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Special inoculant for centrifugally casting thin-wall dry cylinder liner

A centrifugal casting and inoculant technology, applied in the new inoculant field, can solve the problems of increasing the production cost of cylinder liner casting, limiting the use of low-cost iron filings, etc., and achieves the effects of improving toughness, improving graphite morphology and reducing costs.

Inactive Publication Date: 2014-07-02
SHIJIAZHUANG JINGANG KAIYUAN POWER SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The use of ferrosilicon or silicon barium with high silicon content limits the amount of low-cost iron filings to a certain extent and increases the production cost of cylinder liner casting

Method used

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  • Special inoculant for centrifugally casting thin-wall dry cylinder liner

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Embodiment 1

[0013] The chemical composition of the inoculant in this embodiment is Si: 450 grams, C: 200 grams, Ba: 35 grams, Ca: 8 grams, Al: 5 grams, Fe: 302 grams. When calculated in terms of mass percentage, Si is 45%, C is 20%, Ba is 3.5%, Ca is 0.8%, Al is 0.5%, and Fe is 30.2%.

[0014] When making the inoculant, the materials of the above components are crushed, mixed, granulated and other processes to make the inoculant. That is, put the pre-customized silicon-barium alloy particles, micro-sulfur high-precision crystal graphite particles and other materials into the WZL type gravity-free mixer in proportion. The mixing time is 3 to 5 minutes. After sampling and checking the ingredients, store them to prevent moisture. Just keep it as a spare.

[0015] The following is a list of the chemical components of the inoculants with several components frequently used in the production obtained from the test. The measurement unit of the chemical components in the table is the mass percent...

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Abstract

The invention discloses a special inoculant for centrifugally casting a thin-wall dry cylinder liner, comprising the following chemical constituents by mass ratio: 45-50% of Si, 20-25% of C, 3.5-5% of Ba, 0.8-1.5% of Ca, 0.5-1% of Al, and the balance of Fe, wherein C is high-purity crystal graphite. The thin-wall dry cylinder liner can be centrifugally cast by using the inoculant provided by the invention so as to strongly promote graphitization when the cylinder liner is cast on the basis of uniformity of sections of the cylinder liner, and therefore, graphite form of a cylinder liner cast blank can be improved, graphite form is converted from A+D type into A type, and toughness of the cylinder liner can be greatly improved. At the same time, cylinder liner materials can be configured to increase match-into proportion of melt-down iron, and reduce manufacturing cost of the cylinder liner.

Description

technical field [0001] The invention belongs to the technical field of casting and smelting molten iron inoculation treatment, in particular to a new inoculant for casting cylinder liner blanks of internal combustion engines. Background technique [0002] The cylinder liner is a key component in the internal combustion engine, and its quality largely determines the overhaul period of the internal combustion engine. Among the many types of cylinder liners, the use of cast iron cylinder liners is still the largest. Cast iron cylinder liners are divided into thick-walled wet-type cylinder liners and thin-walled dry-type cylinder liners according to the structure. The wall thickness of thick-walled wet-type cylinder liners is generally greater than 5mm. When the internal combustion engine is working, the outer wall of the cylinder liner needs to be cooled by coolant. The wall thickness of the thin-walled dry cylinder liner is generally about 2mm, and the outer wall of the cylin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08
Inventor 王季明毛永卫王银力张彩霞
Owner SHIJIAZHUANG JINGANG KAIYUAN POWER SCI & TECH
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