Running Scared

Posted by stephens on May 27, 2010 in Cam Dies, Engineering Decisions | 0 comments

Here is a note from my long-time die guy pal Pete Ulintz. Y’all know Pete; he took over the Tooling by Design column I used to write in MetalForming magazine. I am sure most of you have heard Pete speak at PMA events or have visited his website ToolingByDesign.com. This is his note: Tim, I like your blog regarding restrike operations. I have another...

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Pad Travel with Die Mount Cams

Posted by stephens on Jul 17, 2009 in Cam Dies, Engineering Decisions, Equations, Tips & Techniques | 0 comments

The main pad in a die with die mount cams must hold the stamping in place on the lower tool during the press downstroke before the cam steels make initial contact. On the press upstroke, the main pad must hold the stamping on the lower tool until the cam steels clear the stamping. The simplest way to ensure the proper timing of the main pad when die mount cams...

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Main Pad Travel with Aerial Cams

Posted by stephens on Jul 16, 2009 in Cam Dies, Engineering Decisions, Equations | 0 comments

The main pad in a die with aerial cams must hold the stamping in place on the lower tool during the press downstroke before the cam steels make initial contact. On the press upstroke, the main pad must hold the stamping on the lower tool until the cam steels clear the stamping. The simplest way to ensure the proper timing of the main pad when aerial cams are...

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Die Mount Cam Slide Return Force

Posted by stephens on Jul 2, 2009 in Cam Dies, Engineering Decisions, Equations, Tips & Techniques | 0 comments

The required slide return force for die mount cams needs to be calculated to determine if a cam pad or auxiliary pressure system is needed for the application. This applies to commercial cam units and homemade die mount cams. The equation for die mount cam slide return force is: Fdsr = Fs + {(0.00981 • ms) • [0.20 • (cos β + sin β)]} where: Fdsr =...

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Aerial Cam Slide Return Force

Posted by stephens on Jul 1, 2009 in Cam Dies, Engineering Decisions, Equations, Events, Tips & Techniques | 0 comments

In the spring of 1998, we witnessed an epidemic of commercial aerial cam unit failures in the field. These off-the-shelf cams were relatively new to the automotive industry, replacing the time-honored practice of engineering and constructing home-made aerial cams. We discovered that the cams were failing because the dies were engineered with no cam pad for...

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