Browse Prior Art Database

Punches with Replaceable and Renewable Inserts

IP.com Disclosure Number: IPCOM000074211D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Delacey, RA: AUTHOR [+2]

Abstract

This punch permits the continued use of a punch after it has been chipped, broken or worn. Shank 10 is formed to accept steel punch insert 12. The steel punch insert 12 has a shoe 14 rigidly attached to the nonworking end. A hollow steel collar 16 is inserted within shank 10. Insert 12 is forced through shank 10 until shoe 14 engages one end of collar 16. Then set screws 18 are threaded into shank 10 to retain shoe 14 in contact with collar 16. The dual set screw arrangement prevents loosening due to vibrations and impact. When insert 12 becomes broken, worn or chipped the punch is disassembled by removing set screws 18 and insert 12 along with collar 16.

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Punches with Replaceable and Renewable Inserts

This punch permits the continued use of a punch after it has been chipped, broken or worn. Shank 10 is formed to accept steel punch insert 12. The steel punch insert 12 has a shoe 14 rigidly attached to the nonworking end. A hollow steel collar 16 is inserted within shank 10. Insert 12 is forced through shank 10 until shoe 14 engages one end of collar 16. Then set screws 18 are threaded into shank 10 to retain shoe 14 in contact with collar 16. The dual set screw arrangement prevents loosening due to vibrations and impact. When insert 12 becomes broken, worn or chipped the punch is disassembled by removing set screws 18 and insert 12 along with collar 16. The end or tip of insert 12 is again sharpened or ground to reshape it and collar 16 is ground to remove that portion of the length necessary so that when reassembled the insert 12 will extend beyond shank 10 by the desired amount taking into consideration the stock, thickness, dye entry and clearances required.

The use of the shoe and collar to maintain dimensional control also improves the disposition of forces when the punch is in operation. Punch life is increased many fold and cost reduced by this punch assembly.

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