A method for manufacturing a surface strengthening layer of a wear-resistant casting ball production mold and a mold having the same

A technology of surface strengthening layer and production method, which is applied in the direction of coating, casting mold, casting mold composition, etc., can solve the problems of high chromium content, high pouring temperature, and lower product quality of wear-resistant cast balls, and achieve anti-metal liquid burning Corrosion, improve process performance, improve the effect of service life

Active Publication Date: 2015-11-25
ANHUI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: due to the high chromium content of the wear-resistant casting ball, the pouring temperature is high, even as high as 1500°C, so the service life of the water glass sand iron mold is short and the cost is high
The heat dissipation of the coated sand mold is slow, which reduces the product quality, rough surface and low production efficiency

Method used

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  • A method for manufacturing a surface strengthening layer of a wear-resistant casting ball production mold and a mold having the same
  • A method for manufacturing a surface strengthening layer of a wear-resistant casting ball production mold and a mold having the same
  • A method for manufacturing a surface strengthening layer of a wear-resistant casting ball production mold and a mold having the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Ductile cast iron is used to cast iron molds for wear-resistant balls, and the molds are designed with cooling systems and exhaust systems.

[0039] The mold casting is machined to prepare it for the next step of nickel plating.

[0040] Nickel plating is carried out on the working surface of the mold, degreasing before plating, alkali cleaning, pickling, polishing surface roughness reaches △3.2, activated nickel plating, thickness above 70um.

[0041] The strengthening layer material is made of alloy powder, the particle size is -140+320 mesh, and the specific composition is as follows:

[0042]

[0043] The alloy powder is dried at 120°C for 1 hour, and it is used for subsequent spraying.

[0044] Roughen the nickel-plated layer to obtain a rough surface, ready for the next step of spray welding.

[0045] Before spray welding, the mold base is preheated to 350°C.

[0046] Spray welding method: two-step oxyacetylene spray welding.

[0047] Both spraying and reme...

Embodiment 2

[0055] Ductile cast iron is used to cast iron molds for wear-resistant balls, and the molds are designed with cooling systems and exhaust systems. The mold casting is machined to prepare it for the next step of nickel plating.

[0056] The working surface of the mold is nickel-plated, degreased before plating, alkali-washed, pickled, polished surface roughness reaches △3.2, activated nickel-plated, thickness above 75um.

[0057] The strengthening layer material is made of alloy powder, the particle size is -140+320 mesh, and the specific composition is as follows:

[0058]

[0059] Dry the powder at 120°C for 1 hour, and prepare it for subsequent spraying.

[0060] Roughen the nickel plating to obtain a rough surface, ready for the next step of spray welding.

[0061] Before spray welding, the mold base is preheated to 350°C.

[0062] Spray welding method: plasma spray welding.

[0063] The spray welding process is as follows:

[0064] Protective gas argon, flow rate 3...

Embodiment 3

[0073] Such as figure 2 Shown is a mold. The surface reinforcement layer is prepared by the above method on the working surface of the mold. The working surface includes the inner wall of the sprue gate, the surface of the wear-resistant ball cavity, and the surface of the molten iron buffer tank.

[0074] After adopting the above scheme, the high temperature resistant strengthening layer formed on the surface of the casting mold plays the role of preventing the ablation and adhesion of the metal solution.

[0075] The high temperature resistant strengthening layer has the advantages of good thermal conductivity, high temperature resistance, and the functions of preventing ablation and adhesion of molten metal. The combination strength of the coating and the mold is high, which greatly improves the service life of the mold.

[0076] The surface-strengthened mold does not need to brush the release agent before each casting, which reduces the labor intensity and makes the mech...

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Abstract

The invention discloses a surface strengthening layer of a wear-resistant casting ball production die, a preparation method thereof and a die with the surface strengthening layer. The surface strengthening layer comprises the following chemical components in percentage by weight: 22-40% of Cr, 5-7% of Co, 3-7% of Al, 0.2-0.6% of Y, 2.5-3.5% of B, 2.5-3.5% of Si, less than 1% of Fe and the balance of Ni. The surface strengthening layer has the functions of resisting high temperature, preventing oxidization, preventing ablation of molten metal, avoiding adhesion and omitting a release agent.

Description

technical field [0001] The invention belongs to the technical field of surface strengthening treatment of metal mold casting molds for grinding balls, and in particular relates to a method for manufacturing a surface strengthening layer of a wear-resistant casting ball production mold and a mold having the same. Background technique [0002] At present, there are mainly three types of molds for wear-resistant casting balls: green sand casting (suitable for small balls), water glass sand iron mold casting, and iron mold sand-coated (coated sand) casting. [0003] In the process of realizing the present invention, the inventors found at least the following problems in the prior art: due to the high chromium content of the wear-resistant casting ball, the pouring temperature is high, even as high as 1500°C, so the service life of the water glass sand iron mold is short and the cost is high. Long-term use of molten metal will cause problems such as collapse, melting loss, and cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C23C4/12C23C4/18C23C4/08B22C9/00C23C4/129C23C4/134
Inventor 黄仲佳刘明朗陈志浩黄仲师
Owner ANHUI POLYTECHNIC UNIV
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