Warm press molding method and automotive frame components

A molding method, warm pressing technology, applied to vehicle parts, manufacturing tools, furnace types, etc., can solve problems such as large shape changes, limited parts, poor dimensional accuracy, etc., and achieve the effect of improving environmental problems

Active Publication Date: 2016-01-06
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-strength steel sheets generally have poor press formability, and the shape change (springback) caused by elastic recovery after mold release is large, and poor dimensional accuracy is prone to occur, so the parts that are currently applied to press forming are limited.

Method used

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  • Warm press molding method and automotive frame components
  • Warm press molding method and automotive frame components
  • Warm press molding method and automotive frame components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0197] Steel plates with a thickness of 1.6mm and a tensile strength of 440MPa class to 1180MPa class were heated under the conditions shown in Table 1, and then formed into Image 6 (a) The upper pressure plate of the center pillar, one of the car frame components shown. In addition, for comparison, under the conditions shown in Table 1, the forming of the center column upper plate was carried out by warm drawing forming and cold flangeless drawing forming at room temperature (the steel plate was not heated).

[0198] Here, an electric furnace is used for heating the steel plate. The time in the furnace was set to 300 seconds, so that the entire billet was heated with a uniform temperature distribution. The heated billets were taken out of the furnace, fed into a press after a transfer time of 10 seconds, and formed under the conditions shown in Table 1. Immediately thereafter, the temperature difference between the flange portion and the portion other than the flange porti...

Embodiment 2

[0211] Molten steel having the composition shown in Table 2 was smelted in a converter and cast by a continuous casting method to produce a thick slab (steel raw material). These thick steel billets (steel raw materials) were heated to the heating temperature shown in Table 3, soaked and held, and after rough rolling, they were finished rolled and cooled under the hot rolling conditions shown in Table 3, and coiled into coils. Made into a hot-rolled steel plate (thickness: 1.6mm). It should be noted that the steel sheets a, i, k, and m are heated to 700°C in a continuous hot-dip galvanizing line, and then immersed in a hot-dip galvanizing bath with a liquid temperature of 460°C to form a hot-dip galvanized layer on the surface. , and then perform alloying treatment on the coating layer at 530° C. to form an alloyed hot-dip galvanized layer. It should be noted that the plating adhesion is 45g / m 2 .

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Abstract

When a steel plate with a tensile strength of 440 MPa or more is formed into a press-formed product including a flange portion and a portion other than the flange portion by press molding, the steel plate is heated in the temperature range of 400°C to 700°C, and then a pressureless In side draw forming, the heated steel plate is press-formed. At this time, the average temperature difference between the flange portion of the press-formed product immediately after forming and the portion excluding the flange portion is within 100°C, thereby suppressing springback. Such as shape change, improve the dimensional accuracy of the plate, and then easily obtain the desired mechanical properties in the press-molded product.

Description

technical field [0001] The present invention relates to a warm press forming method capable of suppressing poor dimensional accuracy due to shape changes such as springback that occurs when high-strength steel sheets are press-formed. [0002] Furthermore, the present invention relates to an automobile frame member manufactured by the above-mentioned warm press molding method. Background technique [0003] The application of high-strength steel plates to vehicle components has been studied in order to balance the weight reduction of the vehicle body for the purpose of increasing fuel consumption ratings and the improvement of collision safety for passenger protection. However, high-strength steel sheets generally have poor press formability, and have a large shape change (springback) due to elastic recovery after mold release, and are prone to poor dimensional accuracy. Therefore, the parts to which press forming is currently applied are limited. [0004] Therefore, in orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/20B21D22/21B21D22/26C21D9/00C21D9/46C22C38/00C22C38/14C22C38/60
CPCC21D9/46C22C38/14C22C38/60B21D22/208C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C21D8/0226C21D1/673C21D2211/004C21D2211/005C22C38/00C22C38/002C22C38/005C22C38/007C22C38/008C22C38/08C22C38/105C22C38/20C22C38/24C22C38/28C22C38/44C22C38/50B21D53/88B21D22/21B62D29/007
Inventor 玉井良清时田裕一簑手彻藤田毅
Owner JFE STEEL CORP
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