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Manufacturing method of cast acicular constituent alloy ash cast iron cylinder jacket

A manufacturing method and bainite technology, applied in the direction of cylinders, cylinder heads, engine components, etc., can solve the problem of difficult bainite, and achieve the effect of reducing foreign exchange expenditure, considerable social benefits, and reducing production costs

Inactive Publication Date: 2005-06-22
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this material can only be obtained by austempering, and it is very difficult to obtain bainite in the as-cast state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] 1. Process

[0014] 1. Ingredients, chemical composition controlled at C 2.6-3.3%, Si 1.7-2.5%, S≤0.1%, P≤0.15%, Cr0.1-0.3%; Mn≤0.8%, Ni 0.3-0.5%, Mo 0.6 ~1.0%, Cu0.3~1.0%;

[0015] 2. Fire inoculation: use silicon barium inoculant to inoculate in the process of tapping molten iron, and the inoculation amount is 0.4-0.9%.

[0016] 3. Pour an appropriate amount of molten iron into the mold of the centrifugal pouring machine. After 10-30 seconds, water the casting mold for 30-70 seconds to cool the cylinder liner, and push the blank out of the mold when the temperature of the blank drops below 850°C.

[0017] 4. Cooling: put the blank on the cooler, air-cool or air-cool for 3-6 minutes to reduce the temperature of the blank to 400-500°C (low alloys must be air-cooled), and rough-process the blank that has been air-cooled or air-cooled to obtain a semi-finished product .

[0018] 5. Temper the semi-finished cylinder liner in a heat treatment furnace. The tempering temp...

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PUM

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Abstract

The invention discloses a method for manufacturing a gray cast iron cylinder liner of as-cast bainite alloy, which is processed according to the following steps: (1) 65-75% of 18# pig iron and 20-30% of high-quality steel scrap are selected, wherein the combination of pig iron and high-quality steel scrap The sum of the component contents is 100% for molten iron smelting, and the chemical composition is controlled at C 2.6-3.3%, Si 1.7-2.5%, S≤0.1%, P≤0.15%, Cr0.1-0.3%; (2) adding alloy elements , control its composition as, Mn≤0.8%, Ni 0.3~0.5%, Mo 0.6~1.0%, Cu0.3~1.0%; (3) Cooling: put the high-temperature blank that is centrifugally cast out of the mold on the cooler, air-cooled Or air cooling for 3-6 minutes to reduce the temperature of the blank to 400-500°C, and put the blank that has been air-cooled or air-cooled into a slow cooling box to allow it to cool slowly. (4) Temper the semi-finished cylinder liner in a heat treatment furnace. When the tempering temperature is 500°C±20°C, keep it warm for 1.5-3 hours, and then cool it at 40-120°C / h.

Description

technical field [0001] The invention relates to a manufacturing method of a cast bainite alloy gray cast iron cylinder liner. Background technique [0002] With the development of science and technology, the requirements for automobile and construction machinery engines are getting higher and higher. As the heart of the engine, the cylinder liner puts forward higher requirements for its material. The traditional phosphorus alloy cast iron cylinder liner and boron alloy cast iron cylinder liner , molybdenum-chromium-copper alloy cylinder liners, molybdenum-nickel-copper alloy cylinder liners, etc. are increasingly unable to meet the requirements of high-power and high-performance engines. For example, the Cummins C series engine is a joint venture between Dongfeng Group Corporation of my country and Cummins Corporation of the United States. Imported from Cummins Corporation of the United States The world's advanced medium and heavy-duty engines have the characteristics of advan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/02F02F1/08
Inventor 侯起飞孙世贵党增军王中营
Owner ZYNP GRP
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