Casting method and tool of crosshead slider white alloy of large low speed marine diesel engine

Abstract

The invention discloses a casting method and tool of a crosshead slider white alloy of a large low speed marine diesel engine. The casing method includes the steps that an L-shaped tire plate integrally connected by a long plate and a short plate and a crosshead slider are placed on a casting platform, the inner surface of the long plate is opposite to a separated cavity the front of the crossheadslider, the inner surface of the tail part of the short plate is connected with one end face of the crosshead slider in a close contact mode, a baffle plate and a baffle block are placed on the tailpart of the long plate of the tire plate and combined with a bayonet for mounting and positioning, the screw rod part of a fastening rod is matched with a screw hole of the baffle block, and the frontend of the fastening rod is pressed against the baffle plate; the inner surface of the long plate of the tire plate, the inner surface of the short plate of the tire plate, the front face of the crosshead slider and the upper face of the casting platform form a combined cavity; and white alloy melt is cast for forming, after the white alloy melt is cooled to be integrally solidified with the front face of the slider, a depressurized groove quickly releases internal fluid pressure to slow down theleakage speed, the liquid white alloy is solidified rapidly in the depressurized tank at the sametime, and thus the liquid white alloy is prevented from leaking to the exterior of the tire plate. Decladding, pore, slag inclusion and other defects are effectively avoided, and the combined qualityof the white alloy is increased.

Description

technical field [0001] The invention relates to a white metal casting and connecting forming method of a composite white metal body at the front end of a crosshead slide block of a large low-speed marine diesel engine. Background technique [0002] The crosshead slider is an important part of the marine diesel engine. Its service conditions are complex, and its main function is to ensure that the piston rod and the crosshead move vertically and repeatedly in the frame of the marine diesel engine. The slider body is made of cast steel. In order to make it move more smoothly and reduce friction, white metal is cast on its contact surface with the frame. White metal has good comprehensive mechanical properties such as wear reduction and corrosion resistance, and is widely used as surface laying materials for sliding bearings of large low-speed marine diesel engines. The casting quality of the traditional casting method is extremely unstable, white metal liquid leakage often oc...

AI Technical Summary

Problems solved by technology

The casting quality of the traditional casting method is extremely unstable, white metal liquid leakage often occurs during the casting process, and it is very easy to cause shelling, pores, slag inclusions and other defects

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