Press forming method and press forming device
A technology for stamping and forming products, applied in the field of stamping and stamping equipment, can solve the problems of long-term production period, and achieve the effect of reducing residual stress and reducing torsion
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no. 1 approach
[0061] The press forming method of the first embodiment of the present invention is to have Figure 14 The press forming method for forming the molded product 31 of the product shape shown is characterized in that, as figure 1 As shown, it has: the first forming process (refer to figure 1 (a)~ figure 1 (c)), the punch bottom portion 31a and the vertical wall portion 31b are formed into the product shape of the molded product 31 by the die 3 and the punch 5 up to the first bottom dead center, and the outer flange portion 31c and the inner flange portion 31d, so that the line length in the longitudinal direction of the outer flange portion 31c is shorter than the line length of the flange portion of the molded product 31 and the line length in the longitudinal direction of the inner flange portion 31d is longer than the line length of the flange portion of the molded product 31. Forming in a manner; and the second forming process (refer to figure 1 (d)) The outer flange porti...
no. 2 approach
[0083] In the first embodiment, an example in which the press forming apparatus 1 has the die 3, the punch 5, and the flange forming die 7 has been described. Figure 6 Like the press forming apparatus 10 shown, a pad 9 is provided to clamp the blank 23 at a portion corresponding to the punch bottom 31a in cooperation with the punch 5, and clamps the blank 23 from the start of the first forming process. Thereby, it is possible to reliably prevent the shifting of the blank 23 in the first forming step. It should be noted that, in Figure 6 In the press forming device 10, for the figure 1 The same structure of the press forming device 1 is denoted by the same reference numeral.
no. 3 approach
[0085] In the first and second embodiments, an example in which strain is applied to both the inner flange 31d and the outer flange 31c has been described, but it is only necessary to balance the residual stress between the inner flange 31d and the outer flange 31c. However, springback may be moderated for the molded product 31 as a whole, and molding may be performed such that strain is applied only to one of the inner flange portion 31d or the outer flange portion 31c. For example, in the case of a return where strain is applied only to the inner flange portion 31d, as Figure 7 As shown, press forming is performed using a punch 11 having an outer flange forming portion 11 a and a press forming device 15 having an inner flange forming die 13 .
[0086] The punch 11 forms the punch bottom 31 a, the vertical wall portion 31 b, and the outer flange portion 31 c together with the die 3 . The other structures of the press forming device 15 are the same as the press forming devic...
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Abstract
Description
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