• 2023-04-07
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The importance of mold hardness testing

The importance of mold hardness testing

In industrial production, die steel is the main material of die industry. The service life of the die and the precision, quality and appearance performance of the finished part are related to the design technology and manufacturing precision of the die and the precision of the machine tool and manufacturing operation. The choice of die material and the correct implementation of heat treatment process are also very important.

The heat treatment quality and service performance of die are usually judged by hardness.

Hardness is an important performance index of die material and finished die. The stress state of the die in operation is very complicated. For example, a hot working die is usually subjected to alternating stresses in an alternating temperature field, so it should have a good ability to prevent the die from changing into a softer or plastic state, and the dimensional accuracy of the die's shape remains constant in a long-term working environment. Typically, the hardness of the finished die is 59-60HRC for a cold working die, and about 48HRC for a hot working die.

Wear resistance is also an important performance index of finished die. When forming a part, the surface of the metal and the die cavity move relative to each other, which can wear down the surface of the cavity and cause the size, shape, accuracy, and surface roughness of the die to change and fail. The wear resistance of the die depends on the heat treatment of the die, especially the surface heat treatment. Hardness is also the main basis for evaluating wear resistance of die.

Hardness is an important property of die steel. In order to take care of other properties such as toughness, the die hardness range is relatively narrow. Therefore, how to use the Mattel portable hardness tester in the field quickly and accurately test the hardness of the mold manufacturing and use of the unit is of great significance. It can improve the quality of die products, improve the technical level of die manufacturing, and prolong the life of die.