Several Manifestations of Cold Heading Die Failure
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Several Manifestations of Cold Heading Die Failure
When the mold is in production and application, different parts of the mold bear different forces, which cause various forms of damage at the same time or one after another. When the damage develops enough to hinder the normal operation of the mold or fail to apply, it will fail.
The following are several manifestations of carbide cold heading die failure:
- Overload failure
Overload failure refers to the failure caused by the material’s own carrying capacity is insufficient to resist the working load (including about 10% of the random fluctuating load). Two types of failures include insufficient toughness and insufficient strength. Attention should be paid to brittle failure due to insufficient toughness during production.
- Wear failure
Abrasion failure refers to the friction loss between the working part of the mold and the processed material, which causes the failure of the shape and size of the working part (cutting edge, punch) to change. It also includes two types of normal wear failure and abnormal wear failure.
- Normal wear failure.
For cold stamping and cold extrusion dies with strict requirements on surface dimensions, the life of the die depends on the wear resistance of the surface under the premise of ensuring that the material does not break. Generally, the service life of the cold forging dies is long, and the blanking die and extrusion die with high surface quality are prone to such failures.
- Abnormal wear failure.
Under the action of local high pressure, the working part of the mold and the material to be processed bite. The processed material is “cold welded” to the surface of the mold (or the mold material is “cold welded” to the surface of the processed material). It causes a sudden change in the shape and size of the processed product (or mold material), or severe scratches on the processed product surface, resulting in failure. Such failures are prone to occur in stretching, bending dies and cold extrusion dies.
- Fatigue failure (multiple impact fatigue failure)
The load of the cold heading die is applied periodically at a certain impact speed and a certain energy.This state is similar to the low-energy multi-stroke fatigue test (cyclic loading and unloading with a certain energy). Since the fracture life of die material multi-stroke fatigue is more than 1000 to 5000 times, usually, there is no obvious boundary between the crack fatigue source and the crack propagation zone.
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