High-temperature high-speed metal sheet hot stamping forming limit testing device and method

Abstract

The invention provides a high-temperature high-speed metal sheet hot stamping forming limit testing device and a high-temperature high-speed metal sheet hot stamping forming limit testing method. Thehigh-temperature high-speed metal sheet hot stamping forming limit testing device comprises a high-frequency induction heating box, a robotic arm, a stamping structure, a supporting structure, an optical strain measuring device, an infrared thermometer and a control device, wherein the stamping structure comprises a hemispherical stamping head, a blank pressing ring and a concave mould; a high-power stamping head heating rod and a stamping head temperature sensor are arranged inside the hemispherical stamping head; high-frequency induction coils are arranged on the peripheries of the blank pressing ring and the concave mould; high-power heating rods and temperature sensors are arranged inside the blank pressing ring and the concave mould; the supporting structure comprises an upper mould frame and a lower mould frame which are connected through guide posts; a stamping head hydraulic cylinder and a blank pressing ring hydraulic cylinder are mounted on the upper mould frame; the hemispherical stamping head is connected with the stamping head hydraulic cylinder through a connecting rod; the blank pressing ring is connected with the blank pressing ring hydraulic cylinder; the concave mould is fixedly mounted on the lower mould frame. Through the high-temperature high-speed metal sheet hot stamping forming limit testing device and the high-temperature high-speed metal sheet hot stamping forming limit testing method, a high-temperature and high-speed metal sheet forming limit diagram which fully meets the actual industrial hot stamping technological flow can be established, a covered working condition range is wide, the applicability is strong, optimization of a hot stamping technology can be effectively guided and the research and development cycle of a product is shortened.

Description

technical field [0001] The invention relates to the technical field of sheet metal forming, in particular to a high-temperature and high-speed sheet metal hot stamping forming limit testing device and testing method. Background technique [0002] Energy saving and environmental protection are the themes of the development of today's automobile manufacturing industry. For new energy vehicles, consumers will first pay attention to energy consumption when buying a car; on the other hand, the country has issued corresponding regulations, which clearly require light vehicles to be marked with fuel consumption labels when they leave the factory. Therefore, the lightweight of the body will be the focus of attention of automobile manufacturers. [0003] The body structural parts made of high-strength steel plates can not only reduce the weight of the body, but also ensure the collision safety of the whole vehicle. On the other hand, the high cost performance of high-strength steel...

AI Technical Summary

Problems solved by technology

Similar to the Chinese patent with the application number 201410076406.8, the heating furnace is used to heat the mold, the heating efficiency is low, and the energy waste is serious; at the same time, the cooling of the mold is slow, resulting in a long cycle of forming limit tests at different temperatures; this patent adopts the traditional method, by measuring the sample The deformation of the etched grid on the workpiece is used to calculate the ultimate strain. The selection of the critical grid is greatly influenced by subjective factors; Continue to tear, the calculation result is inaccurate

[0009] To sum up, there is no relevant report on the test device and method for the hot stamping forming process of high-temperature and high-speed metal sheet. It is urgent to design a test device and method to simulate the forming process of high-temperature and high-speed metal sheet and obtain its forming limit. Assess its formability

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