Crusher is mostly to crush hard materials, so the choice of equipment material is particularly important. This article takes the impact crusher as an example to explain the selection of equipment materials.
Impact crusher is a new type of high-efficiency crushing equipment, small size, large production capacity, large crushing ratio, uniform product size, and can be selective crushing operations. During the working process of impact crusher, the plate hammer head and impact plate are especially easy to wear and need to be replaced frequently.
In the early stages of work, the hammer head surface shape for the occurrence of change, mainly by the impact wear, the material to the positive force impact metal surface plastic deformation and impact crater, so be sure to carefully select the hammer head material. The wear resistance of the material is a comprehensive factor indicators, mainly with its hardness and toughness has a close relationship.
Hardness is an important condition to ensure that the hammerhead has abrasion resistance, and the hardness ratio between the material and the material has a great influence on the wear rate. When the ratio between 0.7-1.3, the wear rate began to rise, wear resistance is reduced. If the hardness of the material remains unchanged, you can try to improve the hardness of the material in order to significantly improve its wear resistance;
Flavors to improve the hardness of the material does not necessarily improve wear resistance, long-term production practice has proved: the same hardness of the material, and impact toughness of different hammers, its wear resistance is with the impact toughness of the value of the higher and higher. Therefore, the toughness of the material to improve wear resistance has a role that can not be ignored, is the material itself to absorb the size of the external energy sign.
In view of the importance of material selection, red star machine reminds manufacturers, want to improve the wear resistance of the hammer head and impact plate, the choice of material should comply with the following principles: First, in order to alleviate the material on the metal surface of the phenomenon of pinning, must improve the hardness of the hammer head material; Second, in order to inhibit the emergence of the hammer head cracks and expansion, reduce the fatigue spalling of the formation of the toughness must pay attention to improve the material.
Through repeated experimental research, Red Star Machine finally adopts high chromium alloy cast iron material for casting impact crusher, so that it has a good solution to the wear problem. The material has the characteristics of high alloy content, good fluidity, large shrinkage, poor thermal conductivity, etc. Therefore, in the design of its casting modeling process, the principle of sequential solidification is adopted, and in order to enhance the effect of risers on the casting of complementary shrinkage, impact hammers, impact plates and other thick and large castings are cast using the vertical pouring of rainfall insulated risers casting method.
Since the use of this wear-resistant material, red star machine found that not only reduces the degree of wear and tear of the equipment hammer head and impact plate, etc., but also effectively extends the service life of the equipment.