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Method for casting air cylinder cover of diesel engine for chiller-free ship

A marine diesel engine and cylinder head technology, which is applied to casting molding equipment, casting molds, casting mold components, etc., can solve the problems of complex and difficult production operations, many factors to consider in casting methods, and high energy consumption, so as to eliminate leakage quality problems, casting cost savings, and the effect of improving surface accuracy

Active Publication Date: 2014-01-01
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Comparing and analyzing the relevant documents retrieved by the technology novelty search and the patents closest to the present invention, the similarities, differences and innovations of the documents, it is found that foreign advanced technologies are widely used and casting methods are relatively simple, while domestic advanced technologies are rarely used and casting methods are considered There are many factors, resulting in complex and difficult production operations, high energy consumption and high cost
The chilled iron-free casting cylinder head method of the present invention is simple and practical in operation, and has not been reported in domestic and foreign research

Method used

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  • Method for casting air cylinder cover of diesel engine for chiller-free ship
  • Method for casting air cylinder cover of diesel engine for chiller-free ship

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Effect test

Embodiment 1

[0047] M-type diesel engine cylinder head is made of HT350 cast iron, two pieces for each type, refractory pipe top injection, and two thermal insulation risers are designed to lead the ventilation of the core to the outside of the cavity. The top pouring system is adopted, and on the top surface of the cylinder head, 8 ingates are distributed from the top, thereby improving the temperature field distribution of the cylinder head casting and reducing the formation of shrinkage cavity and shrinkage defects of the casting. According to the solidification characteristics of the alloy material of the cylinder head, and taking into account the structure of the cylinder head itself. On the thick part of the casting, two riser, riser neck The riser not only plays the role of feeding, but also can discharge the gas in the cavity smoothly, and can also play the role of slag collection. Simultaneously set 5 on the top surface Air outlet rod, used to remove cavity gas.

[0048] Va...

Embodiment 2

[0051] The L-type diesel engine cylinder head is made of HT300 iron castings, and the castings are pressed to prevent leakage. The top injection pouring system is adopted, and the temperature drops rapidly during the pouring process. Since the casting can be filled smoothly, the lower the temperature, the smaller the liquid shrinkage, and the less conducive to the formation of shrinkage cavities and shrinkage porosity, so the top injection method is adopted. The gating system will improve the internal distribution of the cylinder head casting and reduce the formation of shrinkage cavity and porosity defects of the casting. At the same time, the temperature of the molten iron at the riser is higher than the internal temperature of the casting, which will also enhance the feeding effect of the casting. On the two thick parts of the top surface of its casting, two dimensions are placed riser, riser neck The riser not only plays the role of shrinkage feeding, but also can disch...

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Abstract

The invention discloses a method for casting an air cylinder cover of a diesel engine for a chiller-free ship. The method comprises the following steps: calculating main hot spots of a casting piece at first; arranging insulation risers at the two large hot spot parts of the top surface of the casting piece; designing an inner pouring gate at the small hot spot part of the top surface of the casting piece for achieving feeding and exhausting in a solidification process and forming a top-down temperature gradient; finally solidifying molten metal in the risers. The method is simple, convenient, reliable and suitable for casting the air cylinder cover of the diesel engine for the ship.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a casting method for a cylinder head of a marine diesel engine without a chiller. Background technique [0002] Cylinder head of marine diesel engine is one of the most critical parts of diesel engine parts. Gas distribution mechanism, etc. High dimensional accuracy requirements, strict tolerance requirements for main wall thickness (thickness around air passage, thickness of eruption surface, etc.), many local hot spots, large difference between maximum and minimum wall thickness, air passage, water cavity, oil passage and high pressure Hydrostatic test shall be carried out for oil pipe, etc., and pressure test shall be carried out for combustion surface. The hardness inspection shall be carried out between the valve and valve seats on the combustion surface of the cylinder head, and there are requirements for coloring and flaw detection. [0003] Domestic and for...

Claims

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Application Information

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IPC IPC(8): B22C9/22B22C9/08
Inventor 黄引平马敏团韩登峰李高峰张怀章郝炜杨军
Owner CSIC NO 12 RES INST
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