Quartz glass abrasive cutting wheel and preparation method thereof

Abstract

The invention relates to the technical field of grinding wheel preparation, in particular to a quartz glass cutting grinding wheel and a preparation method thereof. The grinding wheel comprises a base body and a grinding material layer arranged on the outer circumferential end face of the base body, a through hole is formed in the middle of the base body, and the grinding material layer comprises, by weight, 10-20 parts of surface modified diamond; 1-3 parts of tin powder; 1-5 parts of nickel powder; 45 to 50 parts of iron powder; 1-7 parts of phosphorus copper alloy powder; 30 to 40 parts of copper powder; the surface modified diamond comprises the following powder raw materials by weight: 600-1000 g of cobalt powder; 300 to 500 g of diamond; and 300 to 500 g of liquid paraffin. The quartz glass abrasive cutting wheel and the preparation method thereof have the advantages that the product performance is effectively improved, the applicability is wide, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of grinding wheel preparation, and in particular to a quartz glass cutting grinding wheel and a preparation method thereof. Background Art

[0002] Quartz glass is a special industrial technology glass with a single component of silicon dioxide. The hardness of this glass can reach Mohs level 7, and the linear expansion coefficient is extremely small, which is 1 / 10 to 1 / 20 of ordinary glass. It has good thermal shock resistance and high heat resistance. Quartz glass is mainly used for laboratory equipment and special high-purity product refining equipment. Since quartz glass itself is very strong, the reaction force during the cutting process can easily cause the diamond on the grinding wheel to fall off. If the diamond falls off from the binder before the effective working life is completed, the tool will be consumed very quickly.

[0003] Diamond plating is to coat the diamond surface with a layer of affinity metal (Ti, Cr, W, Mo, etc.). These affinity metal coatings can form a strong chemical bond with diamond, and the metal coatings can form a brazing bond with the metal matrix. However, diamonds treated with Ti, Cr, W, and Mo still cannot reach the ideal state: that is, diamonds become ineffective after being fully utilized, so a new manufacturing process is needed to meet the requirements.

[0004] The results of dynamic tracking and observation of the behavior of diamond particles during the grinding wheel cutting process show that the ideal life cycle of a diamond during the grinding process should be: intact-blunt-micro-crushed-large-piece crushed-falling off. Only after completing this ideal life cycle can it fully exert its grinding effect. However, sometimes the processing object is too hard or the formula design is limited, so that the diamond falls off before it has completely experienced the above process, resulting in a large difference between the performance of the tool and the theoretical performance of the design. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a quartz glass cutting wheel and a manufacturing method thereof, which effectively solve the problems of short diamond life and low product quality.

[0006] The present invention first provides a quartz glass cutting grinding wheel, which comprises a substrate and an abrasive layer arranged on an outer circumferential end surface of the substrate, wherein a through hole is opened in the middle of the substrate, and the abrasive layer comprises the following raw materials in parts by weight: 10-20 parts of surface modified diamond; 1-3 parts of tin powder; 1-5 parts of nickel powder; 45-50 parts of iron powder; 1-7 parts of phosphor copper alloy powder; and 30-40 parts of copper powder; the surface modified diamond comprises the following powder raw materials in weight units: 600-1000g of cobalt powder; 300-500g of diamond; and 300-500g of liquid paraffin.

[0007] More optimally, the weight ratio of phosphorus to copper in the phosphor-copper alloy powder in the abrasive layer raw material is 2:8.

[0008] More optimally, in the raw materials of the abrasive layer, the particle size of the tin powder is 200#, the particle size of the nickel powder is 200#, the particle size of the iron powder is 325#, the particle size of the phosphorus copper alloy powder is 200#, and the particle size of the copper powder is 325#.

[0009] More optimally, in the surface modified diamond raw material, the cobalt powder has a particle size of 3 um, and the diamond has a particle size of 10 um to 20 um.

[0010] Another aspect of the present invention further provides a method for preparing a quartz glass cutting wheel, comprising the following steps:

[0011] S1: mixing cobalt powder and liquid paraffin, spraying and sintering the diamond to obtain surface-modified diamond;

[0012] S2: mixing, molding and curing the surface-modified diamond, tin powder, nickel powder, iron powder, phosphor-copper alloy powder and copper powder to obtain the quartz glass cutting wheel;

[0013] The quartz glass cutting wheel comprises a substrate and an abrasive layer arranged on an outer circumferential end surface of the substrate, a through hole is opened in the middle of the substrate, and the abrasive layer comprises the following raw materials in parts by weight: 10-20 parts of surface modified diamond; 1-3 parts of tin powder; 1-5 parts of nickel powder; 45-50 parts of iron powder; 1-7 parts of phosphor copper alloy powder; 30-40 parts of copper powder; the surface modified diamond contains the following powder raw materials in weight units: 600-1000g of cobalt powder; 300-500g of diamond; and 300-500g of liquid paraffin.

[0014] More optimally, in step S1, the cobalt powder and liquid paraffin are mixed and heated at 65-75°C and stirred for 0.5-1 hour; the spraying flow rate of the cobalt powder and liquid paraffin is 0.4-0.5 L / min.

[0015] More optimally, in step S1, the sintering is performed in a hydrogen atmosphere, and the sintering temperature is 650°C-700°C.

[0016] More optimally, in step S2, the mixing includes first mixing the tin powder, nickel powder, iron powder, phosphor-copper alloy powder, and copper powder to obtain a mixture, and then mixing the mixture with the surface-modified diamond for a second mixing.

[0017] More optimally, the first mixing time is 150-180 min, and the second mixing time is 50-60 min.

[0018] More optimally, the hydraulic press pressure during the molding is 5-15Mpa; the flow rate of hydrogen introduced during the curing is 2-3L / H, the curing temperature is 680-720°C, the curing pressure is 3-10Mpa, and the curing time is 50-60min.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] 1. The diamond holding force of the present invention is higher than other designs on the market, which will directly improve the processing efficiency and life of the grinding wheel when processing products, and has obvious economic benefits and energy-saving and emission-reduction effects.

[0021] 2. The diamond holding force of the present invention is higher than other designs on the market, which will allow more diamonds to remain on the grinding wheel during processing, which is conducive to dispersing the heat and processing resistance generated by the processing, effectively reducing the possibility of burns during processing, and at the same time reducing the possibility of surface scratches caused by falling diamonds, thereby improving processing quality and surface processing quality.

[0022] 3. The method of coating diamond with cobalt element used in the present invention reduces the manufacturing cost and expands the direction of formula design.

[0023] 4. When processing quartz glass, the traditional grinding wheel will have a high wear ratio and a fast change in the grinding wheel profile. This change will cause uneven texture on the processed surface of the quartz glass rod and may also cause low processing size accuracy. The method of enhancing the diamond holding force of the present invention increases the retention of the product, so that this design will not cause the grinding wheel to have a rapid decrease in life due to processing and grinding during operation, thereby affecting the processing size of the workpiece. This design therefore improves the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a metal grinding wheel prepared in Example 1 of the present invention;

[0025] Figure 2 is a cross-sectional view of a metal grinding wheel prepared in Example 1 of the present invention;

[0026] Figure 3 is a photograph of unmodified diamond in the present invention;

[0027] Figure 4 is a photo of the modified diamond in Example 1 of the present invention;

[0028] Figure 5 This is a photograph of the quartz glass to be processed in the present invention. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, the quartz glass cutting wheel comprises a substrate 1 and an abrasive layer 2 arranged on the outer circumferential end surface of the substrate, the abrasive layer 2 is evenly distributed on one end surface of the substrate 1, a through hole 3 is opened in the middle of the substrate 1, and the abrasive layer 2 comprises the following raw materials in weight percentage: 10-20 parts of surface modified diamond, 1-3 parts of tin powder, 1-5 parts of nickel powder, 45-50 parts of iron powder, 1-7 parts of phosphor copper alloy powder, and 30-40 parts of copper powder. The surface modified diamond is composed of the following weight units of powder raw materials: 600-1000g of cobalt powder, 300-500g of diamond, and 300-500g of liquid paraffin. The powder raw materials are made by a coating process, and then sintered and sieved by a specified process to obtain the surface modified diamond.

[0031] The diameter R of the quartz glass cutting wheel is 220 mm, the diameter Y of the through hole 3 is 32 mm, and the width D of the abrasive layer is 15 mm.

[0032] Embodiment 1:

[0033] 1. Making surface modified diamond:

[0034] The following weights were weighed: 800 g of cobalt powder (200% of diamond weight), with a particle size of 3 μm, 400 g of diamond, with a particle size of 15 μm, and 400 g of liquid paraffin. The cobalt powder and liquid paraffin were mixed in a heating container, heated at 70°C and stirred for 0.5 hours, and then the diamond was sprayed, with a spraying flow rate of 0.5 L / min for the cobalt powder and liquid paraffin mixture. During the spraying process, the container containing the diamond was rotated, with a diameter of 250 mm and a rotation speed of 55 rpm.

[0035] The coated diamond is sintered at 680°C in a hydrogen atmosphere to avoid oxidation of the diamond surface, and a sintered slightly bonded diamond is obtained. After being crushed, it is sieved through a 300# stainless steel mesh to obtain a surface-modified diamond.

[0036] 2. Abrasive layer formula: 1.5 parts of tin powder, particle size 200#, 3 parts of nickel powder, particle size 200#, 45 parts of iron powder, particle size 325#, 3 parts of phosphor-copper alloy powder (the weight ratio of phosphorus to copper is 2:8), particle size 200#, and 32.5 parts of copper powder, particle size 325# are added into a three-dimensional mixer according to weight and mixed evenly. The mixing time is 160 minutes and the speed of the three-dimensional mixer is 110rpm.

[0037] 3. Addition of surface modified diamond: Add 15 parts of surface modified diamond to the prepared abrasive layer formula and mix evenly using a three-dimensional mixer with a rotation speed of 55 rpm and a mixing time of 55 min.

[0038] 4. Blank forming: The mixed formula is formed by a hydraulic press at a pressure of 10 MPa to obtain a formed abrasive layer, and the formed abrasive layer is assembled with a substrate to obtain a formed grinding wheel.

[0039] 5. High temperature curing and sintering: The formed grinding wheel is placed in a hydraulic sintering furnace for high temperature curing and sintering. Hydrogen is introduced with a hydrogen flow rate of 2.5L / H to sinter the product. The sintering temperature is 700°C and the sintering pressure is 6Mpa. The finished grinding wheel is obtained after sintering for 55 minutes.

[0040] 6. Surface treatment, inspection and packaging: The grinding wheel will be fine-machined to size, and the product will be packaged and shipped after passing the inspection.

[0041] Embodiment 2:

[0042] 1. Making surface modified diamond:

[0043] The following weights were weighed: 600 g of cobalt powder (200% of diamond weight), with a particle size of 3 μm, 300 g of diamond, with a particle size of 10 μm, and 300 g of liquid paraffin. The cobalt powder and liquid paraffin were mixed in a heating container, heated at 65° C. and stirred for 0.5 hours, and then the diamond was sprayed, with a spraying flow rate of 0.4 L / min for the cobalt powder and liquid paraffin mixture. During the spraying process, the container containing the diamond was rotated, with a diameter of 200 mm and a rotation speed of 50 rpm.

[0044] The coated diamond is sintered at 650°C in a hydrogen atmosphere to avoid oxidation of the diamond surface, and a sintered slightly bonded diamond is obtained. After being crushed, it is sieved through a 300# stainless steel mesh to obtain a surface-modified diamond.

[0045] 2. Abrasive layer formula: Add 1 part of tin powder, particle size is -200#, 1 part of nickel powder, particle size is -200#, 45 parts of iron powder, particle size is 325#, 1 part of phosphor-copper alloy powder (the weight ratio of phosphorus and copper is 2:8), particle size is -200#, and 30 parts of copper powder, particle size is 325# into a three-dimensional mixer according to weight and mix evenly. The mixing time is 150 minutes and the speed of the three-dimensional mixer is 100rpm.

[0046] 3. Addition of surface modified diamond: Add 10 parts of surface modified diamond to the prepared abrasive layer formula and mix evenly, using a three-dimensional mixer with a rotation speed of 50 rpm and a mixing time of 50 min.

[0047] 4. Blank forming: The mixed formula is formed by a hydraulic press at a pressure of 5 MPa to obtain a formed abrasive layer, and the formed abrasive layer is assembled with a substrate to obtain a formed grinding wheel.

[0048] 5. High temperature curing and sintering: Place the formed grinding wheel into a hydraulic sintering furnace for high temperature curing and sintering. Pass hydrogen at a hydrogen flow rate of 2L / H to sinter the product. The sintering temperature is 680°C and the sintering pressure is 3Mpa. After sintering for 50 minutes, the finished grinding wheel is obtained.

[0049] 6. Surface treatment, inspection and packaging: The grinding wheel will be fine-machined to size, and the product will be packaged and shipped after passing the inspection.

[0050] Embodiment 3:

[0051] 1. Preparation of surface modified diamond: Weigh the following: 1000g cobalt powder (200% diamond weight), particle size 3um, 500g diamond, particle size 20um, 500g liquid paraffin. Mix the cobalt powder and liquid paraffin in a heating container, heat at 75°C and stir for 1 hour, then spray the diamond, the spray flow rate of the cobalt powder and liquid paraffin mixture is 0.5L / min, during the spraying process, the container containing the diamond is rotated, the container diameter is 300mm, and the rotation speed is 60rpm.

[0052] The coated diamond is sintered at 700°C in a hydrogen atmosphere to avoid oxidation of the diamond surface, and a sintered slightly bonded diamond is obtained. After being crushed, it is sieved through a 300# stainless steel mesh to obtain a surface-modified diamond.

[0053] 2. Abrasive layer formula: Add 3 parts of tin powder, particle size 200#, 5 parts of nickel powder, particle size -200#, 50 parts of iron powder, particle size 325#, 7 parts of phosphor-copper alloy powder (the weight ratio of phosphorus and copper is 2:8), particle size 200#, and 40 parts of copper powder, particle size 325# into a three-dimensional mixer according to weight and mix evenly. The mixing time is 180 minutes and the speed of the three-dimensional mixer is 120rpm.

[0054] 3. Addition of surface modified diamond: Add 20 parts of surface modified diamond to the prepared abrasive layer formula and mix evenly, using a three-dimensional mixer, the rotation speed of the three-dimensional mixer is 60 rpm, and the mixing time is 60 minutes.

[0055] 4. Blank forming: The mixed formula is formed by a hydraulic press at a pressure of 15 MPa to obtain a formed abrasive layer, and the formed abrasive layer is assembled with a substrate to obtain a formed grinding wheel.

[0056] 5. High temperature curing and sintering: Place the formed grinding wheel into a hydraulic sintering furnace for high temperature curing and sintering. Pass hydrogen at a hydrogen flow rate of 3L / H to sinter the product. The sintering temperature is 720°C and the sintering pressure is 10Mpa. After sintering for 60 minutes, the finished grinding wheel is obtained.

[0057] 6. Surface treatment, inspection and packaging: The grinding wheel will be fine-machined to size, and the product will be packaged and shipped after passing the inspection.

[0058] Comparative Example 1:

[0059] The abrasive layer ratio is the same as that of Example 1, and the mixing method is the same as that of Example 1, but ordinary titanium-coated diamond is used instead of the cobalt metal-coated modified diamond of the present invention.

[0060] Comparative Example 2:

[0061] The abrasive layer ratio is the same as that of Example 1, and the mixing method is the same as that of Example 1, but ordinary normal diamond is used instead of the cobalt metal-coated modified diamond of the present invention.

[0062] Comparative Example 3:

[0063] The abrasive layer ratio is the same as that of Example 1, and the mixing method is the same as that of Example 1, but iron powder is used instead of the cobalt powder of the present invention to coat the modified diamond.

[0064] evaluate:

[0065] Testing method for scratch rate: visually inspect the scratches on the quartz surface. The scratch rate is the number of pieces with scratches on the surface after grinding / the total number of processed pieces.

[0066] Shedding rate test: observe the shedding of the diamond abrasive layer on the grinding wheel. The shedding rate is the number of shedding pieces / total number of pieces.

[0067] The effects of each embodiment and comparative example are shown in the following table.

[0068] Table 1 Comparison of the use effects of various embodiments and comparative examples

[0069]

[0070] Conclusion: The scratch rate and shedding rate of Example 2 are the smallest, while the scratch rate and shedding rate of Comparative Examples 1, 2, and 3 are all relatively large. The use of diamond modified by cobalt metal surface coating to make an abrasive layer is beneficial to improving the processing efficiency and service life of the grinding wheel and the surface quality of the workpiece, and reducing the occurrence of scratches. After experiments, the diamond shedding pit (shedding rate) is less than 12%, which can increase the life of the grinding wheel by 30%, which is better than the current 20% diamond shedding rate.

[0071] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0072] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A quartz glass cutting wheel, characterized in that: The grinding wheel comprises a base body and an abrasive layer arranged on an outer circumferential end surface of the base body, a through hole is opened in the middle of the base body, and the abrasive layer comprises the following raw materials in parts by weight: Surface modified diamond 10-20 parts; 1-3 parts of tin powder; Nickel powder 1-5 parts; 45-50 parts of iron powder; 1-7 parts of phosphor copper alloy powder; 30-40 parts of copper powder; The surface modified diamond comprises the following powder raw materials in weight units: Cobalt powder 600-1000g; Diamond 300-500g; 300-500g liquid paraffin.

2. A quartz glass cutting wheel according to claim 1, characterized in that: The weight ratio of phosphorus to copper in the phosphor-copper alloy powder in the abrasive layer raw material is 2:

8.

3. A quartz glass cutting wheel according to claim 1, characterized in that: In the raw materials of the abrasive layer, the particle size of the tin powder is 200#, the particle size of the nickel powder is 200#, the particle size of the iron powder is 325#, the particle size of the phosphorus copper alloy powder is 200#, and the particle size of the copper powder is 325#.

4. A quartz glass cutting wheel according to claim 1, characterized in that: In the surface-modified diamond raw material, the cobalt powder has a particle size of 3 um, and the diamond has a particle size of 10 um to 20 um.

5. A method for preparing a quartz glass cutting wheel, characterized in that: The following steps are involved: S1: mixing cobalt powder and liquid paraffin, spraying and sintering the diamond to obtain surface-modified diamond; S2: mixing, molding and curing the surface-modified diamond, tin powder, nickel powder, iron powder, phosphor-copper alloy powder and copper powder to obtain the quartz glass cutting wheel; The quartz glass cutting wheel comprises a base and an abrasive layer arranged on an outer circumferential end surface of the base, a through hole is opened in the middle of the base, and the abrasive layer comprises the following raw materials in parts by weight: Surface modified diamond 10-20 parts; 1-3 parts of tin powder; Nickel powder 1-5 parts; 45-50 parts of iron powder; 1-7 parts of phosphor copper alloy powder; 30-40 parts of copper powder; The surface modified diamond package includes the following powder raw materials in weight units: Cobalt powder 600-1000g; Diamond 300-500g; 300-500g liquid paraffin.

6. The method for preparing a quartz glass cutting wheel according to claim 5, characterized in that: In step S1, the cobalt powder and liquid paraffin are mixed and heated at 65-75° C. and stirred for 0.5-1 hour; the spraying flow rate of the cobalt powder and liquid paraffin is 0.4-0.5 L / min.

7. The preparation method according to claim 5, characterized in that: In step S1, the sintering is performed in a hydrogen atmosphere at a temperature of 650°C-700°C.

8. The preparation method according to claim 5, characterized in that: In step S2, the mixing includes firstly mixing the tin powder, nickel powder, iron powder, phosphor copper alloy powder and copper powder to obtain a mixture, and then mixing the mixture with the surface modified diamond to perform a second mixing.

9. The preparation method according to claim 8, characterized in that: The first mixing time is 150-180 min, and the second mixing time is 50-60 min.

10. The preparation method according to claim 5, characterized in that: The hydraulic press pressure during the molding process is 5-15Mpa; the flow rate of hydrogen introduced during the curing process is 2-3L / H, the curing temperature is 680-720°C, the curing pressure is 3-10Mpa, and the curing time is 50-60min.

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