CN-122008093-A - Diamond grinding wheel of thermosetting resin binder and preparation method thereof

Abstract

The invention discloses a diamond grinding wheel of a thermosetting resin binder and a preparation method thereof, wherein diamond particles, thermosetting resin powder, a binder and copper powder are mixed to prepare a mixture, the mixture is banburying, granulating and wiredrawing to obtain a grinding wheel working layer wire, then the grinding wheel working layer wire is subjected to 3D printing to obtain a grinding wheel working layer green body, and the grinding wheel working layer green body is subjected to degreasing and hot-pressing sintering to obtain a diamond grinding wheel working layer. The fused deposition 3D printing preparation method can realize the production line of the thermosetting resin bond diamond grinding wheel and improve the production efficiency.

Inventors

• ZHANG SHAOHE
• CHENG BAODONG
• ZHANG XINGHUA
• GAO JIANMING
• ZHANG HAOYANG
• ZHANG XIONG
• ZHU WENBIN
• LIU JUNXIANG

Assignees

• 中南大学
• 浙江西斯特科技有限公司

Dates

Publication Date

20260512

Application Date

20260312

Claims (10)

1. 1. A preparation method of a diamond grinding wheel with a thermosetting resin binder is characterized in that diamond particles, thermosetting resin powder, a binder and copper powder are mixed to prepare a mixture, the mixture is banburying, granulating and wire drawing to obtain a grinding wheel working layer wire, then the grinding wheel working layer wire is subjected to 3D printing to obtain a grinding wheel working layer green body, and the grinding wheel working layer green body is subjected to degreasing, hot-pressing and sintering to obtain the diamond grinding wheel working layer.
2. 2. The method for preparing a diamond grinding wheel with thermosetting resin binder according to claim 1, wherein: In the mixture, the mass ratio of the total mass of the diamond particles, the thermosetting resin powder and the copper powder to the binder is 1:2-5; in the mixture, the volume ratio of the total volume of the thermosetting resin powder to the copper powder to the volume of the diamond particles is 3-6:1.
3. 3. The method for preparing a diamond grinding wheel with a thermosetting resin binder according to claim 1, wherein the surface of the diamond particles comprises a plating layer, the plating layer is made of at least one material selected from Ni, W, ti, mo, si, B, and the plating layer has a thorn-shaped structure; The diamond particles are obtained by coarsening pure diamond, sensitizing, activating, placing activated pure diamond in chemical plating solution, and reacting for 30-120 min; the electroless plating solution comprises 1-9 mg/L of chalcogenide; coarsening the surface of the pure diamond by adopting hydrofluoric acid or nitric acid solution; The sensitization treatment comprises immersing coarsened pure diamond into a mixed solution containing 0.1-0.5 g/L SnCl 2 and 10-20 mL/L HCl, stirring at room temperature for 5-10min, and then washing with deionized water; The activation treatment is carried out by immersing sensitized pure diamond into mixed solution containing 0.1-0.5 g/L PdCl 2 and 10-20 mL/L HCl, stirring at room temperature for 5-10min, and washing with deionized water.
4. 4. The method for preparing a diamond grinding wheel with a thermosetting resin binder according to claim 1, wherein the diamond particles have a particle size of 0.5-100 μm, the thermosetting resin powder has a particle size of 1-120 μm, and the copper powder has a particle size of 2-80 μm; The thermosetting resin powder consists of resin powder and a curing agent, wherein the mass fraction of the curing agent in the thermosetting resin powder is 1-10%, and the resin powder is selected from one of phenolic resin powder and epoxy resin powder; When the resin powder is selected from phenolic resin powder, the curing agent is urotropine; when the resin powder is selected from epoxy resin powder, the curing agent is polyamide.
5. 5. The method for preparing a diamond grinding wheel with a thermosetting resin binder according to any one of claims 1 to 4, wherein the binder comprises, by mass, 35-52% of polycaprolactone, 20-36% of ethylene-vinyl acetate copolymer, 5-16% of dipentyl phthalate and 3-8% of stearic acid.
6. 6. A method of producing a diamond wheel with a thermosetting resin bond as claimed in any one of claims 1 to 4, wherein: The banburying temperature is 70-90 ℃, and the banburying time is 60-90 min; sieving the granulated granules with an 8-mesh sieve, taking undersize products, and drawing the undersize products; The temperature of the wire drawing is 95-105 ℃; The diameter of the grinding wheel working layer wire is 1.65-1.85 mm.
7. 7. A method of producing a diamond wheel with a thermosetting resin bond as claimed in any one of claims 1 to 4, wherein: In the 3D printing process, controlling the diameter of a nozzle to be 0.4-2 mm, the layer height to be 0.05-2 mm, the extrusion rate to be 30-120 mm/s and the extrusion flow to be 100-150%; in the 3D printing process, controlling the temperature of a nozzle to be 60-80 ℃ and the temperature of a platform to be 50-90 ℃; And the 3D printing adopts a melt extrusion molding printer.
8. 8. The method for preparing the diamond grinding wheel with the thermosetting resin binder according to any one of claims 1 to 4, wherein degreasing is performed under a hydrogen atmosphere, the degreasing process comprises the steps of heating to 30-60 ℃ from room temperature at a heating rate of 3-5 ℃ per minute, preserving heat for 15-30 min, heating to 70-90 ℃ at a heating rate of 4-10 ℃ per minute, preserving heat for 15-120 min, heating to 100-110 ℃ at a heating rate of 2-5 ℃ per minute, preserving heat for 20-60 min, and cooling in a furnace.
9. 9. The method for preparing the diamond grinding wheel with the thermosetting resin binder, which is characterized by comprising the steps of heating to 90-100 ℃ at a heating rate of 10-25 ℃ per minute, preserving heat for 10-45 min, heating to 170-190 ℃ at a heating rate of 5-20 ℃ per minute, preserving heat for 10-30 min, and then cooling along with a furnace.
10. 10. A diamond wheel of thermosetting resin bond prepared by the method of any one of claims 1 to 9.

Description

Diamond grinding wheel of thermosetting resin binder and preparation method thereof Technical Field The invention belongs to the technical field of grinding tool material preparation, and particularly relates to a diamond grinding wheel of a thermosetting resin binder and a preparation method thereof. Background In the modern precision manufacturing industry, with the rapid development of material science, engineering materials with high hardness, high brittleness and special physical and chemical properties, such as hard alloy, engineering ceramics, optical glass, semiconductor wafers, magnetic materials and composite materials, are increasingly widely applied. For the molding and surface treatment of these difficult-to-process materials, conventional aluminum oxide (corundum) and silicon carbide abrasive tools have difficulty meeting the requirements of efficient and high-precision processing. Diamond is known in nature as the highest hardness substance, and exhibits an extremely high grinding ratio when processing a high hardness, low toughness material due to its extremely high wear resistance, excellent thermal conductivity, and chemical stability. However, diamond abrasive itself cannot be used directly as a tool, and it must be consolidated by a bonding agent into a tool having a certain geometry and strength, i.e., a diamond grinding wheel. Among the three major classes of bonding agents, metal, ceramic and resin, the resin-bonded diamond grinding wheel occupies an irreplaceable core position in the precision grinding field due to its unique viscoelasticity, self-sharpening and surface dressing capabilities. However, the traditional resin bond diamond grinding wheel has lower heat resistance, a large amount of heat can be generated due to high-speed rotation during grinding, and the local temperature of a grinding area is too high, so that the diamond grinding wheel is in thermal decomposition failure, and the diamond grinding wheel cannot quickly dissipate heat from inside to outside when being matched with cooling liquid. Disclosure of Invention In view of the shortcomings of the prior art, a first object of the present invention is to provide a method for preparing a diamond grinding wheel with a thermosetting resin binder. According to the preparation method, the special adhesive is used for tightly combining the diamond particles, the thermosetting resin powder and the copper powder, the filiform materials are obtained after mixing, granulating and wiredrawing, and then the filiform materials are placed in a 3D printer to obtain the green compact. A second object of the present invention is to provide a diamond wheel of a thermosetting resin bond prepared by the above preparation method. The thermosetting resin bond diamond grinding wheel uses the thermosetting resin bond to fix the abrasive, the grinding wheel has more excellent self-sharpening property, copper powder is added into the grinding wheel, a high-efficiency heat conduction percolation network of abrasive particles-plating layers-copper powder is constructed, the technical problems that the traditional resin bond has poor heat conduction and is easy to cause carbonization failure due to grinding heat accumulation are effectively solved, the service life and the processing quality of the grinding tool are obviously improved, the waste of diamond raw materials can be greatly reduced by matching with a fused deposition 3D printing technology, the autonomous planning of paths is realized, and the structural complexity is improved. In order to solve the technical problems, the technical scheme of the invention is as follows: The invention provides a preparation method of a diamond grinding wheel of a thermosetting resin binder, which comprises the steps of mixing diamond particles, thermosetting resin powder, a binder and copper powder to prepare a mixture, banburying, granulating and wiredrawing the mixture to obtain a grinding wheel working layer wire, performing 3D printing on the grinding wheel working layer wire to obtain a grinding wheel working layer green body, degreasing and hot-pressing and sintering the grinding wheel working layer green body to obtain a diamond grinding wheel working layer. According to the preparation method of the thermosetting resin bond diamond grinding wheel, provided by the invention, the working layer is decoupled in time and space through phase change flow of the thermoplastic carrier and cross-linking reaction of thermosetting resin, and the isostatic pressing support technology of the particle medium is combined, so that the near net forming of the thermosetting composite material without a mould is realized, the problems of dependence of a traditional hot pressing process on the mould and easiness in collapse of slurry printing are overcome, a heat conduction passage is constructed by using metal fillers in microcosmic, an active heat dissipation runner is constructed macroscopically, the temperatu