# US 9,434,110 B2 · Method of manufacturing unevenness shaped Z-pin and Z-pin manufactured using the same and composite structure including the Z-pin

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- Number: US 9,434,110 B2
- Document ID: US9434110B2
- Status: Granted
- Kind: B2
- Application number: 14/086,161
- Filed: 2013-11-21
- Published: 2015-01-22
- Granted: 2016-09-06
- Earliest claimed: 2013-07-17
- Assignees: Korea Aerospace Research Institute
- Applicants: Korea Aerospace Research Institute
- Inventors: Ik Hyeon Choi; Cheol Ho Lim; Eun Sup Sim
- Web page: https://patentgrep.com/patent/US9434110B2

## CPC

- B29C 70/24: oriented in at least three directions forming a three-dimensional [3D] structure
- B29C 37/0082: {Mechanical anchoring (B29C66/303 takes precedence)}
- Y10T 29/49: Method of mechanical manufacture
- Y10T 428/2976: Longitudinally varying
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are a method of manufacturing a Z-pin having an unevenness shape formed on a surface thereof so as to economically and effectively increase coupling force in the Z-pin for coupling of a composite material laminated structure in a laminated direction, and a Z-pin manufactured using the same and a composite structure including the Z-pin.

## Claims

### Claim 1

A method of manufacturing a Z-pin having an uneven surface used for Z-pinning of a composite material laminated structure, comprising:
forming a pillar shaped body by an extruding process, the pillar shaped body having a length and a cross-section;
preparing a gear-shaped press-fitting forming jig having gear teeth formed along a circumference of the gear-shaped press-fitting forming jig;
pressing and rotating the gear shaped press-fitting forming jig on the pillar shaped body along a longitudinal direction thereof to form an unevenness pillar shaped body having an uneven surface, thereby forming unevenness in a surface of the pillar shaped body by the gear teeth; and
cutting the unevenness pillar shaped body at an inclined angle with respect to the longitudinal direction thereof into a plurality of Z-pins each having the uneven surface and a predetermined length, at least one end portion of each of the Z-pins having a sharp distal end.

### Claim 2 (depends on 1)

The method of claim 1, wherein the gear-shaped press-fitting forming jig includes at least one pair of press-fitting forming jigs facing each other.

### Claim 3 (depends on 1)

The method of claim 1, wherein the gear-shaped press-fitting forming jig includes at least two sets of press-fitting forming jigs, each set of the press-forming jigs facing each other, the gear teeth in the press-forming jigs having different angles with respect to the longitudinal direction of the pillar shaped body.

### Claim 4 (depends on 3)

The method of claim 3, wherein the at least two press-fitting forming jigs are disposed to be perpendicular to each other when viewed in the longitudianl direction of the pillar shaped body.

### Claim 5 (depends on 1)

The method of claim 1, wherein the gear teeth have different shapes.

### Claim 6 (depends on 1)

The method of claim 1, wherein the gear teeth have a symmetrical shape or an asymmetrical shape.