Working conditions and performance requirements for the teeth of Volvo excavators

The performance requirements of the tooth are closely related to its working conditions. The tooth is directly in contact with sand, sand, soil and other materials. When the tooth is in service, it must not only bear the impact of the material, but also bear a certain bending moment. The abrasive is The sliding of the tip of the tooth causes various furrows on the surface, causing wear or falling off. This requires us to improve the wear resistance of the tooth material as much as possible while satisfying the working conditions. Have a certain strength and toughness.

The excavator tooth is usually installed at the front end of the excavator. It is a cantilever beam member. When working, the material contacts the material and rotates the material into the bucket. When the tooth contacts the material, it must bear the impact of the material. It also has to bear a certain bending moment, and the teeth will inevitably wear out during the contact of the materials and the loading process. When the tooth touches the ore, it has to bear the huge impact of the ore. Due to the irregular shape of the ore, the edge of the ore often cuts the surface of the tooth, which causes various furrow deformations on the surface, causing the surface to wear and fall off. Due to the difference in working conditions of the teeth, the wear of the teeth is very different. The working conditions of the large mining excavators are very bad.   

The teeth must bear the surface of the chiseling wear and also bear the strong impact, so that the consumption Very big. There are various types of buckets for excavation.    

There are soft materials such as lime, sand and loess, as well as hard materials such as rock and earth, ore, and even some materials with adhesion characteristics. The harsh working conditions require both teeth. To have sufficient hardness and wear resistance, it is also necessary to have high toughness, so as to ensure that it does not break under large impact and cantilever force.

The performance requirements of the tooth are closely related to its working conditions. The tooth is directly in contact with sand, sand, soil and other materials. When the tooth is in service, it must not only bear the impact of the material, but also bear a certain bending moment. The abrasive is The sliding of the tip of the tooth causes various furrows on the surface, causing wear or falling off. This requires us to improve the wear resistance of the tooth material as much as possible while satisfying the working conditions. To have a certain degree of strength and toughness, the following points are the performance requirements of high quality Volvo excavator bucket teeth.

1, must have a better model to buy, higher impact resistance, but also have a higher matrix strength and toughness, the impact absorption power ak ≥ 30J, the hardness of the base of the tooth or the hardness after work hardening Value ≥ 42HRC.

2. As far as possible, obtain the lath martensite structure with good toughness and sufficient hardenability to ensure uniform performance.

3. Casting excavator teeth should avoid columnar crystals as much as possible. The grain size is greater than 5, and no transverse crack is allowed.

The above content was explained by Noble, technical designer of the R&D department of A&S Bucket Teeth Co., Ltd.