High-pressure gas bulging thermoforming segmental reinforcement die of boron steel pipe

Abstract

The invention relates to a high-pressure gas bulging thermoforming segmental reinforcement die of a boron steel pipe. The die comprises an upper die base and a lower die base, and is characterized in that an upper die hard area forming insert and an upper die soft area forming insert are mounted on the lower surface of the upper die base; a lower die hard area forming insert and a lower die soft area forming insert are mounted on the upper surface of the lower die base; the forming surfaces of the upper die hard area forming insert, the lower die hard area forming insert, the upper die soft area forming insert and the lower die soft area forming insert correspond to a hard area and a soft area on a workpiece of the boron steel pipe respectively; seal heads are arranged at the two ends of the workpiece respectively; the front ends of the seal heads are in contact with the pipe ends of the workpiece; an axial hydraulic cylinder or an air cylinder is connected to the rear ends of the seal heads; high-pressure gas passages are arranged in the centers of the seal heads respectively; the front ends of the high-pressure gas passages are communicated with the interior of the workpiece; a high-pressure gas station is connected to the rear ends of the high-pressure gas passages. According to the die, parts which need to be partitioned and customized according to product design and are variable in cross-section shape and circumference can be produced.

Description

Technical field [0001] The invention relates to a high-pressure gas bulging hot forming segmented strengthening die of a boron steel pipe, which belongs to the technical field of heat treatment plastic forming. Background technique [0002] As a new type of ultra-high-strength hot-formed steel pipe, automobile boron steel pipe provides the possibility of segmented strengthening technology-the same part can be obtained by using different heat treatment processes in different areas of the part according to the needs of automobile design Different strength and plasticity. The production process of the soft zone technology of hot forming boron steel material is divided into 4 stages: [0003] 1) Heating: heating the boron steel pipe to the temperature required for heat treatment; [0004] 2) Transfer: transfer the boron steel pipe to the die to be stamped; [0005] 3) Forming: stamping and forming by die at high temperature; [0006] 4) Quenching cooling: controlling different cooling ra...

AI Technical Summary

Problems solved by technology

Due to the limitations of the pipe making process and the mechanical properties of the material itself, the strength of the applied pipe fittings is limited, and the tensile strength is difficult to exceed 1000MPa

[0018] At present, the hot forming of common boron steel pipes is mostly an ordinary hot stamping process. There is no high-pressure medium inside the forming process, and it can only adapt to products with equal cross-section perimeters, and the product shape is very limited.

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