Production method for manufacturing high-precision grinding tool through electron beam fused diamond

Abstract

The invention discloses a production method for manufacturing a high-precision grinding tool through electron beam fused diamond. The production method comprises the steps that metal alloy powder slurry is prepared; uniformly spraying the prepared metal alloy powder slurry on the surface of a steel substrate; diamond micro-powder particles are uniformly sprayed and adhered to the surface of the metal alloy powder slurry; and heating the metal alloy powder slurry by using electron beams in a vacuum protection atmosphere until the alloy powder is molten, and fusing and fixing the diamond micro-powder particles and the alloy on the surface of the steel substrate after cooling to form the grinding tool. The high-precision grinding tool obtained through the production method of the high-precision grinding tool has the advantages of being high in grinding efficiency, long in service life, high in grinding precision and the like, the special-type precision grinding tool with a slender base body, a thin wall and fine diamonds can be manufactured through the production method, in addition, the characteristics that electron beams are high in energy density and high in heating and cooling speed are utilized, the diamonds are small in thermal damage, and the quality of the diamonds is improved. And the grinding tool substrate is almost free of thermal deformation.

Description

Technical Field

[0001] The invention belongs to the field of diamond grinding tool manufacturing, in particular to a production method for manufacturing high-precision grinding tools by electron beam fusion diamond. Background Art

[0002] Ceramic materials such as zirconia, alumina, silicon carbide, silicon nitride, boron carbide, and boron nitride have the advantages of high strength, high hardness, high toughness, acid and alkali resistance, corrosion resistance, and high chemical stability. They have become important materials in the aviation, aerospace, military industry, consumer electronics, and automotive industries.

[0003] Diamond abrasives are needed to process these ceramics. Diamond abrasives can be divided into electroplated abrasives, sintered abrasives, and brazed abrasives according to different manufacturing processes. The bonding strength between diamond and binder of abrasives made by electroplating and sintering processes is low, and diamond is easy to fall off. Abrasives made by brazing process are achieved by resistance heating in a vacuum furnace. Diamond and binder are firmly bonded, but due to the slow heating speed, diamond is subjected to high temperature for a long time, thermal damage is serious, diamond strength is reduced, and it is easy to break. Moreover, only coarse-grained diamonds can be brazed, not fine-grained diamonds. Therefore, the current process cannot produce high-bonding-strength fine-grained diamond precision abrasives. Summary of the invention

[0004] The purpose of the invention is to provide a production method for producing high-precision grinding tools by electron beam fusion diamond, which can produce high-bonding strength fine-grained diamond precision grinding tools.

[0005] Technical solution: The production method of electron beam fused diamond to produce high-precision grinding tools of the present invention comprises the following steps:

[0006] Step 1, preparing a metal alloy powder slurry;

[0007] Step 2, spraying the prepared metal alloy powder slurry evenly on the surface of the steel substrate;

[0008] Step 3, spraying diamond micropowder particles evenly onto the surface of the metal alloy powder slurry;

[0009] Step 4: In a vacuum protective atmosphere, the metal alloy powder slurry is heated by an electron beam until the alloy powder is melted. After cooling, the diamond powder particles are fused with the alloy and fixed on the surface of the steel substrate to form a grinding tool.

[0010] Furthermore, in step 1, when preparing the metal alloy powder slurry: the alloy powder and glue are evenly mixed in a mass ratio of 1:1 to 2.

[0011] Furthermore, the alloy powder is Cu-Co-Cr-Fe alloy powder, Ag-Cu-Sn-In-Ti alloy powder or Cu-Ni-Sn-Ti alloy powder.

[0012] Furthermore, the glue comprises the following components by mass percentage: 20-25% polyvinyl alcohol, 15-20% ammonium acryloyl, 5-8% sodium hydroxide, 3-5% ethanol, and the balance is water.

[0013] Furthermore, in step 2, after spraying is completed, the thickness of the metal alloy powder slurry sprayed on the surface of the steel substrate after solidification is 130-150% of the average particle size of the diamond micropowder particles.

[0014] Furthermore, in step 3, after spraying and adhering, the average gap between two adjacent diamond micro-powder particles on the surface of the metal alloy powder slurry is 2 to 3 times the average particle size of the diamond micro-powder particles.

[0015] Furthermore, in step 3, the particle size range of the diamond micropowder particles is 500 to 10000 mesh.

[0016] Furthermore, in step 4, when the metal alloy powder slurry is heated by an electron beam, the fusion temperature is the melting point of the alloy powder + 60 to 100°C.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the high-precision grinding tool obtained by the production method of the present invention has the advantages of high grinding efficiency, long service life, high grinding accuracy, etc. The production method can produce special-shaped precision grinding tools with slender substrates, thin walls, and fine diamonds; by utilizing the characteristics of high electron beam energy density and fast heating and cooling speeds, the thermal damage to the diamond is reduced and the grinding tool substrate has almost no thermal deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

[0020] like Figure 1 As shown, the production method of electron beam fused diamond to make high-precision grinding tools disclosed in the present invention comprises the following steps:

[0021] Step 1, preparing a metal alloy powder slurry, specifically, mixing the alloy powder and glue in a mass ratio of 1:1-2, wherein the alloy powder is Cu-Co-Cr-Fe alloy powder, Ag-Cu-Sn-In-Ti alloy powder or Cu-Ni-Sn-Ti alloy powder, and the glue comprises the following components by mass percentage: 20-25% polyvinyl alcohol, 15-20% ammonium acryloyl, 5-8% sodium hydroxide, 3-5% ethanol, and the balance is water;

[0022] Step 2, spraying the prepared metal alloy powder slurry evenly on the surface of the steel substrate, after the spraying is completed, the thickness of the metal alloy powder slurry sprayed on the surface of the steel substrate after solidification is 130-150% of the average particle size of the diamond micropowder particles;

[0023] Step 3, spraying diamond micropowder particles uniformly onto the surface of the metal alloy powder slurry, wherein after spraying and adhering, the average gap between two adjacent diamond micropowder particles on the surface of the metal alloy powder slurry is 2 to 3 times the average particle size of the diamond micropowder particles, and the particle size range of the diamond micropowder particles is 500 to 10000 mesh;

[0024] Step 4, using an electron beam to heat the metal alloy powder slurry in a vacuum protective atmosphere until the alloy powder is melted, the fusion temperature is the melting point of the alloy powder + 60 to 100°C, and after cooling, the diamond micropowder particles and the alloy are fused and fixed on the surface of the steel substrate to form an abrasive tool.

[0025] In order to verify the performance of the abrasive tool produced by the production method of the present invention, the present invention provides the following four embodiments:

[0026] Embodiment 1:

[0027] The production method steps of using electron beam fused diamond to make precision grinding tools are as follows:

[0028] Step 1, mixing alloy powder and glue in a mass ratio of 1:2 to form a metal alloy powder slurry, wherein the alloy powder is Cu-Co-Cr-Fe alloy powder, and the glue comprises the following components by mass percentage: 25% polyvinyl alcohol, 20% ammonium acryloyl, 8% sodium hydroxide, 5% ethanol, and the balance is water;

[0029] Step 2, spraying the metal alloy powder slurry evenly on the surface of the steel substrate, wherein the thickness of the metal alloy powder slurry after solidification is 130-140% of the average particle size of the diamond micropowder particles, wherein the particle size of the diamond micropowder particles is 500 mesh;

[0030] Step 3, evenly spraying diamond micropowder particles onto the surface of the metal alloy powder slurry, wherein the average gap between two adjacent diamond micropowder particles is 2.5 to 3 times the average particle size of the diamond micropowder particles;

[0031] Step 4, using electron beam heating in a vacuum protective atmosphere to raise the temperature until the alloy powder is melted, the fusion temperature is the melting point of the alloy powder + 100°C, and after cooling, the diamond micropowder particles and the alloy are fused and fixed on the surface of the substrate to form an abrasive tool.

[0032] Embodiment 2:

[0033] The production method steps of using electron beam fused diamond to make precision grinding tools are as follows:

[0034] Step 1, mixing alloy powder and glue in a mass ratio of 1:1 to form a metal alloy powder slurry, wherein the alloy powder is Cu-Co-Cr-Fe alloy powder, and the glue comprises the following components by mass percentage: 23% polyvinyl alcohol, 18% ammonium acryloyl, 6% sodium hydroxide, 4% ethanol, and the balance is water;

[0035] Step 2, spraying the metal alloy powder slurry evenly on the surface of the steel substrate, wherein the thickness of the metal alloy powder slurry after solidification is 135-145% of the average particle size of the diamond micropowder particles, wherein the particle size of the diamond micropowder particles is 2000 mesh;

[0036] Step 3, spraying diamond micropowder particles uniformly onto the surface of the metal alloy powder slurry, wherein the average gap between two adjacent diamond micropowder particles is 2.3 to 2.8 times the average particle size of the diamond micropowder particles;

[0037] Step 4, using electron beam heating in a vacuum protective atmosphere to raise the temperature until the alloy powder is melted, the fusion temperature is the melting point of the alloy powder + 60°C, and after cooling, the diamond powder particles and the alloy are fused and fixed on the surface of the substrate to form an abrasive tool.

[0038] Embodiment 3:

[0039] The production method steps of using electron beam fused diamond to make precision grinding tools are as follows:

[0040] Step 1, mixing alloy powder and glue in a mass ratio of 1:1 to form a metal alloy powder slurry, wherein the alloy powder is Ag-Cu-Sn-In-Ti alloy powder, and the glue comprises the following components by mass percentage: 22% polyvinyl alcohol, 16% ammonium acryloyl, 5.5% sodium hydroxide, 3.5% ethanol, and the balance is water;

[0041] Step 2, spraying the metal alloy powder slurry evenly on the surface of the steel substrate, wherein the thickness of the metal alloy powder slurry after solidification is 140-150% of the average particle size of the diamond micropowder particles, wherein the particle size of the diamond micropowder particles is 5000 mesh;

[0042] Step 3, spraying diamond micropowder particles uniformly onto the surface of the metal alloy powder slurry, wherein the average gap between two adjacent diamond micropowder particles is 2-2.5 times the average particle size of the diamond micropowder particles;

[0043] Step 4, using electron beam heating in a vacuum protective atmosphere to raise the temperature until the alloy powder is melted, the fusion temperature is the melting point of the alloy powder + 60°C, and after cooling, the diamond powder particles and the alloy are fused and fixed on the surface of the substrate to form an abrasive tool.

[0044] Embodiment 4:

[0045] The production method steps of using electron beam fused diamond to make precision grinding tools are as follows:

[0046] Step 1, mixing alloy powder and glue in a mass ratio of 1:1 to form a metal alloy powder slurry, wherein the alloy powder is Cu-Ni-Sn-Ti alloy powder, and the glue comprises the following components by mass percentage: 20% polyvinyl alcohol, 15% ammonium acryloyl, 5% sodium hydroxide, 3% ethanol, and the balance is water;

[0047] Step 2, spraying the metal alloy powder slurry evenly on the surface of the steel substrate, wherein the thickness of the metal alloy powder slurry after solidification is 140-150% of the average particle size of the diamond micropowder particles, wherein the particle size of the diamond micropowder particles is 10000 mesh;

[0048] Step 3, spraying diamond micropowder particles uniformly onto the surface of the metal alloy powder slurry, wherein the average gap between two adjacent diamond micropowder particles is 2-2.5 times the average particle size of the diamond micropowder particles;

[0049] Step 4, using electron beam heating in a vacuum protective atmosphere to raise the temperature until the alloy powder is melted, the fusion temperature is the melting point of the alloy powder + 60°C, and after cooling, the diamond powder particles and the alloy are fused and fixed on the surface of the substrate to form an abrasive tool.

[0050] Among the above 4 embodiments, it can be seen through experimental comparison that embodiment 4 is the best embodiment and the disclosed parameters are the best parameter settings.

[0051] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and details may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A production method for producing high-precision grinding tools by electron beam fusion diamond, characterized in that: The steps include: Step 1, preparing a metal alloy powder slurry; Step 2, spraying the prepared metal alloy powder slurry evenly on the surface of the steel substrate; Step 3, spraying diamond micropowder particles evenly onto the surface of the metal alloy powder slurry; Step 4: In a vacuum protective atmosphere, the metal alloy powder slurry is heated by an electron beam until the alloy powder is melted. After cooling, the diamond powder particles are fused with the alloy and fixed on the surface of the steel substrate to form a grinding tool.

2. The production method of electron beam fused diamond to produce high-precision grinding tools according to claim 1, characterized in that: In step 1, when preparing the metal alloy powder slurry: the alloy powder and glue are evenly mixed in a mass ratio of 1:1 to 2.

3. The production method of electron beam fused diamond to produce high-precision grinding tools according to claim 2, characterized in that: The alloy powder is Cu-Co-Cr-Fe alloy powder, Ag-Cu-Sn-In-Ti alloy powder or Cu-Ni-Sn-Ti alloy powder.

4. The production method of electron beam fused diamond to produce high-precision grinding tools according to claim 2, characterized in that: The components of the glue in percentage by mass are: 20-25% of polyvinyl alcohol, 15-20% of ammonium acryloyl, 5-8% of sodium hydroxide, 3-5% of ethanol, and the balance is water.

5. The method for producing high-precision grinding tools by electron beam fused diamond according to claim 1, characterized in that: In step 2, after spraying is completed, the thickness of the metal alloy powder slurry sprayed on the surface of the steel substrate after solidification is 130-150% of the average particle size of the diamond micropowder particles.

6. The method for producing high-precision grinding tools by electron beam fused diamond according to claim 1, characterized in that: In step 3, after spraying and adhering, the average gap between two adjacent diamond micro-powder particles on the surface of the metal alloy powder slurry is 2 to 3 times the average particle size of the diamond micro-powder particles.

7. The production method of electron beam fused diamond to produce high-precision grinding tools according to claim 1, characterized in that: In step 3, the particle size range of the diamond micro powder particles is 500 to 10000 mesh.

8. The method for producing high-precision grinding tools by electron beam fused diamond according to claim 1, characterized in that: In step 4, when the metal alloy powder slurry is heated by an electron beam, the fusion temperature is the melting point of the alloy powder + 60 to 100°C.

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