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Connecting coating for casting babbitt metal on bearing bush and preparation process of connecting coating

A technology of Babbitt alloy and preparation process, which is applied in the direction of metal material coating process, coating, shaft, etc., can solve the problems of affecting the bonding quality, environmental equipment hazards, outdated and simple methods, etc., to achieve efficient and clean preparation process and improve bonding Powerful, easy-to-use effects

Inactive Publication Date: 2021-02-02
MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are a series of problems in the tinning process of bearing bushes in industrial production: the method is outdated and crude, the process is difficult to control, and the requirements for operator experience and level are relatively high; workpiece preheating and tin liquid require high temperature and high energy consumption; melting temperature 1. It is difficult to control the thickness and uniformity of the hanging tin layer, which seriously affects the subsequent casting quality; the metal compound formed by hanging tin is hard and brittle. If it cannot completely penetrate into the joint surface layer of Babbitt alloy and bottom tile, it will affect their quality. Combined with quality; the use of toxic and corrosive substances such as zinc chloride is harmful to the environment and equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Bottom tile material: aluminum nickel bronze (CuAl10Fe5Ni5).

[0031](1) Degreasing and decontamination

[0032]Degrease and clean the surface of the bottom tile to be repaired. Use absolute ethanol to clean the area to be repaired and the surrounding coating surface. Wipe 3 times to remove surface oil, dust and other contaminants.

[0033](2) Sandblasting

[0034]Use masking tape to protect the parts that may be sprayed outside the sandblasting range.

[0035]The self-circulating sandblasting machine is used to perform sandblasting on the surface to be repaired. The sandblasting uses 20 mesh white corundum abrasive grains and dry compressed air, the pressure is 0.30MPa, the sandblasting distance is 100mm, and the surface roughness after sandblasting>Ra6.0μm.

[0036](4) Spraying

[0037]① Use flame to preheat the workpiece, the preheating temperature is ≥50℃.

[0038]②Spraying process parameters:

[0039]Use pure copper wire as raw material.

[0040]Supersonic arc spraying: air pressure 0.5MPa, voltage 36...

Embodiment 2

[0044]Base tile material: aluminum alloy (AlSn6Cu).

[0045](1) Degreasing and decontamination

[0046]Degrease and clean the surface of the bottom tile to be repaired. Use absolute ethanol to clean the area to be repaired and the surrounding coating surface. Wipe 3 times to remove surface oil, dust and other contaminants.

[0047](2) Sandblasting

[0048]Use masking tape to protect the parts that may be sprayed outside the sandblasting range.

[0049]A self-circulating sandblasting machine is used to perform sandblasting on the surface to be repaired. For sandblasting, 20 mesh white corundum abrasive grains and dry compressed air are used.

[0050](4) Spraying

[0051]① Use flame to preheat the workpiece, the preheating temperature is ≥50℃.

[0052]②Spraying process parameters:

[0053]Use pure copper wire as raw material.

[0054]Supersonic arc spraying: air pressure 0.5MPa, voltage 38V, current 220A, spraying distance: 110mm, spraying speed: 800mm / s.

[0055]③Coating thickness: 200μm.

[0056]After casting the babb...

Embodiment 3

[0058]Base tile material: steel (45#).

[0059](1) Degreasing and decontamination

[0060]Degrease and clean the surface of the bottom tile to be repaired. Use absolute ethanol to clean the surface to be repaired and the surrounding coating surface, wipe twice to remove surface oil, dust and other contaminants.

[0061](2) Sandblasting

[0062]Use masking tape to protect the parts that may be sprayed outside the sandblasting range.

[0063]The self-circulating sandblasting machine is used to perform sandblasting on the surface to be repaired. The sandblasting uses 16 mesh brown corundum abrasive grains and dry compressed air, the pressure is 0.40MPa, the sandblasting distance is 150mm, and the surface roughness after sandblasting>Ra6.0μm.

[0064](4) Spraying

[0065]① Use flame to preheat the workpiece, the preheating temperature is ≥50℃.

[0066]②Spraying process parameters:

[0067]Use pure copper powder as raw material.

[0068]Supersonic flame spraying: kerosene flow rate: 20L / h, oxygen flow rate: 750L / min,...

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Abstract

The invention discloses a connecting coating for casting babbitt metal on a bearing bush and a preparation process of the connecting coating. The connecting coating with a thickness of 150-500 micronsis prepared on a bottom bush by adopting a thermal spraying mode, and the connecting coating is copper with the purity of more than or equal to 99.5%. The process comprises the following specific steps: (1) deoiling and decontaminating the surface of the bottom bush; (2) performing sand blasting and texturing; and (3) spraying copper wires or copper powder to form the connecting coating with a certain thickness. According to the connecting coating prepared through the method, quality of the subsequent casting process can be guaranteed, and bonding strength between the babbitt metal and the bottom bush is improved. Compared with a common tinning process at present, the process has a series of remarkable advantages of low cost, low energy consumption, no pollution, simplicity in operation and the like.

Description

Technical field[0001]The invention relates to a connecting coating used for casting a babbitt alloy for bearing bushes and a preparation process thereof, and belongs to the technical field of coatings.Background technique[0002]In engineering practice, Babbitt alloy is usually cast on the bearing bush, and its excellent anti-friction performance is used to achieve the purpose of reducing wear. Babbitt alloy is a low melting point bearing alloy with hard phase particles uniformly distributed on the soft phase matrix. Compared with other bearing materials, babbitt alloy has better adaptability and indentation, as well as anti-friction properties, making it widely used in large marine diesel engines, turbines, alternators, and other mining machinery and large rotating machinery Wait. Bearing shells are also called sliding bearings, which are directly used in conjunction with the shaft. There are three ways to combine the babbitt alloy wear-resistant layer and the bottom tile: rolling, w...

Claims

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Application Information

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IPC IPC(8): F16C33/08F16C33/14C23C4/129C23C4/02C23C4/08C23C4/131B22D19/00
CPCB22D19/00C23C4/02C23C4/08C23C4/129C23C4/131F16C33/08F16C33/14F16C2204/10F16C2204/20F16C2204/60F16C2223/42
Inventor 陈小明刘伟刘德有赵坚方勇罗有德熊智郭鸿鹅杨聃李德红陈志雄毛鹏展张凯霍嘉翔伏利
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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