Method for casting axle box cover

Abstract

The invention discloses a method for casting an axle box cover. The axle box cover comprises the following raw materials by weight: 30 to 35 percent of new iron, 30 to 35 percent of waste steel and 30 to 35 percent of old iron, wherein the weight percentage of the three raw materials is 100 percent; and the axle box cover comprises the following chemical components: 3.6 to 3.8 percent of C, 1.8 to 2.4 percent of Si, less than 0.25 percent of Mn, less than 0.8 percent of P and less than 0.02 percent of S; and after being balled by adopting a 7-8REMG balling agent, the content of Mg is 0.045 to 0.3 percent, and the content of rare earth (RE) is 0.02 to 0.04 percent. The raw materials are smelted in an intermediate frequency furnace, the smelting temperature is 1,500 to 1,570 DEG C, and the casting liquid obtained by smelting is cast into the axle box cover at the temperature of between 1,390 and 1,410 DEG C. According to the casting method, the chemical components are reasonable, so that the performance of the casting is effectively improved; and the casting temperature and the casting time are reasonably controlled, the tissue grains are fine and uniform, the casting defects are reduced, the yield of casting blanks is improved, the investment can be reduced, and the cost is reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a method for casting an axle box cover. [0003] Background technique [0004] At present, since the axle box cover needs to match the axle box opening, the thickness of the axle box cover is different, and the strength requirement is high, so casting is difficult. Because the element composition of the casting raw material of the axle box cover is not reasonable enough, it is easy to cause defects such as pores, slag holes, and sand inclusions in the cover body and be scrapped. For example, if the silicon content of the casting raw material is low, it is not conducive to graphitization, and it is easy to increase the shrinkage cavity. The tendency to produce; and if the manganese content is too high, the elongation will be reduced, and the low temperature impact resistance of the casting will also be reduced. Therefore, rationally configuring the chemical ...

AI Technical Summary

Problems solved by technology

Because the element composition of the casting raw material of the axle box cover is not reasonable enough, it is easy to cause defects such as pores, slag holes, and sand inclusions in the cover body and be scrapped. For example, if the silicon content of the casting raw material is low, it is not conducive to graphitization, and it is easy to increase the shrinkage cavity. The tendency to produce; and if the content of manganese is too high, the elongation will be reduced, and the low temperature impact resistance of castings will also be reduced