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Casting die for valve shell casting of marine diesel engine and casting process of valve shell

A technology of marine diesel engine and casting process, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc.

Active Publication Date: 2012-05-23
CRRC QISHUYAN INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, at present the valve housing casting still needs to be imported from abroad

Method used

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  • Casting die for valve shell casting of marine diesel engine and casting process of valve shell
  • Casting die for valve shell casting of marine diesel engine and casting process of valve shell
  • Casting die for valve shell casting of marine diesel engine and casting process of valve shell

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Embodiment Construction

[0033] The embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

[0034] One of the specific implementation modes, as attached figure 2 , 4 shown and please refer to the attached Figure 5 .

[0035] A casting mold for castings of exhaust valve housings of medium and low-speed marine diesel engines, the casting mold is a resin sand mold, and it:

[0036] Taking the axial centerlines of the small window 1 and the large window 2 of the casting as parting surfaces, resin sand molds are used to form upper and lower cavity resin sand molds 3 and lower cavity resin sand molds 4 respectively;

[0037] Forming chills 6 are arranged on the outer end faces of the casting flange cavity 5 of the upper cavity resin sand mold 3 and the lower cavity resin sand mold 4;

[0038] The sand cores falling in the resin sand mold cavity include the first sand core 7, the second sand core 8, the third sand core 9 and the fourth sa...

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Abstract

The invention discloses a casting die for a valve shell casting of a marine diesel engine and a casting process of the valve shell. The casting die is mainly characterized in that a contoured chill is additionally arranged at the outer end face of the flange cavity of the valve shell, a combined sand core is adopted, a chrome sand layer is distributed at the thick part of the casting wall of the sand core, and pouring gates and dead heads are reasonably arranged. The casting process is mainly characterized by comprising compounding, smelting, treatment before assembly of the casting die and die assembling by matching core, pouring and cleaning. The casting die for the valve shell casting of the marine diesel engine and the casting process of the valve shell has the advantages of reasonable structure of the casting die, simplicity and easiness to control in the casting process, uniformness in cooling of the casting and good feeding effect, effectively overcomes the leakage of the finished valve shell, and provides support for localization of all valve shell castings.

Description

technical field [0001] The invention relates to a casting process, in particular to a casting mold for a valve shell casting of an exhaust valve of a marine diesel engine and a casting process for the valve shell. Background technique [0002] The exhaust valve casing of the marine diesel engine is a steel casting with a volume of φ152×height of 352mm and a weight of 32Kg. It is an important part of the exhaust valve of the diesel engine. In industrial production, the rough casting of the valve housing is generally casted with low-carbon chromium alloy steel. The chemical composition of the material is: C0.12~0.17, Si0.30~0.40, Mn0.40~0.60, Cr2.80~3.20, Mo0.35~0.65, Cu≤0.40, Ni≤0.40, S≤0.04, P≤0.04, Fe balance; the requirements for the mechanical properties of the material are: tensile strength ≥ 620Mpa, yield strength ≥ 420Mpa, elongation ≥ 13%, impact energy AKV 2 ≥25J, hardness 179~225HB. It is required that the valve casing does not produce pressure leakage in the 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/24B22C9/08
Inventor 钱坤才严运涛
Owner CRRC QISHUYAN INSTITUTE CO LTD
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