Pressure cooling process and mold hydraulic device for hot-formed steel pipe segment strengthening parts

Abstract

The invention discloses a pressure cooling process of segmented reinforcing type parts of a hot forming steel pipe, and a die hydraulic device. Through a hydraulic cylinder device in a die, existence of pressure keeping loading force borne by a workpiece is controlled according to the design requirements, and therefore the cooling speed of each sub-area is controlled, and different types of material mechanical performance of the sub-areas of a tubular product is obtained. Required material characteristics can be achieved for any area according to the design requirements, no additional die heating device needs to be arranged, and production cost and procedure complexity are greatly reduced.

Description

technical field

[0001] The invention relates to a method in the technical field of high-strength steel stamping, in particular to a pressure cooling process and a mold hydraulic device for segmentally strengthened hot-formed steel pipe parts with a strength of about 1500MP. Background technique

[0002] As a new type of ultra-high-strength hot-formed steel pipe for automobiles, boron steel pipes for automobiles provide 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: Stam...

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