Hot stamping formation method and pre-cooling device

Abstract

The invention discloses a hot stamping formation method. The method comprises the following steps of heating, wherein a high-strength steel plate is heated and subjected to heat preservation, so thatthe whole steel plate is turned into an austenite structure; pre-cooling, wherein a first area in the heated steel plate is in contact pressurization and is pre-cooled to the preset temperature range;hot stamping formation, wherein the pre-cooled steel plate is placed in a stamping die for stamping formation; and cooling and quenching, wherein pressure maintaining is performed until the temperature of the surface of the steel plate reaches to the preset range, and the steel plate is taken out from the stamping die and cooled to the room temperature. The first area inside the steel plate is turned into a mixed structure of martensite, bainite and pearlite, so that the steel plate outside the first area is turned into a martensite structure. According to the method, different parts of a hotstamping part have different structures and strengths, and the technology is simple, flexible and adjustable.

Description

technical field [0001] The invention relates to the technical field of metal plastic forming, in particular to a hot stamping forming method and a pre-cooling device. Background technique [0002] The lightweight of automobiles can effectively reduce the energy consumption of automobiles. One of the effective ways to realize the lightweight of automobiles is to use more ultra-high-strength steels to replace ordinary steels in automobile structural parts. Ultra-high-strength steel has strong impact resistance and can reduce the weight of the car body. However, it is difficult to form ultra-high-strength steel by traditional cold stamping. The material has poor plasticity, is easy to break, and deforms after forming, resulting in poor product accuracy. [0003] Ultra-high-strength steel hot stamping technology is an effective way to solve the above problems. It first heats the sheet to 850~950°C to make it evenly austenitized, and then quickly transfers it to a hot stamping di...

AI Technical Summary

Problems solved by technology

However, since the heating device is installed on the mold, the principle of rapid conductive heating of the blank is adopted, so that the temperature distribution of the slab tends to be high in the middle and low on both sides, and the complex distribution of the temperature of the slab cannot be achieved.

At the same time, heating in the mold makes the structure of the mold complex, the cost increases, and the reliability of the mold operation is reduced; heating without a protective atmosphere makes the slab easy to oxidize, and the quality of the hot stamping part decreases

Images