Stamping forming method, method of manufacturing stamped product, and stamping forming device
A stamping forming and product technology, which is applied in the field of stamping forming molds and stamping forming devices, can solve the problems of product shape limitation and achieve the effect of preventing bending return
Inactive Publication Date: 2018-03-06
JFE STEEL CORP
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Problems solved by technology
However, in this technology, since a concave shape is formed on the top of the arc-shaped curved portion as shown in the embodiment, not only the product shape is limited, but also a post-orthopedic process is required when the concave shape is not required. Shape Correction Process
Method used
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Embodiment Construction
[0042] use figure 2 A press forming die consisting of an upper die and a lower die having a shape corresponding to each product shape as shown is press-formed from a flat blank figure 1 In the case of a product that is usually formed into a hat-shaped or U-shaped cross-sectional shape and is bent in the longitudinal direction as shown, tensile stress occurs on the outside of the bend and compressive stress occurs on the inside in the longitudinal direction of the product. Stress difference produces residual bending moment, so as image 3 As shown in , a phenomenon called bending back occurs in which the radius of curvature of the curved portion shown by the solid line becomes larger than the molded shape shown by the dotted line at the bottom dead center of the upper mold after demolding. This phenomenon is one type of springback deformation, and in a steel sheet, the higher the strength of the steel sheet, the larger the return amount becomes.
[0043] As one of the method...
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[Task] It is to provide a press forming method capable of forming a product having a hat type or a channel type cross-sectional shape and curved in a longitudinal direction in a good dimensional accuracy. [Solution] There is a press forming method wherein both ends of a blank having a length longer than a length along a longitudinal direction of a product to be formed are first approached to each other up to a distance between both ends of the product; portions of the blank corresponding to the straight portions of the product is press formed to a hat type or channel type cross-sectional shape prior to a portion of the blank corresponding to the curved portion of the product at an approached state of the both ends to thereby leave a surplus in a length of the portion of the blank corresponding to the curved portion of the product as compared to a length of the curved portion; then the portion of the blank corresponding to the curved portion of the product is press formed to a longitudinal curved shape at a state of leaving the surplus while forming the hat type or channel type cross-sectional shape to thereby apply a longitudinal compression stress to the portion of the blank corresponding to curved portion of the product.
Description
technical field [0001] The present invention relates to press forming of a hat-shaped or U-shaped cross-sectional product using a metal plate, and more particularly to a press forming method of a product bent in the longitudinal direction when viewed from the vertical wall direction (side) and as a stamped product The manufacturing methods and the stamping forming devices used in these methods are stamping forming dies. Background technique [0002] In the press forming of metal sheets, the molded product after demolding may have springback deformation due to elastic recovery, and the dimensional accuracy of the product caused by this may become a problem. In recent years, especially in automotive structural products, the use of thin high-strength steel sheets or aluminum alloy sheets has increased in order to reduce the weight of the car body. These materials have large springback deformation and poor dimensional accuracy. [0003] As the dimensional accuracy of the cross ...
Claims
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IPC IPC(8): B21D22/26B21D24/00
CPCB21D11/08B21D22/06B21D22/26
Inventor 新宫丰久山崎雄司饭冢荣治
Owner JFE STEEL CORP