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Bottom ring material DPR-D5 of piston rings of marine diesel engine and casting method thereof

A marine diesel engine, DPR-D5 technology, applied in the direction of piston rings, mechanical equipment, engine components, etc., can solve the problems of long order cycle and high cost, and achieve high bending strength, moderate hardness, good wear resistance and corrosion resistance Effect

Active Publication Date: 2017-03-22
大连锦航新能源设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are problems with imported piston rings and bottom rings: first, the cost is getting higher and higher, and second, the order cycle is long

Method used

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  • Bottom ring material DPR-D5 of piston rings of marine diesel engine and casting method thereof
  • Bottom ring material DPR-D5 of piston rings of marine diesel engine and casting method thereof
  • Bottom ring material DPR-D5 of piston rings of marine diesel engine and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The casting method of the piston ring bottom ring of marine diesel engine comprises the following steps:

[0029] 1. Ingredients according to the following mass percentage: C: 3.0%, Si: 1.4%, Mn: 0.84%, Cr: 0.1%, Mo: 0.49%, Cu: 0.99%, Ti: ≤0.05%, P: 0.1%, S ≤0.05%, Mg: ≤0.005%, the rest is Fe and unavoidable impurities;

[0030] 2. Melting: Melt the ingredients in step 1 into molten iron with a frequency conversion induction furnace. The casting is a cylindrical blank with a diameter of 350mm and a wall thickness of 12mm. Adjust the furnace temperature to 1450°C and add 0.35% inoculant.

[0031] The matrix structure of cast alloy cast iron DPR-D5 is pearlite, a small amount of ferrite and hard phase (cementite + phosphorus eutectic), and the force elastic modulus E reaches 112kN / mm 2 , Brinell hardness is HB219, bending strength Rb=560N / mm 2 .

Embodiment 2

[0033] The casting method of the piston ring bottom ring of marine diesel engine comprises the following steps:

[0034] 1. Ingredients according to the following mass percentage: C: 3.2%, Si: 1.4%, Mn: 0.84%, Cr: 0.1%, Mo: 0.49%, Cu: 0.99%, Ti: ≤0.05%, P: 0.1%, S ≤0.05%, Mg: ≤0.005%, the rest is Fe and unavoidable impurities;

[0035] 2. Melting: Melt the ingredients in step 1 into molten iron with a frequency conversion induction furnace. The casting is a cylindrical blank with a diameter of 700mm and a wall thickness of 23mm. Adjust the furnace temperature to 1420°C and add 0.28% inoculant.

[0036] The matrix structure of cast alloy cast iron DPR-D5 is pearlite, a small amount of ferrite and hard phase (cementite + phosphorus eutectic), and the force elastic modulus E reaches 120kN / mm 2 , Brinell hardness is HB226, bending strength Rb=600N / mm 2 .

Embodiment 3

[0038] The casting method of the piston ring bottom ring of marine diesel engine comprises the following steps:

[0039] Carry out smelting when the air temperature is -15 DEG C according to the step of Embodiment 2, pouring temperature is 1363 DEG C, all the other are the same as Embodiment 2.

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Abstract

The invention discloses a bottom ring material DPR-D5 of piston rings of a marine diesel engine and a casting method of the bottom ring material DPR-D5 of the piston rings of the marine diesel engine. A small amount of copper, molybdenum and nickel are added to cast iron, pearlite can be refined, and graphite can also be refined; chromium is added, so that the mechanical property and the heat resistance can be improved and enhanced; and manganese is added and can be dissolved in a matrix and a carbide, the matrix can be reinforced, the stability of the carbide can be improved, and formation of fine pearlite can be promoted. The graphite form of the cast alloy iron DPR-D5 is flaky graphite IA3-5, the matrix structure of the cast alloy iron DPR-D5 is the pearlite, a small amount of ferrite and a hard phase (comprising cementite and iron phosphide eutectic); detection results show that the cast alloy iron DPR-D5 has the advantages of being moderate in hardness, high in bending strength, good in wear resistance and corrosion resistance and the like, various technical indexes of the cast alloy iron DPR-D5 all reach the CF5 standard requirements of the MAN-B&W material standard, and the cast alloy iron DPR-D5 can replace the imported material CF5 to be used for casting of a bottom ring of the piston rings of the MAN-B&W diesel engine; and in this way, the manufacturing cost is reduced, and the order cycle time is shortened.

Description

technical field [0001] The invention belongs to the casting technology of alloy cast iron piston rings, in particular to the bottom ring material and casting method of marine diesel engine piston rings. Background technique [0002] There are usually 4 piston rings in the marine diesel engine cylinder, the first piston ring is called the top ring, and the other three piston rings are called the bottom ring. The impact force of the first piston ring is greater than that of the following piston rings. Therefore, the materials of the top ring and the bottom ring are different. Piston ring bottom ring is a key part in the combustion chamber of marine diesel engine. During the working process, the piston ring bottom ring not only bears high temperature and high pressure, but also bears severe wear and heavy load impact. Its performance directly affects the working efficiency and quality of the diesel engine. The quality of the bottom ring material of the piston ring directly de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08F02F5/00
CPCC22C33/08C22C37/06C22C37/10F16J9/26
Inventor 王欣葛春青卫学红
Owner 大连锦航新能源设备有限公司
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