Casting process for crankshaft

Abstract

The invention relates to a casting process for a crankshaft. The casting process comprises the following steps: step S01: producing a sand mould according to the design dimension requirements of the crankshaft, horizontally arranging the axis line of the sand mould, forming a direct gate and an inner gate in the sand mould, connecting the direct gate with the inner gate through a transversal channel, roasting the sand mould for 20 minutes at a high temperature of 750-900 DEG C, and then cooling to 400 DEG C; step S02: smelting a steel material in a circuit, after a temperature rises to 1400-1500 DEG C, adding a refining agent and refining for 20min to obtain molten steel in which a carbon content is 0.1-0.14%, a silicon content is 0.15-0.19%, a nickel content is 0.36-0.45% and a manganese content is 0.46-0.55%; step S03: pouring the molten steel in the step S02 into the direct gate and the inner gate of the sand mould in the step S01, controlling a pouring temperature to be 1560-1660 DEG C and controlling a pouring time to be 40s, and after the pouring is finished, insulating for 30min; and step S04: cooling to normal temperature, talking out the formed crankshaft, cleaning the surface of the crankshaft, and then polishing to obtain the crankshaft.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting process of a crankshaft. Background technique [0002] The crankshaft is composed of the main journal, the connecting rod journal, the crankshaft arm, the balance weight, the front axle end and the rear axle end. One of the connecting rod journals, the crank arms at both ends and the front and rear main journals are combined together, which is called crankshaft. Turns out, in the current pouring process of the crankshaft, the hardness of the finished casting is not enough, not only the casting process is more, which affects the production capacity, but also the precision of the casting cannot be effectively guaranteed, and the scrap rate is high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a crankshaft casting process for the above-mentioned deficiencies in the prior art. [0004] The technical solution...

AI Technical Summary

Problems solved by technology

[0002] The crankshaft is composed of the main journal, the connecting rod journal, the crankshaft arm, the balance weight, the front axle end and the rear axle end, etc. One of the connecting rod journals, the crank arms at both ends and the front and rear main journals are combined together, called the crankshaft. Turn, in the current pouring process of the crankshaft, the hardness of the finished casting is not enough, not only the casting process is more, which affects the production capacity, but also the precision of the casting cannot be effectively guaranteed, and the scrap rate is high