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Method for casting low speed diesel engine cylinder cap for large cylinder diameter boat

A cylinder head and large cylinder diameter technology, which is applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of high cost of resin sand, large gas generation, and poor cylinder head feeding effect. The effect of reducing production cost, shortening production cycle and stabilizing casting production

Active Publication Date: 2015-07-22
ANHUI MAGANG HEAVY MASCH MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent No. 200910200341 is a method for producing cylinder head by casting, but the cylinder head produced by it has a cylinder diameter less than 82cm, and its casting scheme is to place two risers on the annular surface of the cylinder head. This scheme makes the cylinder head as a whole complement The shrinkage effect is not good and it is not convenient for the inclusions in the cavity to float up and gather into the riser, which will inevitably affect the reliability, stability and product quality of its production; at the same time, the cost of resin sand used in its molding is high and the gas generation is large , and formaldehyde and other harmful gases are produced during the pouring process and pollute the environment

Method used

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  • Method for casting low speed diesel engine cylinder cap for large cylinder diameter boat
  • Method for casting low speed diesel engine cylinder cap for large cylinder diameter boat
  • Method for casting low speed diesel engine cylinder cap for large cylinder diameter boat

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Embodiment 1

[0026] The specific parameters of the cylinder head castings of the 7RT-flex82T large-bore marine low-speed diesel engine with a bore of 82cm are as follows:

[0027] Casting material: G17CrMo5-5

[0028] Maximum outer dimension of casting: φ1520mm×542mm

[0029] Maximum wall thickness of casting: 400mm

[0030] Minimum wall thickness of casting: 210mm

[0031] Rough casting weight: 5400kg

[0032] The specific casting process of this cylinder head is as follows:

[0033] (1) Casting process design. According to the principle of sequential solidification, with the large plane of the cylinder head as the parting surface, a circular riser 1 is placed in the middle of the large plane, and a subsidy 2 is set under the riser 1. This subsidy can ensure that there are enough feeding channels to make the riser The molten steel can be fed to the largest hot spot of the casting body. Compared with the symmetrical placement of two risers on the annular surface, this solution is more conducive to ...

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Abstract

The invention discloses a method for casting a low speed diesel engine cylinder cap for a large cylinder diameter boat, which comprises the following steps: (1) compiling casting processes: designing a joint surface and a cast system according to a progressive solidification principle; (2) making a wood mold; (3) moulding; (4) melting the poured melt; (5) pouring a casting; (6) insulating and cooling; (7) dismantling mold and cleaning; (8) tempering. The cylinder cap obtained by the casting method does not have casting defects, thereby achieving the technology requirement for casting the cylinder cap. The invention method can substantially reduce the production cost and shorten the production period, and guarantee the stable casting production of the low speed diesel engine cylinder cap for the large cylinder diameter boat in the precondition that formaldehyde and other harmful gases do not generated for polluting environments.

Description

Technical field [0001] The invention relates to the field of material forming, in particular to a method for casting a large cylinder diameter marine low-speed diesel engine cylinder head. Background technique [0002] Cylinder head is an important key component of marine diesel engine, especially the cylinder head of large marine diesel engine. Because of its long-term working under high temperature conditions, its quality requirements are very high. The castings are not allowed to have cracks, shrinkage holes, porosity, pores, etc. Casting defects such as sand holes, slag inclusions, and cold barriers. Therefore, in order to cast a cylinder head with all aspects of quality and performance up to the standard, more casting process technical parameters need to be considered, which is difficult to manufacture. Therefore, the current domestic cylinder head products are still mostly forgings, but forgings have high production costs and long production cycles compared to castings. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/22
Inventor 边敦亭胡黎辉徐德安郭蕾蕾胡成明
Owner ANHUI MAGANG HEAVY MASCH MFG CO LTD
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