ILIF conceptual principle

Conceptual principle of mold life: Mold life is the number of manufacturing hours (stamping and forming hours) that a mold can achieve, assuming that part quality is ensured.This includes repeated sharpening and replacement of worn parts until the mold is replaced with the total number of qualified parts of which the main part of the mold is formed.

Mold service life: the number of times a mold has been manufactured.Mold failures are divided into abnormal and normal failures.Abnormal failure (premature failure) refers to the inability of a mold to function when it has not reached its recognized service life at a particular industrial level.Forms of early failure include plastic deformation, fracture, and severe localized wear.Normal failure refers to the inability of a mold to continue to function after being used in mass production because of slow plastic deformation or relatively uniform wear or fatigue failure.

1, the normal life of mold

The number of qualified products produced before the mold fails normally is called the normal life of the mold, called mold life; the number of qualified products produced before the mold is repaired for the first time is called the firstlife; the number of qualified products produced before the mold was repaired for the first time is called the repair mold life.Mold life is the sum of the initial life and each repair life.

2, mold breakage forms and principles

Although there are many different types of molds, operating conditions vary widely, and damaged parts vary, there are three types of failure modes: wear, fracture, and plastic deformation.

①.Wear failure

When the mold is operating, the mold is in contact with the forming blank, generating relative motion.The progressive loss of material from the contacting surfaces due to the relative motion of the surfaces is referred to as wear.Wear defects can be classified into the following categories

a. Fatigue wear

When two contacting surfaces move against each other, under the action of cyclic stresses (mechanical and thermal), the phenomenon of reduced metal fatigue on the surface is called fatigue wear.

b. Cavitation wear and erosion wear