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Method for setting riser on casting of ship diesel engine body

A technology for marine diesel engines and castings, which is applied to casting molding equipment, casting molds, and casting mold components. It can solve the problems of reducing the mechanical properties of fuselage castings, reducing the effective bearing area, and destroying metal continuity, so as to improve self-replenishing Shrinkage ability, shrinkage porosity defect reduction, and the effect of reducing the amount of expansion

Active Publication Date: 2014-03-26
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the body of the ductile iron diesel engine has shrinkage cavity phenomenon, that is, the casting shrinks during the condensation process to produce holes, the shape is irregular, the hole wall is rough, and it is generally located at the hot joint of the casting.
The existence of shrinkage cavity destroys the continuity of the metal, reduces the effective area of ​​bearing, and reduces the mechanical properties of the fuselage casting

Method used

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  • Method for setting riser on casting of ship diesel engine body
  • Method for setting riser on casting of ship diesel engine body
  • Method for setting riser on casting of ship diesel engine body

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Embodiment 1, the installation method of the riser of the marine M-type diesel engine fuselage casting, the cylindrical open riser is arranged on the foot plate.

[0073] 1) Calculation of the modulus of the casting part

[0074] The key part of the casting is the foot plate, which can be regarded as a flat plate similar to δ=77mm, and its modulus M Riser modulus Mt=0.8M=3.08, riser neck modulus M'=0.6MT=1.848.

[0075] 2) Riser modulus calculation

[0076] Riser: Take the increase factor f 1 = 1.5, then the diameter of the riser d=1.5×12.32=18.48cm, and a thermal insulation riser sleeve with an inner diameter of φ180 is actually used.

[0077] 3) Riser neck calculation

[0078] Take the reduction factor f 2 =0.8, the diameter of the riser neck is 7.392×0.8=5.9cm, and the actual size of the riser neck is φ70×50mm.

[0079] 4) Finish casting.

[0080] The use of this riser avoids the use of casting molds with high rigidity (such as: cement sand mold, dry sand...

Embodiment 2

[0081] Embodiment 2, the setting method of the riser of the nodular cast iron fuselage casting of the marine P-type diesel engine, the spherical dark riser is arranged at the center line of the crankshaft, and the calculation is carried out according to the above formulas (2) and (3).

[0082] The key part of the fuselage casting here is the bolt hole of the main bearing, which is similar to a 119×119 cube, and its modulus Riser modulus: Mt=0.8M=2.38, riser neck modulus=0.6Mt=1.428.

[0083] Spherical Riser: Taking the increase factor f1=1.2, the riser diameter d=1.2×14.28=17.136cm, and the φ170 spherical dark riser is actually used.

[0084] square riser neck Take the reduction factor f 2 =0.9, then the side length of the square riser neck is 5.7×0.9=5.1cm, and the size of the riser neck after rounding is 50×50mm.

[0085] The P-type diesel engine ductile iron fuselage casting adopts the riser, which effectively improves the shape and dimension accuracy of the fuselage...

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Abstract

The invention provides a method for setting a riser on a casting of a ship diesel engine body. The riser is arranged at a central line part between a bottom plate of the casting and a crankshaft, the riser and a riser neck are previously solidified on the casting, and the diameter of the riser and the diameter of the riser neck are calculated according to the modulus of the riser and the modulus of the riser neck. The method solves the problems that as a traditional technology adopts a casting method for compensating contraction by the riser and the riser neck, excessive molten iron is squeezed back to the riser when the casting enters a graphitization expansion period, and although the casting is prevented from a concentrated contracted hole under the gravity action of the molten metal column of the riser when secondary contraction occurs in a solidifying later period, micro contracted loosening among eutectic colonies cannot be overcome. According to the application, the riser and the riser neck are previously solidified on the casting, and pressure is built in the casting through the utilization of all or part of eutectic expansion quantity. The contraction self-compensation capability is improved, and contracted loosening flaws are reduced.

Description

technical field [0001] The invention belongs to the technical field of casting methods, and relates to a method for setting a riser of a marine diesel engine fuselage casting. Background technique [0002] The fuselage is one of the most critical parts of the marine medium-speed diesel engine. The casting is semi-tunnel type, and the cylinders are arranged in two rows, and the angle between the cylinders is 90°. The fuselage castings are compact in structure, large in size, lubricating oil passages and cooling water passages are cast inside, the geometry of the inner cavity and outer wall is relatively complex, the wall thickness is uneven, the maximum and minimum wall thicknesses are very different, and the distribution on the body is close More than 500 holes, high machining accuracy requirements, and many flaw detection parts. Because the fuselage casting is heavy and the structure is very complicated, it is very difficult to cast the fuselage. Ductile iron diesel engin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08
Inventor 黄引平马敏团杨小建张威刘彦
Owner CSIC NO 12 RES INST
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