# US 8,769,790 B2 · Multi-piece self pierce rivet die for improved die life

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,769,790 B2
- Document ID: US8769790B2
- Status: Granted
- Kind: B2
- Application number: 13/467,538
- Filed: 2012-05-09
- Published: 2012-09-20
- Granted: 2014-07-08
- Earliest claimed: 2004-08-24
- Assignees: Ford Global Technologies, LLC
- Applicants: Stephen Kernosky
- Inventors: Stephen Kernosky
- Web page: https://patentgrep.com/patent/US8769790B2

## CPC

- B21J 15/025: {Setting self-piercing rivets}
- B21J 15/10: Riveting machines (electric heating elements H05B)
- B21J 15/36: Rivet sets, i.e. tools for forming heads; Mandrels for expanding parts of hollow rivets
- Y10T 29/5343: Means to drive self-piercing work part
- Y10T 29/53709: Overedge assembling means
- Y10T 29/5377: Riveter
- B21J: FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES (rolling of metal B21B; making particular products by forging or pressing B21K; cladding or plating B23K; finishing surfaces by hammering B23P9/04; compacting surfaces by blasting with particulate material B24C1/10; general features of presses, presses for consolidating scrap B30B; furnaces in general F27)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A multi-piece die and system for driving a self pierce rivet into a plurality of workpieces. The die includes an anvil and a collar affixed to the anvil. The anvil and collar cooperate to reduce stresses to reduce breaking of the die.

## Claims

### Claim 1

A die for shaping a self-pierce rivet, comprising:
a one piece anvil that is disposed along an axis and includes:
a first portion that has a first perimeter surface;
a second portion that is coaxially disposed with the first portion, the second portion having an end surface and a second perimeter surface that extends from the end surface; and
a flange portion having an upper surface and a lower surface disposed opposite the upper surface, wherein the upper and lower surfaces extend from the first and second perimeter surfaces, respectively, and away from the axis; and
a collar fixedly disposed on the anvil, the collar having an interior surface, an exterior surface disposed opposite the interior surface, and a mating surface that extends from the interior surface to the exterior surface;
wherein the interior surface of the collar engages the second perimeter surface and the mating surface of the collar engages the upper surface of the flange portion.

### Claim 2 (depends on 1)

The die of claim 1 wherein the interior surface defines a hole that is configured to receive the self-pierce rivet when the self-pierce rivet is driven into a plurality of workpieces.

### Claim 3 (depends on 1)

The die of claim 1 wherein the interior and exterior surfaces are concentrically disposed about the axis.

### Claim 4 (depends on 1)

The die of claim 1 wherein the second perimeter surface extends from the end surface to the upper surface.

### Claim 5 (depends on 4)

The die of claim 4 wherein the second perimeter surface is disposed substantially parallel to the axis.

### Claim 6 (depends on 1)

The die of claim 1 wherein the first and second perimeter surfaces are coaxially disposed and located at a common radial distance from the axis.

### Claim 7 (depends on 1)

The die of claim 1 wherein the end surface is disposed generally perpendicular to the interior surface.

### Claim 8 (depends on 1)

The die of claim 1 wherein the upper and lower surfaces of the flange portion extend substantially parallel to each other.

### Claim 9 (depends on 1)

The die of claim 1 wherein the upper surface extends at an angle with respect to the lower surface such that the upper surface is located closer to the lower surface as a distance from the axis increases.

### Claim 10 (depends on 1)

The die of claim 1 wherein the upper surface extends at an angle with respect to the lower surface such that the upper surface is located closer to the lower surface as a distance from the axis decreases.

### Claim 11 (depends on 1)

The die of claim 1 wherein the upper surface is convex.

### Claim 12 (depends on 1)

The die of claim 1 wherein the upper surface is concave.

### Claim 13 (depends on 1)

The die of claim 1 wherein the end surface has a conical configuration.

### Claim 14 (depends on 1)

The die of claim 1 wherein the interior surface and second perimeter surface include mating threads.

### Claim 15 (depends on 1)

The die of claim 1 wherein the end surface has a nub that protrudes from the end surface.

### Claim 16 (depends on 1)

The die of claim 1 wherein the anvil has a hardness of about 60 to 62 RC and the collar has a hardness of about 56-58 RC.

### Claim 17 (depends on 1)

The die of claim 1 wherein the collar does not move with respect to the anvil.