Multi-punch tool and method of punching hole in a part

Abstract

A tool for punching a work piece has a multi-punch surface equipped to punch one or more hole in a work piece with interchangeable punch surfaces and uses a threaded draw bar and threaded nut, wherein the draw bar is configured to fit in die punch and maintain a punch surface relative to a die holder.

1 . A tool for punching a work piece, which includes:
 a primary punch surface equipped to punch a hole in a work piece;   a punch holder connected to the primary punch surface;   a first draw bar open surface extending through said primary punch surface of a geometric cross sectional having at least two flat sides and an arcuate side interconnecting said flat sides;   a die holder having a second draw bar open surface similarly geometrically configured to said first draw bar open surface which can be coaxially aligned when said punch holder is disposed adjacent said die holder;   a draw bar having a threaded end, a mid-section configured with a like complementary geometrically configured to said first draw bar configuration to be longitudinally slid through said draw bar open surfaces, and an enlarged end which will not pass through said draw bar open surfaces; and   a threaded nut for threaded connected to said threaded end.   
     
     
         2 . The tool for punching a work piece of  claim 1 , wherein said primary punch surface includes a plurality of peripheral ridges and valleys. 
     
     
         3 . The tool for punching a work piece of  claim 1 , wherein said primary punch surface is part of a primary punch member removably connected to a primary punch member receiving surface of said punch holder. 
     
     
         4 . The tool for punching a work piece of  claim 3 , wherein said punch holder includes at least one secondary orifice about said punch member receiving surface and at least one secondary punch member having a punch surface removably disposed in said at least one secondary orifice. 
     
     
         5 . The tool for punching a work piece of  claim 4 , which includes a back cap which is removably connected to a back of said punch holder and maintains said secondary punch member in a fixed position. 
     
     
         6 . The tool for punching a work piece of  claim 1 , which further includes a thrust bearing disposed about said threaded end between said threaded nut and said die holder. 
     
     
         7 . The tool for punching a work piece of  claim 1 , wherein said die holder has a front formed with an open surface to receive said primary punch surface and a work piece material as a work piece is punched. 
     
     
         8 . The tool for punching a work piece of  claim 4 , wherein said die holder has a front formed with an open surface to receive said punch surfaces and a work piece material as a work piece is punched. 
     
     
         9 . The tool for punching a work piece of  claim 3 , wherein said primary punch member has a third draw bar open surface which can be co-axially aligned with said first draw bar open surface when said primary punch member is disposed against said punch holder. 
     
     
         10 . The tool for punching a work piece of  claim 1 , wherein said draw bar open surfaces are centrally oriented. 
     
     
         11 . A tool for punching a work piece, which includes:
 a primary punch surface equipped to punch a hole in a work piece;   a punch holder connected to the primary punch surface having a first draw bar open surface and includes at least one secondary orifice about said primary punch surface and at least one secondary punch member having a punch surface removably disposed in said at least one secondary orifice;   a die holder having a second draw bar open surface which can be coaxially aligned with said draw bar open surface of said punch holder when said die holder is disposed adjacent said punch holder;   a draw bar having a threaded end, a mid section configured with a like complementary geometrically configured to said first draw bar open surface and said second draw bar open surface to be longitudinally slid through said draw bar open surfaces, and an enlarged end which will not pass through said draw bar open surfaces; and   a threaded nut threaded to said threaded end when said draw bar is inserted through said draw bar open surface.   
     
     
         12 . The tool for punching a work piece of  claim 11 , wherein said primary punch surface includes a plurality of peripheral ridges and valleys. 
     
     
         13 . The tool for punching a work piece of  claim 11 , wherein said primary punch surface is part of a primary punch member removably connected to a primary punch member receiving surface of said punch holder having a central open surface through coaxially aligned with said first draw bar open surface. 
     
     
         14 . The tool for punching a work piece of  claim 11 , which includes a back cap which is removably connected to a back of said punch holder and maintains said secondary punch member in a fixed position. 
     
     
         15 . The tool for punching a work piece of  claim 11 , wherein said draw bar open surfaces are of a geometric cross sectional having at least two flat sides and an arcuate side interconnecting said flat sides. 
     
     
         16 . A method of punching a work piece, which includes:
 disposing one side of a work piece adjacent a die holder which has an open surface to receive a draw bar therethrough;   disposing a second side of the work piece adjacent a die punch which has an open surface to receive the draw bar therethrough, wherein said die punch is equipped to provide one or more die punch surface; and   advancing a draw bar through said open surfaces in a manner to draw said die punch against the work piece to cut one or more openings in the work piece in a single pass.   
     
     
         17 . The method of  claim 16 , wherein said draw bar has a threaded end, a mid-section configured with a complementary configuration to be longitudinally slid through said open surfaces with the threaded end extending out of said die holder, and an enlarged end which will not pass through the open surfaces and is disposed adjacent said punch holder, threading a threaded nut to the draw bar to cause said advancing of said draw bar. 
     
     
         18 . The method of  claim 17 , which includes employing a thrust bearing between said threaded nut and said die holder. 
     
     
         19 . The method of  claim 16 , wherein the work piece is formed to have an open surface to receive the draw bar therethrough.