A Casting and Rolling Forming Method of Inner Layer q345b Outer Layer 40cr Composite Ring

Abstract

The invention discloses a method for casting, rolling and forming inner layer Q345B and outer layer 40 chromium (Cr) composite rings, which belongs to the field of forming technique of rings, and comprises steps: 1) inner layer Q345B and outer layer 40 Cr steels of composite rings are smelted in different furnaces at the same time, and the tapping temperature respectively are 1650-1680 DEG C and 1600-1630 DEG C; 2) casting, running and ladle preheating; 3) casting the outer layer 40 Cr: the temperature is 1520-1530 DEG C, and the casting speed is 24.5-26.5kg / s; 4) casting the inner layer Q345B: the temperature is 1550-1570 DEG C, and the casted internal time of the outer layer and the inner layer is 27-30s; 5) cooling stripped molds: the mold stripping temperature is 1000-1050 DEG C; 6) melting down temperature compensation: the melting down temperature is 1230-1250 DEG C, and the temperature is compensated for 2.5-3h; and 7) ring rolling: the ring rolling temperature is controlled in 900+_10 DEG C. The method for casting, rolling and forming inner layer Q345B and outer layer 40 chromium (Cr) composite rings has the advantages that composite ring interfaces do not have gaps, are high in bonding strength and uniform in stress distribution, can improve organizational stability and wear resistance of the composite rings, and is short in technological process, reliable in production and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of ring forming, and in particular relates to a casting-rolling forming method for an inner Q345B outer layer 40Cr composite ring. Background technique [0002] The inner Q345B outer layer 40Cr composite ring is a common material for the support of concrete mixer trucks, and has 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 cold-drawn...

AI Technical Summary

Problems solved by technology

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 cold-drawn. For ring parts, the disadvantage of the above method is that the inner and outer ring blanks will not form a complete metallurgical bond, and the existence of gaps and stress concentration at the interface between the inner and outer layers will affect subsequent processing and reduce service life

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