CN103496988B - Methods for oxidation treatment of CBN abrasive particle and for preparation of ceramic binder CBN grinding tool by using CBN abrasive particle - Google Patents
Methods for oxidation treatment of CBN abrasive particle and for preparation of ceramic binder CBN grinding tool by using CBN abrasive particle Download PDFInfo
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- CN103496988B CN103496988B CN201310398577.8A CN201310398577A CN103496988B CN 103496988 B CN103496988 B CN 103496988B CN 201310398577 A CN201310398577 A CN 201310398577A CN 103496988 B CN103496988 B CN 103496988B
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Abstract
The invention discloses methods for oxidation treatment of a CBN abrasive particle and for preparation of a ceramic binder CBN grinding tool by using the CBN abrasive particle. The methods are characterized in that a uniform and compact film is formed on the surface of the CBN abrasive particle with granularity of 70 to 150 mu m through oxidation treatment of the CBN abrasive particle at a temperature of 850 to 1050 DEG C, thereby improving bonding strength of glass powder on the CBN abrasive particle and enhancing bending strength and wear resistance of the ceramic binder CBN grinding tool. Compared with a CBN grinding tool prepared from an unoxidized CBN abrasive particle, the CBN grinding tool prepared from the CBN abrasive particle having undergone oxidation treatment has the following characteristics: a structure is uniform, bonding strength between a binder and the CBN abrasive particle is high, bending strength of the grinding tool is great, and high speed grinding requirements of the CBN grinding tool are met.
Description
Technical field
The present invention relates to abrasive material, grinding tool technology of preparing, particularly a kind of CBN(cubic boron nitride) grain surface treatment process, and prepared by the abrasive particle of this process to the method for Vitrified Bond CBN Tools.
Background technology
As grinding and grinding Vitrified Bond CBN Grinding Wheel, owing to having good rigidly, sharp keen degree is good, the advantages such as wear-resisting and easy finishing, because not with iron, the metal reactions such as aluminium, therefore in metal material processing field, such as various steel, metal titanium, the form grinding of the metal group material such as aluminium and various alloys thereof, the aspect such as precision work and surface finish receives widespread use, but the chemical property due to CBN abrasive material is inertia, therefore ceramic bond is lower to its wettability of the surface, the bonding force mainly mechanical bonding force on usual ceramic bond and its surface, therefore bonding force is more weak, its bending strength of emery wheel prepared with ceramic bond and untreated CBN abrasive particle is lower, easily produce larger Rotating stress at emery wheel center time removal rates is larger and cause emery wheel to rupture, CBN grinding tool high-speed grinding requirement cannot be met, limit the use of CBN abrasive material to a great extent, therefore the bonding force improving ceramic bond and CBN grain surface improves the key point of emery wheel bending strength and removal rates, is also the direction that Present Domestic is extensively studied outward.
Can make CBN grain surface uniform fold layer oxide film by carrying out conscious oxide treatment to CBN grain surface, the main component of this oxide film is B
2o
3, in ceramic bond and CBN abrasive particle cohesive process, CBN grain surface this layer of B
2o
3film can spread and dissolve in bonding agent, make to form firmly chemical binding force between bonding agent and CBN abrasive particle, CBN abrasive particle makes grain surface cutting edge rust because of surface oxidation treatment simultaneously, improve the mechanical bonding force between ceramic bond and CBN abrasive particle, further strengthen the bonding strength between ceramic bond and CBN abrasive particle; Simultaneously because the abrasive particle cutting edge of passivation makes CBN grinding tool reduce frictional coefficient between grinding tool and workpiece in Grinding Process, thus reduce the grinding heat produced in grinding process, burned work-surface in high-speed grinding process can be prevented.
Summary of the invention
The present invention is the problem that emery wheel bending strength prepared by solution traditional ceramics bonding agent and undressed CBN abrasive particle is low, provide a kind of technique simple, be oxidized uniform CBN grain surface treatment process, and provide a kind of CBN abrasive particle to this process adopt porous ceramics bonding agent to obtain flexural strength is high, homogeneous microstructure, sharpness good and have the CBN grinding tool preparation method of enough wear resistancies.
For reaching above object, the present invention takes following technical scheme to be achieved:
A kind of CBN abrasive particle oxidation processing technique, is characterized in that, comprise the steps:
(1) be that 70-150 μm of CBN abrasive particle is placed in corundum crucible and makes it be evenly distributed, pile up loose by granularity, crucible is placed in air furnace, is warming up to 850-1050 DEG C, insulation 10-150min, furnace cooling is to room temperature;
(2) take out in crucible the CBN abrasive particle be heat-treated, open with grinding machinery the adhesion that abrasive particle produces because of surface oxidation, obtain the CBN abrasive particle after oxide treatment.
In above-mentioned technique, the speed of described intensification is 3 DEG C/min.Described to be evenly distributed, to pile up and loosely refer to that CBN abrasive particle stacked area wants large, piling height is lower.
A kind of method preparing Vitrified Bond CBN Tools, it is characterized in that, by mass percentage, CBN abrasive particle prepared by 80% aforesaid oxidation processing technique with 20% Al-B-Si glass frit mix, be shaped, at 740 DEG C, carry out sintering obtain Vitrified Bond CBN Tools, wherein, described glass powder average particle size is 30 μm.Described glass powder by mass percentage, comprises following composition: SiO
265%, B
2o
312.5%, Al
2o
310%, Na
2o7%, Li
2o3%, ZnO1%, CaO1%, MgO0.5%.
The invention has the beneficial effects as follows:
1, the present invention still has relatively sharp cutting blade after CBN grain surface oxide treatment, CBN grinding tool (emery wheel) sintering temperature obtained after abrasive particle oxide treatment is low, microtexture is even, by selecting suitable CBN wear particle size, oxidation temperature and oxidation treatment time, thus make CBN emery wheel have higher physical strength, good cutting power and higher grinding efficiency.
2, stronger Chemical bond can be formed between the CBN abrasive particle after oxide treatment and porous ceramics bonding agent, simultaneously because the rear relative rust of cutting edge of CBN grain surface oxidation, thus further increase the mechanical bonding force of ceramic bond to its surface, improve grinding tool bending strength; Due to the CBN abrasive particle cutting edge rust after oxide treatment, therefore significantly can reduce the frictional coefficient between abrasive particle and workpiece in high-speed grinding process, reduce the grinding heat in grinding process, avoid workpiece and burnt, meet the requirement of high-speed grinding, and have enough wear resistancies.
3, this CBN grain surface oxidation processing technique is pollution-free, toxicological harmless, energy-conserving and environment-protective.
Embodiment
The present invention adopt granularity be 70-150 μm of CBN abrasive particle as processed abrasive material, at 850-1050 DEG C, oxide treatment 10-150min in air atmosphere, while ensureing that abrasive particle has enough sharp cutting edge, the B of covering one deck densification of surface uniform
2o
3film.Treatment temp is lower than 800 DEG C, and oxide thickness is not enough, falls flat, and treatment temp is higher than 1100 °, and CBN particulate oxidation is serious, reduces the grinding effect of CBN particle.CBN abrasive particle after oxide treatment, after carefully the grain surface adhesion produced because of surface oxidation in abrasive particle oxidising process is opened in grinding, obtains the CBN abrasive particle after processing.
By mass percentage, the CBN abrasive particle after above-mentioned 80% oxide treatment is mixed with 20% glass powder, sinters at 740 DEG C after shaping, the Vitrified Bond CBN Tools prepared.Wherein, glass powder is the Al-B-Si glass frit end of mean particle size 30 μm, and its composition (mass percent) is: SiO
265%, B
2o
312.5%, Al
2o
310%, Na
2o7%, Li
2o3%, ZnO1%, CaO1%, MgO0.5%.
The concrete oxidation processing technique parameter of CBN abrasive particle of the present invention refers to table 1.
Table 1
| Granularity (μm) | Oxidizing temperature (DEG C) | Oxidization time (min) | |
| Embodiment 1 | 70 | 850 | 60 |
| Embodiment 2 | 70 | 950 | 150 |
| Embodiment 3 | 120 | 1050 | 30 |
| Embodiment 4 | 120 | 950 | 60 |
| Embodiment 5 | 150 | 900 | 120 |
| Embodiment 6 | 150 | 1050 | 10 |
| Comparative example 1 | 70 | Be not oxidized | |
| Comparative example 2 | 120 | Be not oxidized | |
| Comparative example 3 | 150 | Be not oxidized |
For embodiment 4, the specific implementation process of CBN grain surface oxidizing process of the present invention is:
By 120 μm of CBN abrasive particles, be placed in corundum crucible, and rock crucible and make it be evenly distributed, pile up loose, specific requirement is that stacked area is wanted (be greater than 100cm greatly
2), piling height lower (being less than 5mm), makes abrasive particle be heated evenly, and grain surface oxidation is fully.Crucible is placed in high temperature air stove, rise to 950 DEG C with the temperature rise rate of 3 DEG C/min and after being incubated 60min furnace cooling to room temperature; CBN abrasive particle good for thermal treatment is poured into also carefully grinding in mortar, the fully oxidized CBN abrasive particle in obtained surface is opened in the CBN grain surface adhesion making it cause because of oxidation.
By the abrasive particle 80% after oxidation with glass powder 20%(mass percent) mix, cold isostatic compaction, finally in 740 DEG C of sintering, obtain containing the CBN emery wheel of ceramic bond.
The grinding tool that in table 1, embodiment 1 ~ 6 is prepared through the CBN abrasive particle of surface oxidation treatment, carries out mechanical property (void content, bending strength) test, the results detailed in Table 2.In order to further illustrate beneficial effect of the present invention, by comparative example 1 ~ 3 without surface oxidation CBN abrasive particle prepared by grinding tool (grinding tool that method is prepared with the CBN abrasive particle of surface oxidation treatment) also carried out corresponding Mechanics Performance Testing, result can see table 2.
Table 2
| Total porosity (%) | Ventilate rate (%) | Bending strength (MPa) | The improvement (%) of intensity | |
| Embodiment 1 | 21.3 | 19.8 | 79.1 | 5.33 |
| Embodiment 2 | 20.1 | 19.3 | 87.1 | 15.98 |
| Embodiment 3 | 26.1 | 25.2 | 72.1 | 13.72 |
| Embodiment 4 | 26.9 | 24.2 | 77.5 | 22.24 |
| Embodiment 5 | 27.3 | 25.8 | 56.6 | 24.94 |
| Embodiment 6 | 26.8 | 24.2 | 52.3 | 15.45 |
| Comparative example 1 | 21.3 | 19.8 | 75.1 | |
| Comparative example 2 | 26.3 | 24.6 | 63.4 | |
| Comparative example 3 | 26.8 | 25.3 | 45.3 |
As can be seen from Table 2, its bending strength of grinding tool prepared without snperoxiaized CBN abrasive particle is 45-75MPa, and reaches 52-87MPa through its bending strength of grinding tool prepared by snperoxiaized CBN abrasive particle, improves 15-20%.Especially the grinding tool prepared through the CBN abrasive particle of oxide treatment of embodiment 4, total porosity is 26.9%, and bending strength is 77.5MPa, and grinding tool total porosity prepared by the unoxidized CBN abrasive particle of comparative example 2 is 26.3%, and bending strength is 63.4MPa.The total porosity of the two is close, but bending strength improves 22%, meets CBN grinding tool high-speed grinding requirement.
Claims (3)
1. a CBN abrasive particle oxidation processing technique, is characterized in that, comprises the steps:
(1) by granularity be 70-150 μm of CBN abrasive particle be placed in corundum crucible make it be evenly distributed, pile up loose, namely CBN abrasive particle stacked area wants large, piling height is lower, crucible is placed in air furnace, be warming up to 850-1050 DEG C, temperature rise rate is 3 DEG C/min, insulation 10-150min, and furnace cooling is to room temperature;
(2) take out in crucible the CBN abrasive particle be heat-treated, open with grinding machinery the adhesion that abrasive particle produces because of surface oxidation, obtain the CBN abrasive particle after oxide treatment.
2. prepare the method for Vitrified Bond CBN Tools for one kind, it is characterized in that, by mass percentage, CBN abrasive particle prepared by 80% oxidation processing technique according to claim 1 with 20% Al-B-Si glass frit mix, be shaped, at 740 DEG C, carry out sintering obtain Vitrified Bond CBN Tools; Wherein, Al-B-Si glass frit by mass percentage, comprises following composition: SiO
265%, B
2o
312.5%, Al
2o
310%, Na
2o7%, Li
2o 3%, ZnO1%, CaO1%, MgO0.5%.
3. prepare the method for Vitrified Bond CBN Tools as claimed in claim 2, it is characterized in that, the average particle size of described glass powder is 30 μm.
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|---|---|---|---|
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| CN201310398577.8A CN103496988B (en) | 2013-09-04 | 2013-09-04 | Methods for oxidation treatment of CBN abrasive particle and for preparation of ceramic binder CBN grinding tool by using CBN abrasive particle |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1205262A (en) * | 1998-07-24 | 1999-01-20 | 中国科学院上海硅酸盐研究所 | Ultrahard compounded tool, its prepn. method and application |
| CN1359322A (en) * | 1999-07-09 | 2002-07-17 | 3M创新有限公司 | Metal bond abrasive article comprising porous ceramic abrasive composites and method of using same to abrade a workpiece |
| CN103240683A (en) * | 2013-04-23 | 2013-08-14 | 天津大学 | Ceramic-metal compound bond for cubic boron nitride grinding wheels |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1205262A (en) * | 1998-07-24 | 1999-01-20 | 中国科学院上海硅酸盐研究所 | Ultrahard compounded tool, its prepn. method and application |
| CN1359322A (en) * | 1999-07-09 | 2002-07-17 | 3M创新有限公司 | Metal bond abrasive article comprising porous ceramic abrasive composites and method of using same to abrade a workpiece |
| CN103240683A (en) * | 2013-04-23 | 2013-08-14 | 天津大学 | Ceramic-metal compound bond for cubic boron nitride grinding wheels |
Non-Patent Citations (1)
| Title |
|---|
| 不同颜色立方氮化硼的合成及耐热性的研究;张铁臣等;《高压物理学报》;19901231;第1卷(第4期);270-275 * |
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