Method for manufacturing press formed product
A manufacturing method and technology for molded products, which are applied in the field of stamping and molded product manufacturing, can solve problems such as stretch flange cracks, and achieve the effects of improving yield, suppressing poor molding, and reducing crack risk.
Pending Publication Date: 2020-08-21
JFE STEEL CORP
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- Abstract
- Description
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- Application Information
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Problems solved by technology
In this case, tensile flange cracks are likely to occur from the edge of the sheared end face formed in the trimming process or punching process
Method used
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Effect test
Embodiment 1
[0066] In order to confirm the effect of improving the stretch flange formability by the press forming method of the present invention, the test piece for the hole expansion test was partially heated and air-cooled, and then the hole expansion test was carried out. The results are described below.
[0067] In this example, through image 3 The hole expansion test is shown to evaluate the stretch flange formability. image 3 Among them, the symbol 20 represents the material of the seed plate, the symbol 30 represents the die, the symbol 31 represents the seed plate support, and the symbol 32 represents the punch.
[0068] First, if Figure 4 As shown, for a 100[mm]×100[mm] square seed plate material, punch a hole of φ10[mm] in the center of the seed plate with a gap of 12%, and make a hole expansion test piece ( image 3 The seed plate material in 20). The metal plate constituting the seed plate material used in this example is a steel plate with a thickness of t=1.2 mm and...
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Abstract
Provided is a press formed product without forming defects wherein stretch flange cracks can be suppressed without making a mold shape complicated and without performing more heat treatment than necessary. A method for manufacturing a press formed product is a manufacturing method in which press processing (press processing step (4)) that includes stretch flange forming is implemented on a singlemetal plate obtained by implementing shear processing (shearing step (1)) on a metal plate formed from a single plate material. When regions where stretch flange cracks are presumed to easily occur when the single metal plate is press formed by the press processing are set as stretch flange crack regions, the press processing (press processing step (4)) is performed after heating and cooling (heating step (2) and cooling step 3 (3)) at least the metal plate end surfaces positioned within the stretch flange crack regions in the single metal plate obtained by the shear processing, from among themetal plate end surfaces and the vicinity thereof.
Description
technical field [0001] The present invention relates to a method of manufacturing a press-formed product produced by reducing the risk of stretch flange cracks when press-forming a metal plate and then performing press work. The present invention is a technique particularly applicable to the manufacture of body structural parts for automobiles. Background technique [0002] In recent years, in order to improve the crash safety and reduce the weight of the automobile body, high-tensile materials of 590 MPa or more have been applied to the structural parts of the automobile body. Due to the low hole expansion rate of high-tensile materials, forming defects such as stretch flange cracks become a problem when press forming. [0003] As one of the press-formed products used in the running parts of automobiles, there are, for example, structural parts having a curved shape in plan view such as lower arms. When such a component shape that is bent in plan view is processed by pres...
Claims
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IPC IPC(8): B21D22/20B21D19/00B21D22/26B21D37/16
CPCB21D19/00B21D22/20B21D22/26B21D37/16C21D1/30C21D9/46
Inventor 飞田隼佑新宫丰久山崎雄司
Owner JFE STEEL CORP