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The production process of materials suitable for diesel engine cylinder blocks and cylinder heads

A diesel engine and production process technology, applied in engine components, machines/engines, cylinder heads, etc., can solve the problems of proportional control, high production cost of cylinder block and cylinder head castings, and low strength of gray cast iron, and improve tensile strength. Strength and hardness, improve casting process performance, good casting processability

Active Publication Date: 2017-07-28
KUNMING YUNNEI POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The eutectic Sc ​​and carbon equivalent CE of diesel engine cylinder block and cylinder head materials are not high, and the casting process performance is not good
[0006] 2. The maturity RG of diesel engine cylinder block and cylinder head materials is low, the inoculation effect is not good, the production technology level is low, and the potential of the material itself has not been fully utilized
[0007] 3. The relative hardness RH of diesel engine cylinder block and cylinder head material is high, gray cast iron has low strength and high hardness, and the cutting performance is not good
[0008] 4. Among the three main metal materials, the proportion of pig iron and scrap steel is relatively high, which leads to high production costs of cylinder block and cylinder head castings. The heredity of pig iron and the inconsistency of scrap steel affect the quality of diesel engine cylinder blocks and cylinder head castings. Low sulfur carburizer and The cost per ton of alloying is high, and the cost of castings is difficult to control
[0009] 5. The chemical composition does not control the ratio between the elements, some elements are high in content but do not contribute to the material performance; the alloy elements in the scrap steel are not fully utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of production technology of diesel engine block, cylinder cover material, comprises the steps:

[0054] Step (1), equipment preparation: the equipment adopts medium frequency induction furnace;

[0055] Step (2), ingredients: in parts by weight, 37 parts of steel scrap, 20 parts of returned material, 38 parts of iron filings cake, and 1.5 parts of ZT-2 cast iron recarburizer;

[0056] Step (3), feeding: first add 28% of the cast iron recarburizer to the bottom of the electric furnace, and then add iron scraps, scrap steel and returned materials in sequence, and the remaining recarburizer should be added together with the returned materials. Before the remaining 9% of the charge is added, it is required that there is always a return charge to hold down the recarburizer;

[0057] Step (4), melting: power on and melt immediately after adding the returned material, use full power and uninterrupted melting during melting, control the melting temperature of the electr...

Embodiment 2

[0062] A kind of production technology of diesel engine block, cylinder cover material, comprises the steps:

[0063] Step (1), equipment preparation: the equipment adopts medium frequency induction furnace;

[0064] Step (2), ingredients: in parts by weight, 40 parts of steel scrap, 24 parts of returned material, 41 parts of iron filings cake, and 1.8 parts of ZT-2 cast iron recarburizer;

[0065] Step (3), feeding: first add 32% of the cast iron recarburizer to the bottom of the electric furnace, then add iron scraps, steel scrap and returned materials in sequence, and the remaining recarburizer should be added together with the returned materials. The remaining 11% of the furnace charge should be added before the remaining 11%, and it is required that there is always a return charge to hold down the carburizer;

[0066] Step (4), melting: power on and melt immediately after adding the returned materials, use full power and uninterrupted melting when melting, control the me...

Embodiment 3

[0071] A kind of production technology of diesel engine block, cylinder cover material, comprises the steps:

[0072] Step (1), equipment preparation: the equipment adopts medium frequency induction furnace;

[0073] Step (2), ingredients: in parts by weight, 38 parts of steel scrap, 21 parts of returned materials, 40 parts of iron filings, and 1.6 parts of ZT-2 cast iron recarburizer;

[0074] Step (3), feeding: first add 31% of the cast iron recarburizer to the bottom of the electric furnace, and then add iron scraps, scrap steel and returned materials in sequence, and the remaining recarburizer should be added together with the returned materials. The remaining 9.5% of the furnace charge should be added before, and it is required that there is always a return charge to hold down the carburizer;

[0075] Step (4), melting: power on and melt immediately after adding the returned material, use full power and uninterrupted melting during melting, control the melting temperatur...

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Abstract

The invention relates to a production process of materials suitable for diesel engine cylinder blocks and cylinder heads, and belongs to the technical field of casting. The process includes seven steps of equipment preparation, batching, feeding, melting, adjusting the chemical composition of molten iron, inoculating and pouring. The eutectic degree Sc of the diesel engine cylinder block and cylinder head material molten iron produced by the process of the present invention is controlled between 0.9-0.93, and the carbon equivalent CE is controlled between 3.95-4.1, which ensures the fluidity of molten iron and the casting process; at the same time, The maturity RG of molten iron can reach 113%, ensuring the inoculation effect, and the potential of the material itself has been fully utilized. The relative hardness RH of the prepared diesel engine cylinder block and cylinder head material can reach 0.84, and the cutting performance is excellent. This process has been applied for more than a year, and can reduce the cost of castings by 300 yuan per ton.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a low-cost, high-efficiency, high-quality material performance, stable diesel engine cylinder block, cylinder head material and a production process thereof. Background technique [0002] At present, the main material of diesel engine cylinder block and cylinder head is HT300, and the chemical composition content of molten iron is as follows: C: (2.9-3.3)%; Si: (1.4-1.7)%; Mn: (0.8-1.0)%; P<0.15% ; S<0.12%, using copper, tin, chromium for alloying treatment, carbon equivalent between CE3.8-3.85, low eutectic Sc, poor casting process performance. The existing electric furnace smelting production process of molten iron for diesel engine cylinder block and cylinder head materials mainly uses three main metal materials, pig iron, scrap steel and recycled materials, and auxiliary materials mainly include ferromanganese, ferrosilicon, low-sulfur carburizer, The main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C37/10B22D1/00F02F1/00F02F1/24
CPCB22D1/00C22C33/08C22C37/10F02F1/00F02F1/24
Inventor 李国钧刘星舟宋国富陈云龙张跃辉陶锋
Owner KUNMING YUNNEI POWER
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