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A hot-bath forming process for high-corrosion-resistant and easy-to-weld hot-pressed parts

A forming process and component technology, which is applied in the field of hot bath forming process of high corrosion resistance and easy to weld hot-pressed components, can solve the problems such as the difficulty of uniform and controllable cleaning of the extremely thin surface oxide layer, and the difficulty of controlling the pre-cooling temperature, etc., to achieve Reduce mold damage, reduce processing and manufacturing costs, and reduce the effect of thermal fatigue

Active Publication Date: 2022-07-22
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the deficiencies in the prior art, especially the extremely thin surface oxide layer is difficult to uniform and controllable cleaning, the pre-cooling temperature is difficult to control, etc., so as to provide a hot bath forming of high corrosion resistance and easy welding hot-pressed parts Process, balance the forming temperature of the coating and the forming temperature of the substrate, immerse the sheet in boiling water, use the bubbles generated between the boiling water and the hot sheet to remove the oxide layer on the surface of the steel plate evenly and controllably, and uniformly and accurately control the forming temperature of the sheet

Method used

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  • A hot-bath forming process for high-corrosion-resistant and easy-to-weld hot-pressed parts
  • A hot-bath forming process for high-corrosion-resistant and easy-to-weld hot-pressed parts
  • A hot-bath forming process for high-corrosion-resistant and easy-to-weld hot-pressed parts

Examples

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Effect test

Embodiment 1

[0043] A hot bath forming process for high corrosion resistance and easy welding hot pressing parts, such as figure 1 shown, including the following steps:

[0044] S1, 1.5mm thick galvanized hot forming steel sheet (matrix composition includes C 0.18-0.21wt%, Si 0.05-0.2wt%, Mn 1.5-2.2wt%, Cr 0-0.3wt%, Mo 0-0.25wt% , Ti 0.02-0.04wt%, Nb 0-0.1wt%, B 0.002-0.006wt%, P 0-0.020wt%, S 0-0.003wt%, Al 0.02-0.06wt%, N 0-0.006wt%; Double GI type galvanized 150g / m 2 , the thickness of one side is 11um) and transferred to a box-type heating furnace at 890° C. for 5 minutes to complete austenitization; the oxygen content (volume fraction) of the atmosphere in the heating furnace is 20%.

[0045] S2. After the heating is completed, the sheet is transferred to a boiling water tank, immersed in boiling water for uniform cleaning and cooling, the depth is 3-1000mm, and the boiling water temperature is 100°C; the residence time of the steel plate in the boiling water is 6s.

[0046] S3. Si...

Embodiment 2

[0050] A hot-bath forming process for high-corrosion-resistant and easy-to-weld hot-pressed parts, comprising the following steps:

[0051] S1, 1.5mm thick galvanized hot forming steel sheet (matrix composition includes C 0.05-0.35wt%, Si 0.05-0.2wt%, Mn 0.5-2.5wt%, Cr 0-0.3wt%, Mo 0-0.25wt% , Ti 0.02-0.04wt%, Nb 0-0.2wt%, V 0-0.2wt%, B 0.002-0.006wt%, P 0-0.020wt%, S 0-0.003wt%, Al 0.02-0.06wt%, N 0-0.006wt%, other elements are Fe; double GA type galvanized 150g / m 2 , the thickness of one side is 11um) is transferred to a 900 ℃ box-type heating furnace, maintained for 5 minutes, and austenitization is completed; the oxygen content (volume fraction) of the atmosphere in the heating furnace is 20%.

[0052] S2. After the heating is completed, the sheet is transferred to the boiling water tank, immersed in boiling water for uniform cleaning and cooling, the depth of the sheet is 3-1000mm, and the boiling water temperature is 80°C; the residence time of the steel sheet in the bo...

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Abstract

The invention provides a hot-bath forming process for high-corrosion-resistant and easy-to-weld hot-pressed parts, and relates to the fields of thin-plate hot-stamping and sheet metal parts manufacturing. The process includes the following steps: S1, heating the coated hot forming steel sheet in a heating furnace to a completely austenitized state; S2, transferring the heated coated hot forming steel sheet to a boiling water tank, immersing it in boiling water, cleaning Oxide layer; S3. The hot-formed steel sheet of the coating is formed, pressure-maintained and quenched under the combined action of boiling water and upper and lower molds to obtain parts; S4. of moisture. The process provided by the invention immerses the sheet material in boiling water, uniformly and controllably removes the surface oxide layer by means of the bubbles generated between the boiling water and the hot sheet material, uniformly and accurately controls the forming temperature of the sheet material, and simultaneously performs forming and quenching in the boiling water. , which can improve the production quality of parts, improve the service life of the mold, and save production costs.

Description

technical field [0001] The invention relates to the fields of thin plate hot stamping and sheet metal parts manufacturing, in particular to a hot bath forming process for high corrosion-resistant and easy-to-weld hot-pressed parts. Background technique [0002] The main processes in the hot stamping forming process are: billet heating - stamping forming and quenching - laser trimming and shot blasting. Hot stamping forming technology is widely used due to the advantages of small forming force, small springback of parts, and high strength of parts after forming; however, hot forming parts of bare plate and Al-Si coated plate lack cathodic protection, and the parts are cut during service. The edge position will corrode in advance, especially the lower body parts, such as the sill beam. [0003] Due to the low melting point of the zinc coating (the melting point of pure Zn is only about 400 °C), the austenitization temperature of the matrix material is high (850-900 °C); and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B3/10B08B3/12B21D22/02C21D1/18C21D8/02C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C23C8/10C23C8/80C23F17/00C23G1/19
CPCB08B3/106B21D22/022B08B3/12C23F17/00C23C8/10C23C8/80C23G1/19C21D1/18C22C38/02C22C38/04C22C38/22C22C38/28C22C38/26C22C38/24C22C38/32C22C38/06C21D8/0205C21D8/0247C22C38/38C22C38/12C22C38/14B32B15/013C21D1/673C21D1/63C21D7/13C21D8/005C23C2/06C23C2/28C23C2/40C23C8/02C23C8/14C23C8/18C23G1/24C21D9/46C21D2211/001C22C38/001C22C38/002
Inventor 刘培星郝亮陈钢高兴昌高鹏金光宇侯晓英汤化胜孙卫华
Owner SD STEEL RIZHAO CO LTD