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Marine diesel engine piston ring top ring material DPR-DGIII and casting method thereof

A marine diesel engine, DPR-DGIII technology, applied in the field of marine diesel engine piston ring top ring material and its casting, can solve problems such as high cost and long order cycle, and achieve high bending strength, improved impact resistance, wear resistance and resistance. good corrosive effect

Active Publication Date: 2017-03-29
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

The problems of imported piston rings and top rings: first, the cost is getting higher and higher, and second, the order cycle is long

Method used

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  • Marine diesel engine piston ring top ring material DPR-DGIII and casting method thereof
  • Marine diesel engine piston ring top ring material DPR-DGIII and casting method thereof
  • Marine diesel engine piston ring top ring material DPR-DGIII and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The casting method of the piston ring top ring of marine diesel engine comprises the following steps:

[0043] 1. According to the following mass percentage: C: 3.2%; Si: 2.2%; Mn: 0.6%; Cr: 0.07%; Mo: 0.4%; Ni: 0.25%; Cu: 1.0%; Sn: 0.05%; 0.15%; S≤0.02%; Mg: ≤0.03%, the rest is Fe and unavoidable impurities;

[0044] 2. Smelting: Use a frequency conversion induction furnace to melt the ingredients in step 1 into molten iron. The casting is a cylindrical blank with a diameter of 350 mm and a wall thickness of 12 mm. 0.028%, the pouring temperature is 1380°C.

[0045] The cast alloy cast iron DPR-DGⅢ graphite has a creep rate of 90%, the matrix structure is pearlite, a small amount of ferrite and hard phase (cementite + phosphorus eutectic), and the force elastic modulus E reaches 140kN / mm 2 , Brinell hardness is HB273; bending strength Rb=860N / mm 2 .

Embodiment 2

[0047] The casting method of the piston ring top ring of marine diesel engine comprises the following steps:

[0048] 1. Ingredients according to the following mass percentage: C: 3.5%; Si: 2.8%; Mn: 0.7%; Cr: 0.09%; Mo: 0.4%; Ni: 0.4%; Cu: 1.2%; Sn: 0.05%; 0.15%; S≤0.02%; Mg: ≤0.03%, the rest is Fe and unavoidable impurities;

[0049] 2. Smelting: Use a frequency conversion induction furnace to melt the ingredients in step 1 into molten iron. The casting is a cylindrical blank with a diameter of 800 mm and a wall thickness of 25 mm. 0.008%, the pouring temperature is 1340°C.

[0050] The cast alloy cast iron DPR-DGⅢ graphite has a creep rate of 93%, the matrix structure is pearlite, a small amount of ferrite and hard phase (cementite + phosphorus eutectic), and the force elastic modulus E reaches 132kN / mm 2 , Brinell hardness is HB269, bending strength Rb=760N / mm 2 .

Embodiment 3

[0052] The casting method of the piston ring top ring of marine diesel engine comprises the following steps:

[0053] According to embodiment 2, the batching is smelted when the air temperature is -15°C, the furnace temperature is 1433°C, and the pouring temperature is 1343°C, and the rest are the same as in embodiment 2.

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Abstract

The invention discloses a marine diesel engine piston ring top ring material DPR-DGIII and a casting method. Alloy cast iron DPR-DGIII formed through pouring of a small number of copper alloy elements, manganese alloy elements, molybdenum alloy elements and other alloy elements is added in cast iron, the graphite creep ratio reaches 80% or above, the content of pearlite in a matrix structure is 95% or above, the bending strength Rb is larger than 740 N / mm<2>, the elasticity modulus E can reach 131-159kN / mm<2>, the brinell hardness HB ranges from 250 to 290, and the requirement of foreign imported piston ring material technology index is met. The alloy cast iron DPR-DGIII has the beneficial effects that hardness is moderate, bending strength is high, abrasion and corrosion resistance is good, and the impact resistance is greatly improved; and the using requirement of modern high-explosive-power diesel engines is met, various technology indexes meet the CV1 standard requirement of the MAN-B&W material standard, and the marine diesel engine piston ring top ring material DPR-DGIII can replace imported materials CV1 and is used for MAN-B&W diesel engine top rings.

Description

technical field [0001] The invention belongs to the casting technology of an alloy cast iron piston ring, in particular to a top ring material of a marine diesel engine piston ring and a casting method thereof. 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 top ring is a key part in the combustion chamber of marine diesel engine. During the working process, the top ring of the piston 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 top ring material of the piston ring direc...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/08C22C33/08
CPCC22C33/08C22C37/08C22C37/10
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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