Draw forming method

Patent metadata

Field	Value
Publication number	US-9592544-B2
Application number	US-201314655176-A
Country	US
Kind code	B2
Filing date	Dec 25, 2013
Priority date	Dec 26, 2012
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A draw bead is formed in a plate-shaped material in which a drawn portion is formed, outside the drawn portion, the draw bead being used to adjust an inflow of the plate-shaped material into a drawing die. The drawn portion is drawn in the plate-shaped material by using the draw bead as formed. The draw bead is crushed and flattened after the drawn portion is drawn.

First claim

The invention claimed is:

1. A drawing method comprising steps in the following order:
forming a draw bead in a plate-shaped material, in which a drawn portion is to be formed, outside the drawn portion, the draw bead being used to adjust an inflow of the plate-shaped material into a drawing die;
forming the drawn portion in the plate-shaped material by using the draw bead as formed;
crushing and substantially flattening the draw bead using a die such that an entire bottom surface of the flattened draw bead contacts the die; and
removing a portion in the plate-shaped material outside of the drawn portion such that at least part of the crushed and substantially flattened draw bead is left.

2. The drawing method according to claim 1 , wherein, when the draw bead is crushed and substantially flattened, the draw bead is crushed by press work at a pressure greater than a pressure applied to the draw bead when the drawn portion is formed by press-forming.

3. The drawing method according to claim 1 , wherein, when the draw bead is crushed, a pressure is applied only to the draw bead in the plate-shaped material outside the drawn portion.

4. The drawing method according to claim 1 , wherein, after the draw bead is crushed and substantially flattened, the draw bead as crushed is joined to a flange of a different member.

5. The drawing method according to claim 4 , wherein, in the step of joining the draw bead as crushed to the flange of the different member, the draw bead as crushed is joined to the flange of the different member by spot welding.

Assignees

• Nissan Motor

Inventors

• Inoue Seiji
• Matsuno Yusuke
• Murakami Yasushi

Classifications

• B21D22/26

  for making peculiarly, e.g. irregularly, shaped articles · CPC title

• B21D35/002 Primary

  Processes combined with methods covered by groups B21D1/00 - B21D31/00 · CPC title

• B21D22/20

  Deep-drawing (special deep-drawing arrangements in, or in connection with, presses B21D24/00) · CPC title

• B21D22/22

  with devices for holding the edge of the blanks (B21D22/24 - B21D22/30 take precedence; shaping over a die without external former B21D11/02) · CPC title

• B23K31/02

  relating to soldering or welding · CPC title