Manufacturing method of press-molded products

By using dual mold technology during stamping, adjusting the friction characteristics of the mold surface and using different lubricants to control the friction coefficient, the problem of side wall rupture of the steel plate material during hot processing is solved, and higher molding limits and mechanical properties are achieved.

JP7648340B2Active Publication Date: 2025-03-18NIPPON STEEL CORPORATION +1
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Patent Information

Application Number
JP2020017229
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-02-04
Publication Date
2025-03-18
Estimated Expiration
2040-02-04

AI Technical Summary

Technical Problem

During the hot processing process, steel plate materials are prone to cracking or cracking of side walls due to excessive stress caused by friction and friction during stamping, and the prior art is difficult to effectively control this problem.

Method used

The dual mold technology is adopted, where the friction coefficient (μ1) of the first mold is smaller than the friction coefficient (μ2) of the second mold. By adjusting the friction characteristics of the mold surface and using different lubricants to control the friction coefficient, ensuring that appropriate friction forces are applied at the connection between the side wall and the bottom surface during the stamping process to avoid rupture.

Benefits of technology

It effectively suppresses the cracking and cracking of the side wall during stamping, improves the forming limit of stamped products, and ensures the mechanical properties of the products.

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Abstract

To provide a manufacturing method for a press molded article in which fracture and crack of a side wall part with respect to a bottom surface part can be suppressed in molding a press molded article having the bottom surface part and the side wall part.SOLUTION: In the manufacturing method for a press molded article 10, first molds 31 have first mold surfaces 31a that contact a first molding surface 22a of a portion that becomes a side wall part 12, and a second mold 32 has a second molding surface 32b that contacts a second molding surface 22b of a portion that becomes the side wall part 12, where in hot-ironing the portion that becomes the side wall part 12 by the first molding surfaces 31a and the second molding surface 32b, by moving the first mold surfaces in a direction in which the surfaces separate from a bottom surface part relatively with respect to the first molding surface and by moving the second mold surface in a direction in which the surface approaches the bottom surface part relatively with respect to the second molding surface, a coefficient μ1 of a friction between the first mold surface 31a and the first molding surface 22a and a coefficient μ2 of a friction between the second mold surface 32b and the second molding surface 22b satisfy the following formula (1): μ1<μ2 (1).SELECTED DRAWING: Figure 4
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