Segmental Strengthening Technology of Boron Steel Pipe by Inflatable Hot Forming

Abstract

The invention relates to a gas bulging hot formation segmentation strengthening process of a boron steel tube. The process comprises the following steps of: performing segmentation strengthening in a hot formation segmentation strengthening die, wherein the hot formation segmentation strengthening die comprises an upper die holder and a lower die holder, the lower surface of the upper die holder is provided with an upper die hard area formation insert and an upper die soft area formation insert, and the upper surface of the lower die holder is provided with a lower die hard area formation insert and a lower die soft area formation insert; the formation faces of the upper die hard area formation insert, the lower die hard area formation insert, the upper die soft area formation insert and the lower die hard area formation insert are respectively corresponding to the hard areas and the soft areas of the boron steel tube workpiece; the process particularly comprises the following steps of: (1) bending the tube and preforming; (2) heating boron steel tube parts, and preheating the upper die soft area formation insert and the lower die soft area formation insert; (3) conveying the workpiece; (4) completing gas bulging forming under high pressure; (5) maintaining pressure and quenching; (6) relieving the pressure and opening the die. According to the product design requirement, the zoned and customized parts with the changed cross-section shape and circumference can be produced by the process.

Description

technical field [0001] The invention relates to a segmental strengthening process of inflatable thermoforming of a boron steel pipe, and 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, automotive boron steel pipe provides the possibility for segmental strengthening technology—the same part can adopt different heat treatment processes in different regions of the part according to the needs of automobile design, so as to obtain Different strength and plasticity. The production process of the soft zone technology for hot-formed boron steel materials is divided into 4 stages: [0003] (1) Heating: heating the boron steel pipe to the temperature required for heat treatment; [0004] (2) Transmission: transfer the boron steel pipe to the mold to be stamped; [0005] (3) Forming: Stamping and forming by mold at high temperature; [0006] (4) Quenching and cooling: Control...

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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