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Ultrahigh-strength precise rectangular tube forming method and device

An ultra-high-strength, forming method technology, applied in the field of local heating roll bending, can solve the problem of inability to produce ultra-high-strength precision rectangular tubes, and achieve the effect of ensuring strength, high thermal efficiency and reducing costs

Active Publication Date: 2014-12-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method and device for forming an ultra-high-strength precision rectangular tube to solve the problem that the roll-forming process in the prior art cannot produce ultra-high-strength precision rectangular tubes

Method used

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  • Ultrahigh-strength precise rectangular tube forming method and device
  • Ultrahigh-strength precise rectangular tube forming method and device
  • Ultrahigh-strength precise rectangular tube forming method and device

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Experimental program
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Effect test

Embodiment 1

[0048] 1) Pre-bend the ultra-high-strength steel plate into a preformed rectangular tube with a fillet radius R=8, with a size of 40.0×40.0×2.0mm; 2) Rapidly heat the fillet of the preformed rectangular tube at a feed rate of 10m / min to 600°C; 3) After hot extrusion, finishing and straightening, a precision rectangular tube with a size of 38.5×38.5×2.0mm, a fillet radius R=4.0 and a dimensional accuracy of 0.1mm is obtained. After quality testing, the precision rectangular tube has less work hardening phenomenon, less residual stress and improved elongation.

Embodiment 2

[0050]1) Pre-bend the ultra-high-strength steel plate into a preformed rectangular tube with a fillet radius R=8, with a size of 40.0×40.0×2.0mm; 2) Rapidly heat the fillet of the preformed rectangular tube at a feed rate of 15m / min to 650°C; 3) After hot extrusion, finishing and straightening, a precision rectangular tube with a size of 38.0×38.0×2.0mm, a fillet radius R=2.0 and a dimensional accuracy of 0.1mm is obtained. After quality testing, the precision rectangular tube has less work hardening phenomenon, less residual stress and improved elongation.

[0051] The beneficial effects of above-mentioned technical scheme of the present invention are as follows:

[0052] (1) Compared with the traditional roll forming process, the hot roll forming technology of the present invention focuses on the application of high-strength steel or ultra-high-strength steel, and has obvious technical advantages and a wide range of applications; compared with hot stamping , The hot roll fo...

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Abstract

The invention provides an ultrahigh-strength precise rectangular tube forming method and an ultrahigh-strength precise rectangular tube forming device. The ultrahigh-strength precise rectangular tube forming method sequentially comprises the following steps: 1, selecting a preformed rectangular tube with a large fillet radius, and locally heating four fillets of the preformed rectangular tube to reach a preset temperature by using a heating fixture; 2, rolling the preformed rectangular tube heated to the preset temperature into a prefinished rectangular tube with a small fillet radius through a first finishing hole pattern roll bending process; 3, rolling the prefinished rectangular tube into a nearly sharp-angled precise rectangular tube through a second finishing hole pattern roll bending process. Compared with the conventional roll bending forming process, the hot roll bending forming technology provided by the invention concentrates on application of high-strength steel or ultrahigh-strength steel and has obvious technical leading advantages and a wide application range; compared with hot stamping, the hot roll bending forming process is high in forming speed, high in utilization ratio of materials and good in formability; through the ultrahigh-strength precise rectangular tube forming method, the nearly sharp-angled precise rectangular tube can be produced; the ultrahigh-strength precise rectangular tube forming device is good in performance.

Description

technical field [0001] The invention relates to the technical field of local heating roll bending, in particular to a method and device for forming an ultra-high-strength precision rectangular tube. Background technique [0002] In order to meet the increasingly stringent requirements for automobile lightweight, crash safety performance and exhaust emission, in addition to the use of lightweight materials such as Al, Mg and polymers, ultra-high-strength steels are increasingly used in the automotive industry. In the manufacture of foreign mainstream automobile bodies, replacing ordinary strength steel with ultra-high-strength steel is a direction for the development of modern auto parts. [0003] Taking the rectangular tube, the main structural part of the automobile, as an example, in its main preparation process, the roll forming process has higher forming ability and advantages, its production speed is fast, the cost is low, and the material utilization rate is high. For...

Claims

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Application Information

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IPC IPC(8): B21C37/15
Inventor 韩静涛彭雪锋马越峰晏培杰李丹阳陈强
Owner UNIV OF SCI & TECH BEIJING