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TribSheet #201
What is die wear?
Die wear, simply put, is a change in a die surface that may affect die performance.
 
Why should I worry about die wear?
Die wear, like death and taxes, is unavoidable. But can be controlled so that your dies live long and productive lives.
 
What can I do about die wear?
Some types of wear occur gradually and by monitoring die wear, die maintenance and replacement can be predicted. Other types of die wear occur rapidly and are unpredictable. These types of wear can put a process out of control or cause die breakage. The best defense against wear is to know the types of wear and how to deal with each.
 
There are several types of wear including:
 
Adhesive Wear
Caused by: Cold welding
Results in: Pickup, scoring, etc.
 
Abrasive Wear
Caused by: Hard surfaces or particles
Results in: Metal removal
 
Fatigue Wear
Caused by: Repeat loading
Results in: Micro-cracking, spalling
 
Chemical Wear
Caused by: Chemical Reaction
Results in: Reaction Products
 
Mixed Wear
Caused by: Combinations of above
Results in: scoring, scuffing, galling
 
Adhesive wear is actually a build up of workpiece material on the die known as pickup. These photographs show pickup on a tube bending mandrel and the resulting scoring on the inside of the bent tube. The scoring increased drag and caused the tube to split during the bending process.
 
Selecting the proper die material/coating and choosing a lubricant that provides protection against metal-to-metal contact can avoid this type of wear.


All information presented on this web site is copyright   TribSys Inc. 2005.