Due to the problems in the size matching of the inner cavity of the shovel head of the bucket tooth part that began trial production, the improper operation during the grinding process resulted in cracks in the inner groove of the square hole of the shovel head, and the...
Carbon is the main element in steel and plays a decisive role in the matrix structure of steel. A small amount of carbon is dissolved in ferrite, and the rest exists in the form of cementite. Carbon is the main element of strengthening, but in order to reduce the...
Through the analysis of the failed parts by the method of factor diagram, the reasons for the fracture of the working face of the guide wheel caused by sand casting are as follows. 1) Sand casting produces defects such as sand holes and pores (see Figure 1), which will...
Most of the shovel teeth of roadheader work in the environment of high impact, high wear and high hardness, so the materials must have high impact toughness and high hardness. Bainitic steel has good comprehensive mechanical properties and relatively low cost, which has attracted much attention in recent years....
The bucket of mining excavator is the main working part of excavator equipment. Its bucket teeth consume a lot in bad working environment. If the bucket teeth fail, it will not only accelerate the consumption of bucket, but also affect the subsequent mining crushing operation and cause serious economic...
The design of sand casting process plays a key role in the quality of castings. The traditional process design of sand casting mostly depends on experience, so for the process of complex sand casting, it can not be designed successfully at one time and needs continuous test, which not...
According to the general requirements of the bucket tooth detection system of excavator, the functions of the designed detection system are as follows: (1) System initialization function: the user specifies the location of the image storage folder and the detection result storage folder, and the user specifies the actual...
1. Cutting mechanism When the bucket tooth acts with the rock (ore) under high impact load, on the one hand, it contacts the surface of the rock (ore) and produces a large impact force. If the yield strength of the bucket tooth material is low, a certain plastic deformation...
The existing excavators are mainly mechanical excavators (also known as electric shovels) and hydraulic excavators. The bucket teeth (shovel teeth) are usually installed at the front end of the excavator bucket and are cantilever members. Bucket tooth is a key component of excavator, which significantly affects the working efficiency...
1. Floating core There are regular pits on the upper surface of nodular cast iron. After dissecting the nodular cast iron, it is confirmed that the thin and flat oil cavity sand core floats to the upper surface of the cavity after breaking. The defect condition is shown in...