CN108724025A - A kind of ordering arrangement metal anchoring agent diamond wheel and preparation method thereof - Google Patents
A kind of ordering arrangement metal anchoring agent diamond wheel and preparation method thereof Download PDFInfo
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- CN108724025A CN108724025A CN201810472042.3A CN201810472042A CN108724025A CN 108724025 A CN108724025 A CN 108724025A CN 201810472042 A CN201810472042 A CN 201810472042A CN 108724025 A CN108724025 A CN 108724025A
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- diamond
- ordering
- spheric granules
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- anchoring agent
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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
-
- 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
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention discloses the preparation methods that a kind of ordering arranges metal anchoring agent diamond wheel, including 1）Batch mixing：Diamond, the ethanol solution of glycerine, metallic bond powder, stearic ethanol solution is taken to be mixed to get mixed powder；2）It is granulated：Mixed powder is rolled to be granulated and obtains spheric granules；3）Screening, type selecting processing：Spheric granules is dried, then screening and type selecting are carried out to spheric granules；4）Ordering treatment：Spheric granules after screening and type selecting is applied into sinusoidal vibration both horizontally and vertically, and cold moudling obtains grinding wheel green compact；5）Sintering：The skive of ordering arrangement is obtained after grinding wheel green compact is sintered.Diamond of the present invention uniform sequential arrangement in metallic bond improves grinding efficiency and the service life of grinding wheel, and process repeatability is stronger, operation difficulty is lower, production efficiency higher.
Description
Technical field
The invention belongs to superhard material grinding tool preparing technical fields, and in particular to a kind of ordering arrangement metallic bond gold
Hard rock grinding wheel and preparation method thereof.
Background technology
Surface grinding is the important procedure in material processing, and metal anchoring agent diamond wheel has grinding efficiency height, mill
The advantages that precision is high, surface quality is good, service life is long is cut, metal materials and the semiconductors such as non-Ferrious material, alloy are suitable for
The grinding of the nonmetallic materials such as material, ceramics, glass.
Under normal conditions, the random distribution in bonding agent of the diamond in most grinding wheels, due to the distribution shape to diamond
State lacks effective control, unavoidably there is the accumulation regions of diamond distribution and rare area.Diamond is easy in accumulation regions
It just falls off before not playing ablation or cannot effectively go out sword, decline so as to cause grinding wheel sharpness；Single Buddha's warrior attendant in rare area
Stone stress is excessive to be easily broken or falls off, so as to cause the reduction of wheel life.Therefore, in the grinding process of skive,
It can realize that the diamond being effectively ground only accounts for less part, the extra diamond severe jamming normal work of grinding wheel,
The raising of wheel grinding power and grinding temperature is caused, grinding efficiency declines or even the surface damage of workpiece.
To solve the above problem occurred in diamond wheel grinding processing, a kind of control diamond of present invention offer is in gold
Belong to the distribution in anchoring agent diamond grinding wheel, the effective ways of optimization diamond arrangement, by forming diamond-metallic bond
Spherical structure and rule vibrations make spherical structure ordering arrange, with make ordering arrangement metal-bonded diamond
Grinding wheel.The template that the method such as U.S. Patent 6039641 that being disclosed in existing patent makes diamond orderization arrange are used
The mull technique that the negative-pressure adsorption method and 105415215 A of patent CN that method, 101745877 A of patent CN are used use, but
The problems such as that there are operation difficulties is big for the above method, and process repeatability is poor, and template will appear in cloth flock together it is existing
As, negative-pressure adsorption subtraction unit is excessively complicated and sucker suction is unable to reach good effect.
Invention content
The present invention provides a kind of orderings to arrange metal anchoring agent diamond wheel, and diamond is in metal in the grinding wheel
Uniform sequential arrangement in bonding agent improves grinding efficiency and the service life of grinding wheel, and compared with existing preparation method, technique can weigh
Renaturation is stronger, operation difficulty is lower, production efficiency higher.
Based on above-mentioned purpose, the present invention adopts the following technical scheme that.
The spheric granules coated as the metallic bond of core using diamond is formed, with the natural packing state of spheric granules
As the original state of vibrational system, under the action of two horizontal directions are just giving a vertical direction sinusoidal vibration each other,
Spheric granules does regular motion statistically, and fills spheric granules gap until that cannot continue to fill up, and is finally reached spherical shape
The closestpacking state of particle realizes the tightly packed rear ordering arrangement for obtaining spheric granules.
Specific implementation process is as follows, includes the following steps：
1）Batch mixing：Diamond, the ethanol solution of glycerine, metallic bond powder, stearic ethanol solution is taken to be mixed to get mixed
Close powder.
2）It is granulated：Mixed powder is rolled to be granulated and obtains coating by core, metallic bond powder of diamond particles
Spheric granules.
3）Screening, type selecting processing：Spheric granules is dried, then screening and type selecting are carried out to spheric granules.
4）Ordering treatment：Spheric granules after screening and type selecting is applied into sinusoidal vibration both horizontally and vertically, and
Cold moudling obtains grinding wheel green compact.
5）Sintering：The sintering of grinding wheel green compact is obtained into the skive of ordering arrangement.
Further, the concrete mode of the raw material mixing is：The ethanol solution 0.05- of glycerine is added in a diamond
Stearic ethanol solution 0.03-0.05ml/g is added in uniform stirring after 0.15ml/g in metallic bond powder, then will
Diamond obtains mixed powder after uniformly mixing 60-120min in three-dimensional material mixer with metallic bond powder.
In the present invention, the ethanol solution 0.05-0.15ml/g that glycerine is added in the diamond is referred in every g diamonds
The glycerol-alcohol solution of 0.05-0.15mL is added；Stearic ethanol solution 0.03- is added in metallic bond powder
0.05ml/g refers to the stearic acid ethanol solution that 0.03-0.05ml is added in every g metallic bonds powder.
The content 10-15% of the glycerine in ethanol, the content 2-5% of stearic acid in ethanol.
Further, in the mixed powder diamond a concentration of 100-200%, the granularity of diamond is not less than 120/
140；The metallic bond is copper and tin metallic bond, composition 75%Cu+15%Sn+2%Ni+8%Co.
Further, the concrete mode being granulated that rolls is：Mixed powder is placed in comminutor and is granulated, setting is granulated
Machine rotary speed is 70-120rpm.
Further, it is the 1.2-1.8 of diamond that the standard of the spheric granules screening, which is the average grain diameter of spheric granules,
Times, average grain diameter difference is no more than ± 10%；The standard of spheric granules type selecting is that draw ratio is no more than 1.3.
Further, the method for the ordering treatment is：It is horizontal that at least two are applied to spheric granules on electromagnetic vibration machine
The sinusoidal vibration of direction sinusoidal vibration orthogonal each other and at most one vertical direction.
Further, the amplitude of each direction sinusoidal vibration is 0.7-1.5mm, frequency 300-450Hz, when vibration
Between 40-60min.
Further, the sintering method is：730-780 DEG C of temperature on hot press is burnt under the conditions of pressure 40-50MPa
Tie 10-30min.
Ordering arrangement metal anchoring agent diamond wheel of the present invention can be applied to the gold such as non-Ferrious material, alloy
The grinding for belonging to the nonmetallic materials such as material and semi-conducting material, ceramics, glass is closed particularly with vitrified CBN wheel, hard
The ground effect of the plane of gold is good.
Beneficial effects of the present invention：
1）The technical solution adopted by the present invention can realize ordering arrangement of the diamond in grinding wheel, optimize diamond in grinding wheel
In distribution, and have higher arrangement precision.
2）The technical solution adopted by the present invention improves utilization rate of the diamond in grinding process, improves boart boart
The grinding efficiency and service life of wheel.
3）The technical solution adopted by the present invention compared with prior art, avoids complicated refinement, reduces life
The operation difficulty of production process, process repeatability is strong, is produced convenient for procedure.
Description of the drawings
Fig. 1 is ordering arrangement and partial enlarged view of 1 diamond of the embodiment of the present invention in grinding wheel；
Fig. 2 is the embodiment of the present invention 2（On）With comparative example 1（Under）Arrangement Contrast on effect of the diamond in grinding wheel is as schemed.
Specific implementation mode
Embodiment of the present invention is described in detail below in conjunction with specific embodiment, but following embodiment is only used for
Illustrate the present invention, without that should be to limit the scope of the invention.
The granulometry of diamond and spheric granules of the present invention is executed according to GB/T6406-1996；
MBD diamonds, RVD diamonds, glycerine, ethyl alcohol, stearic acid are commercial product；
The ethanol solution of the glycerine and stearic ethanol solution are mixed according to percent by volume；
The copper and tin metallic bond powder of the 75%Cu+15%Sn+2%Ni+8%Co refers to Cu, Sn, Ni, Co gold of 400 mesh of granularity
Belong to powder to mix according to mass percent.
Embodiment 1
A kind of preparation method of ordering arrangement metal anchoring agent diamond wheel, includes the following steps：
1）Batch mixing：The MBD diamonds that 40g granularities are 40/45 are weighed, glycerol content 15% is added（Volume fraction）Ethanol solution
Then uniform stirring after 2mL is added in the copper and tin metallic bond powder that 310g ingredients are 75%Cu+15%Sn+2%Ni+8%Co
Stearic acid content 5%（Volume fraction）Ethanol solution 15mL, in three-dimensional material mixer by diamond and metallic bond powder
Mixed powder is obtained after even mixing 60min.
2）It is granulated：Mixed powder is granulated in GA240 type comminutors, sets rotary speed 120rpm, rolling was granulated
Cheng Zhong, diamond particles gradually coat bonding agent powder, obtain the spherical shape coated as core, bonding agent powder using diamond particles
Particle.
3）Screening, type selecting processing：By step 2）In the obtained spheric granules drying and processing at 120 DEG C in vacuum drying chamber
60min, then screening and type selecting are carried out to spheric granules, wherein the standard for sieving spheric granules is the granularity 25/ of spheric granules
30, grain size difference is no more than ± 10%；It is that draw ratio is no more than 1.3 to the standard of spheric granules type selecting using diamond model selection machine.
4）Ordering treatment：By step 3）Treated, and spheric granules 150g is fitted into steel mold, and is fixed on electromagnetic vibration
In motivation, apply the sinusoidal vibration of two horizontal directions sinusoidal vibration and a vertical direction orthogonal each other, electromagnetic vibration is set
The amplitude of three direction of vibration of motivation is 1.5mm, and steel mold is then placed in oil pressure by frequency 300Hz, time of vibration 40min
Cold moudling on machine, briquetting pressure 90MPa obtain the grinding wheel green compact of diameter 120mm.
5）Sintering：By step 4）In obtained grinding wheel green compact be fitted into graphite jig, 780 DEG C of temperature on hot press, pressure
15min is sintered under the conditions of power 40MPa to get the skive arranged to ordering, diamond particles are orderly in grinding wheel
Change arrangement and partial enlarged view is as shown in Figure 1.
Embodiment 2
A kind of preparation method of ordering arrangement metal anchoring agent diamond wheel, includes the following steps：
1）Batch mixing：The MBD diamonds that 60g granularities are 40/45 are weighed, glycerol content 15% is added（Volume fraction）Ethanol solution
Then uniform stirring after 4mL is added in the copper and tin metallic bond powder that 230g ingredients are 75%Cu+15%Sn+2%Ni+8%Co
Stearic acid content 5%（Volume fraction）Ethanol solution 10mL, in three-dimensional material mixer by diamond and metallic bond powder
Mixed powder is obtained after even mixing 60min；
2）It is granulated：Mixed powder is granulated in GA240 type comminutors, sets rotary speed 100rpm, is rolled in granulation process,
Diamond particles gradually coat bonding agent powder, obtain the spheric granules coated as core, bonding agent powder using diamond particles.
3）Screening, type selecting processing：By step 2）In the obtained spheric granules drying and processing at 120 DEG C in vacuum drying chamber
60min, then screening and type selecting are carried out to spheric granules, wherein the standard for sieving spheric granules is the granularity 30/ of spheric granules
35, grain size difference is no more than ± 10%；It is that draw ratio is no more than 1.3 to the standard of spheric granules type selecting using diamond model selection machine.
4）Ordering treatment：By step 3）Treated, and spheric granules 210g is fitted into steel mold, and is fixed on electromagnetic vibration
In motivation, apply the sinusoidal vibration orthogonal each other of two horizontal directions, the amplitude of setting two direction of vibration of electromagnetic vibration machine is
Steel mold is then placed in cold moudling on hydraulic press, briquetting pressure by 1.0mm, frequency 380Hz, time of vibration 20min
90MPa obtains the grinding wheel green compact of diameter 120mm.
5）Sintering：By step 4）In obtained grinding wheel green compact be fitted into graphite jig, 780 DEG C of temperature on hot press, pressure
15min is sintered under the conditions of power 40MPa to get the skive arranged to ordering.
Comparative example 1
With embodiment 2 the difference is that omitting step（2）,（3）,（4）, remaining is executed by embodiment 2, i.e., directly takes step
（1）The mixed powder of quality 210g presses step after being packed into graphite jig（5）Technique sintering, obtain the unordered of same size size
Change the skive of arrangement.
Arrangement Contrast on effect of the diamond particles of comparative example 1 and embodiment 2 in grinding wheel is as shown in Figure 2.
Embodiment 2 and the grinding wheel of comparative example 1 are compared, the present embodiment realizes the uniform of diamond particles in grinding wheel
Ordering arranges, and diamond particles tend to random distribution in bonding agent in 1 grinding wheel of comparative example, and there are the poly- of diamond distribution
Ji Qu and rare area.
Embodiment 1, embodiment 2 and the skive of comparative example 1 are used for repairing for vitrified CBN wheel under the same conditions
It is whole, obtain data shown in table 1.
It uses the average finishing time and modifies number as the evaluation index of diamond wheel grinding efficiency before putting the first edge on a knife or a pair of scissors again,
Use it is accumulative finishing number as the skive service life evaluation index, from table 1 it follows that embodiment 1 and 2 phase of embodiment
34% and 29% has been respectively shortened than in comparative example 1, averagely modifying the time, the finishing number before putting the first edge on a knife or a pair of scissors again be increased to 30 times with
On, 73% and 108% has been respectively increased in accumulative finishing number, therefore, the mill for the ordered arrangement skive that the present embodiment obtains
It cuts efficiency and the service life is superior to disorderly arranged skive.
Embodiment 3
A kind of preparation method of ordering arrangement metal anchoring agent diamond wheel, includes the following steps：
1）Batch mixing：The RVD diamonds that 400g granularities are 120/140 are weighed, glycerol content 10% is added（Volume fraction）Ethyl alcohol it is molten
Uniform stirring after liquid 50mL, then in the copper and tin metallic bond powder that 2200g ingredients are 75%Cu+15%Sn+2%Ni+8%Co
Stearic acid content 2% is added（Volume fraction）Ethanol solution 70mL, by diamond and metallic bond powder in three-dimensional material mixer
In uniformly mix 120min after obtain mixed powder.
2）It is granulated：Mixed powder is granulated in GA240 type comminutors, sets rotary speed 70rpm, rolls granulation process
In, diamond particles gradually coat bonding agent powder, obtain spherical coated as core, bonding agent powder using diamond particles
Grain.
3）Screening, type selecting processing：By step 2）In the obtained spheric granules drying and processing at 120 DEG C in vacuum drying chamber
60min, then screening and type selecting are carried out to spheric granules, wherein the standard for sieving spheric granules is the granularity 60/ of spheric granules
70, grain size difference is no more than ± 10%；It is that draw ratio is no more than 1.3 to the standard of spheric granules type selecting using diamond model selection machine.
4）Ordering treatment：By step 3）Treated, and spheric granules 1800g is fitted into steel mold, and is fixed on electromagnetic vibration
In motivation, apply the sinusoidal vibration orthogonal each other of two horizontal directions, the amplitude of setting two direction of vibration of electromagnetic vibration machine is
Steel mold is then placed in cold moudling on hydraulic press, briquetting pressure by 0.7mm, frequency 450Hz, time of vibration 60min
90MPa obtains the grinding wheel green compact of diameter 250mm.
5）Sintering：By step 4）In obtained grinding wheel green compact be fitted into graphite jig, 730 DEG C of temperature on hot press, pressure
30min is sintered under the conditions of power 50MPa to get the skive arranged to ordering.
Comparative example 2
With embodiment 3 the difference is that omitting step（2）,（3）,（4）, remaining is executed by embodiment 3, i.e., directly takes step
（1）The mixed powder of quality 1800g presses step after being packed into graphite jig（5）Technique sintering, obtain the nothing of same size size
The skive of sequenceization arrangement.
Embodiment 3 and the grinding wheel of comparative example 2 are compared, the present embodiment realizes the uniform of diamond particles in grinding wheel
Ordering arranges, and diamond particles tend to random distribution in bonding agent in 2 grinding wheel of comparative example, and there are the poly- of diamond distribution
Ji Qu and rare area.
The skive of embodiment 3 and comparative example 2 is used for the flat surface grinding of hard alloy under the same conditions, is obtained
Data shown in table 2.
From Table 2, it can be seen that embodiment 3, compared to comparative example 2, grinding ratio improves 62%, and grinding power reduces
31%, workpiece surface roughness is consistent, therefore the grinding efficiency of ordered arrangement skive that the present embodiment obtains is better than unordered
Arrange skive.
The above is only the preferable implementation example of the present invention, is not intended to limit the present invention in any form.
Any technical person familiar with the field, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content makes many possible changes and modifications to technical solution of the present invention, or is revised as the equivalent of equivalent variations
Implement example.Therefore, every content without departing from technical solution of the present invention, according to the technical essence of the invention to implementing to show above
Any simple modifications, equivalents, and modifications done of example, in the range of still falling within technical solution of the present invention protection.
Claims (9)
1. a kind of preparation method of ordering arrangement metal anchoring agent diamond wheel, which is characterized in that include the following steps：
1）Batch mixing：Diamond, the ethanol solution of glycerine, metallic bond powder, stearic ethanol solution is taken to be mixed to get mixed
Close powder；
2）It is granulated：Mixed powder is rolled to the spherical shape for being granulated and obtaining being coated as core, metallic bond powder using diamond particles
Particle；
3）Screening, type selecting processing：Spheric granules is dried, then screening and type selecting are carried out to spheric granules；
4）Ordering treatment：Spheric granules after screening and type selecting is applied into sinusoidal vibration both horizontally and vertically, and is cold-pressed
Molding obtains grinding wheel green compact；
5）Sintering：The sintering of grinding wheel green compact is obtained into the skive of ordering arrangement.
2. the preparation method of ordering arrangement metal anchoring agent diamond wheel as described in claim 1, which is characterized in that described
Step 1）The concrete mode of middle raw material mixing is：It is added in a diamond after the ethanol solution 0.05-0.15ml/g of glycerine uniformly
Stirring, is added stearic ethanol solution 0.03-0.05ml/g, then by diamond and metal knot in metallic bond powder
Mixture powder obtains mixed powder after uniformly mixing 60-120min in three-dimensional material mixer；
Wherein, the content 10-15% of glycerine in ethanol, the content 2-5% of stearic acid in ethanol.
3. the preparation method of ordering arrangement metal anchoring agent diamond wheel as claimed in claim 2, which is characterized in that described
The granularity of a concentration of 100-200% of diamond in mixed powder, diamond are not less than 120/140；The metallic bond powder
For the copper and tin metallic bond of composition 75%Cu+15%Sn+2%Ni+8%Co.
4. the preparation method of ordering arrangement metal anchoring agent diamond wheel as described in claim 1, which is characterized in that described
Step 2）It is middle roll be granulated concrete mode be：Mixed powder is placed in comminutor and is granulated, set comminutor rotary speed as
70-120rpm。
5. the preparation method of ordering arrangement metal anchoring agent diamond wheel as described in claim 1, which is characterized in that described
Step 3）In, it is 1.2-1.8 times of diamond that the standard of spheric granules screening, which is the average grain diameter of spheric granules, and average grain diameter is poor
No more than ± 10%；The standard of spheric granules type selecting is that draw ratio is no more than 1.3.
6. the preparation method of ordering arrangement metal anchoring agent diamond wheel as described in claim 1, which is characterized in that described
Step 4）The method of middle ordering treatment is：Apply the sinusoidal vibration orthogonal each other of at least two horizontal directions and at most one hangs down
Histogram to sinusoidal vibration.
7. the preparation method of ordering arrangement metal anchoring agent diamond wheel as claimed in claim 6, which is characterized in that described
The amplitude of each direction sinusoidal vibration is 0.7-1.5mm, frequency 300-450Hz, time of vibration 40-60min.
8. the preparation method of ordering arrangement metal anchoring agent diamond wheel as described in claim 1, which is characterized in that described
Step 5）In, sintering method is：730-780 DEG C of temperature on hot press is sintered 10-30min under the conditions of pressure 40-50MPa.
9. obtaining ordering according to any preparation methods of claim 1-8 arranges metal anchoring agent diamond wheel.
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| CN201810472042.3A CN108724025B (en) | 2018-05-17 | 2018-05-17 | ordered arrangement metal bond diamond grinding wheel and preparation method thereof |
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|---|---|---|---|
| CN201810472042.3A CN108724025B (en) | 2018-05-17 | 2018-05-17 | ordered arrangement metal bond diamond grinding wheel and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120766C (en) * | 1997-04-04 | 2003-09-10 | 宋健民 | Brazed diamond tools by infiltration |
| KR100709393B1 (en) * | 2006-02-10 | 2007-04-20 | 이화다이아몬드공업 주식회사 | Manufacturing method of segments for cutting/polishing tool and manufacturing apparatus thereof |
| CN101745877A (en) * | 2009-12-16 | 2010-06-23 | 南京航空航天大学 | Diamond grinding material sequential arraying system and method |
| CN105415215A (en) * | 2015-11-06 | 2016-03-23 | 富耐克超硬材料股份有限公司 | Orderly arrangement method for superhard abrasives |
| CN106826587A (en) * | 2015-12-03 | 2017-06-13 | 台山市兰宝磨具有限公司 | A kind of skive and preparation method thereof |
-
2018
- 2018-05-17 CN CN201810472042.3A patent/CN108724025B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120766C (en) * | 1997-04-04 | 2003-09-10 | 宋健民 | Brazed diamond tools by infiltration |
| KR100709393B1 (en) * | 2006-02-10 | 2007-04-20 | 이화다이아몬드공업 주식회사 | Manufacturing method of segments for cutting/polishing tool and manufacturing apparatus thereof |
| CN101745877A (en) * | 2009-12-16 | 2010-06-23 | 南京航空航天大学 | Diamond grinding material sequential arraying system and method |
| CN105415215A (en) * | 2015-11-06 | 2016-03-23 | 富耐克超硬材料股份有限公司 | Orderly arrangement method for superhard abrasives |
| CN106826587A (en) * | 2015-12-03 | 2017-06-13 | 台山市兰宝磨具有限公司 | A kind of skive and preparation method thereof |
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