Induction preheating process for cast iron liners of aluminum cylinder bodies of four-cylinder engine

Abstract

The invention relates to an induction preheating process for cast iron liners of aluminum cylinder bodies of a four-cylinder engine, which is characterized in that the preheating process for the liners is as follows: when a button is started, an inductor is dislodged and is vertically went down quickly at a preset speed of 1200mm / min into inner bores of the liners; when the lower end faces of four effective rings are 10mm over the lower end face of the liners, the inductor stops going down, carries out heating with the preset power of 88kW and delaying for 9.5 seconds; after the statically heating and delaying are finished, the inductor goes up at a preset speed of 300mm / min and carries out continuous scanning and heating; when the upper end faces of the four effective rings are 10mm over the upper end face of the liners, the inductor stops going up, carries out heating with the preset power of 88kW and delaying for 7 seconds; after the statically heating and delaying are finished, the inductor goes down at a preset speed of 1200mm / min into the inner bores of the liners to repeat the above preheating process again; and after twice cycle preheating processes are finished, the inductor goes up quickly at the speed of 1200mm / min to be away from the liners and back to the place. According to the invention, the distribution of axial temperature of the liners is uniform; and the external diameters of the four effective rings can be regulated simultaneously to enable the heating efficiency of the liners to be consistent, the cylinders are heated in a reciprocating heating mode, the heating and the diffusing homeothermy are carried out at the same time, the heating time is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention relates to an induction preheating process for a cast iron cylinder liner of an aluminum cylinder block of a four-cylinder engine, and belongs to the technical field of induction heating. Background technique [0002] Low-alloy cast iron cylinder liners need to be preheated before casting the aluminum cylinder block of the engine to ensure the fluidity of aluminum water and eliminate casting defects. The traditional process adopts the heating method in the furnace. The cast iron cylinder liner is heated to about 500oC through a conventional heat treatment furnace, and then fixed on the casting sand core of the aluminum cylinder body with temperature to carry out aluminum water casting, and finally the cylinder liner and the aluminum cylinder body are completed. Casting process. This process has high energy consumption, low production efficiency, no heat preservation measures after leaving the furnace, difficulty in ensuring temperature u...

AI Technical Summary

Problems solved by technology

This process has high energy consumption, low production efficiency, no heat preservation measures after leaving the furnace, difficulty in ensuring temperature uniformity, and difficult realization of casting automation production

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