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Composite gradient coating thermally sprayed on surface of screw rod of injecting and molding machine and a method for preparing same

A technology of injection molding machine screw and gradient coating, which is applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of thermal spraying coating polishing and grinding damage, etc., achieve good machinability and improve use The effect of high performance and hardness

Active Publication Date: 2012-07-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the field of screw manufacturing at home and abroad, thermal spraying technology has not been widely used. The main reason is that it has not been able to effectively solve the problem of damage to the thermal sprayed coating on the screw during surface mirror polishing and service.

Method used

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  • Composite gradient coating thermally sprayed on surface of screw rod of injecting and molding machine and a method for preparing same
  • Composite gradient coating thermally sprayed on surface of screw rod of injecting and molding machine and a method for preparing same
  • Composite gradient coating thermally sprayed on surface of screw rod of injecting and molding machine and a method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this embodiment, the injection molding machine screw is used as the substrate to prepare a composite gradient coating on the surface of the substrate. The composite gradient coating is composed of a WC-12Co transition coating on the surface of the substrate and a Ni60 coating on the surface of the transition layer. The thickness of the WC-12Co coating is 150 μm, and the thickness of the Ni60 coating is 200 μm. The WC-12Co transition coating is prepared by thermal spraying of commercially available 15-45 μm WC-12Co powder, and the Ni60 coating is prepared by commercially available 20-40 μm Ni60 powder by thermal spraying. like figure 2 Shown, the concrete preparation method of this composite gradient coating is as follows:

[0056] 1. Before spraying, the substrate 4 is cleaned, degreased and rusted, and then 60 mesh brown corundum sand is used for surface blasting pretreatment to make its roughness meet the spraying requirements;

[0057] 2. The surface of the sub...

Embodiment 2

[0068] In this embodiment, the injection molding machine screw is used as the substrate to prepare a composite gradient coating on the surface of the substrate. The composite gradient coating is composed of a WC-10Co-4Cr transition coating on the surface of the substrate and a Ni60 coating on the surface of the transition layer. composition, the thickness of the WC-10Co-4Cr coating is 150 μm, and the thickness of the Ni60 coating is 200 μm. The WC-10Co-4Cr transition coating is prepared by thermal spraying of commercially available 15-45μm WC-10Co-4Cr powder, and the Ni60 coating is prepared by commercially available 20-40μm Ni60 powder by thermal spraying. .

[0069] The specific preparation method of the above-mentioned composite gradient coating is the same as that in Example 1, except that the powder 3 is WC-10Co-4Cr powder and Ni60 respectively, and the composite gradient coating on the surface of the substrate 4 is obtained.

[0070] The following performance test is ca...

Embodiment 3

[0075] In this embodiment, the injection molding machine screw is used as the substrate, and a composite gradient coating is prepared on the surface of the substrate. The composite gradient coating is made of Cr located on the surface of the substrate. 3 C 2 -NiCr transition coating, and the Ni60 coating on the surface of the transition layer, the Cr 3 C 2 -NiCr coating thickness is 110μm, Ni60 coating thickness is 180μm. Cr 3 C 2 -NiCr transition coating is made of commercially available 15-45μm Cr 3 C 2 -NiCr powder is prepared by thermal spraying method, and Ni60 coating is prepared by commercially available Ni60 powder of 20-40 μm by thermal spraying method.

[0076] The specific preparation method of the above-mentioned composite gradient coating is the same as the preparation method in Example 1, except that the powder 3 is respectively Cr 3 C 2 -NiCr powder and Ni60 to obtain a composite gradient coating on the surface of the substrate 4.

[0077] The following...

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Abstract

The invention discloses a composite gradient coating thermally sprayed on the surface of a screw rod of an injecting and molding machine and a method for preparing the same. The composite gradient coating is characterized in that a metal ceramic hard alloy coating on the surface of the matrix of the screw rod is used as a transitional layer, and a surface polishing and processing alloy layer is thermally sprayed on the surface of the transitional layer. Compared with the prior coating on the surface of the screw rod, the composite gradient coating has excellent surface polishing and processing performance, matrix combination strength, friction and wear resistance, high temperature resistance and corrosion resistance, can greatly improve the use performance of the screw rod and significantly prolong the service life of the screw rod, can replace the widely-used nitriding process, spraying-welding process and other screw rod surface processing process and has good application prospect and economic benefit.

Description

technical field [0001] The invention relates to the technical field of surface treatment of the screw of an injection molding machine, in particular to a thermal spray composite gradient coating on the surface of a screw of an injection molding machine and a preparation method thereof. Background technique [0002] The barrel and the screw are the core components of the injection molding machine. The barrel and the screw are a pair of moving pairs. Compared with the barrel, the screw is more prone to failure and damage due to surface friction and wear. The loss caused by screw failure is staggering. According to the statistics of North America in 1986, the loss of screw failure has exceeded 2.5 billion US dollars. In China, although there is no corresponding statistical data, due to the huge amount of domestic injection molding machines and extruders, screw failure will inevitably lead to huge economic losses. Therefore, solving the problem of premature failure of the screw...

Claims

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Application Information

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IPC IPC(8): C23C4/10C23C4/06C23C4/12C23C4/073C23C4/08C23C4/129
Inventor 袁建辉丁思月李华黄晶雷强薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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