CN102815946B - Cubic boron nitride (CBN) ceramic high speed grinding wheel and preparation method and application - Google Patents
Cubic boron nitride (CBN) ceramic high speed grinding wheel and preparation method and application Download PDFInfo
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Abstract
The invention discloses a cubic boron nitride (CBN) ceramic high speed grinding wheel which comprises a steel substrate and a working abrasive layer. The working abrasive layer comprises an abrasive layer and a middle transition layer. The abrasive layer comprises the following materials: low temperature binding agent, white corundum, ceramic floating bead and CBN. The middle transition layer comprises the following materials: low temperature binding agent and 150-mesh ceramic balls. The low temperature binding agent includes the following materials by volume: 8-12 parts of nanoscale aluminumoxide, 8-12 parts of nanoscale silica and 75-85 parts of premelting ceramic powder. The premelting ceramic powder includes the following materials by volume: 25-35 parts of aluminum oxide, 27-37 parts of silica, 4.5-5.5 parts of sodium oxide, 1.5-2.5 parts of potassium oxide, 1.5-2.5 parts of magnesium oxide, 0.8 part to 1.2 parts of calcium oxide and 5-11 parts of diboron trioxide. The CBN ceramic high speed grinding wheel has the advantages that firing temperature of the ceramic binding agent is 750 DEG C, rupture strength can reach 115MPa, and the CBN strength is basically not lost under the temperature, so that cutting performance of the CBN grinding wheel is greatly improved. A preparation method and the application of the CBN ceramic high speed grinding wheel are further provided.
Description
Technical field
The present invention relates to the mechanical means field, is the ceramic high speed grinding wheel of a kind of CBN (cubic boron nitride) specifically, more specifically is a kind of CBN pottery high speed grinding wheel and preparation method for the high-speed grinding of energy-conservation high-grade automobile crane connecting rod neck.
Background technology
Because rise of the oil price, material cost rising, appreciation of the RMB and country are to influence of various factors such as the various preferential policies of energy-saving automobile, market is more and more higher to the cry of environmental protection, energy-conservation new power vehicle.This just requires the performance of motor car engine more and more better, the measure of precision of processing as the camshaft bent axle of engine important spare part directly influences the engine energy-saving effect, domestic at present for also not having forming technique in this respect, press for to develop a kind of precision sizing high speed CBN emery wheel for high-grade energy-saving engine bent axle.
The CBN vitrified grinding wheel mainly is made up of steel matrix and work abrasive material two portions, work abrasive material main component is ceramic bond and CBN, traditional C BN ceramic bond firing temperature is generally 900__950 ℃, folding strength is generally 75MPa, the CBN loss of strength about 10% under this temperature, and the passivation of CBN abrasive material wedge angle.Ceramic bond intensity is more big, and the crushing cycle is more long, and the life-span is more high.CBN wedge angle and intensity influence the emery wheel stock-removing efficiency.
Summary of the invention
For improving the emery wheel overall performance, the invention provides a kind of low-temp ceramics wedding agent CBN high speed grinding wheel, the ceramic bond firing temperature is 750 ℃, but folding strength can reach 115MPa, CBN intensity is not lost substantially under this temperature, and it is clearly demarcated to cut corner angle, has improved CBN emery wheel cutting ability greatly.Concrete scheme is as follows:
A kind of CBN pottery high speed grinding wheel comprises steel matrix and work abrasive material, and described work abrasive material comprises abrasive material and intermediate layer, and the material of described abrasive material is by volume: low-temperature binder 33-37, and white fused alumina 7-9, pottery float pearl 6-8, CBN45-55; The material of described intermediate layer is by volume:: low-temperature binder 30-40,150 order Ceramic Balls 55-75; The material of described low-temperature binder is by volume: nano level aluminium sesquioxide 8-12, nanometer grade silica 8-12, fritting ceramics powder 75-85; The material of described fritting ceramics powder is by volume:: aluminium sesquioxide 25-35, silicon-dioxide 27-37, sodium oxide 4.5-5.5, potassium oxide 1.5-2.5, magnesium oxide 1.5-2.5, calcium oxide 0.8-1.2, boron trioxide 5-11;
1350 ℃ of described 150 order Ceramic Balls heatproofs;
The present invention also discloses a kind of preparation method of described CBN pottery high speed grinding wheel, prepares as follows:
One, low-temperature binder preparation
(1) preparation of fritting ceramics powder:
By material be by volume:: aluminium sesquioxide 25-35, silicon-dioxide 27-37, sodium oxide 4.5-5.5, potassium oxide 1.5-2.5, magnesium oxide 1.5-2.5, calcium oxide 0.8-1.2, after boron trioxide 5-11 mixes raw material, burn till through the insulation in 2 hours of 1600 degree, water-cooled, fragmentation, 240 standard sieves, undersize powder, oven dry excessively make the fritting ceramics powder again;
(2) preparation of low-temperature binder:
By material be by volume:: nano level aluminium sesquioxide 8-12, nanometer grade silica 8-12, fritting ceramics powder 75-85 mixes raw material, mixes through ball milling, and resulting product is low-temperature binder;
Two, the preparation of work abrasive material:
Take by weighing the abrasive material material by volume: low-temperature binder 33-37, white fused alumina 7-9, pottery floats pearl 6-8, CBN45-55, take by weighing the middle transition layer material by volume: low-temperature binder 30-40,150 order Ceramic Balls 55-75, be arranged on matrix on by universal method above-mentioned materials after, temperature curve sintering by setting makes finished product; Described temperature curve is: 20 ℃ were warming up to 150 ℃ through 2 hours, were warming up to 500 ℃ through 3 hours again, were warming up to 750 ℃ through 3 hours again, last 750 ℃ of insulations 6 hours; In sintering process, adopt protection of inert gas;
The present invention also discloses a kind of application of described CBN pottery high speed grinding wheel: described CBN pottery high speed grinding wheel is applied to processing automobile engine crankshaft connecting rod neck.
The characteristics of material prescription of the present invention:
A, wedding agent firing temperature are low, and the folding strength height is good to abrasive material cohesiveness;
The adding of B, high temperature fritting pottery has reduced the wedding agent firing temperature, and has improved the wettability of wedding agent to abrasive material;
Add an amount of diamond in C, the CBN pottery working lining, can improve abrasive grain cutting efficient to a certain extent, and can reduce cost;
The introducing of D, nano material has improved parcel ability, intensity, the sintering temperature of wedding agent to abrasive material greatly.
The material that mixes is added the polyethylene aqueous solution, be pressed into solid shape, dry laggard High Temperature Furnaces Heating Apparatus sintering.
Preparation method's of the present invention process characteristic:
A, ceramic working lining sintering temperature are pressed the specified temp curve, according to ceramic product high temperature sintering singularity, the invention discloses the sintering temperature curve that is fit to ceramic CBN emery wheel, temperature rise rate is also had any different in the differing temps scope, temperature curve is precisely controlled under the control of digital display temperature control table, thereby guarantees that product accomplishes the end in view.
Take with protection of inert gas roasting mode in B, the ceramic CBN emery wheel working lining high-temperature sintering process, guarantee that CBN intensity does not change, the no scaling loss in surface.
Embodiment
Embodiment 1
One, low-temperature binder preparation
1, the preparation of fritting ceramics powder:
Press material mixture ratio and be (by volume): aluminium sesquioxide 25, silicon-dioxide 32, sodium oxide 5.5, potassium oxide 1.5, magnesium oxide 2, calcium oxide 1.2, after boron trioxide 5 mixes raw material, burn till through the insulation in 2 hours of 1600 degree, water-cooled, fragmentation, 240 standard sieves, undersize powder, oven dry excessively make the fritting ceramics powder again;
2, the preparation of low-temperature binder:
Press material mixture ratio and be (by volume): nano level aluminium sesquioxide 8, nanometer grade silica 10, fritting ceramics powder 85 mixes raw material, mixes through ball milling, and resulting product is low-temperature binder;
Two, the preparation of work abrasive material:
Take by weighing abrasive material (by volume) by following proportioning: low-temperature binder 33, white fused alumina 8, pottery floats pearl 8, CBN45, take by weighing intermediate layer (by volume) by following proportioning: low-temperature binder 30,150 order Ceramic Balls 60, be arranged on matrix on by universal method above-mentioned materials after, temperature curve sintering by setting makes finished product; Described temperature curve is: 20 ℃ were warming up to 150 ℃ through 2 hours, were warming up to 500 ℃ through 3 hours again, were warming up to 750 ℃ through 3 hours again, last 750 ℃ of insulations 6 hours; In sintering process, adopt the neon protection.
Embodiment 2
One, low-temperature binder preparation
1, the preparation of fritting ceramics powder:
Press material mixture ratio and be (by volume): aluminium sesquioxide 35, silicon-dioxide 37, sodium oxide 4.5, potassium oxide 2.5, magnesium oxide 2.5, calcium oxide 0.8, after boron trioxide 11 mixes raw material, burn till through the insulation in 2 hours of 1600 degree, water-cooled, fragmentation, 240 standard sieves, undersize powder, oven dry excessively make the fritting ceramics powder again;
2, the preparation of low-temperature binder:
Press material mixture ratio and be (by volume): nano level aluminium sesquioxide 12, nanometer grade silica 12, fritting ceramics powder 75 mixes raw material, mixes through ball milling, and resulting product is low-temperature binder;
Two, the preparation of work abrasive material:
Take by weighing abrasive material (by volume) by following proportioning: low-temperature binder 37, white fused alumina 9, pottery floats pearl 6, CBN55, take by weighing intermediate layer (by volume) by following proportioning: low-temperature binder 40,150 order Ceramic Balls 75, be arranged on matrix on by universal method above-mentioned materials after, temperature curve sintering by setting makes finished product; Described temperature curve is: 20 ℃ were warming up to 150 ℃ through 2 hours, were warming up to 500 ℃ through 3 hours again, were warming up to 750 ℃ through 3 hours again, last 750 ℃ of insulations 6 hours; In sintering process, adopt argon shield.
Embodiment 3
One, low-temperature binder preparation
1, the preparation of fritting ceramics powder:
Press material mixture ratio and be (by volume): aluminium sesquioxide 30, silicon-dioxide 27, sodium oxide 5, potassium oxide 2, magnesium oxide 1.5, calcium oxide 1, boron trioxide 8 after the raw material mixing, burns till through the insulation in 2 hours of 1600 degree, water-cooled, fragmentation, 240 standard sieves, undersize powder, oven dry excessively make the fritting ceramics powder again;
2, the preparation of low-temperature binder:
Press material mixture ratio and be (by volume): nano level aluminium sesquioxide 10, nanometer grade silica 8, fritting ceramics powder 80 mixes raw material, mixes through ball milling, and resulting product is low-temperature binder;
Two, the preparation of work abrasive material:
Take by weighing abrasive material (by volume) by following proportioning: low-temperature binder 35, white fused alumina 7, pottery floats pearl 7, CBN50, take by weighing intermediate layer (by volume) by following proportioning: low-temperature binder 35,150 order Ceramic Balls 55, be arranged on matrix on by universal method above-mentioned materials after, temperature curve sintering by setting makes finished product; Described temperature curve is: 20 ℃ were warming up to 150 ℃ through 2 hours, were warming up to 500 ℃ through 3 hours again, were warming up to 750 ℃ through 3 hours again, last 750 ℃ of insulations 6 hours; In sintering process, adopt the helium protection.
Table 1 is that CBN pottery high speed grinding wheel of the present invention and Japanese Toyota ten thousand grinding abrasive disks processing like product parameter compare:
Table 1
Claims (3)
1. a CBN pottery high speed grinding wheel comprises steel matrix and work abrasive material, and it is characterized in that: described work abrasive material comprises abrasive material and intermediate layer, the material of described abrasive material is by volume: low-temperature binder 33-37, white fused alumina 7-9, pottery float pearl 6-8, CBN45-55; The material of described intermediate layer is by volume:: low-temperature binder 30-40,150 order Ceramic Balls 55-75; The material of described low-temperature binder is by volume: nano level aluminium sesquioxide 8-12, nanometer grade silica 8-12, fritting ceramics powder 75-85; The material of described fritting ceramics powder is by volume:: aluminium sesquioxide 25-35, silicon-dioxide 27-37, sodium oxide 4.5-5.5, potassium oxide 1.5-2.5, magnesium oxide 1.5-2.5, calcium oxide 0.8-1.2, boron trioxide 5-11.
2. CBN pottery high speed grinding wheel according to claim 1 is characterized in that: 1350 ℃ of described 150 order Ceramic Balls heatproofs.
3. the preparation method of the described CBN pottery of a claim 1 high speed grinding wheel is characterized in that preparing as follows:
One, low-temperature binder preparation
(1) preparation of fritting ceramics powder:
By material be by volume:: aluminium sesquioxide 25-35, silicon-dioxide 27-37, sodium oxide 4.5-5.5, potassium oxide 1.5-2.5, magnesium oxide 1.5-2.5, calcium oxide 0.8-1.2, after boron trioxide 5-11 mixes raw material, burn till through the insulation in 2 hours of 1600 degree, water-cooled, fragmentation, 240 standard sieves, undersize powder, oven dry excessively make the fritting ceramics powder again;
(2) preparation of low-temperature binder:
By material be by volume:: nano level aluminium sesquioxide 8-12, nanometer grade silica 8-12, fritting ceramics powder 75-85 mixes raw material, mixes through ball milling, and resulting product is low-temperature binder;
Two, the preparation of work abrasive material:
Take by weighing the abrasive material material by volume: low-temperature binder 33-37, white fused alumina 7-9, pottery floats pearl 6-8, CBN45-55, take by weighing the middle transition layer material by volume: low-temperature binder 30-40,150 order Ceramic Balls 55-75, be arranged on matrix on by universal method above-mentioned materials after, temperature curve sintering by setting makes finished product; Described temperature curve is: 20 ℃ were warming up to 150 ℃ through 2 hours, were warming up to 500 ℃ through 3 hours again, were warming up to 750 ℃ through 3 hours again, last 750 ℃ of insulations 6 hours; In sintering process, adopt protection of inert gas.
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Cited By (1)
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| CN103831738A (en) * | 2014-02-11 | 2014-06-04 | 当涂县南方红月磨具磨料有限公司 | Cubic boron nitride grinding wheel containing surface active agent |
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| CN103894940A (en) * | 2014-01-10 | 2014-07-02 | 当涂县南方红月磨具磨料有限公司 | Ceramic brown corundum grinding wheel containing expanded perlite |
| CN103831739A (en) * | 2014-02-11 | 2014-06-04 | 当涂县南方红月磨具磨料有限公司 | High-temperature-resistant ceramic silicon carbide grinding wheel |
| CN103831741A (en) * | 2014-02-11 | 2014-06-04 | 当涂县南方红月磨具磨料有限公司 | Ceramic and cubic boron nitride grinding wheel containing active carbon |
| CN107805075A (en) * | 2017-10-24 | 2018-03-16 | 鹤山市旭威金刚石制品有限公司 | A kind of preparation method of vitrified bond and skive |
| CN109015421A (en) * | 2018-07-27 | 2018-12-18 | 安徽砥钻砂轮有限公司 | A kind of grinding wheel |
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