CN112676568A - Preparation method of parallel surface CVD diamond roller - Google Patents
Preparation method of parallel surface CVD diamond roller Download PDFInfo
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- CN112676568A CN112676568A CN202011415439.2A CN202011415439A CN112676568A CN 112676568 A CN112676568 A CN 112676568A CN 202011415439 A CN202011415439 A CN 202011415439A CN 112676568 A CN112676568 A CN 112676568A
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- 239000002184 metal Substances 0.000 claims abstract description 69
- 229910052751 metal Inorganic materials 0.000 claims abstract description 69
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- 230000007704 transition Effects 0.000 claims abstract description 24
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- 238000002156 mixing Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
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- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 36
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 24
- KEMQGTRYUADPNZ-UHFFFAOYSA-N heptadecanoic acid Chemical compound CCCCCCCCCCCCCCCCC(O)=O KEMQGTRYUADPNZ-UHFFFAOYSA-N 0.000 claims description 24
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- DTCCVIYSGXONHU-CJHDCQNGSA-N (z)-2-(2-phenylethenyl)but-2-enedioic acid Chemical compound OC(=O)\C=C(C(O)=O)\C=CC1=CC=CC=C1 DTCCVIYSGXONHU-CJHDCQNGSA-N 0.000 claims description 12
- 239000011668 ascorbic acid Substances 0.000 claims description 12
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- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 11
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- WXUAQHNMJWJLTG-UHFFFAOYSA-N 2-methylbutanedioic acid Chemical compound OC(=O)C(C)CC(O)=O WXUAQHNMJWJLTG-UHFFFAOYSA-N 0.000 claims description 8
- 229910021594 Copper(II) fluoride Inorganic materials 0.000 claims description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 8
- GWFAVIIMQDUCRA-UHFFFAOYSA-L copper(ii) fluoride Chemical compound [F-].[F-].[Cu+2] GWFAVIIMQDUCRA-UHFFFAOYSA-L 0.000 claims description 8
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
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- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 4
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical group [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 4
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 6
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- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The invention discloses a preparation method of a parallel surface CVD diamond roller, which comprises the following steps: preparing a rigid matrix; sticking a synthetic diamond CVD strip on the inner cavity wall of the graphite mould; placing the steel matrix into a graphite mould, and coating a brazing flux; respectively weighing W80, Cu20 and transition layer metal powder, uniformly mixing, paving the mixed metal powder between a graphite die and a rigid matrix, and compacting by using a press; placing the graphite mold into a vacuum brazing furnace, performing sintering and brazing treatment, finally taking out a sintered body, removing the mold, naturally cooling, and performing finish machining to obtain a finished diamond roller; packaging the finished diamond roller; the process structure of the invention is reasonable in design, the prepared diamond roller can simultaneously carry out double-side dressing on the grinding wheel, and the diamond roller has the advantages of large hardness, small error and the like, and is suitable for mass popularization.
Description
Technical Field
The invention relates to the technical field of grinding equipment, in particular to a preparation method of a parallel surface CVD diamond roller.
Background
The diamond roller is a new generation of grinding wheel dressing tool and has the characteristics of high precision and high forming. The numerical control forming grinding technology is a novel processing technology which is rapidly developed at home and abroad in recent years, and the efficient and precise processing mode of the numerical control forming grinding technology is widely applied to mechanical engineering. The working principle of the diamond roller is as follows: the diamond roller wheel is arranged on a trimming device of a grinding machine, a common ceramic grinding wheel or a CBN grinding wheel is trimmed by the diamond roller wheel, and a part is ground after the grinding wheel is formed, so that the contour, the precision and the size of the diamond roller wheel are copied to the surface of the processed part through the grinding wheel. The grinding machine has the characteristics that the machine tool is simple to operate, the technical requirement on operators is not high, the processed products are good in precision consistency and stable in quality, the production efficiency and the product quality can be obviously improved, the manufacturing cost is reduced, and the grinding machining automation is easy to realize.
The current factory development is developed towards pursuing productivity and quality, high precision and labor saving, the technical threshold of operators is reduced, the direction of middle complicated operation is eliminated, the existing process single-point diamond dresser cannot be used for dressing bilateral symmetrical arc-shaped grinding wheels, the dressing angle needs to be adjusted repeatedly because the dressing consistency is poor, and because only one diamond is used, the diamond is worn quickly and has poor consistency, the high precision of special requirements cannot be met, the diamond is frequently replaced, the labor and the trouble are wasted, and the defective rate is high; meanwhile, in the diamond roller for double-sided dressing in the prior art, the diamond strips and the matrix are fixed into a whole through sintering, and the arrangement of the diamond strips is random, so that the precision of two surfaces of the grinding wheel to be dressed in the dressing process of the bilateral symmetrical arc-shaped grinding wheel is asymmetrical, and the machining precision of a workpiece is influenced.
Disclosure of Invention
Aiming at the technical problems, the invention provides a preparation method of a parallel surface CVD diamond roller capable of accurately finishing two surfaces of a grinding wheel simultaneously.
The technical scheme of the invention is as follows: a preparation method of a parallel surface CVD diamond roller comprises the following steps:
s1, preparing a rigid matrix according to the use working condition;
s2, uniformly coating adhesive on the inner cavity wall of the graphite mold, and manually arranging artificial diamond CVD strips with the thickness of 0.8 multiplied by 1.8mm, wherein the included angle between the artificial diamond CVD strips and the inner cavity wall of the graphite mold is 15-90 degrees and is arranged in a diamond shape;
s3, placing the rigid matrix obtained in the step S1 in the center of a graphite mold, and uniformly coating a brazing flux on the surface of the rigid matrix and the diamond CVD strip layer;
s4, respectively weighing W80, Cu20 and transition layer metal powder, and uniformly mixing the W80 metal powder and the Cu20 metal powder, wherein the volume ratio of the W80 to the Cu20 metal powder is 1:1, and the volume ratio of the transition layer metal powder is 2-9% of that of the W80 and Cu20 mixed metal powder; the total volume of W80, Cu20 and the transition layer metal powder is obtained by volume formula pi (r12-r22) x h, wherein r1 is the radius of the graphite mold, r2 is the radius of the rigid substrate, and h is the height of the rigid substrate;
s5, paving 40-70% of the total volume of the mixed metal powder obtained in the step S4 into a gap between a graphite mold and a steel substrate, compacting by a press machine at the pressure of 100-200mpa, paving transition layer metal powder, covering the residual mixed metal powder, and compacting the mixed metal powder again by the press machine at the pressure of 100-200 mpa;
s6, placing the graphite mold obtained in the step S5 into a vacuum brazing furnace, and vacuumizing to 0.2 multiplied by 10-5-1.2×10- 5Pa, slowly raising the temperature to 780-890 ℃ within 5-10min, preserving the heat for 0.5-1.2h, finally taking out the sintered body and removing the mold, naturally cooling to room temperature, and performing finish machining by taking the diamond as the reference according to the processing precision requirement of a drawing to obtain a finished diamond roller;
and S7, performing dynamic balance on the finished diamond roller obtained in the step S6, cleaning, coating antirust oil, and then packaging.
Further, in step S2, the adhesive is a phenolic resin adhesive, and the synthetic diamond CVD bar is bonded to the graphite mold cavity arm by the phenolic resin adhesive, so that not only can the arrangement stability of the synthetic diamond CVD and the metal powder in the brazing process be improved, but also the smooth demolding of the sintered body is facilitated.
Further, in step S2, the artificial diamond CVD bar is formed by mixing modified graphite powder, catalyst alloy powder and solvent components according to a volume ratio of 2:1:1, wherein the catalyst alloy powder is a mixture of iron powder, silicon powder and cobalt powder according to a volume ratio of 4:2:1, and the solvent components comprise, by weight, 15-25 parts of epoxy resin, 5-17 parts of n-butyl alcohol, 2-16 parts of hardened castor oil, 1-9 parts of methylsuccinic acid and 10-20 parts of fatty acid amide; the preparation method of the artificial diamond CVD strip comprises the following steps: the modified graphite powder, the catalyst alloy powder and the solvent are uniformly mixed according to the proportion, then the mixture is continuously pressed for 0.5-2min under the conditions that the temperature is 960-1200 ℃ and the pressure is 450-706MPa, the covering and pressing treatment is carried out for 1-5min, and the artificial diamond CVD strip is obtained after cooling.
Further, in step S3, the solder comprises, by weight, 15-30 parts of styrene-maleic acid resin, 7-16 parts of heptadecanoic acid, 15-35 parts of propylene glycol, 5-10 parts of nano silver particles, 4-9 parts of copper difluoride powder and 12-19 parts of ascorbic acid, and the preparation method of the solder comprises: respectively placing styrene-maleic acid resin, heptadecanoic acid, propylene glycol and ascorbic acid into a dispersing container, heating and stirring to completely dissolve the styrene-maleic acid resin, the heptadecanoic acid, the propylene glycol and the ascorbic acid, respectively adding the nano silver particles and the copper difluoride powder into the mixed solution, and continuously stirring to form a paste. The brazing flux prepared by the method has good high-temperature fluidity and wettability, greatly improves the spreading area and depth of the brazing flux on a welding seam between an artificial diamond CVD strip and a metal powder sintered body, and further improves the firmness degree of the welding seam.
Further, in step S6, in the fine machining process of the diamond roller, the grinding method is used to repeat 3-5 times to reduce the circular runout error of the surface of the diamond roller after being finished to less than 20 μm, and the diamond roller is ground and fine machined, so that the swinging generated in the use process of the diamond roller is greatly reduced, the use safety is improved, and the diamond roller of the present invention can be suitable for the finishing equipment with higher rotating speed.
Further, in step S4, the transition layer metal powder is a copper-nickel alloy powder, and the transition layer metal powder layer is added, so that the metal particles of the W80 and Cu20 metal powders are more uniformly arranged in the sintering and brazing process, thereby avoiding the generation of holes in the metal powder brazing process and reducing the defects of the metal powders in the sintering and brazing process.
Further, after the step S6 is completed, the finished diamond roller is subjected to a high-frequency quenching treatment, specifically: and placing the finished diamond roller into a high-frequency current inductor, quickly heating to 650-950 ℃ within 15-25s, and then quickly cooling to room temperature within 8-12s, so that the hardness of the finished diamond roller is greatly improved and the service life of the finished diamond roller is prolonged by carrying out high-frequency quenching treatment on the finished diamond roller.
Compared with the prior art, the invention has the beneficial effects that: compared with the traditional single-point diamond pen finishing, the diamond roller has the advantages that the production efficiency is greatly improved, the surface quality and the precision of the machined part are higher, and the diamond roller is particularly suitable for high-precision and large-batch production; the diamond roller can finish the shaping and dressing of the grinding wheel in a short time, and has small dressing force, small abrasion of the dressing tool and high dressing precision during dressing; the diamond roller grinding wheel dresser has the advantages of high dressing efficiency, long service life, convenience in cooling, simple structure, small volume and convenience in installation, the artificial diamond CVD strips and the wall of the inner cavity of the graphite mold are arranged and adhered in a diamond shape at an angle of 45 degrees, so that the hardness of the finished diamond roller can be greatly improved, the abrasion loss of the high-finished diamond roller can be reduced, meanwhile, the artificial diamond CVD strips have good crystal form, have the advantages of high integrity and uniform granularity, and further the finished diamond roller has good hardness and impact strength, and the abrasion loss of the finished diamond roller can be reduced; the brazing flux greatly improves the spreading area and the spreading depth of the brazing flux on a welding seam between an artificial diamond CVD strip and a metal powder sintered body, improves the impact resistance of a finished diamond roller, improves the circular runout error of the surface of the diamond roller by grinding and finishing the finished diamond roller, and improves the hardness of the finished diamond roller by performing high-frequency quenching treatment on the finished diamond roller so as to reduce the abrasion loss.
Detailed Description
Example 1: a preparation method of a parallel surface CVD diamond roller comprises the following steps:
s1, preparing a rigid matrix according to the use working condition;
s2, uniformly coating adhesive on the inner cavity wall of the graphite mold, and manually arranging artificial diamond CVD strips with the thickness of 0.8 multiplied by 1.8mm, wherein the included angle between the artificial diamond CVD strips and the inner cavity wall of the graphite mold is 15 degrees and is arranged in a diamond shape; the adhesive is phenolic resin adhesive, and the artificial diamond CVD strips are bonded with the graphite die cavity arms through the phenolic resin adhesive, so that the arrangement stability of the artificial diamond CVD strips and the metal powder in the brazing process can be improved, and the smooth demolding of a sintered body is facilitated; the artificial diamond CVD strip is a commercial product;
s3, placing the rigid matrix obtained in the step S1 in the center of a graphite mold, and uniformly coating a brazing flux on the surface of the rigid matrix and the diamond CVD strip layer, wherein the brazing flux is a commercially available product;
s4, respectively weighing W80, Cu20 and transition layer metal powder, and uniformly mixing the W80 metal powder and the Cu20 metal powder, wherein the volume ratio of the W80 to the Cu20 metal powder is 1:1, and the volume ratio of the transition layer metal powder is 2% of that of the W80 and the Cu20 mixed metal powder; the total volume of W80, Cu20 and transition layer metal powder is represented by volume formula pi (r 1)2-r22) X h can be obtained, wherein r1 is the radius of the graphite mold, r2 is the radius of the rigid matrix, and h is the height of the rigid matrix; the transition layer metal powder is copper-nickel alloy powder, and by adding the transition layer metal powder layer, metal particles of W80 and Cu20 metal powder are more uniformly arranged in the sintering brazing process, so that holes are prevented from being generated in the metal powder brazing process, and the defects of the metal powder in the sintering brazing process are reduced;
s5, paving 40% of the total volume of the mixed metal powder obtained in the step S4 into a gap between a graphite die and a steel substrate, compacting under the pressure of 100mpa by using a small 20t press, paving transition layer metal powder, covering the residual mixed metal powder, and compacting the mixed metal powder again under the pressure of 150mpa by using the press;
S6、putting the graphite mould obtained in the step S5 into a vacuum brazing furnace, and vacuumizing to 0.2 multiplied by 10-5Pa, slowly heating to 780-DEG C within 5min, preserving heat for 0.5h, finally taking out the sintered body, removing the die, naturally cooling to room temperature, and performing finish machining by taking the diamond as a reference according to the machining precision requirement of a drawing to obtain a finished diamond roller;
and S7, performing dynamic balance on the finished diamond roller obtained in the step S6, cleaning, coating antirust oil, and then packaging.
Example 2: this embodiment is substantially the same as the embodiment except that: in step S2, the synthetic diamond CVD strips and the wall of the inner cavity of the graphite mold form an included angle of 45 degrees and are arranged in a diamond shape.
Example 3: this embodiment is substantially the same as embodiment 2 except that:
in step S2, the artificial diamond CVD strip is formed by mixing modified graphite powder, catalyst alloy powder and solvent components according to a volume ratio of 2:1:1, wherein the catalyst alloy powder is a mixture of iron powder, silicon powder and cobalt powder according to a volume ratio of 4:2:1, and the solvent components comprise, by weight, 15 parts of epoxy resin, 5 parts of n-butyl alcohol, 2 parts of hardened castor oil, 1 part of methylsuccinic acid and 10 parts of fatty acid amide; the preparation method of the artificial diamond CVD strip comprises the following steps: the modified graphite powder, the catalyst alloy powder and the solvent are uniformly mixed according to the proportion, then the mixture is continuously pressed for 0.5min under the conditions that the temperature is 960 ℃ and the pressure is 450MPa, the covering and pressing treatment is carried out for 1min, and the artificial diamond CVD strip is obtained after cooling.
Example 4: this embodiment is substantially the same as embodiment 2 except that:
in step S3, the brazing flux includes, by weight, 15 parts of styrene-maleic acid resin, 7 parts of heptadecanoic acid, 15 parts of propylene glycol, 5 parts of nano silver particles, 4 parts of copper difluoride powder, and 12 parts of ascorbic acid, and the preparation method of the brazing flux includes: respectively placing styrene-maleic acid resin, heptadecanoic acid, propylene glycol and ascorbic acid into a dispersing container, heating and stirring to completely dissolve the styrene-maleic acid resin, the heptadecanoic acid, the propylene glycol and the ascorbic acid, respectively adding the nano-silver particles and the copper difluoride powder into the mixed solution, and continuously stirring to form a paste; the brazing flux prepared by the method has good high-temperature fluidity and wettability, greatly improves the spreading area and depth of the brazing flux on a welding seam between an artificial diamond CVD strip and a metal powder sintered body, and further improves the firmness degree of the welding seam.
Example 5: this embodiment is substantially the same as embodiment 2 except that:
in the step S6, in the process of finish machining the diamond roller, the grinding mode is repeatedly carried out for 3 times, so that the circle run-out error of the surface of the diamond roller after being trimmed is 15 microns, and by grinding and finish machining the diamond roller, the swinging generated in the using process of the diamond roller is greatly reduced, the use safety is improved, and meanwhile, the diamond roller can be suitable for trimming equipment with higher rotating speed.
Example 6: this embodiment is substantially the same as embodiment 2 except that:
after the step S6 is finished, carrying out high-frequency quenching treatment on the finished diamond roller, and specifically operating as follows: and (3) placing the finished diamond roller into a high-frequency current inductor, quickly heating to 650 ℃ within 15s, then quickly cooling to room temperature within 8s, and performing high-frequency quenching treatment on the finished diamond roller to greatly improve the hardness of the finished diamond roller and prolong the service life of the finished diamond roller.
Example 7: a preparation method of a parallel surface CVD diamond roller comprises the following steps:
s1, preparing a rigid matrix according to the use working condition;
s2, uniformly coating adhesive on the inner cavity wall of the graphite mold, and manually arranging artificial diamond CVD strips with the thickness of 0.8 multiplied by 1.8mm, wherein the included angle between the artificial diamond CVD strips and the inner cavity wall of the graphite mold is 45 degrees and is arranged in a diamond shape; the adhesive is phenolic resin adhesive, and the artificial diamond CVD strips are bonded with the graphite die cavity arms through the phenolic resin adhesive, so that the arrangement stability of the artificial diamond CVD strips and the metal powder in the brazing process can be improved, and the smooth demolding of a sintered body is facilitated; the artificial diamond CVD strip is formed by mixing modified graphite powder, catalyst alloy powder and solvent components according to the volume ratio of 2:1:1, wherein the catalyst alloy powder is a mixture of iron powder, silicon powder and cobalt powder according to the volume ratio of 4:2:1, and the solvent components comprise, by weight, 25 parts of epoxy resin, 17 parts of n-butyl alcohol, 16 parts of hardened castor oil, 9 parts of methylsuccinic acid and 20 parts of fatty acid amide; the preparation method of the artificial diamond CVD strip comprises the following steps: uniformly mixing modified graphite powder, catalyst alloy powder and solvent components in proportion, continuously pressing for 2min at the temperature of 1200 ℃ and the pressure of 706MPa, performing pressure wrapping treatment for 5min, and cooling to obtain an artificial diamond CVD strip;
s3, placing the rigid matrix obtained in the step S1 in the center of a graphite mold, and uniformly coating a brazing flux on the surface of the rigid matrix and the diamond CVD strip layer; the brazing flux comprises 30 parts of styrene-maleic acid resin, 16 parts of heptadecanoic acid, 35 parts of propylene glycol, 10 parts of nano silver particles, 9 parts of copper difluoride powder and 19 parts of ascorbic acid in parts by weight, and the preparation method of the brazing flux comprises the following steps: respectively placing styrene-maleic acid resin, heptadecanoic acid, propylene glycol and ascorbic acid into a dispersing container, heating and stirring to completely dissolve the styrene-maleic acid resin, the heptadecanoic acid, the propylene glycol and the ascorbic acid, respectively adding the nano silver particles and the copper difluoride powder into the mixed solution, and continuously stirring to form a paste. The brazing flux prepared by the method has better high-temperature fluidity and wettability, greatly improves the spreading area and depth of the brazing flux on a welding seam between an artificial diamond CVD strip and a metal powder sintered body, and further improves the firmness degree of the welding seam;
s4, respectively weighing W80, Cu20 and transition layer metal powder, and uniformly mixing the W80 metal powder and the Cu20 metal powder, wherein the volume ratio of the W80 to the Cu20 metal powder is 1:1, and the volume ratio of the transition layer metal powder is 5% of that of the W80 and the Cu20 mixed metal powder; the total volume of W80, Cu20 and the transition layer metal powder is obtained by volume formula pi (r12-r22) x h, wherein r1 is the radius of the graphite mold, r2 is the radius of the rigid substrate, and h is the height of the rigid substrate; the transition layer metal powder is copper-nickel alloy powder, and by adding the transition layer metal powder layer, metal particles of W80 and Cu20 metal powder are more uniformly arranged in the sintering brazing process, so that holes are prevented from being generated in the metal powder brazing process, and the defects of the metal powder in the sintering brazing process are reduced;
s5, paving 50% of the total volume of the mixed metal powder obtained in the step S4 in a gap between a graphite die and a steel substrate, compacting under the pressure of 200Mpa by using a press machine, then paving transition layer metal powder, finally covering the residual mixed metal powder, and compacting the mixed metal powder again under the pressure of 200Mpa by using the press machine;
s6, placing the graphite mold obtained in the step S5 into a vacuum brazing furnace, and vacuumizing to 0.5 multiplied by 10-5Pa, slowly heating to 850 ℃ within 7min, preserving heat for 0.9h, finally taking out the sintered body, removing the die, naturally cooling to room temperature, and performing finish machining by taking the diamond as a reference according to the machining precision requirement of a drawing to obtain a finished diamond roller; in the process of finish machining of the diamond roller, a grinding mode is repeatedly carried out for 3-5 times, so that the circle run-out error of the surface of the diamond roller after being trimmed is 15 micrometers, the diamond roller is subjected to finish machining, the swing generated in the use process of the diamond roller is greatly reduced, the use safety is improved, and meanwhile, the diamond roller can be suitable for trimming equipment with higher rotating speed; carrying out high-frequency quenching treatment on the finished diamond roller, and specifically operating as follows: placing the finished diamond roller into a high-frequency current inductor, rapidly heating to 950 ℃ within 25s, and rapidly cooling to room temperature within 12s, wherein the hardness of the finished diamond roller is greatly improved and the service life of the finished diamond roller is prolonged by performing high-frequency quenching treatment on the finished diamond roller;
and S7, performing dynamic balance on the finished diamond roller obtained in the step S6, cleaning, coating antirust oil, and then packaging.
Experimental example: mechanical property detection is respectively carried out on the finished diamond rollers prepared in the embodiments 1 to 7, and the detection results are shown in table 1;
table 1: the mechanical property detection results of the finished diamond rollers prepared in the embodiments 1 to 7;
as can be seen from the table 1, by comparing the embodiment 2 with the embodiment, the hardness of the finished diamond roller can be greatly improved and the abrasion loss of the high-finished diamond roller can be reduced by arranging and pasting the synthetic diamond CVD strips and the inner cavity wall of the graphite mold in a 45-degree manner in a diamond shape; compared with the embodiment 2, the artificial diamond CVD strip prepared by the method has good crystal form, and has the advantages of high integrity and uniform granularity, so that the finished diamond roller has good hardness and impact strength, and the abrasion loss of the finished diamond roller is reduced; compared with the embodiment 2, the embodiment 4 has the advantages that due to the adoption of the brazing flux prepared by the method, the spreading area and the depth of the brazing flux on a welding seam between the artificial diamond CVD strip and the metal powder sintered body are greatly increased, and the impact resistance of a finished diamond roller is improved; compared with the embodiment 2, the embodiment 5 has the advantages that the round runout error of the surface of the diamond roller is improved due to the grinding and finishing of the finished diamond roller; compared with the embodiment 2, the embodiment 6 has the advantages that the hardness of the finished diamond roller is improved due to the high-frequency quenching treatment of the finished diamond roller, and the abrasion loss is reduced.
Claims (7)
1. A method for preparing a parallel surface CVD diamond roller is characterized by comprising the following steps:
s1, preparing a rigid matrix according to the use working condition;
s2, uniformly coating adhesive on the inner cavity wall of the graphite mold, and manually arranging artificial diamond CVD strips with the thickness of 0.8 multiplied by 1.8mm, wherein the included angle between the artificial diamond CVD strips and the inner cavity wall of the graphite mold is 15-90 degrees and is arranged in a diamond shape;
s3, placing the steel substrate in the step S1 in the center of a graphite mold, and uniformly coating a brazing flux on the surface of the steel substrate and the diamond CVD strip layer;
s4, respectively weighing W80, Cu20 and transition layer metal powder, and mixingThe W80 and Cu20 metal powders are uniformly mixed, wherein the volume ratio of the W80 to the Cu20 metal powders is 1:1, and the volume ratio of the transition layer metal powders is 2-9% of that of the W80 and Cu20 mixed metal powders; the total volume of the W80, the Cu20 and the transition layer metal powder is represented by a volume formula pi (r 1)2-r22) X h can be obtained, wherein r1 is the radius of the graphite mold, r2 is the radius of the rigid matrix, and h is the height of the rigid matrix;
s5, paving 40-70% of the total volume of the mixed metal powder obtained in the step S4 into a gap between a graphite mold and a steel substrate, compacting by a press machine at the pressure of 100-200mpa, paving the transition layer metal powder, covering the residual mixed metal powder, and compacting the mixed metal powder again by the press machine at the pressure of 100-200 mpa;
s6, placing the graphite mold obtained in the step S5 into a vacuum brazing furnace, and vacuumizing to 0.2 multiplied by 10-5-1.2×10-5Pa, slowly raising the temperature to 780-890 ℃ within 5-10min, preserving the heat for 0.5-1.2h, finally taking out the sintered body and removing the mold, naturally cooling to room temperature, and performing finish machining by taking the diamond as the reference according to the processing precision requirement of a drawing to obtain a finished diamond roller;
and S7, performing dynamic balance on the finished diamond roller obtained in the step S6, cleaning, coating antirust oil, and then packaging.
2. A method of manufacturing a parallel-faced CVD diamond roller according to claim 1, wherein the binder is a phenol resin binder in step S2.
3. The method for preparing a parallel surface CVD diamond roller according to claim 1, wherein in step S2, the synthetic diamond CVD strip is prepared by mixing modified graphite powder, catalyst alloy powder and solvent component according to a volume ratio of 2:1:1, wherein the catalyst alloy powder is a mixture of iron powder, silicon powder and cobalt powder according to a volume ratio of 4:2:1, and the solvent component comprises, by weight, about 15-25 parts of epoxy resin, 5-17 parts of n-butanol, 2-16 parts of hardened castor oil, 1-9 parts of methyl succinic acid and 10-20 parts of fatty acid amide; the preparation method of the artificial diamond CVD strip comprises the following steps: and uniformly mixing the modified graphite powder, the catalyst alloy powder and the solvent component according to the proportion, continuously pressing for 0.5-2min under the conditions that the temperature is 960-.
4. The method of claim 1, wherein the brazing flux comprises 15-30 parts by weight of styrene-maleic acid resin, 7-16 parts by weight of heptadecanoic acid, 15-35 parts by weight of propylene glycol, 5-10 parts by weight of nano silver particles, 4-9 parts by weight of copper difluoride powder and 12-19 parts by weight of ascorbic acid, and the method comprises the following steps: respectively placing styrene-maleic acid resin, heptadecanoic acid, propylene glycol and ascorbic acid into a dispersing container, heating and stirring to completely dissolve the styrene-maleic acid resin, the heptadecanoic acid, the propylene glycol and the ascorbic acid, respectively adding the nano silver particles and the copper difluoride powder into the mixed solution, and continuously stirring until the solution is pasty.
5. The method for manufacturing a parallel surface CVD diamond roller according to claim 1, wherein in the step S6, the diamond roller is finished, and the grinding method is repeated for 3-5 times, so that the circle run-out error of the finished diamond roller surface is reduced to less than 20 μm.
6. The method for manufacturing a parallel-surface CVD diamond roller according to claim 1, wherein in step S4, the transition layer metal powder is a copper-nickel alloy powder.
7. A method of manufacturing a parallel-faced CVD diamond roller according to claim 1, wherein in step S2, the binder is a resin binder.
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