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Method and device for forming ultra-high-strength precision rectangular tube

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 effects of ensuring strength, reducing straightening tension and fast forming rate

Active Publication Date: 2016-12-07
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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  • Method and device for forming ultra-high-strength precision rectangular tube
  • Method and device for forming ultra-high-strength precision rectangular tube
  • Method and device for forming ultra-high-strength precision rectangular tube

Examples

Experimental program
Comparison scheme
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 present invention provides a method and device for forming an ultra-high-strength precision rectangular tube. The method includes the following steps in sequence: Step 1: Take a preformed rectangular tube with a large fillet radius, and perform local heating on the four fillet parts by a heating fixture. Heating to the preset temperature; step 2, the preformed rectangular tube heated to the preset temperature is rolled into a pre-finished rectangular tube with a small fillet radius in the first finishing pass roll bending process; step 3, the preformed rectangular tube is rolled into a small fillet radius The finishing rectangular tube is rolled into a precision rectangular tube with a near-sharp angle in the second finishing pass roll bending process. 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, hot roll The bending forming process has fast forming speed, high material utilization rate and good forming performance; this process can produce near-sharp rectangular tubes with good 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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Patent Type & Authority Patents(China)
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
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