Stock ejector assembly

Patent metadata

Field	Value
Publication number	US-10384259-B2
Application number	US-201615164938-A
Country	US
Kind code	B2
Filing date	May 26, 2016
Priority date	Apr 29, 2014
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A stock ejector assembly and method for metal forming dies includes a stock ejector with a large spring and a ring-style stripper. The ring-style stripper provides a larger surface area for contacting the stock. The large compression spring is preloaded and when a load is applied, the stripper retracts and the spring pressure increases. When the dies separate, the stock ejector pushes the part off flat surfaces, separating surfaces sealed by adhesion, including but not limited to oil or lubricant adhesion.

First claim

The invention claimed is:

1. In a multi-station progressive metal forming die having at least two mutually converging and diverging die members between which an elongate stock strip is shifted longitudinally to form parts from the stock strip, the improvement of a stock ejector assembly, comprising:
a stripper with an outer collar portion with an outer end surface oriented toward the stock strip and a first sidewall with a first outer width, an inner collar portion with an inner end surface oriented away from the stock strip and a second sidewall with a second outer width which is less than said first outer width of said first sidewall of said outer collar portion and defines a shoulder therebetween; wherein:
said outer collar portion has a first inner width;
said inner collar portion has a second inner width which is less than said first inner width of said outer collar portion and defines an inner shoulder therebetween;
said first outer width and said first inner width of said outer collar portion of said stripper form a surface for contacting the stock strip;

a flange nut having an outer end portion that is oriented toward the stock strip, an inner end portion that is oriented away from the stock strip, and a fastener aperture extending from the outer end portion through the inner end portion;
a spring member having a generally hollow interior that is received over said outer end portion of the flange nut and the inner collar portion of the stripper, an outer end oriented toward the stock strip that engages the shoulder of the stripper, and an opposite inner end oriented away from the stock strip that engages a surface of the inner end portion of the flange nut; and
a fastener that secures the assembly to one of the die members.

2. A metal forming die as set forth in claim 1 , including:
a washer that engages the shoulder of the stripper.

3. A metal forming die as set forth in claim 2 , wherein:
said inner collar portion of the stripper includes an aperture.

4. A metal forming die as set forth in claim 3 , wherein:
said fastener includes a head having an outer end portion oriented towards the stock strip and an inner end portion oriented away from the stock strip and a threaded shank portion that extends from said inner end portion of the head of the fastener.

5. A metal forming die as set forth in claim 4 , wherein:
at least a portion of said fastener aperture in said flange nut is threaded.

6. A metal forming die as set forth in claim 5 , wherein:
a portion of said outer end portion of the flange nut extends into the aperture of the inner collar portion of the stripper and the inner end portion of the head of the fastener engages a surface of said washer while the threaded shank portion of the fastener extends through the fastener aperture in the flange nut, and into a threaded aperture formed in said one die member to secure the assembly to said one die member.

7. A metal forming die as set forth in claim 1 , wherein:
said outer collar portion of said stripper includes a taper.

8. A stock ejector assembly for metal forming dies having at least two mutually converging and diverging die members between which parts are formed from a stock strip, comprising:
a stripper with an outer collar portion with an outer end surface oriented toward the stock strip and a first sidewall with a first outer width, an inner collar portion with an inner end surface oriented away from the stock strip and a second sidewall with a second outer width which is less than said first outer width of said first sidewall of said outer collar portion and a shoulder therebetween; wherein:
said outer collar portion has a first inner width;
said inner collar portion has a second inner width which is less than said first inner width of said outer collar portion and defines an inner shoulder therebetween;
said first outer width and said first inner width of said outer collar portion of said stripper form a surface for contacting the stock strip;

a flange nut having an outer end portion that is oriented toward the stock strip, an inner end portion that is oriented away from the stock strip, and a fastener aperture extending from the outer end portion through the inner end portion;
a spring member having a generally hollow interior that is received over said outer end portion of the flange nut and the inner collar portion of the stripper, an outer end oriented toward the stock strip that engages the shoulder of the stripper, and an opposite inner end oriented away from the stock strip that engages a surface of the inner end portion of the flange nut; and
a fastener.

9. A stock ejector assembly as set forth in claim 8 , including:
a washer that engages the shoulder of the stripper.

10. A stock ejector assembly as set forth in claim 9 , wherein:
said inner collar portion of the stripper includes an aperture that is formed by said second inner width of the inner collar portion.

11. A stock ejector assembly as set forth in claim 10 , wherein:
said fastener includes a head having an outer end portion oriented towards the stock strip and an inner end portion oriented away from the stock strip and a threaded shank portion that extends from said inner end portion of the head of the fastener.

12. A stock ejector assembly as set forth in claim 11 , wherein:
at least a portion of said fastener aperture in said flange nut is threaded.

13. A stock ejector assembly as set forth in claim 12 , wherein:
a portion of said outer end portion of the flange nut extends into the aperture of the inner collar portion of the stripper and the inner end portion of the head of the fastener engages a surface of said washer while the threaded shank portion of the fastener extends through the fastener aperture in the flange nut, and into a threaded aperture formed in said one die member to secure the assembly to said one die member.

14. A stock ejector assembly as set forth in claim 8 , wherein:
said outer collar is tapered to a surface for contacting the stock strip.

15. In a method for making a multi-station progressive metal forming die having at least two mutually converging and diverging die members between which an elongate stock strip is shifted longitudinally to form parts from the stock strip, with the improvement of at least one stock ejector assembly, comprising:
forming a stripper with an outer collar portion with an outer end surface oriented toward the stock strip and a first sidewall with a first outer width, an inner collar portion with an inner end surface oriented away from the stock strip and a second sidewall with a second outer width which is less than said first outer width of said first sidewall of said outer collar portion to define a shoulder therebetween, including:
forming said outer collar portion with a first inner width;
forming said inner collar portion with a second inner width which is less than said first inner width of said outer collar portion to define an inner shoulder therebetween, and an aperture that is formed by said second inner width of the inner collar portion;

selecting a flange nut with an outer end portion that is oriented toward the stock strip, an inner end portion that is oriented away from the stock strip, and a fastener aperture extending from the outer end portion through the inner end portion;
selecting a spring member with a generally hollow interior, an outer end oriented toward the stock strip, and an opposite inner end oriented away from the stock strip;
inserting said spring member over said outer end portion of the flange nut and the inner collar portion of the stripper wit

Assignees

• Standard Lifters Inc

Inventors

• Breen Scott M
• Pyper Joel T

Classifications

• B21D22/06

  having relatively-movable die parts · CPC title

• B21D37/08

  Dies with different parts for several steps in a process · CPC title

• B23P15/24

  dies (B21C3/18, B21C25/10, B21D37/20 take precedence) · CPC title

• B21D43/04

  by means in mechanical engagement with the work · CPC title

• B21D45/10

  Combined ejecting and stripping-off devices · CPC title