Automotive chassis part made from high strength formable hot rolled steel sheet
US-2015099139-A1 · Apr 9, 2015 · US
Burring processing method
US10384251B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10384251-B2 |
| Application number | US-201615555656-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 9, 2016 |
| Priority date | Mar 11, 2015 |
| Publication date | Aug 20, 2019 |
| Grant date | Aug 20, 2019 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
In performing burring processing on a sheet-like member, the following processes are performed: a punching process of performing punching processing of the sheet-like member; a hole expansion process of performing hole expansion processing of a punched hole formed by the punching process; a re-punching process of performing punching processing again on a portion surrounding the punched hole expanded by force in the hole expansion process; and a burring process of pushing a portion surrounding a re-punched hole that is a punched hole formed by the re-punching process and forming a vertical wall.
First claim
Opening claim text (preview).
The invention claimed is: 1. A burring processing method of a sheet member, comprising: a punching process of performing punching processing of the sheet member; a hole expansion process of performing hole expansion processing of a punched hole formed by the punching process by putting and fixing the sheet member around the punched hole between a die and a holder; a re-punching process of performing punching processing again on a portion surrounding the punched hole expanded by force in the hole expansion process; and a burring process of pushing a portion surrounding a re-punched hole that is a punched hole formed by the re-punching process and forming a vertical wall wherein the punching process performs a punching processing of the sheet member to form a hole of a particular diameter, and the re-punching process performs punching processing again on a portion surrounding the punched hole expanded by force in the hole expansion process removes material around the hole to form a hole with a greater diameter. 2. The burring processing method according to claim 1 , wherein, in the re-punching process, the portion surrounding the punched hole is punched such that a surface in which the punched hole is formed after finishing of the hole expansion process remains. 3. The burring processing method according to claim 1 , wherein the sheet member is a high-tensile steel sheet. 4. The burring processing method according to claim 1 , wherein the sheet member is a hot rolled steel sheet. 5. The burring processing method according to claim 1 , wherein, in the burring process, the vertical wall is formed such that a vertical wall angle is perpendicular to a basal plane of the sheet member. 6. The burring processing method according to claim 1 , wherein, in the punching process, at least either one of machining processing and laser processing is performed as finish processing of the punched hole. 7. The burring processing method according to claim 1 , wherein, in the re-punching process, at least either one of machining processing and laser processing is performed as finish processing of the re-punched hole.
Assignees
Inventors
Classifications
- B21D19/08Primary
by single or successive action of pressing tools, e.g. vice jaws · CPC title
in sheets or flat parts · CPC title
for flanging holes · CPC title
Shoulder or burr prevention {, e.g. fine-blanking} · CPC title
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Frequently asked questions
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- What does patent US10384251B2 cover?
- In performing burring processing on a sheet-like member, the following processes are performed: a punching process of performing punching processing of the sheet-like member; a hole expansion process of performing hole expansion processing of a punched hole formed by the punching process; a re-punching process of performing punching processing again on a portion surrounding the punched hole exp…
- Who is the assignee on this patent?
- Nippon Steel & Sumitomo Metal Corp, Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification B21D19/08. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 20 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).