Flow drill screwing process parameter conversion key point self-adaption switching method

Abstract

The invention discloses a flow drill screwing process parameter conversion key point self-adaption switching method. The flow drill screwing process parameter conversion key point self-adaption switching method comprises the steps of a calibration stage, specifically, a pressing block of flow drill screwing equipment is made to contact with a guide rod in the same plane, and a relative position measured by a coded ruler is taken as a null point; a cap seeking stage, specifically, after a riveting process begins, the actual pressure F3 of the guide rod is gathered, when the F3 = Faverage + a, arelative position L3 corresponding to the pressure point F3 is recorded and is taken as a cap seeking conversion point position, and then switching to puncturing stage parameters is performed; and apuncturing stage, specifically, the maximum pressure Fmax of the guide rod is monitored in the puncturing stage, then the descending pressure F4 of the guide rod is monitored, when the F4 = Fmax * b%,a relative position L4 corresponding to the pressure point F4 is recorded, and if the L4 is less than L3 - D2, the L4 is taken as a puncturing conversion point position, and a tapping stage is performed. According to the flow drill screwing process parameter conversion key point self-adaption switching method, by means of gathering of riveting force and displacement signals and in combination with a control logic, cap seeking and puncturing conversion points are accurately identified.

Description

technical field [0001] The invention relates to a flow drill tightening process, in particular to a method for adaptively switching key points for conversion of flow drill tightening process parameters. Background technique [0002] The flow drilling and tightening process is referred to as FDS, which is one of the commonly used processes for aluminum alloy body connection. It is mainly used in the case where there are cavities in the parts of the aluminum alloy body, such as the bottom plate is made of aluminum alloy profiles and castings. [0003] The process of FDS is divided into four major steps, which are cap searching, piercing, tapping, and final tightening. Among them, the hat-seeking logic and the puncture logic are the most crucial, and the logic of the prior art is as follows: [0004] Such as figure 1 As shown, when the FDS equipment touches the pressure block 1 and the guide rod 2 on the same plane 3, the relative position recorded by the code bar of the pre...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide an adaptive switching method for the key points of flow drilling tightening process parameters conversion, so as to solve the nailing failure caused by the fluctuation of the plate thickness

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