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Production method for hot press molded articles, press molded article, die mold and mold set

A technology of hot press forming and manufacturing method, which is applied in the fields of manufacturing hot press forming products, press forming products, die dies and die sets, and can solve problems such as processing defects

Active Publication Date: 2020-11-13
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this alloy layer is extremely hard, processing defects are formed by contact with the mold during press processing

Method used

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  • Production method for hot press molded articles, press molded article, die mold and mold set
  • Production method for hot press molded articles, press molded article, die mold and mold set
  • Production method for hot press molded articles, press molded article, die mold and mold set

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0285] Next, the present application will be further described while showing examples. It should be noted that the present application is not limited to the examples shown below.

[0286] "Manufacturing of plated steel sheets"

[0287]

[0288] In a cold-rolled steel sheet with a thickness of 1.6mm (by mass%, C: 0.21%, Si: 0.12%, Mn: 1.21%, P: 0.02%, S: 0.012%, Ti: 0.02%, B: 0.03%, Al: 0.04% and the remainder: Fe and impurities) were used to form Al plating layers on both sides by Sen's strip nitriding dip galvanizing method. The annealing temperature was set at about 800° C., and the Al plating bath contained 9% by mass of Si and Fe eluted from the cold-rolled steel sheet. The deposition amount (weight per unit area) of the Al plating layer after plating is adjusted by the gas wiping method, and the deposition amount (weight per unit area) of the Al coating layer formed on both sides (upper surface and lower surface) of the cold-rolled steel sheet is set as 40g / m 2 Afte...

Embodiment A-

[0295] "Manufacturing of punching dies"

[0296] ·Base material

[0297] Prepare steels of the materials listed in Table 1, rough machine them in the annealed state, and Figure 8 The approximate shape of the upper mold 102A and the lower mold 102B shown in , is maintained by heating at 1180°C in vacuum, quenched by nitrogen cooling, and quenched and tempered to 64HRC by tempering at 540-580°C. After that, finish machining is performed to obtain the base material of the die.

[0298] ・Formation of nitride layer

[0299] Next, a nitride layer was formed on the steel plate contact surfaces of the upper mold 102A and the lower mold 102B that contact (slide) the plated steel sheet 10 .

[0300] The above base material was subjected to ion nitriding treatment under the conditions shown below. That is, with a flow ratio of 5% N 2 (remainder is H 2 ) in an atmosphere of 500° C. for 5 hours to perform ion nitriding treatment, and then finish machining by polishing each test surf...

Embodiment 1

[0304] According to the method described in the above-mentioned "making of punch die", the composition of the PVD film is set to the composition described in the following Table 2, and the hardness of the PVD film is adjusted so as to become the value described in the following Table 2, Die dies (upper die 102A and lower die 102B) were produced.

[0305] The deflection (Rsk) in the sliding direction of the plated steel sheet 10 in contact (sliding) was measured by the method described above for the steel sheet contact surface of the obtained die. Moreover, the hardness Hv_Die was measured by the method mentioned above about the steel plate contact surface of the obtained die|die.

[0306] Using the plated steel sheets and dies shown in Table 2, evaluations described below were implemented.

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Abstract

The present invention relates to a production method for hot press molded articles, whereby a die mold 11 is used to perform hot press molding on an Al-plated steel plate 10 having a zinc compound layer or a metal zinc layer as the outermost layer upon an Al plating layer. The die mold 11 has a hard layer 11C having a skewness (Rsk) of no more than 1.3 and a hardness Hv_Die of at least 2000 HV, asmeasured in a direction from the outside of a die hole 11D towards the inside, the hard layer 11C is the entire area adjacent to a die shoulder 11B out of a metal plate contact surface 11A that is asurface on the outside of the die hole 11D and in contact with the Al-plated steel plate 10 prior to hot press molding.

Description

technical field [0001] The present application relates to a manufacturing method of a thermoformed product, a press-formed product, a die and a mold set. Background technique [0002] In recent years, in order to protect the environment and prevent global warming, there has been an increasing demand to suppress the consumption of chemical fuels. This requirement affects various manufacturing industries. Automobiles are no exception, and improvements in fuel efficiency due to weight reduction of vehicle bodies and the like are required. However, in the case of automobiles, it is necessary to balance the weight reduction and safety of the vehicle body. [0003] The body structure of automobiles is mostly formed of iron, especially steel plates. To reduce the weight of the vehicle body, it is required to maintain the strength of the structural material provided by the steel plate and reduce the weight. Such a demand for steel sheets is considered the same not only in the au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/01B21D22/20B21D24/00C21D1/18C21D9/00C23C28/00C22C38/00C22C38/14
CPCC22C38/00C22C38/14C21D8/005C21D1/673B32B15/012B32B15/013C21D8/0436C21D8/0473C21D9/48C21D9/0068C21D1/25C21D1/74C21D1/613C21D1/76B21D22/022B21D22/208B21D53/88C23C28/04C23C28/321C23C28/345C23C2/12C23C2/28C23C2/26C23C8/02C23C8/10C23C8/12C23C8/14C22C38/02C22C38/04C23C28/021C23C28/023C23C28/322B21D35/007B21D22/201C23C2/29B21D37/01B21D22/20B21D24/00C21D1/18C21D9/00C23C28/00C22C38/002
Inventor 久保雅宽藤田宗士中泽嘉明入川秀昭布田雅裕
Owner NIPPON STEEL CORP
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