Method for casting cast steel cylinder cover

Abstract

The invention relates to a method for casting a cast steel cylinder cover, which mainly comprises the following steps of: 1, formulating a casting process of a cylinder cover by adopting a method of plane parting, designing a pouring system serving as exothermic risers by taking the upper end face of the cylinder cover as a parting surface and by adopting a mode of bottom pouring, arranging two triangular convex plates between the two exothermic risers on the top of a casting mold additionally as slag collecting platforms, and arranging exhaust pipes at three corners of the triangular convex plates; 2, manufacturing a wood die, and positioning the wood die on a shaping plate; 3, manufacturing the casting mold and putting chilling blocks into the casting mold; 4, closing the mold, and drying a sand mold; 5, performing the refining of an LF furnace after conventional smelting, blowing inert gases in the smelting process, and feeding wires after steel tapping; 6, pouring castings and adding an exothermal agent; 7, opening the mold for hot cutting; and 8, performing heat preservation and cooling, and performing heat treatment of quenching and tempering after the rough machining of the cylinder cover. When the method is used for casting cast steel cylinder covers on marine diesel engines, the forming is completed by one step, the yield is high and few defects are generated.

Description

technical field [0001] The invention relates to material forming, in particular to a method for preventing casting defects during the casting process of a cast steel cylinder head on a marine diesel engine. Background technique [0002] In the prior art, the cylinder heads used in the production of marine low-speed diesel engines generally adopt forgings, but the manufacturing process of forged cylinder heads is relatively complicated and the cost is high. Steel castings have the advantages of simple process and low cost. Some companies have begun to use or are using cast steel as cylinder heads and sell them externally. Therefore, the successful trial production of the cast steel cylinder head will bring huge economic effects to the branch company and the heavy machinery company. Our company also produced cast steel cylinder heads for domestic marine diesel engines in the 1980s, and the production experience can be used for reference. [0003] Due to the special working e...

AI Technical Summary

Problems solved by technology

[0006] Due to the wall thickness of the cylinder head, large thermal joints, and high material requirements, the above-mentioned conventional casting process has the following disadvantages: 1) The yield is low, and shrinkage and shrinkage are easy to occur underneath; 2) The material properties are difficult to meet the high-strength requirements; 3) The upper end surface of the cylinder head has serious shrinkage and porosity

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