# US 2014/0196518 A1 · Cut-off end surface improvement

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- Number: US 2014/0196518 A1
- Document ID: US20140196518A1
- Status: Published application
- Kind: A1
- Application number: 13/741,557
- Filed: 2013-01-15
- Published: 2014-07-17
- Earliest claimed: 2013-01-15
- Assignees: The National Machinery Company
- Applicants: National Machinery LLC
- Inventors: Jeffrey W. Carper
- Web page: https://patentgrep.com/patent/US20140196518A1

## CPC

- B21K 27/06: Cutting-off means; Arrangements thereof
- B21F 5/00: Upsetting wire
- B21F 5/005: {Upsetting wire}
- B21J 1/02: Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough (modifying the physical properties by deformation C21D7/00, C22F1/00)
- B21J 9/022: {multi-stage forging presses (handling devices B21K27/00)}
- B21F 1/00: Bending wire other than coiling; Straightening wire
- B21K: MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS (making particular articles by working sheet metal without essentially removing material B21D; processing wire B21F; making pins, needles or nails B21G; making particular articles by rolling B21H; forging machines, pressing machines, hammering machines, in general B21J; making chains B21L; plating B23K)
- B21F: WORKING OR PROCESSING OF METAL WIRE (rolling of metal wire B21B1/16; by drawing, auxiliary operations used in connection with metal-working without essentially removing material B21C)
- 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)

## Abstract

A method of improving the surface finish of a sheared end face of a cylindrical blank in a progressive forming machine comprising deforming the end face out of its original as sheared transverse plane into a first shape concentric with the axis of the blank that slightly departs from the original plane a distance that increases with proximity to the axis of the blank, thereafter deforming the end face from the first shape into a second shape in a direction opposite a direction the first shape was displaced from the original shear plane, the second shape slightly departing from a transverse plane a distance that increases with proximity to the axis of the blank.

## Claims

### Claim 1

A method of improving the surface finish of a sheared end face of a cylindrical blank in a progressive forming machine comprising deforming the end face out of its original as sheared transverse plane into a first shape concentric with the axis of the blank that slightly departs from the original plane a distance that increases with proximity to the axis of the blank, thereafter deforming the end face from the first shape into a second shape in a direction opposite a direction the first shape was displaced from the original shear plane, the second shape slightly departing from a transverse plane a distance that increases with proximity to the axis of the blank.

### Claim 2 (depends on 1)

A method as set forth in claim 1, wherein the first and second shapes depart from a transverse plane at an angle between about 3 degrees to about 10 degrees.

### Claim 3 (depends on 1)

A method as set forth in claim 1, wherein the first and second shapes depart from a transverse plane at an angle of about 5 degrees.

### Claim 4 (depends on 1)

A method as set forth in claim 1, wherein the first shape is caused to be concave.

### Claim 5 (depends on 4)

A method as set forth in claim 4, wherein the first shape is a shallow cone.

### Claim 6 (depends on 4)

A method as set forth in claim 4, wherein the blank is formed with a taper at its end when the first shape is formed.

### Claim 7 (depends on 4)

A method as set forth in claim 4, wherein a centrally vented tool face is used to transform the blank end face from said concave shape to a convex shape.

### Claim 8 (depends on 7)

A method as set forth in claim 7, wherein said convex end face shape is flattened into a plane transverse to its axis.