Method for monitoring service life of steel-aluminum hybrid vehicle body self-piercing riveting die based on riveting curve

Abstract

The invention discloses a method for monitoring the service life of a steel-aluminum hybrid vehicle body self-piercing riveting die based on a riveting curve. The method comprises the following stepsthat a riveting pressure value is monitored in real time through a pressure sensor and is transmitted to a monitoring host; the material information, the rivet information and the riveting die information of the riveting combination are input in the monitoring host; the rivet-die volume ratio c is calculated according to the rivet information and the riveting die information; according to the material information, the riveting pressure and the rivet-die volume ratio c, the experience database is called to query the riveting die service life influence factor a; and the current service life NR of the riveting die is calculated by using a formula, and when NR is smaller than the set value, early warning of riveting die replacing is performed. According to the method, the change of the riveting pressure curve is monitored in real time, so that the factors influencing the riveting die are obtained, the current service life of the riveting die is calculated according to the riveting pressure, the rivet-die volume ratio and the plate information, early warning is conducted in advance, the situation that people can not realize the damage of the riveting die is avoided, and the riveting quality of the white body is guaranteed.

Description

technical field [0001] The invention relates to a self-piercing riveting process, in particular to a method for monitoring the life of a self-piercing riveting die of a steel-aluminum mixed vehicle body based on a riveting curve. Background technique [0002] The self-piercing riveting process, referred to as SPR, is one of the commonly used processes for aluminum alloy body connection. SPR is powered by a hydraulic cylinder or a servo motor to directly press the rivet into the plate to be riveted, and the plate to be riveted is plastically deformed under the pressure of the rivet and the rivet, and is filled in the riveting mold after forming to form a stable connection. New panel joining technologies such as figure 1 shown. [0003] Whether the riveting quality is qualified or not, the riveting mold plays a very important role. During the riveting process, if there are cracks, cracks, or gaps in the riveting die, the riveting quality will be unqualified. If the rivetin...

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Problems solved by technology

[0006] 2) Use the riveting mold to take pictures to identify the damage of the riveting mold, but the error is relatively large, and there will be a lot of false positives, which will lead to frequent error reporting of the thread body and affect the automatic production of the thread body. The utilization rate of this method is very low

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