Centrifugal casting method for composite ring with Q345B steel inner layer and 40Cr steel outer layer

Abstract

The invention provides a centrifugal casting method for a composite ring with a Q345B steel inner layer and a 40Cr steel outer layer, and belongs to the field of casting of ring-shaped parts. The centrifugal casting method is characterized by comprising the following process steps that (1) inner layer Q345B steel and outer layer 40Cr steel of the composite ring are smelted in different furnaces at the same time, the tapping temperature of the inner layer Q345B steel is 1650-1680 DEG C, and the tapping temperature of the outer layer 40Cr steel is 1600-1630 DEG C; (2) the preheating temperature of a casting mold ranges from 150 DEG C to 180 DEG C, and the preheating temperature of a casting ladle and the preheating temperature of a pouring gate range from 250 DEG C to 300 DEG C; (3) the outer layer is cast with the temperature ranging from 1520 DEG C to 1530 DEG C, and the casting speed is 24.5-25.5 kg / s; (4) the inner layer is cast with the temperature ranging from 1550 DEG C to 1570 DEG C, and the time interval between casting of the outer layer and casting of the inner layer is 27-29 s; and (5) mold stripping is carried out after cooling, then slow cooling is carried out, and the mold stripping temperature ranges from 1000 DEG C to 1050 DEG C. The centrifugal casting method has the advantages that the inner layer and the outer layer are completely melted and combined, and gaps in an interface are avoided; the combination strength is high, stress of the composite ring can be evenly distributed, and the wear resistance of the composite ring is improved; the production process is simple and reliable.

Description

technical field [0001] The invention belongs to the field of ring parts casting, and in particular relates to a centrifugal casting method for an inner layer Q345B outer layer 40Cr composite ring. Background technique [0002] The inner layer Q345B outer layer 40Cr composite ring is a common material for the support of concrete mixer trucks, and has good wear resistance. At present, the domestic and foreign production method of inner layer Q345B outer layer 40Cr composite ring is to use mechanical nesting assembly and then carry out cold drawing deformation, that is, to apply penetrating agent on the inner surface of the outer ring blank and the outer surface of the inner ring blank respectively, and then The inner and outer ring blanks of two different materials are fitted together, and then the joint surface is sealed, vacuumized, placed in a high-temperature furnace for long-term heating, and the two are combined through the diffusion of atoms at the interface, and then c...

AI Technical Summary

Problems solved by technology

At present, the domestic and international production method of inner layer Q345B outer layer 40Cr composite ring is to use mechanical nesting assembly and then carry out cold drawing deformation, that is, to apply penetrating agent on the inner surface of the outer ring blank and the outer surface of the inner ring blank respectively, and then The inner and outer ring blanks of two different materials are fitted together, and then the joint surface is sealed, vacuumized, placed in a high-temperature furnace for long-term heating, and the two are combined through the diffusion of atoms at the interface, and then cold-drawn. With a certain length of ring, the disadvantage of the above method is that the inner and outer ring blanks will not form a complete metallurgical bond, and the gaps and stress concentration at the interface between the inner and outer layers will affect subsequent processing and reduce service life