CN111515872A - Powder metallurgy integrated forming method for hollow diamond - Google Patents
Powder metallurgy integrated forming method for hollow diamond Download PDFInfo
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- CN111515872A CN111515872A CN202010279676.4A CN202010279676A CN111515872A CN 111515872 A CN111515872 A CN 111515872A CN 202010279676 A CN202010279676 A CN 202010279676A CN 111515872 A CN111515872 A CN 111515872A
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- grinding wheel
- hollow
- powder metallurgy
- diamond
- diamond grinding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
- B24D3/10—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for porous or cellular structure, e.g. for use with diamonds as abrasives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention relates to the technical field of grinding of metal bond diamond, in particular to a powder metallurgy integrated forming method of hollow diamond, which comprises the following steps: mixing 58.5-70 wt% of diamond powder, 29.5-40 wt% of copper powder and 0.5-1.5 wt% of binder in a mixer, and sieving to obtain molding raw material; placing the molding raw materials into a fixed die of a hydraulic press to mold a discharging blank body, and pressing the blank body by an indentation die to generate a blank body with a hollow hole; filling hydrolytic substances into the hollow holes of the blank body, and performing hot press molding to obtain a grinding wheel blank body; drying and sintering the grinding wheel blank to obtain a semi-finished product; and removing the hydrolyzed substances to obtain the hollow diamond grinding wheel. The invention has the characteristics of reliable process, simplicity, easy realization, low manufacturing cost, high efficiency, energy saving, safety and the like, and the produced hollow diamond has the characteristics of high precision, high strength, high hardness, good wear resistance, easy installation, good cooling effect, good chip removal and chip containing effect and the like.
Description
Technical Field
The invention relates to the technical field of grinding of metal bond diamond, in particular to a powder metallurgy integrated forming method of hollow diamond.
Background
The diamond grinding wheel is a metal bond diamond grinding wheel and is generally manufactured by adopting a powder metallurgy sintering process. The diamond grinding wheel is mainly used for grinding, drilling, turning and milling, cutting or grooving in the manufacturing process of precious materials, electronic devices, glass and the like, and when a large amount of diamond grinding wheels work, the problems of aggravation of friction, temperature rise and the like of a working area are easily caused due to large cutting depth, unsmooth chip removal, difficulty in entering of cooling liquid and the like, so that the working quality and the working efficiency are influenced. In order to enhance the chip removal capability and the cooling capability, a common method is to arrange groove structures which are beneficial to chip removal (chip containing) and water passing (water containing) on a working layer of the diamond, and the groove structures are generally formed at one time by adopting a preset mode of a die to manufacture the tooth-shaped diamond grinding wheel with the groove.
The powder metallurgy process needs to be formed by hot-pressing sintering through a die, and has higher requirement on the thermal state strength of the die. In the prior art, a water gap block made of materials such as a graphite mold, a cast iron mold, an alloy mold and the like is usually arranged in a mold in advance, and after hot-pressing sintering, the nozzle block is formed by disassembling (pulling) the nozzle block, so the nozzle block needs to have the characteristics of difficult deformation and difficult fracture during mold disassembling (pulling), the graphite nozzle block has the characteristic of frangibility, and in order to overcome the defect, enough solid sectional area, especially on the main pressure bearing surface, needs to be designed in each direction of the nozzle block, however, the nozzle block with such a structure is inevitably large in volume, and further, the interval between the diamond teeth is large (namely, the width of the groove body is large), the width of the groove body is large, the cooling of the processed material is favorable, but the cooling effect of the diamond working layer is very limited, in the intermittent grinding, the impact force and the bounce of the grinding wheel are large, so that the surface roughness of the workpiece is increased.
Under the condition that the geometric dimension of the grinding wheel is restricted, the larger the volume and the larger the number occupied by the groove body are, the smaller the volume of the diamond working layer is. Therefore, the volume of the water gap block is limited by manufacturing process conditions such as strength and the like and can not be too small, when the diamond working layer has enough volume (namely enough service life) is ensured, the number of the groove bodies is objectively limited, the number of the groove bodies is limited, and further the diamond working teeth are limited to be thinner without space in the circumferential direction, so that the circumferential chip removal path is long, the accumulated amount of chips is large, the heat productivity of the grinding wheel during working is also large, and when the grinding wheel is fed and processed at high speed or high speed, the condition is very big! Generally, the particle size of diamond needs to be increased to improve the chip containing space and alleviate the situation, but the increase of the particle size is not beneficial to the reduction of the surface roughness of the workpiece.
The wider and smaller the groove, the smaller the outer surface area (including the grinding surface and the non-grinding surface) of the grinding wheel working layer entity, i.e. the smaller the area acted by cooling water, the poorer the cooling effect.
The diamond grinding wheel is manufactured by adopting a powder metallurgy process, the flowability of metal powder (binding agent) is poor in the manufacturing process of high temperature and high pressure, if the structure of a die is too complex, pressure transmission is affected, and the compactness of the diamond grinding wheel is uneven to generate performance deviation, so that some complex structures cannot be manufactured by adopting the powder metallurgy process, such as teeth in the shapes of thin, sharp, long, thin, net and the like, under the hot pressing condition, the performance of the die material cannot meet the process requirement, so that the process cannot be finished by a mode of presetting the die, and the production economic cost is high.
The diamond grinding wheel product manufactured by the prior art can realize that the number of the arranged groove bodies is small and the occupied volume of the groove bodies is large through the presetting of the die, the shape of the diamond teeth is simple and thick, the effect is very limited, and if a post-processing mode is adopted, the processing difficulty is large generally, so that the cost is increased. With the continuous development of the technology, high-quality, high-speed and high-efficiency processing is inevitable, and products in the prior art are difficult to adapt.
Disclosure of Invention
The invention provides a powder metallurgy integrated forming method of hollow diamond, which has the characteristics of reliable process, simplicity, easy realization, low manufacturing cost, high efficiency, energy conservation, safety and the like, and the produced hollow diamond has the characteristics of high precision, high strength, high hardness, good wear resistance, easy installation, good cooling effect, good chip removal and chip containing effect and the like.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a powder metallurgy integrated forming method of a hollow diamond grinding wheel comprises the following steps:
(1) mixing 58.5-70 wt% of diamond powder, 29.5-40 wt% of copper powder and 0.5-1.5 wt% of binder in a mixer, and sieving to obtain molding raw material;
(2) placing the molding raw materials into a fixed die of a hydraulic press to mold a discharging blank body, and pressing the blank body by an indentation die to generate a blank body with a hollow hole;
(3) filling hydrolytic substances into the hollow holes of the blank body, and performing hot press molding to obtain a grinding wheel blank body;
(4) drying and sintering the grinding wheel blank to obtain a semi-finished product;
(5) and removing the hydrolyzed substances to obtain the hollow diamond grinding wheel.
In the step (1), the molding raw material formula components are preferably as follows:
58.5 to 66.5 percent of diamond powder, 232.6 to 40 percent of copper powder and 0.9 to 1.5 percent of binder, or 66 to 70 percent of diamond powder, 29.5 to 33.5 percent of copper powder and 0.5 to 0.8 percent of binder.
Preferably, the step (5) is specifically: dissolving the hydrolytic substance in water or removing the hydrolytic substance by hollowing, ultrasonic vibration and air blowing. The hollow diamond grinding wheel can be obtained after the hydrolytic substance is dissolved in water, the operation process is simple, the operation process is not limited by the structure of the diamond grinding wheel, and the influence on the diamond grinding wheel caused by direct processing of the diamond in the production and processing process is avoided, so that the production quality is further influenced.
Preferably, the ultrasonic frequency of the hollowing, the ultrasonic vibration and the air blowing for removing the hydrolytic substances is as follows: 20-40 kHz; and blowing out the hydrolyzed substance by using an industrial air compressor through an air gun of 0.4-0.8Mpa during air blowing. The method does not need to process on the hard diamond grinding wheel through manual work or machining, and further avoids abrasion to the quality of the diamond grinding wheel.
Preferably, the mixing time of the mixing in the step (1) is as follows: 18-23 hours. The mixing time is preferably 20 hours, and the diamond powder, the copper powder and the binder can be well mixed and subjected to sufficient chemical reaction during mixing, so that the hardness of the diamond grinding wheel can be enhanced.
Preferably, in the step (2), the temperature of a fixed die for molding the fixed die of the hydraulic press is set to be 250-260 ℃, the pressure is set to be 120-125 MPa, and the pressure maintaining time is 2-3 hours. The setting of the parameters can rapidly form the blank.
Preferably, in the step (3), the hot pressing temperature is 250-300 ℃, the pressure is 100-125 MPa, and the pressure maintaining time is 2-3 hours. The parameter setting is beneficial to quickly obtaining the needed grinding wheel blank.
Preferably, the step (4) specifically includes the following steps:
drying the grinding wheel blank at room temperature for 5-7 hours, and drying in an oven at the temperature of 50-70 ℃ for 12-24 hours;
and putting the dried grinding wheel blank into a sintering furnace for sintering. The grinding wheel blank is dried for 5-7 hours, preferably 6 hours at room temperature, and then is dried in an oven, so that the grinding wheel blank can be dried uniformly, the production quality is ensured, and quality defects of cracks, uneven drying inside and outside and the like caused after the grinding wheel blank is dried are avoided.
Preferably, the sintering process of the sintering furnace comprises the following steps: heating to 180-220 ℃ at the speed of 2-3 ℃/min, and preserving heat for 20-30 min, wherein the grinding wheel blank is changed into a hard state from a brittle blank body in the process;
and then heating to 800-900 ℃ at the speed of 2 ℃/min, preserving the heat for 20-30 min, and cooling to room temperature, wherein the combination of the diamond grinding wheel is reinforced. The step ensures that the grinding wheel blank body can be well molded, no crack is generated in the molding process, and the production quality is good.
Preferably, the hydrolysis material is: lime or graphite strips.
Preferably, the binder is: lime.
The powder metallurgy integrated forming method of the hollow diamond grinding wheel has the following beneficial effects:
1, the water soluble substance is filled in the hollow hole of the blank body and is molded integrally, and then the water soluble substance is removed, so that the production process is simple and easy to realize, the production cost is reduced, the safety in the production process is improved, the damage to the diamond grinding wheel is avoided, and the quality of the produced product is improved.
2. The hollow diamond grinding wheel produced by the method has the characteristics of high precision, high strength, high hardness, good wear resistance, easiness in installation, good cooling effect, chip removal effect, good chip containing effect and the like.
Drawings
FIG. 1 is a flowchart showing the steps of example 1 of the powder metallurgy integral molding method of a hollow diamond wheel according to the present invention.
FIG. 2 is a flow chart showing the steps of embodiment 2 of the powder metallurgy integral molding method of a hollow diamond grinding wheel according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are for reference and illustration only and are not to be construed as limiting the scope of the invention.
Example 1:
referring to fig. 1, the powder metallurgy integral forming method of the hollow diamond grinding wheel of the present invention includes the following steps:
70 percent of diamond powder, 29.5 percent of copper powder and 0.5 percent of binder are mixed in a mixer and sieved to obtain a molding raw material. Specifically, 58.5% by weight of diamond powder and 40% by weight of copper powder are taken and put into a mixer, 1.5% by weight of binder based on the total weight of the raw materials is added, mixed for 20 hours, preferably 18 hours and 23 hours, and sieved to obtain a molding material. More specifically, the preferred weight percentages of the diamond powder, the copper powder and the binder are 58.5%, 40% and 1.5%, respectively, and the preferred weight percentages of the diamond powder, the copper powder and the binder may also preferably be: 61%, 38% and 1%. Furthermore, the molding raw material can be sieved by a mesh sieve when being sieved. The binder is lime.
And placing the molding raw materials into a fixed die of a hydraulic press to mold a discharge blank, and pressing the blank by an indentation die to generate a blank with a hollow hole. Specifically, the molding material is placed into a hydraulic press, which is set to: and (3) keeping the temperature at 250 ℃ and the pressure at 125MPa for 3 hours, preferably at 255 ℃ and the pressure at 123MPa for 1.5 hours, or preferably at 260 ℃ and the pressure at 120MPa for 2 hours, carrying out fixed die forming on the forming material, and pressing the forming material by using a stamping die to generate a blank with a hollow hole.
Filling hydrolytic substances into the hollow holes of the blank body, and carrying out hot press molding to obtain the grinding wheel blank body. Specifically, filling hydrolytic substances in the hollow hole of the blank body, leveling the hydrolytic substances, and putting the hydrolytic substances into a fixed die of a hydraulic press for hot pressing, wherein the parameters of the hydraulic press are as follows: the temperature is 200 ℃, the pressure is 125MPa, and the pressure is maintained for 2h, preferably: the temperature is 300 ℃, the pressure is 100MPa, and the pressure is maintained for 1.5h, or preferably: keeping the temperature at 280 ℃ and the pressure at 112MPa for 3h, and then cooling and demolding to obtain a grinding wheel blank. The hydrolysis substance is: lime or graphite strips.
And drying the grinding wheel blank at room temperature for 7 hours, and drying in an oven at the temperature of 50 ℃ for 12 hours. Specifically, the drying time is preferably: room temperature 5h, oven 70 ℃, 24h, or preferably: room temperature 6h, oven 60 deg.C, 18 h.
And putting the dried grinding wheel blank into a sintering furnace for sintering. Specifically, heating to 200 ℃ at a speed of 2 ℃/min, preserving heat for 30min, starting sintering and combining the grinding wheel blank with copper powder, heating to 800 ℃ at a speed of 2 ℃/min, preserving heat for 30min, completing sintering of the grinding wheel blank, cooling to room temperature, and taking out a semi-finished product. Further, the step may also preferably be: heating to 200 deg.C at 3 deg.C/min, maintaining for 20min, heating to 900 deg.C at 2 deg.C/min, maintaining for 20min, cooling to room temperature, and taking out the semi-finished product.
Dissolving the hydrolyzed material in water. Specifically, the hydrolysate in the sintered product is dissolved to obtain the diamond grinding wheel with any shape characteristic of the hollow hole. And further, processing the sintered grinding wheel blank on a lathe and a grinding machine, packaging after the grinding wheel blank is qualified through inspection, and warehousing to obtain a finished product.
Example 2:
referring to fig. 2, the powder metallurgy integral forming method of the hollow diamond grinding wheel of the present invention includes the following steps:
this example 2 differs from example 1 only in that: the step "dissolving the hydrolyzed material in water" is replaced by:
and removing the hydrolytic substances through hollowing, ultrasonic vibration and air blowing. Specifically, the hydrolyzed substance in the semi-finished product is manually emptied, subjected to ultrasonic vibration, blown by air, and blown out through an air gun to remove impurities. More specifically, the ultrasonic frequency of the ultrasonic vibration is 20-40kHz, and the hydrolysis substances are blown out by an industrial compressor through an air gun of 0.4-0.8Mpa during air blowing. And further, processing the sintered grinding wheel blank on a lathe and a grinding machine, packaging after the grinding wheel blank is qualified through inspection, and warehousing to obtain a finished product. Other steps are similar to those in embodiment 1, and are specifically described with reference to embodiment 1 and will not be repeated herein.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention.
Claims (10)
1. A powder metallurgy integrated forming method of a hollow diamond grinding wheel is characterized by comprising the following steps:
(1) mixing 58.5-70 wt% of diamond powder, 29.5-40 wt% of copper powder and 0.5-1.5 wt% of binder in a mixer, and sieving to obtain molding raw material;
(2) placing the molding raw materials into a fixed die of a hydraulic press to mold a discharging blank body, and pressing the blank body by an indentation die to generate a blank body with a hollow hole;
(3) filling hydrolytic substances into the hollow holes of the blank body, and performing hot press molding to obtain a grinding wheel blank body;
(4) drying and sintering the grinding wheel blank to obtain a semi-finished product;
(5) and removing the hydrolyzed substances to obtain the hollow diamond grinding wheel.
2. The powder metallurgy integral forming method of the hollow diamond grinding wheel according to claim 1, wherein the step (5) is specifically: dissolving the hydrolytic substance in water or removing the hydrolytic substance by hollowing, ultrasonic vibration and air blowing.
3. The powder metallurgy integral forming method of a hollow diamond grinding wheel according to claim 2, wherein the ultrasonic frequency of the hollowing, ultrasonic vibration and air blowing removal of the hydrolytic substance is as follows: 20-40 kHz; and blowing out the hydrolyzed substance by using an industrial air compressor through an air gun of 0.4-0.8Mpa during air blowing.
4. The powder metallurgy integral forming method of the hollow diamond grinding wheel according to claim 1, wherein the mixing time of the mixed materials in the step (1) is as follows: 18-23 hours.
5. The powder metallurgy integral molding method of a hollow diamond grinding wheel according to claim 1, wherein in the step (2), the temperature of the fixed die for the hydraulic press fixed die molding is set to 250 to 260 ℃, the pressure is set to 120 to 125MPa, and the pressure holding time is 2 to 3 hours.
6. The method for powder metallurgy integral molding of a hollow diamond grinding wheel according to claim 1, wherein in the step (3), the hot pressing temperature is 250 to 300 ℃, the pressure is 100 to 125MPa, and the pressure holding time is 2 to 3 hours.
7. The powder metallurgy integral molding method of a hollow diamond grinding wheel according to claim 1, wherein the step (4) specifically comprises the steps of:
and drying the grinding wheel green body at room temperature for 5-7 hours, and then drying in an oven at the temperature of 50-70 ℃.
And putting the dried grinding wheel blank into a sintering furnace for sintering.
8. The method for integrally molding a hollow diamond grinding wheel through powder metallurgy according to claim 7, wherein the sintering process of the sintering furnace comprises the following steps: heating to 180-220 ℃ at the speed of 2-3 ℃/min, and preserving heat for 20-30 min, wherein the grinding wheel blank is changed into a hard state from a brittle blank body in the process;
and then heating to 800-900 ℃ at the speed of 2 ℃/min, preserving the heat for 20-30 min, and cooling to room temperature, wherein the combination of the diamond grinding wheel is reinforced.
9. A method for powder metallurgy integration of hollow diamond grinding wheels according to any one of claims 1 to 3, wherein the hydrolytic substance is: lime or graphite strips.
10. The method for powder metallurgy integral molding of a hollow diamond grinding wheel according to claim 1, wherein the binder is: lime.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010279676.4A CN111515872B (en) | 2020-04-10 | 2020-04-10 | Powder metallurgy integrated forming method for hollow diamond |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010279676.4A CN111515872B (en) | 2020-04-10 | 2020-04-10 | Powder metallurgy integrated forming method for hollow diamond |
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| CN111515872B CN111515872B (en) | 2022-01-11 |
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| CN202079516U (en) * | 2011-06-03 | 2011-12-21 | 福建万龙金刚石工具有限公司 | Sintering die used for diamond turbine bowl grinding |
| CN202934469U (en) * | 2012-10-31 | 2013-05-15 | 郑州三泰金刚石砂轮有限公司 | Diamond grinding wheel die provided with water tank |
| JP2016068245A (en) * | 2014-09-24 | 2016-05-09 | 伊藤 幸男 | Grinding wheel having grooves and manufacturing method for the same |
| CN109227412A (en) * | 2018-09-07 | 2019-01-18 | 杨凌美畅新材料股份有限公司 | A kind of preparation method of sector diamond segment |
| CN110625122A (en) * | 2018-06-25 | 2019-12-31 | 晟铭电子科技股份有限公司 | Hollow member and method for producing same |
| CN110948381A (en) * | 2019-12-05 | 2020-04-03 | 华侨大学 | Groove grinding disc and manufacturing method thereof |
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2020
- 2020-04-10 CN CN202010279676.4A patent/CN111515872B/en not_active Expired - Fee Related
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB687598A (en) * | 1949-09-20 | 1953-02-18 | Gen Motors Corp | Improved method of making porous metal articles |
| US4591470A (en) * | 1982-10-04 | 1986-05-27 | Namba Press Works Co., Ltd. | Process for preparing structural bodies of granular material |
| EP0242410B1 (en) * | 1986-04-17 | 1990-06-06 | Carborundum Schleifmittelwerke GmbH | Method of manufacturing an elastic grinding body |
| JPH10329034A (en) * | 1997-05-29 | 1998-12-15 | Asahi Diamond Ind Co Ltd | Manufacture for segment tip |
| CN101511533A (en) * | 2006-07-19 | 2009-08-19 | 因诺派德公司 | Polishing pad having micro-grooves on the pad surface |
| US20100290942A1 (en) * | 2009-05-15 | 2010-11-18 | Gm Global Technolgoy Operations, Inc. | Systems and methods to produce forged powder metal parts with transverse features |
| CN202079516U (en) * | 2011-06-03 | 2011-12-21 | 福建万龙金刚石工具有限公司 | Sintering die used for diamond turbine bowl grinding |
| CN202934469U (en) * | 2012-10-31 | 2013-05-15 | 郑州三泰金刚石砂轮有限公司 | Diamond grinding wheel die provided with water tank |
| JP2016068245A (en) * | 2014-09-24 | 2016-05-09 | 伊藤 幸男 | Grinding wheel having grooves and manufacturing method for the same |
| CN110625122A (en) * | 2018-06-25 | 2019-12-31 | 晟铭电子科技股份有限公司 | Hollow member and method for producing same |
| CN109227412A (en) * | 2018-09-07 | 2019-01-18 | 杨凌美畅新材料股份有限公司 | A kind of preparation method of sector diamond segment |
| CN110948381A (en) * | 2019-12-05 | 2020-04-03 | 华侨大学 | Groove grinding disc and manufacturing method thereof |
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| CN111515872B (en) | 2022-01-11 |
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