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Centrifugal casting coating for cylinder liners and preparation method thereof

A centrifugal casting and cylinder liner technology, which is applied in casting molding equipment, coatings, casting molds, etc., can solve the problems of unfavorable cylinder liner blank conformal casting, unfavorable metallographic structure, thick coating thickness, etc., and achieve heat insulation performance Excellent, good metallographic structure, and the effect of reducing machining allowance

Inactive Publication Date: 2009-10-14
YANGZHOU WUTINGQIAO CYLINDER LINER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing centrifugal casting coatings for cylinder liners generally use silica powder and bentonite as the main body, and have poor thermal insulation performance. The coating thickness is relatively thick (1-2 mm), and the drying time is long. Flowing, it is easy to cause the coating to be thicker where it should not be thicker, and thinner where it should not be thinner, which is not conducive to the conformal casting of cylinder liner blanks, and is not conducive to obtaining an ideal metallographic structure

Method used

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  • Centrifugal casting coating for cylinder liners and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get the following raw material parts by weight:

[0031] Silica powder: 100

[0032] Sodium bentonite: 12

[0033] High alumina bauxite: 22

[0034] Sodium alkylbenzene sulfonate: 0.7

[0035] Water: 150,

[0036] Among them: the silica powder particle size of 150-180 mesh accounts for 30%, the particle size of 200-250 mesh accounts for 45%, and the particle size of 250-300 mesh accounts for 25%. The particle size of sodium bentonite and high alumina bauxite are both 200-350 mesh.

[0037] First dry the above-mentioned high-alumina bauxite at a temperature of 105±10°C, then pulverize it, and then carry out winnowing to remove impurities, then put it into a rotary kiln for roasting, the highest temperature for roasting is 1100°C, and then pulverize after roasting. Then carry out 3 to 4 air separation and classification to obtain high alumina bauxite powder with a particle size of 200-350 mesh.

[0038] Take 22 parts by weight of the prepared high-alumina bauxite as...

Embodiment 2

[0046] Get the following raw material parts by weight:

[0047] Silica powder: 100

[0048] Sodium bentonite: 16

[0049] High alumina bauxite: 25

[0050] Sodium stearate: 0.8

[0051] Water: 170,

[0052] Among them: the silica powder particle size of 150-180 mesh accounts for 30%, the particle size of 200-250 mesh accounts for 45%, and the particle size of 250-300 mesh accounts for 25%. The particle size of sodium bentonite and high alumina bauxite are both 200-350 mesh.

[0053] First dry the above-mentioned high-alumina bauxite at a temperature of 105±10°C, then pulverize it, and then carry out winnowing to remove impurities, then put it into a rotary kiln for roasting, the highest temperature for roasting is 1100°C, and then pulverize after roasting. Then carry out 3 to 4 air separation and classification to obtain high alumina bauxite powder with a particle size of 200-350 mesh.

[0054] Take 25 parts by weight of the prepared high-alumina bauxite as an insulating...

Embodiment 3

[0057] Get the following raw material parts by weight:

[0058] Silica powder: 100

[0059] Sodium bentonite: 20

[0060] High alumina bauxite: 30

[0061] Sodium stearate: 1.15

[0062] Water: 200,

[0063] Among them: the silica powder particle size of 150-180 mesh accounts for 30%, the particle size of 200-250 mesh accounts for 45%, and the particle size of 250-300 mesh accounts for 25%. The particle size of sodium bentonite and high alumina bauxite are both 200-350 mesh.

[0064] First dry the above-mentioned high-alumina bauxite at a temperature of 105±10°C, then pulverize it, and then carry out winnowing to remove impurities, then put it into a rotary kiln for roasting, the highest temperature for roasting is 1100°C, and then pulverize after roasting. Then carry out 3 to 4 air separation and classification to obtain high alumina bauxite powder with a particle size of 200-350 mesh.

[0065] Take 30 parts by weight of the prepared high-alumina bauxite as an insulatin...

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Abstract

The invention discloses a centrifugal casting coating for cylinder liners and a preparation method thereof. The centrifugal casting coating comprises the following components according to parts by weight: 100 parts of refractory aggregate, 12 to 20 parts of binder, 22 to 30 parts of heat-insulating agent, 0.7 to 1.15 parts of dispersant and 150 to 200 parts of water. The preparation method comprises the following steps: mixing and milling the refractory aggregate, the binder and the heat-insulating agent in a sand roller mill; feeding the mixed and milled components and the water into a stirring cask and stirring for 5 to 6 hours at the rotating speed of 120 to 180 rp / min; and adding sodium alkylbenzene sulfonate or sodium stearate and further stirring for 20 to 30 min to obtain the centrifugal casting coating for cylinder liners. The invention has the advantages that the selected materials are scientific and reasonable, the process is simple and advanced, and the coating has good sintering performance, high-temperature resistance and heat-insulation performance. Compared with the existing coatings, the coating layer, which is thinner and easily dried, has good heat-insulating effect, ensures that the castings can easily obtain good metallurgical structure, prolongs the service life of moulds and realizes the shape-following casting of the centrifugal casting cylinder liners.

Description

technical field [0001] The invention relates to a cylinder liner centrifugal casting coating and a preparation method of the coating, belonging to the technical field of casting coatings. Background technique [0002] The existing centrifugal casting coatings for cylinder liners generally use silica powder and bentonite as the main body, and have poor thermal insulation performance. The coating thickness is relatively thick (1-2 mm), and the drying time is long. Flowing will easily cause the coating to be thicker where it should not be thicker, and thinner where it should not be thinner, which is not conducive to the conformal casting of cylinder liner blanks, and is not conducive to obtaining an ideal metallographic structure. Contents of the invention [0003] The object of the present invention is to overcome the above-mentioned defects in the prior art, and provide a cylinder liner centrifugal casting coating with better thermal insulation performance, thinner coating ...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22D13/10
Inventor 周国平肖月宁徐宏峰李文连
Owner YANGZHOU WUTINGQIAO CYLINDER LINER
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