Author
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Topic: engineered equation for determining exact clamp force
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david owen Member Posts: 2 From:jackson,tn,usa Registered: Feb 2007
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posted February 18, 2007 01:13 PM
I am a lead process technician for an automotive supplier and ran into some clamping issues with new tools coming into the shop. Tools designed for a standard tpo, but have been changed to a different matetrial. Originally trialed at 750tn per cavity but now will not even hold at 1800tn with new material material supplier says clamping force should be 3-5tn per sq/in. We are only using 1000psi of max. substained injection pressure. The part is .90 thick, 13" wide, and 42" long. Runner depth is .375 usings extremely large fan gates. Actually 3 gates are .500 wide and center gates are 4" wide. The material is a newly engineered grade tpo, with ground up reprocessed tires. I would appreciate if someone could help me with an actaual engineering equation for determing clamp force for new molds. Thanks
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Stephen J. Derezinski Senior Member Posts: 80 From:Penfield, NY, 14526, USA Registered: Apr 2003
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posted September 08, 2007 09:55 PM
How fast is the cavity filled? Do you have measurement of the motion of the ram? Depending on the speed of the ram, you may have some hydraulic transient pressure spikes involved. Try slowing down the fill. ------------------ Steve Derezinski, Ph.D. Extruder Tech, Inc. steve@extrudertech.com www.extrudertech.com IP: Logged |
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