Ultrahigh strength open section hot roll forming process and device

Abstract

The invention relates to an ultrahigh strength open section hot roll forming process and an ultrahigh strength open section hot roll forming device. The ultrahigh strength open section hot roll forming process comprises the following steps of: 1, uncoiling and cutting; 2, forming, i.e. transferring a sheet metal into roll forming equipment and preforming the sheet metal into a semifinished product open section under the condition of room temperature; 3, heating, i.e. heating the section to a temperature of 800 to 1,100 DEG C and preserving heat for 2min to 6min; and 4, stamping and sizing, i.e. rapidly transferring the section into a stamping die to carry out shaping and cooling, totally coating the section with a shaping die, loading the shaping die by 3 to 10 stamping racks, utilizing the die to shape the semifinished product open section into a finished product of which the size accords with the requirements after loading the shaping die, and when shaping, filling a circulating cooling medium in a passage below the surface of the die, utilizing the temperature difference of the die and the section to quench the high temperature section and cooling the open section in a pressure maintaining state to enable a microstructure of the section to be rapidly transformed from an austenite structure at a high temperature into a martensitic structure at normal temperature from an austenite structure at a high temperature so as to obtain a high strength section.

Description

technical field [0001] The invention relates to the preparation of ultra-high-strength profiles, in particular to a hot roll-bending process and device for ultra-high-strength open profiles. Background technique [0002] The hot forming process of boron steel is to first transform the initial structure into ferrite and pearlite, and the boron steel sheet with a tensile strength of about 600MPa is heated to austenitize and then formed, and then the workpiece is cooled and completely transformed into martensite. body, to obtain high-strength workpieces. After cooling, the tensile strength of the boron steel workpiece is as high as 1500MPa. The chemical composition of hot-formed boron steel is: Al0.02%-0.05%, B0.001%-0.005%, C0.007%-0.33%, Cr0.16%-0.37%, Mn0.75%-1.21%, N0 .004-0.006%, Ni0.01-0.1%, Si0.20%-0.40%, Ti0.03%-0.05%, and the rest is Fe. [0003] At present, the hot forming process of boron steel is mainly hot stamping forming process. However, the hot stamping pro...

AI Technical Summary

Problems solved by technology

[0005] The hot roll forming process combines the high temperature forming process with the roll forming process, which not only meets the forming requirements of high-strength steel, realizes efficient production, but also can effectively overcome the forming defects of high-strength steel such as poor plasticity and large springback

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