Page 45 - MetalForming August 2011
P. 45

 Drawing clearance
Gap
block Die
Blankholder
Drawing Clearances as a Function of Material Thickness
Punch
Material Thickness, T
<0.016 in. 0.016 in. – 0.050 in. 0.050 in. – 0.125 in.
>0.152 in.
First Draw
1.08T
1.08 – 1.10T
1.10 – 1.13T
1.13 – 1.15T
Redraw
1.09 – 1.10T 1.10 – 1.13T 1.13 – 1.15T
1.15 – 1.20T
Sizing Draw
1.04 – 1.05T 1.05 – 1.06T 1.06 – 1.08T
1.08 – 1.10T
run at higher speeds during normal operating temperature.
A Note About Lube
Modern lubricants are formulated to provide tremendous sur- face adhesion and tenacity. Extreme-pressure (EP) additives provide excellent anti-galling tendencies under extreme heat and pressure conditions. Selecting the proper lubricant for the tem- perature range in which the forming process operates is crucial
Suggested Drawing Clearances
A table may be used to determine the die clearances for drawn corners.
heating the die until reach- ing its operating tempera- ture, but it allows the die to
when galling becomes a problem. While adding greater quanti- ties of an insufficient lubricant can aid the forming process, the practice wastes money and creates a mess in the workplace that requires cleanup. A better solution: Work with your lubricant sup- plier to choose the appropriate lubricant for your process.
Applying more lubricant, reducing press speed and adding surface coatings to die steels are common solutions when galling occurs, but are not always the proper solutions. Machining proper die clearances and using forming lubri- cants designed for the specific operating temperature of your process may be cheaper and more reliable. MF
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MetalForming/August 2011 43
Tooling by Design
Production Engineering
Purchasing Customer Service
ERP
Delivery Accounting
Human Resources
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