A differential temperature real-time detection device for steel mold bulging

Abstract

The patent of the invention relates to a differential temperature real-time detection device for steel mold bulging, which belongs to the technical field of stamping and forming. It is characterized in that: a CCD image sensor is installed and fixed in the groove on the lower surface of the die holder, an infrared temperature sensor is installed and fixed in the groove at the center of the lower surface of the mold handle, and the infrared temperature sensor can detect the temperature of the test piece in real time during the bulging process. Temperature, the CCD image sensor can detect and capture the rupture position of the bulging experiment in real time; when forming, the high-strength steel sheet is insulated with ceramic fiber paper, and heated to the preset temperature through a resistance heating wire. The experiment is performed by the crosshead of the stretching machine. It moves up and down to provide power; this device can provide a differential temperature bulging environment, which simulates the hot stamping process well. At the same time, the infrared temperature sensor and CCD image sensor can detect the temperature and capture the rupture position and rupture time in real time, which improves the Accuracy of forming limit measurement.

Description

technical field [0001] The patent of the invention relates to a differential temperature real-time steel mold bulging device. The device is mainly used for differential temperature steel mold bulging experiments, and then to measure the forming limit of high-strength steel sheets at different temperatures, so it belongs to the technical field of stamping and forming. Background technique [0002] With energy consumption, environmental pollution becoming more and more serious, and safety requirements continuously increasing, the automobile industry has continuously increased requirements for automobile lightweight and automobile safety performance. Hot stamping technology is one of the important advanced technologies to alleviate this phenomenon. Hot stamping technology refers to a new technology that heats the high-strength steel sheet to the austenitizing temperature (900°C), then quickly transfers it to the mold, and then performs stamping, quenching and pressure holding. ...

AI Technical Summary

Problems solved by technology

[0003] Forming limit is an important evaluation index to measure the comprehensive formability of materials. It is widely used in industry. It is a very important tool for judging the formability of sheet metal and solving sheet forming problems. The forming limit of the high-strength steel sheet has important significance; there are many measuring methods for the forming limit, and the methods widely used are the plane method and the hemispherical method; The forming limit measurement method is mainly to heat the high-strength steel sheet and the mold together to a set temperature in a closed furnace, and then conduct a bulging experiment to measure the forming limit of the material. The measured forming limit is in the isothermal The actual hot stamping is not consistent with the actual hot stamping, and the measured forming limit curve is larger than the actual one. At the same time, the existing method of controlling the stop of the punch mainly adopts the maximum forming force method, which is controlled by setting the control load. The punch stops, so it is difficult to grasp and capture the failure and cracking position of the high-strength steel sheet in real time

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