公开(公告)号：US20020068108A1

公开(公告)日：2002-06-06

申请号：US09998214

申请日：2001-12-03

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

Inventor： Jiro Iwaya

IPC: B29C051/08

CPC classification number: B21D22/02 ,  B21D11/18

Abstract: A press die composed of an upper die having a concave part (with the peripheral surface of the opening of said concave part functioning as a first blank pressing face), a lower die having a convex part (to form the blank into a desired form in cooperation with said concave part), and a blank holder (which has a second blank pressing face), said press die working in such a way that said first blank pressing face and said second blank pressing face hold a blank between them while permitting it to flow into said concave part during pressing, characterized in that at least either of said first blank pressing face and said second blank pressing face has a roughened surface with a plurality of striated projections which are formed in the direction inclined in a range of null25null to null25null (preferably approximately parallel) toward the circumferential direction of the edge of the opening of said concave part. The press die permits the blank to slide easily and hence prevents the blank from decreasing in thickness during press forming.

Abstract translation: 由具有凹部（具有作为第一坯料挤压面的所述凹部的开口的周面）的上模组成的压模，具有凸部的下模（将坯料形成为期望的形式） 与所述凹部配合）和坯料夹具（其具有第二坯料挤压面），所述压模以使得所述第一坯料挤压面和所述第二坯料挤压面在它们之间保持空白的方式加工， 在压制过程中流入所述凹部，其特征在于，所述第一坯料挤压面和所述第二坯料挤压面中的至少一个具有粗糙表面，所述粗糙表面具有多个条纹突起，所述多个条纹突起沿倾斜在-25° 到所述凹部的开口的边缘的圆周方向为+ 25°（优选近似平行）。 压模允许坯料容易地滑动，从而防止坯料在压制成形期间厚度减小。

公开(公告)号：US20040244458A1

公开(公告)日：2004-12-09

申请号：US10790755

申请日：2004-03-03

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.)

Inventor： Takayuki Yamano ,  Jiro Iwaya

IPC: B21D022/21

CPC classification number: B21D22/22 ,  B21D5/01 ,  B21D25/02

Abstract: A die set for press forming a metal sheet is provided, which comprises: at least a punch; and a die, wherein a punch-die clearance CL2 corresponding to a site to be formed immediately after the initial stage of press forming and a punch-die clearance CL1 corresponding to a site to be formed in the initial stage of press forming are set so as to satisfy the following expressions (1) and (2), respectively: 0.8nulltnullCL1null1.2nullt nullnull(1) CL2nullCL1nullt nullnull(2) where t denotes the thickness of the metal sheet to be formed. This configuration implements a die set for press forming capable of stably generating the reverse bending deformed portion due to overrun even when the die radius is large, minimizing the phenomenon such as wall warp, and enhancing the dimensional accuracy in press forming of a metal sheet, and a press forming method using the die set.

Abstract translation: 提供了一种用于压制成型金属片的模具，其包括：至少一个冲头; 以及模具，其中对应于在冲压成形初始阶段之后立即形成的冲压模具间隙CL2和与在冲压成型初始阶段形成的部位相对应的冲压模间隙CL1设定为 满足以下表达式（1）和（2）：0.8xt <= CL1 <= 1.2Xt（1）CL2> = CL1 + t（2）其中t表示待形成的金属片的厚度。 该构造实现了即使在模半径大的情况下也能够由于超越而稳定地产生反向弯曲变形部的冲压成形用模具，能够将壁翘曲等现象最小化，提高金属板的压制成形时的尺寸精度， 以及使用该模具的压制成形方法。

公开(公告)号：US20030061852A1

公开(公告)日：2003-04-03

申请号：US10253879

申请日：2002-09-25

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd)

Inventor： Takayuki Yamano ,  Jiro Iwaya

IPC: B21D011/00

CPC classification number: B21D5/01

Abstract: Disclosed is a method for bending a metal plate comprising: a first forming step (A) for obtaining a first formed member having a bent portion; and a second forming step (B) for bending the first formed member in a direction of a bending direction of the bent portion so as to allow the bent portion of the first formed member to receive bending-back force. In bending a metal plate by a forming punch relatively moving to a forming die side, the metal plate is bent in an arch shape round the bent forming portion of the forming die. The angle nullp formed between an inclined flat forming portion and a horizontal flat forming portion of the forming die is set to nullp>0, so that the bent arch portion abuts with the inclined flat forming portion of the forming punch and the inclined flat portion of the forming die simultaneously for a certain period of time. This reduces the angle change defect of the bent portion of the formed portion, with no need of changing product shape or of preparing for a special forming die or a facility.

Abstract translation: 公开了一种用于弯曲金属板的方法，包括：第一形成步骤（A），用于获得具有弯曲部分的第一成形构件; 以及第二形成工序（B），用于沿着弯曲部的弯曲方向的方向弯曲第一成形构件，以允许第一成形构件的弯曲部接收弯曲力。 在通过相对移动到成型模具侧的成型冲头弯曲金属板的情况下，金属板在成形模具的弯曲成形部分周围弯曲成弓形。 形成在成形模具的倾斜平坦形成部分和水平平面形成部分之间的角度被设定为大于零，使得弯曲的拱形部分与成形冲头的倾斜平坦形成部分相邻，并且倾斜的平坦部分 成型模具同时进行一段时间。 这样可以减少成形部分的弯曲部分的角度变化缺陷，而不需要改变产品形状或为特殊成型模具或设备的准备。