Method and device for manufacturing bearing unit
US-2018202495-A1 · Jul 19, 2018 · US
Roller hemming
US9440278B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9440278-B2 |
| Application number | US-201313797762-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 12, 2013 |
| Priority date | Nov 30, 2012 |
| Publication date | Sep 13, 2016 |
| Grant date | Sep 13, 2016 |
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- Title
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- Abstract
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- First independent claim
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Abstract
Official abstract text for this publication.
Methods and apparatuses for roller hemming are disclosed herein. An example of a sheet metal roller hemming apparatus includes a first electrode to electrically connect to an electrical power supply and a sheet metal workpiece. The apparatus further includes a second electrode to electrically connect to the electrical power supply and the sheet metal workpiece to cause pulsed electric current to flow through a portion of the workpiece to locally increase formability in the portion of the workpiece. The apparatus still further includes a roller assembly to contact the workpiece to cause the workpiece to bend in the portion of the workpiece when the pulsed electric current is flowing through the portion of the workpiece, and to form a hem.
First claim
Opening claim text (preview).
The invention claimed is: 1. A sheet metal roller hemming apparatus, comprising: a first electrode to electrically connect to an electrical power supply and a sheet metal workpiece, wherein the first electrode is a busbar including an electrical conductor positioned to be in electrical contact with the workpiece; a second electrode to electrically connect to the electrical power supply and the sheet metal workpiece to cause pulsed electric current having a pulse frequency from about 100 Hz to about 1000 Hz to flow through a portion of the workpiece to locally increase formability in the portion of the workpiece via an electroplasticity effect and to form a hem, wherein the second electrode is a roller assembly; and rubber insulation components positioned between the busbar and a die form that supports the busbar, wherein the rubber insulation components include a rubber cylinder and two rubber busbar side walls placed within the die form to electrically isolate the busbar from the die form and wherein the rubber cylinder urges the busbar into contact with the sheet metal workpiece. 2. The sheet metal roller hemming apparatus as defined in claim 1 wherein the busbar is clamped to the workpiece.
Assignees
Inventors
Classifications
Heating or cooling · CPC title
for flanging edges of plates · CPC title
- B21D39/023Primary
using rollers · CPC title
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Frequently asked questions
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- What does patent US9440278B2 cover?
- Methods and apparatuses for roller hemming are disclosed herein. An example of a sheet metal roller hemming apparatus includes a first electrode to electrically connect to an electrical power supply and a sheet metal workpiece. The apparatus further includes a second electrode to electrically connect to the electrical power supply and the sheet metal workpiece to cause pulsed electric current t…
- Who is the assignee on this patent?
- Gm Global Tech Operations Llc, Univ Shanghai Jiaotong, Gm Global Tech Operations Llc
- What technology area does this patent fall under?
- Primary CPC classification B21D39/023. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Sep 13 2016 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).