Drilling processing method using press

Patent metadata

Field	Value
Publication number	US-11945018-B2
Application number	US-202117537685-A
Country	US
Kind code	B2
Filing date	Nov 30, 2021
Priority date	Dec 21, 2020
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

In drilling processing on a press-formed inclined portion, a hole is formed with high precision without occurrence of damage to a blade of a punch or slipping of the punch. Embodiments include a method where two through holes are formed in a blank before press-forming which are opposed to each other in the inclined direction of the inclined portion, each through portion partially forming a peripheral edge portion of the hole. The inclined portion is formed using press processing on the blank. Piercing processing using a punch is performed while pressing the inclined portion, so that the two opposed through holes are connected, thereby forming the hole.

First claim

What is claimed is:

1. A drilling processing method using a press for forming an inclined portion inclined with respect to a press direction using press processing on a blank, and forming a hole in the inclined portion, the method comprising:
forming at least two through portions in the blank which are opposed to each other in an inclined direction of the inclined portion, each of the through portions partially forming a peripheral edge portion of the hole;
forming the inclined portion using the press processing on the blank; and
performing piercing processing using a punch while pressing the inclined portion so that the at least two opposed through portions are connected, thereby forming the hole.

2. The drilling processing method using the press according to claim 1 , wherein in the piercing processing, the punch is advanced in the press direction for the blank when forming the inclined portion.

3. The drilling processing method using the press according to claim 2 , wherein each through portion is a through hole formed using piercing processing.

4. The drilling processing method using the press according to claim 2 , wherein the through portions are formed simultaneously with the blank.

5. The drilling processing method using the press according to claim 2 , wherein the blank comprises a high tensile steel plate.

6. The drilling processing method using the press according to claim 1 , wherein each through portion is a through hole formed using piercing processing.

7. The drilling processing method using the press according to claim 1 , wherein the through portions are formed simultaneously with the blank.

8. The drilling processing method using the press according to claim 1 , wherein the blank comprises a high tensile steel plate.

9. The drilling processing method using the press according to claim 1 , comprising forming the hole using a press-forming apparatus including a lower die for press-forming, an upper die for press-forming, the punch, and a punch holder that fixes the punch to an upper die plate.

10. The drilling processing method using the press according to claim 9 , wherein a lower face side of the lower die has a lower forming face for forming a formed product including the inclined portion from the blank, and an upper face side of the upper die has an upper forming face for forming the formed product, and
wherein the lower forming face and the upper forming face are each inclined with respect to the press direction such that the inclined portion is formed by the lower forming face and the upper forming face.

11. The drilling processing method using the press according to claim 1 , wherein the punch is a cornered punch disposed between the opposed through portions, such that punching of the space between the opposed through portions using the punch forms the hole, and the hole has upper and lower hole portions derived from the opposed through portions and connected by a slot portion.

12. The drilling processing method using the press according to claim 1 , comprising forming, from the blank, a steel inner reinforcement of a B pillar which is located between a front seat of an automobile and a rear seat thereof and extends from a side sill to a roof rail.

Assignees

• Mazda Motor

Inventors

• Matsumoto Shigeru

Classifications

• B21D28/02 Primary

  Punching blanks or articles with or without obtaining scrap (cutting nails or pins from strips or sheet material B21G3/26); Notching · CPC title

• B23B35/00

  Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods · CPC title

• B21D28/26 Primary

  in sheets or flat parts · CPC title

• B21D28/32 Primary

  in other articles of special shape · CPC title

• B21D53/88

  other parts for vehicles, e.g. cowlings, mudguards · CPC title