Multi-water-channel hot stamping die

Abstract

The invention provides a multi-water-channel hot stamping die. The multi-water-channel hot stamping die comprises an upper die base, upper die inserts, a lower die base and lower die inserts. The upper die base and the lower die base are each provided with a main water channel, a plurality of cavities are formed in each main water channel, the cavities are communicated through water passing openings, the caliber of each water passing opening is far smaller than the size of the corresponding cavity, cooling media in the water channels and the cavities in a stable state can be changed into a turbulent flow state, and the cooling efficiency is improved. Meanwhile, the multiple cavities are arranged in a non-single straight line in the main water channels, water retaining blocks are placed insome water passing openings of the cavities, multiple cooling areas can be formed, the multiple inserts are correspondingly arranged in the multiple cooling areas, simultaneous cooling of the multipleinserts can be achieved, water supply cooling can be conducted on only one insert, The cooling water flow of the main water channels is controlled in a targeted mode, unnecessary cooling circulationis reduced, the main water channels and all parts of the inserts are accurately controlled to be evenly cooled, a hot stamping part is fully and evenly cooled, and the problems that the mechanical property of the hot stamping part is unstable and the deformation amount is large are solved.

Description

technical field [0001] The invention relates to the technical field of hot stamping, in particular to a multi-channel hot stamping die. Background technique [0002] After heat treatment such as quenching and nitriding, the strength of high-strength steel plate can reach 1000-1500MPa, which is about 3-4 times that of ordinary steel. Due to the relatively large yield strength of high-strength steel and ultra-high-strength steel at room temperature, the range of plastic deformation is small, and the thickness of the sheet is thin, the ordinary cold stamping method is adopted, and the effect of high-strength steel plate under large forming force It is easy to crack and spring back, which reduces the dimensional stability of stamping parts; at the same time, problems such as mold wear under the action of forming force occur. At present, hot stamping forming technology is generally used. The hot stamping forming technology is to heat the high-strength steel plate or high-strengt...

AI Technical Summary

Problems solved by technology

Due to the relatively large yield strength of high-strength steel and ultra-high-strength steel at room temperature, the range of plastic deformation is small, and the thickness of the sheet is thin, the ordinary cold stamping method is adopted, and the effect of high-strength steel plate under large forming force It is easy to crack and rebound, which reduces the dimensional stability of stamping parts; at the same time, problems such as mold wear under the action of forming force occur

At present, hot stamping forming technology is generally used. The hot stamping forming technology is to heat the high-strength steel plate or high-strength steel plate to 900-950 degrees and keep it warm for 2-3 minutes to make it completely austenitized, and then use a special clamping mechanism. The mechanical arm quickly and accurately puts the heated steel plate into the mold for stamping processing. After holding the pressure for a period of time, it is quenched in the mold to obtain a martensite structure. The martensite structure has high strength, with a strength of 1500MPa. If the steel plate If the martensitic transformation cannot be completely carried out, a bainite structure will be formed inside the part. Because the bainite structure is brittle, the mechanical properties of the part will be greatly affected; the design of the cooling part in the mold is good or bad. It directly affects the martensite in the in-mold quenching process. There are mainly two types of problems in the actual production and application of the existing hot stamping dies. The mechanical properties of the stamping parts are unstable and the local mechanical properties are different; another kind of problem is that the cooling speed of each part of the stamping part is very different, resulting in a large amount of deformation of the stamping part

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