A blank casting process for high creep rate and high strength hydraulic motor shell

Abstract

The invention belongs to the technical field of motor casting and particularly relates to a high-creep-ratio and high-strength hydraulic motor body shell blank casting technology. A creeping device isincluded and comprises a rotating rod, a rotating block, an isolation mechanism and a scattering mechanism. The rotating rod is arranged in a ladle, and the isolation mechanism is arranged at the lower end of the rotating rod. The rotating block is fixedly connected to the upper end of the rotating rod, and the scattering mechanism is arranged at the middle portion of the rotating rod. The rotating block is arranged at the upper side of the interior of the ladle. The isolation mechanism comprises an installation ring, a connecting rod, a moving block and a connecting block. The connecting rodis fixedly connected to the outer surface of the installation ring. The high-creep-ratio and high-strength hydraulic motor body shell blank casting technology is mainly used for solving the problemsthat in the casting technology at present, when a crushing method is commonly used for producing vermicular graphite cast iron, molten iron and a vermicular agent can generate relative impacts, the vermicular agent is not detonated at the bottom or is detonated too early, the absorption rate of the molten iron on the vermicular agent is reduced, creeping is poor, and tensile strength and hardnessof a hydraulic motor body shell are affected.

Description

technical field [0001] The invention belongs to the technical field of motor casting, in particular to a blank casting process of a high-creep rate and high-strength hydraulic motor shell. Background technique [0002] The vermicular agent is an additive added to molten iron to obtain a vermicular graphite structure. At present, a compound alloy vermicular agent containing multiple elements is widely used. Commonly used are rare earth-silicon-calcium, rare earth-magnesium-titanium, rare earth-magnesium and other alloys. Vermicular graphite cast iron with excellent comprehensive properties can only be obtained after the amount of modifier exceeds a certain critical point, and can only be stabilized at a not in a wide range. This modificator is called a vermiser. The correct selection of vermicular agent and mastering the addition amount are the primary conditions for the stable production of vermicular graphite cast iron, and the addition amount of vermicular agent should b...

AI Technical Summary

Problems solved by technology

The present invention is mainly used to solve the problem that when the vermicular graphite cast iron is produced by the flushing method in the casting process, the existing vermicular graphite cast iron will make the molten iron and the vermicular agent collide relative to each other, so that the vermicular agent does not detonate at the bottom, reducing the temperature of the molten iron. The absorption rate of the vermicular agent leads to poor creep, which affects the casting tensile strength and hardness of the hydraulic motor shell

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