CN103570350B - Preparation method of CBN ceramic high-speed grinding wheel used for high-speed grinding of air valve of internal combustion locomotive - Google Patents
Preparation method of CBN ceramic high-speed grinding wheel used for high-speed grinding of air valve of internal combustion locomotive Download PDFInfo
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- CN103570350B CN103570350B CN201210258299.1A CN201210258299A CN103570350B CN 103570350 B CN103570350 B CN 103570350B CN 201210258299 A CN201210258299 A CN 201210258299A CN 103570350 B CN103570350 B CN 103570350B
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Abstract
The invention discloses a preparation method of a CBN ceramic high-speed grinding wheel used for high-speed grinding of an air valve of an internal combustion locomotive. Pre-melting ceramic powder is prepared from following components by weight: 25-33 of Al2O3, 40-48 of SiO2, 3-4 of Na2O, 1-1.5 of MgO, 4-5 of K2O and 8-9 of B2O3. A binding agent is prepared by sintering 1 part of nanoscale titanium dioxide and 9 parts of the pre-melting ceramic powder according to a preset temperature curve. The firing temperature of the ceramic binding agent is 730 DEG C, but the breaking strength of the ceramic binding agent can reach 110 MPa. At the temperature, the CBN strength has nearly no loss and cutting edge angles are clear, thus largely improving machinability of the CBN grinding wheel.
Description
Technical field:
The present invention relates to field of electromechanical equipment, specifically a kind of CBN ceramic high speed grinding wheel preparation method, is more specifically a kind of CBN ceramic high speed grinding wheel preparation method for the high-speed grinding of train diesel locomotive air valve.
Background technology:
Diesel locomotive air valve belongs to extremely difficult grinding work piece, domestic this workpiece of grinding all the time CBN emery wheel is German import always, even if but import emery wheel stability in the course of processing, workpiece surface quality also with require certain gap, for this kind of situation, in the urgent need to a kind of CBN ceramic high speed emery wheel for the high-speed grinding of train diesel locomotive air valve.
CBN vitrified grinding wheel is primarily of steel matrix and working abrasive layer two portions composition, working abrasive layer main component is ceramic bond and CBN, traditional C BN ceramic bond firing temperature is generally 900 ﹏ 950 DEG C, the general 75MPa of folding strength, CBN loss of strength about 10% at this temperature, and CBN abrasive material sharp corner passivation.Ceramic bond intensity is larger, and the crushing cycle is longer, and the life-span is higher; In addition, CBN wedge angle and intensity also affect emery wheel stock-removing efficiency.
Summary of the invention:
For improving emery wheel overall performance, the invention provides a kind of Low-temperature vitrified bond CBN high speed grinding wheel technology of preparing.Ceramic bond firing temperature is 730 DEG C, but folding strength can reach 110MPa, and at this temperature, CBN intensity is not lost substantially, cuts corner angle clearly demarcated, substantially increases CBN emery wheel cutting ability.
Concrete technical scheme is:
One, bonding agent preparation
1, the preparation of fritting ceramics powder:
A. preparation fritting ceramics powder is followed these steps to: take analytical pure raw material A l by weight
2o
325-33, SiO
240-48, Na
2o 3-4, MgO 1-1.5, K
2o 4-5, B
2o
38-9, then mixes;
B. high temperature burns till 1400 degree;
C. 500 mesh standard sieves are crossed in fragmentation;
D. undersize powder is dried, and gained powder is fritting ceramics powder;
2, the mixed system of bonding agent
Take 1 part of Nano titanium dioxide and 9 parts of fritting ceramics powders by quality, mix with ball mill ball milling, resulting product is bonding agent;
Two, vitrified CBN wheel grinding working lining preparation
Grinding working layer is taken: bonding agent 35, alumina hollow ball 7, CBN58 by following volume ratio, even by weighing up mixing of materials above;
Middle transition layer material is taken: bonding agent 35,150 order Ceramic Balls 65 of heatproof 1350 DEG C by following volume ratio, even by weighing up mixing of materials above;
The above-mentioned ceramic CBN sand milling mixed is cut working lining and intermediate layer adds carboxymethyl cellulose aqueous solution respectively, be pressed into solid shape, dry laggard High Temperature Furnaces Heating Apparatus sintering;
Three, vitrified CBN wheel working lining high temperature sintering
The sintering temperature of vitrified CBN wheel and sintering time are: first paragraph 20 DEG C 50 minutes, second segment 100 DEG C 50 minutes, 3rd section 300 DEG C 100 minutes, 4th section 600 DEG C 10 minutes, 5th section 600 DEG C 10 minutes, 6th section 780 DEG C 15 minutes, the 7th section 780 DEG C 150 minutes, the 8th section 20 DEG C >=300 minutes;
Nitrogen protection baking modes is taked in vitrified CBN wheel working lining high-temperature sintering process.
Advantage of the present invention: have following characteristics in formula: A, bonding agent firing temperature are low, and High anti bending strength is good to abrasive material cohesiveness; Adding of B, fritting ceramics powder reduces bonding agent firing temperature, and improves the wettability of bonding agent to abrasive material; The introducing of C, nano material substantially increases parcel ability, the intensity of bonding agent to abrasive material, and reduces the sintering temperature of stone layer and intermediate layer.In firing process, feature is as follows: A, ceramic working lining sintering temperature adopt program controlled mode; temperature and time is precisely controlled under the control of digital display temperature control table; thus ensure that product reaches design requirements; B, take same nitrogen protection baking modes; ensure that CBN intensity does not change, surface is without scaling loss.
Embodiment
The present invention is further illustrated below in conjunction with specific embodiment.
Embodiment 1
One, bonding agent preparation
1, fritting ceramics powder
Take the pure raw material of table 1 composition analysis → mix → high temperature by weight to burn till 1400 degree → water-cooled → fragmentation and cross 500 mesh standard sieves → undersize powder and dry;
Gained powder is fritting ceramics powder.
2, the mixed system of bonding agent
Take a nano material titanium dioxide+nine parts of fritting ceramics powders by quality, mix with ball mill ball milling, resulting product is bonding agent.
Table 1
| Al 2O 3 | SiO 2 | Na 2O | MgO | K 2O | B 2O 3 |
| 33 | 40 | 3 | 1 | 4 | 9 |
Two, vitrified CBN wheel grinding working lining preparation
Take table 2 grinding working lining by volume
Table 2:
| Item Title | Ratio (volume ratio) % |
| Bonding agent | 35 |
| Alumina hollow ball | 7 |
| CBN | 58 |
Take table 3 intermediate layer by volume:
Intermediate layer is one deck stupalith of stone layer and grinding wheel base body centre, plays over-effect.
Table 3:
| Item Title | Ratio (volume ratio) % |
| Bonding agent | 35 |
| 150 order Ceramic Balls (heatproof 1350 DEG C) | 65 |
Mixing of materials will be weighed up even.
Formula feature:
Bonding agent firing temperature is low, High anti bending strength, good to abrasive material cohesiveness;
Adding of fritting ceramics powder reduces bonding agent firing temperature, and improves the wettability of bonding agent to abrasive material;
The introducing of nano material substantially increases parcel ability, the intensity of bonding agent to abrasive material, and reduces the sintering temperature of stone layer and intermediate layer.
The grinding working lining mixed and intermediate layer are added carboxymethyl cellulose aqueous solution respectively, is pressed into solid shape, dry laggard High Temperature Furnaces Heating Apparatus sintering.
Firing process feature:
Pottery working lining sintering temperature curve adopts program controlled mode, according to ceramic product high temperature sintering singularity, the invention provides a kind of sintering temperature curve of applicable vitrified CBN wheel, in table 4; Within the scope of differing temps, temperature rise rate is also had any different, and temperature curve is precisely controlled under the control of digital display temperature control table, and sinter machine can adopt the product of Luoyang Chun Peng Machinery Manufacturing Co., Ltd..
Take same nitrogen protection baking modes in vitrified CBN wheel working lining high-temperature sintering process, ensure that CBN intensity does not change, surface is without scaling loss.
Table 4
Embodiment 2
Embodiment 2 and the difference of embodiment 1 are only the material weight of table 1 than different, in table 5;
Table 5
| Al 2O 3 | SiO 2 | Na 2O | MgO | K 2O | B 2O 3 |
| 25 | 48 | 4 | 1.5 | 5 | 8 |
Table 6 is processed like product parameter for the embodiment of the present invention 1 and Japanese Toyota ten thousand grinding abrasive disk and is compared:
Table 6
Claims (2)
1., for a CBN ceramic high speed grinding wheel preparation method for diesel locomotive air valve high-speed grinding, it is characterized in that preparing according to following method:
One, bonding agent preparation
1, the preparation of fritting ceramics powder:
A. preparation fritting ceramics powder is followed these steps to: take analytical pure raw material A l by weight
2o
325-33, SiO
240-48, Na
2o 3-4, MgO 1-1.5, K
2o 4-5, B
2o
38-9, then mixes;
B. high temperature burns till 1400 degree;
C. 500 mesh standard sieves are crossed in fragmentation;
D. undersize powder is dried, and gained powder is fritting ceramics powder;
2, the mixed system of bonding agent
Take 1 part of Nano titanium dioxide and 9 parts of fritting ceramics powders by quality, mix with ball mill ball milling, resulting product is bonding agent;
Two, vitrified CBN wheel grinding working lining preparation
Grinding working layer is taken: bonding agent 35, alumina hollow ball 7, CBN58 by following volume ratio, even by weighing up mixing of materials above;
Middle transition layer material is taken: bonding agent 35,150 order Ceramic Balls 65 of heatproof 1350 DEG C by following volume ratio, even by weighing up mixing of materials above;
The above-mentioned ceramic CBN sand milling mixed is cut working lining and intermediate layer adds carboxymethyl cellulose aqueous solution respectively, be pressed into solid shape, dry laggard High Temperature Furnaces Heating Apparatus sintering;
Three, vitrified CBN wheel working lining high temperature sintering
The sintering temperature of vitrified CBN wheel and sintering time are: first paragraph 20 DEG C 50 minutes, second segment 100 DEG C 50 minutes, 3rd section 300 DEG C 100 minutes, 4th section 600 DEG C 10 minutes, 5th section 600 DEG C 10 minutes, 6th section 780 DEG C 15 minutes, the 7th section 780 DEG C 150 minutes, the 8th section 20 DEG C >=300 minutes.
2. method according to claim 1, is characterized in that: in vitrified CBN wheel working lining high-temperature sintering process, take nitrogen protection baking modes.
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| CN201210258299.1A CN103570350B (en) | 2012-07-24 | 2012-07-24 | Preparation method of CBN ceramic high-speed grinding wheel used for high-speed grinding of air valve of internal combustion locomotive |
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| CN103570350B true CN103570350B (en) | 2015-04-01 |
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| CN107971937A (en) * | 2017-12-25 | 2018-05-01 | 沈阳中科超硬磨具磨削研究所 | A kind of vitrified CBN wheel bonding agent for harmonic reducer of robot |
| CN111331526B (en) * | 2020-03-25 | 2021-05-25 | 中北大学 | Graphene oxide toughened ceramic bond CBN grinding wheel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168244A (en) * | 2007-11-22 | 2008-04-30 | 天津大学 | Ceramic bonding agent cubic boron nitride grinding wheel applied for camshaft grinding processing |
| CN102009393A (en) * | 2009-09-04 | 2011-04-13 | 沈阳中科超硬磨具磨削研究所 | Preparation technology of high-speed grinding CBN (Cubic Boron Nitride) ceramic grinding wheel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168244A (en) * | 2007-11-22 | 2008-04-30 | 天津大学 | Ceramic bonding agent cubic boron nitride grinding wheel applied for camshaft grinding processing |
| CN102009393A (en) * | 2009-09-04 | 2011-04-13 | 沈阳中科超硬磨具磨削研究所 | Preparation technology of high-speed grinding CBN (Cubic Boron Nitride) ceramic grinding wheel |
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