widens up to a diameter which is larger than an inside diameter of the joining element.