CN104002250A - Preparing method of ceramic bonding agent CBN (Cubic Boron Nitride) grinding wheel with precisely adjustable and controllable hardness attenuation value - Google Patents
Preparing method of ceramic bonding agent CBN (Cubic Boron Nitride) grinding wheel with precisely adjustable and controllable hardness attenuation value Download PDFInfo
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- CN104002250A CN104002250A CN201410254670.6A CN201410254670A CN104002250A CN 104002250 A CN104002250 A CN 104002250A CN 201410254670 A CN201410254670 A CN 201410254670A CN 104002250 A CN104002250 A CN 104002250A
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Abstract
The invention discloses a preparing method of a ceramic bonding agent CBN (Cubic Boron Nitride) grinding wheel with a precisely adjustable and controllable hardness attenuation value. The preparing method comprises the following steps that: 16 to 20 weight percent of boric acid, 9 weight percent of sodium carbonate, 5 weight percent of potassium carbonate, 8 weight percent of aluminum oxide, 4 weight percent of titanium dioxide, and 54 to 58 weight percent of silicon dioxide are pretreated; bonding agents are prepared through smelting; the bonding agents are crushed; the bonding agents are subjected to ball milling; 15 to 23 weight percent of bonding agent powder, 72 to 80 weight percent of CBN grinding materials, 3 weight percent of yellow dextrin powder and 2 weight percent of deionized water are poured into a grinding jar, ball milling is carried out, and grinding wheel forming materials are prepared; a grinding wheel is formed after pressurizing and drying; the grinding wheel is sintered; a buffer solution is prepared; and the buffer solution is utilized for adjusting and controlling the hardness of the grinding wheel, and the ceramic bonding agent CBN grinding wheel with the precisely adjustable and controllable hardness attenuation value is prepared. The preparing method has the advantages that the hardness of the prepared ceramic CBN grinding wheel is precise and controllable, the ceramic CBN grinding wheels which have different hardness and are suitable for being used for grinding different materials are obtained, and the grinding performance of the ceramic CBN grinding wheel is improved.
Description
Technical field
The present invention relates to emery wheel preparing technical field, relate in particular to a kind of preparation method of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value.
Background technology
Ceramic binder cubic boron nitride (CBN) emery wheel is large because having elastic modelling quantity, shape retention is good, grinding accuracy is high, self-sharpening can be good, grinding force is little, and in grinding process, caloric value is few, can reduce or avoid part to be processed scorch and micro-crack situation, extend the service life of part to be processed and increase reliability, being acknowledged as the best instrument of ferrous metal accurate grinding.The preparation technology of Vitrified Bond CBN Grinding Wheel is identical with traditional ceramic preparation technology at present: vitrified bond is mixed by formula with CBN, and dry-pressing formed, after biscuit is dry, with certain sintering schedule sintering, last bonding matrix, finishing are put the first edge on a knife or a pair of scissors.Its hardness of CBN emery wheel after sintering has reflected the hold of bonding agent to abrasive material CBN, and hardness is higher, and bonding agent is stronger to the hold of CBN, and grinding process CBN abrasive material is more difficult to come off, and sharpness and the self-sharpening of emery wheel are lower.Therefore the mentality of designing of Vitrified Bond CBN Grinding Wheel is to design Wheel hardness according to the hardness of grinding workpiece material: be ground material harder, the easier passivation of CBN abrasive material in grinding process, the emery wheel of design just should be softer, by accelerating the sharpness that comes off to improve emery wheel of CBN abrasive material.The hardness of CBN emery wheel can change by adjusting the technological parameters such as bonding agent addition, compact density and sintering schedule.According to the preparation technology of existing ceramic CBN emery wheel, once after emery wheel sintering completes, the hardness of emery wheel is steady state value, can not change.But in the time of industrial production pottery CBN emery wheel, even with a collection of emery wheel, the position difference that each emery wheel is placed in kiln, all can cause the difference of actual sintered temperature, thereby makes the hardness of emery wheel produce fluctuation, affects the serviceability of emery wheel.On the other hand, the different materials that are ground just need to be prepared the ceramic CBN emery wheel of different formulations and carry out grinding, and this has limited the range of application of CBN emery wheel greatly.
If can prepare a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value, the CBN emery wheel after sintering, by technology controlling and process, the decay of accuracy controlling CBN Wheel hardness, makes every Wheel hardness all reach desired value interval.This technique can improve the grinding stability of ceramic CBN emery wheel on the one hand, improve the grinding performance of CBN emery wheel, on the other hand, with a slice CBN emery wheel, by adjusting process parameter, can obtain the emery wheel of different hardness, the material of grinding different hardness, widen the scope of application of CBN emery wheel, simplified operation.
Summary of the invention
The technical problem that basic background technology exists, the present invention proposes a kind of preparation method of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value, make the hardness of prepared ceramic CBN emery wheel accurately controlled, obtain the ceramic CBN emery wheel that is applicable to grinding unlike material of different hardness, improve the grinding performance of ceramic CBN emery wheel.
The preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes, comprises the steps:
S1, bonding agent pretreatment of raw material: by weight percentage 16-20% boric acid, 9% sodium carbonate, 5% potash, 8% aluminium oxide, 4% titanium dioxide, 54-58% silica are poured in the first ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling 30min obtains pretreated bonding agent raw material, wherein the first ball milling altar rotational velocity is 30r/min, the first ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S2, melting bonding agent: crucible furnace is warmed up to 1350 DEG C with the programming rate of 3-5 DEG C/min, pour bonding agent pretreated feedstock into, again be raised to after 1350 DEG C until furnace temperature, be incubated and within 0.5 hour, obtain melted join agent, melted join agent is carried out to shrend and obtain vitrified bond fragment, wherein the ratio of the volume of bonding agent pretreated feedstock and crucible internal volume is 4:5;
S3, broken bonding agent: vitrified bond fragment is placed in to the second ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds corundum ball milling ball, add again after water ball milling 24 hours, taking-up is poured into and in material holding tray, is obtained bonding agent slurry, wherein the weight ratio of water and vitrified bond fragment is 1:1, the second ball milling altar rotational velocity is 30r/min, the second ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, diameter accounts for 40% at the corundum ball milling ball of 20-50mm, and the corundum ball milling ball that diameter is less than 20mm accounts for 30%;
S4, ball milling bonding agent: in connection with obtaining bonding agent material piece after agent slurry drying, baking temperature is 120 DEG C, be placed in the 3rd ball milling altar in connection with agent material piece again, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling takes out and crosses 180# screen cloth for 4 hours and obtains bonding agent powder, be placed in the container of sealing in connection with agent powder, wherein the 3rd ball milling altar rotational velocity is 30r/min, the 3rd ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S5, prepare abrasive wheel forming material: by weight percentage 15-23% bonding agent powder, 72-80%CBN abrasive material, 3% yellow starch gum powder and 2% deionized water are poured in the 4th ball milling altar, add after corundum ball milling ball in the ratio of ball material mass ratio 0.8:1, after ball milling takes out and cross 40# screen cloth for 1 hour, sealing preservation obtains abrasive wheel forming material, wherein the 4th ball milling altar rotational velocity is 30r/min, the 4th ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 40mm accounts for 30%, and the corundum ball milling ball that diameter is less than 40mm accounts for 70%;
S6, abrasive wheel forming: after abrasive wheel forming material is crossed to 60# screen cloth, put in mould, extrusion forming, obtains emery wheel biscuit A after pressurize 1min, emery wheel biscuit A is placed horizontally on SiC refractory slab, under room temperature, place after 24 hours, drier within 12 hours, obtain emery wheel biscuit B, wherein baking temperature is 70 DEG C;
S7, sintering emery wheel: the emery wheel biscuit B on SiC refractory slab and placement SiC refractory slab is put into shaft furnace, heating rate with 3-5 DEG C/min is warming up to 500-550 DEG C, insulation 1-2 hour, be warming up to 800-850 DEG C with the heating rate of 2-4 DEG C/min again, insulation 1.5-2 hour, stop heating and make shaft furnace naturally cooling, when furnace temperature open during lower than 150 DEG C fire door continue cooling, when furnace temperature during lower than 70 DEG C taking-up obtain emery wheel sintered body;
S8, preparation cushioning liquid: sodium carbonate is joined and in deionized water, is mixed with the first solution, borax is joined and in deionized water, is mixed with the second solution, by the first solution and the second solution by volume 973:27 mix and obtain cushioning liquid, in the first solution, the mass ratio of sodium carbonate and deionized water is 52:9948, and in the second solution, the mass ratio of borax and deionized water is 19:981;
S9, regulation and control Wheel hardness: the emery wheel sintered body after sintering is carried out after preprocessing on cutter and tool grinding machine, the original HRB hardness of measuring emery wheel on Rockwell hardness instrument, CBN emery wheel original hardness is X1, emery wheel target hardness is X2, the soak time of emery wheel is t hour, according to formula
obtain the time of the required immersion of emery wheel, cushioning liquid is poured in container, holding temperature after cushioning liquid heating water bath to 50 DEG C, emery wheel was immersed in cushioning liquid after t hour, pull CBN emery wheel deionized water rinsing out to neutral, after oven dry, obtain can accuracy controlling hardness attenuation value Vitrified Bond CBN Grinding Wheel, wherein the volume ratio of the emery wheel base substrate after sintering and cushioning liquid is 1:20.
Preferably, in S6, the compact density of Vitrified Bond CBN Grinding Wheel is (2.15 ± 0.05) g/cm
3.
The present invention adopts melting-crush method to prepare the R that can produce constant speed hydrolysis under alkaline environment
2o-B
2o
3-SiO
2-TiO
2be CBN vitrified bond, after this bonding agent and CBN abrasive material are mixed by component design, after dry-pressing formed and pressureless sintering, prepare Vitrified Bond CBN Grinding Wheel; The CBN emery wheel of preparing be impregnated in the cushioning liquid that the pH value under uniform temperature is 11 to the R in bonding agent
+h in meeting and solution
+produce ion-exchange, bonding agent is hydrolyzed with constant rate of speed, reduce the hold of bonding agent to CBN abrasive material, when emery wheel original hardness is during higher than HRB80, the pad value of Wheel hardness becomes strict proportional relationship with dip time, when Wheel hardness reaches after target hardness, emery wheel is taken out to water and rinse to neutral oven dry, obtain ceramic CBN emery wheel.The present invention solves the problem that ceramic CBN Wheel hardness after sintering is difficult to accurate adjustment, make the ceramic CBN emery wheel sintered body of same recipe, by the immersion treatment of later stage alkaline buffer solution, can obtain the CBN emery wheel that is applicable to grinding unlike material of different hardness, improve the grinding performance of ceramic CBN emery wheel.
Brief description of the drawings
Fig. 1 is that the prepared vitrified bond of preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes soaks the hydrolysis etch pit pattern that rear surface produces in cushioning liquid.
Fig. 2 is microstructure after the prepared emery wheel of preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes soaks in cushioning liquid.
Detailed description of the invention
Below, by specific embodiment, technical scheme of the present invention is elaborated.
Embodiment 1
The preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes, comprises the steps:
S1, bonding agent pretreatment of raw material: by weight percentage 16% boric acid, 9% sodium carbonate, 5% potash, 8% aluminium oxide, 4% titanium dioxide, 58% silica are poured in the first ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling 30min obtains bonding agent pretreated feedstock, wherein the first ball milling altar rotational velocity is 30r/min, the first ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S2, melting bonding agent: crucible furnace is warmed up to 1350 DEG C with the programming rate of 3 DEG C/min, pour bonding agent pretreated feedstock into, again be raised to after 1350 DEG C until furnace temperature, be incubated and within 0.5 hour, obtain melted join agent, melted join agent is carried out to shrend and obtain vitrified bond fragment, wherein the ratio of the volume of bonding agent pretreated feedstock and crucible internal volume is 4:5;
S3, broken bonding agent: vitrified bond fragment is placed in to the second ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds corundum ball milling ball, add again after water ball milling 24 hours, taking-up is poured into and in material holding tray, is obtained bonding agent slurry, wherein the weight ratio of water and vitrified bond fragment is 1:1, the second ball milling altar rotational velocity is 30r/min, the second ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, diameter accounts for 40% at the corundum ball milling ball of 20-50mm, and the corundum ball milling ball that diameter is less than 20mm accounts for 30%;
S4, ball milling bonding agent: in connection with obtaining bonding agent material piece after agent slurry drying, baking temperature is 120 DEG C, be placed in the 3rd ball milling altar in connection with agent material piece again, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling takes out and crosses 180# screen cloth for 4 hours and obtains bonding agent powder, be placed in the container of sealing in connection with agent powder, wherein the 3rd ball milling altar rotational velocity is 30r/min, the 3rd ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S5, prepare abrasive wheel forming material: the CBN abrasive material that is 120/140# by 23% bonding agent powder, 72% abrasive grain by weight percentage, 3% yellow starch gum powder and 2% deionized water are poured in the 4th ball milling altar, add after corundum ball milling ball in the ratio of ball material mass ratio 0.8:1, after ball milling takes out and cross 40# screen cloth for 1 hour, sealing preservation obtains abrasive wheel forming material, wherein the 4th ball milling altar rotational velocity is 30r/min, the 4th ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 40mm accounts for 30%, and the corundum ball milling ball that diameter is less than 40mm accounts for 70%;
S6, abrasive wheel forming: after abrasive wheel forming material is crossed to 60# screen cloth, put in mould, extrusion forming, after pressurize 1min, obtain emery wheel biscuit A, emery wheel biscuit A is placed horizontally on SiC refractory slab, under room temperature, place after 24 hours, be dried and within 12 hours, obtain emery wheel biscuit B again, wherein baking temperature is 70 DEG C, and the compact density of Vitrified Bond CBN Grinding Wheel is 2.1g/cm
3;
S7, sintering emery wheel: the emery wheel biscuit B on SiC refractory slab and placement SiC refractory slab is put into shaft furnace, be warming up to 500 DEG C with the heating rate of 5 DEG C/min, be incubated 2 hours, be warming up to 850 DEG C with the heating rate of 2 DEG C/min again, be incubated 1.5 hours, stop heating and make shaft furnace naturally cooling, when furnace temperature open during lower than 150 DEG C fire door continue cooling, when furnace temperature during lower than 70 DEG C taking-up obtain emery wheel base substrate;
S8, preparation cushioning liquid: sodium carbonate is joined and in deionized water, is mixed with the first solution, borax is joined and in deionized water, is mixed with the second solution, by the first solution and the second solution by volume 973:27 mix and obtain cushioning liquid, in the first solution, the mass ratio of sodium carbonate and deionized water is 52:9948, and in the second solution, the mass ratio of borax and deionized water is 19:981;
S9, regulation and control Wheel hardness: the emery wheel base substrate after sintering is carried out after preprocessing on cutter and tool grinding machine, on Rockwell hardness instrument, measure the original HRB hardness of emery wheel, CBN emery wheel original hardness X1 is 80, and emery wheel target hardness of X 2 is 75, the soak time of emery wheel is t hour, according to formula
the time that obtains the required immersion of emery wheel is 0.78 hour, cushioning liquid is poured in container, holding temperature after cushioning liquid heating water bath to 50 DEG C, emery wheel was immersed in cushioning liquid after 0.78 hour, pull CBN emery wheel deionized water rinsing out to neutral, after oven dry, obtain the Vitrified Bond CBN Grinding Wheel of accuracy controlling hardness attenuation value, wherein the volume ratio of the emery wheel base substrate after sintering and cushioning liquid is 1:20.
Embodiment 2
The preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes, comprises the steps:
S1, bonding agent pretreatment of raw material: by weight percentage 20% boric acid, 9% sodium carbonate, 5% potash, 8% aluminium oxide, 4% titanium dioxide, 54% silica are poured in the first ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling 30min obtains bonding agent pretreated feedstock, the first ball milling altar rotational velocity is 30r/min, the first ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S2, melting bonding agent: crucible furnace is warmed up to 1350 DEG C with the programming rate of 5 DEG C/min, pour bonding agent pretreated feedstock into, again be raised to after 1350 DEG C until furnace temperature, be incubated and within 0.5 hour, obtain melted join agent, melted join agent is carried out to shrend and obtain vitrified bond fragment, wherein the ratio of the volume of bonding agent pretreated feedstock and crucible internal volume is 4:5;
S3, broken bonding agent: vitrified bond fragment is placed in to the second ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds corundum ball milling ball, add again after water ball milling 24 hours, taking-up is poured into and in material holding tray, is obtained bonding agent slurry, wherein the weight ratio of water and vitrified bond fragment is 1:1, the second ball milling altar rotational velocity is 30r/min, the second ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, diameter accounts for 40% at the corundum ball milling ball of 20-50mm, and the corundum ball milling ball that diameter is less than 20mm accounts for 30%;
S4, ball milling bonding agent: in connection with obtaining bonding agent material piece after agent slurry drying, baking temperature is 120 DEG C, be placed in the 3rd ball milling altar in connection with agent material piece again, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling takes out and crosses 180# screen cloth for 4 hours and obtains bonding agent powder, be placed in the container of sealing in connection with agent powder, wherein the 3rd ball milling altar rotational velocity is 30r/min, the 3rd ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S5, prepare abrasive wheel forming material: the CBN abrasive material that is 200/230# by 15% bonding agent powder, 80% abrasive grain by weight percentage, 3% yellow starch gum powder and 2% deionized water are poured in the 4th ball milling altar, add after corundum ball milling ball in the ratio of ball material mass ratio 0.8:1, after ball milling takes out and cross 40# screen cloth for 1 hour, sealing preservation obtains abrasive wheel forming material, the 4th ball milling altar rotational velocity is 30r/min, the 4th ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 40mm accounts for 30%, and the corundum ball milling ball that diameter is less than 40mm accounts for 70%;
S6, abrasive wheel forming: after abrasive wheel forming material is crossed to 60# screen cloth, put in mould, extrusion forming, after pressurize 1min, obtain emery wheel biscuit A, emery wheel biscuit A is placed horizontally on SiC refractory slab, under room temperature, place after 24 hours, be dried and within 12 hours, obtain emery wheel biscuit B again, wherein baking temperature is 70 DEG C, and the compact density of Vitrified Bond CBN Grinding Wheel is 2.2g/cm
3;
S7, sintering emery wheel: the emery wheel biscuit B on SiC refractory slab and placement SiC refractory slab is put into shaft furnace, be warming up to 550 DEG C with the heating rate of 3 DEG C/min, be incubated 1 hour, be warming up to 800 DEG C with the heating rate of 4 DEG C/min again, be incubated 1.7 hours, stop heating and make shaft furnace naturally cooling, when furnace temperature open during lower than 150 DEG C fire door continue cooling, when furnace temperature during lower than 70 DEG C taking-up obtain emery wheel base substrate;
S8, preparation cushioning liquid: sodium carbonate is joined and in deionized water, is mixed with the first solution, borax is joined and in deionized water, is mixed with the second solution, by the first solution and the second solution by volume 973:27 mix and obtain cushioning liquid, in the first solution, the mass ratio of sodium carbonate and deionized water is 52:9948, and in the second solution, the mass ratio of borax and deionized water is 19:981;
S9, regulation and control Wheel hardness: the emery wheel base substrate after sintering is carried out after preprocessing on cutter and tool grinding machine, on Rockwell hardness instrument, measure the original HRB hardness of emery wheel, CBN emery wheel original hardness X1 is 88, and emery wheel target hardness of X 2 is 75, the soak time of emery wheel is t hour, according to formula
the time that obtains the required immersion of emery wheel is 1.85 hours, cushioning liquid is poured in container, holding temperature after cushioning liquid heating water bath to 50 DEG C, emery wheel was immersed in cushioning liquid after 1.85 hours, pull CBN emery wheel deionized water rinsing out to neutral, after oven dry, obtain the Vitrified Bond CBN Grinding Wheel of accuracy controlling hardness attenuation value, wherein the volume ratio of the emery wheel base substrate after sintering and cushioning liquid is 1:20
Embodiment 3
The preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes, comprises the steps:
S1, bonding agent pretreatment of raw material: by weight percentage 18% boric acid, 9% sodium carbonate, 5% potash, 8% aluminium oxide, 4% titanium dioxide, 56% silica are poured in the first ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling 30min obtains bonding agent pretreated feedstock, the first ball milling altar rotational velocity is 30r/min, the first ball milling altar diameter is 400mm, the corundum ball milling ball that is 50mm by diameter accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S2, melting bonding agent: crucible furnace is warmed up to 1350 DEG C with the programming rate of 4 DEG C/min, pour bonding agent pretreated feedstock into, again be raised to after 1350 DEG C until furnace temperature, be incubated and within 0.5 hour, obtain melted join agent, melted join agent is carried out to shrend and obtain vitrified bond fragment, wherein the ratio of the volume of bonding agent pretreated feedstock and crucible internal volume is 4:5;
S3, broken bonding agent: vitrified bond fragment is placed in to the second ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, add again after water ball milling 24 hours, taking-up is poured into and in material holding tray, is obtained bonding agent slurry, wherein the weight ratio of water and vitrified bond fragment is 1:1, the second ball milling altar rotational velocity is 30r/min, the second ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, diameter accounts for 40% at the corundum ball milling ball of 20-50mm, and the corundum ball milling ball that diameter is less than 20mm accounts for 30%;
S4, ball milling bonding agent: in connection with obtaining bonding agent material piece after agent slurry drying, baking temperature is 120 DEG C, be placed in the 3rd ball milling altar in connection with agent material piece again, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling takes out and crosses 180# screen cloth for 4 hours and obtains bonding agent powder, be placed in the container of sealing in connection with agent powder, wherein the 3rd ball milling altar rotational velocity is 30r/min, the 3rd ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S5, prepare abrasive wheel forming material: the CBN abrasive material that is 140/170# by 20% bonding agent powder, 75% abrasive grain by weight percentage, 3% yellow starch gum powder and 2% deionized water are poured in the 4th ball milling altar, add after corundum ball milling ball in the ratio of ball material mass ratio 0.8:1, after ball milling takes out and cross 40# screen cloth for 1 hour, sealing preservation obtains abrasive wheel forming material, the 4th ball milling altar rotational velocity is 30r/min, the 4th ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 40mm accounts for 30%, and the corundum ball milling ball that diameter is less than 40mm accounts for 70%;
S6, abrasive wheel forming: after abrasive wheel forming material is crossed to 60# screen cloth, put in mould, extrusion forming, after pressurize 1min, obtain emery wheel biscuit A, emery wheel biscuit A is placed horizontally on SiC refractory slab, under room temperature, place after 24 hours, be dried and within 12 hours, obtain emery wheel biscuit B again, wherein baking temperature is 70 DEG C, and the compact density of Vitrified Bond CBN Grinding Wheel is 2.15g/cm
3;
S7, sintering emery wheel: the emery wheel biscuit B on SiC refractory slab and placement SiC refractory slab is put into shaft furnace, be warming up to 530 DEG C with the heating rate of 4 DEG C/min, be incubated 1.4 hours, be warming up to 830 DEG C with the heating rate of 3 DEG C/min again, be incubated 1.8 hours, stop heating and make shaft furnace naturally cooling, when furnace temperature open during lower than 150 DEG C fire door continue cooling, when furnace temperature during lower than 70 DEG C taking-up obtain emery wheel base substrate;
S8, preparation cushioning liquid: sodium carbonate is joined and in deionized water, is mixed with the first solution, borax is joined and in deionized water, is mixed with the second solution, by the first solution and the second solution by volume 973:27 mix and obtain cushioning liquid, in the first solution, the mass ratio of sodium carbonate and deionized water is 52:9948, and in the second solution, the mass ratio of borax and deionized water is 19:981;
S9, regulation and control Wheel hardness: the emery wheel base substrate after sintering is carried out after preprocessing on cutter and tool grinding machine, on Rockwell hardness instrument, measure the original HRB hardness of emery wheel, CBN emery wheel original hardness X1 is 90, and emery wheel target hardness of X 2 is 75, the soak time of emery wheel is t hour, according to formula
the time that obtains the required immersion of emery wheel is 2.08 hours, cushioning liquid is poured in container, holding temperature after cushioning liquid heating water bath to 50 DEG C, emery wheel was immersed in cushioning liquid after 2.08 hours, pull CBN emery wheel deionized water rinsing out to neutral, after oven dry, obtain the Vitrified Bond CBN Grinding Wheel of accuracy controlling hardness attenuation value, wherein the volume ratio of the emery wheel base substrate after sintering and cushioning liquid is 1:20.
The present invention adopts melting-crush method to prepare the R that can produce constant speed hydrolysis under alkaline environment
2o-B
2o
3-SiO
2-TiO
2be CBN vitrified bond, after this bonding agent and CBN abrasive material are mixed by component design, after dry-pressing formed and pressureless sintering, prepare Vitrified Bond CBN Grinding Wheel, the CBN emery wheel of preparing be impregnated in the cushioning liquid that the pH value under uniform temperature is 11 to the R in bonding agent
+h in meeting and solution
+produce ion-exchange, bonding agent is hydrolyzed with constant rate of speed, reduce the hold of bonding agent to CBN abrasive material, when emery wheel original hardness is during higher than HRB80, the pad value of Wheel hardness becomes strict proportional relationship with dip time, when Wheel hardness reaches after target hardness, emery wheel is taken out to water to be rinsed to neutral oven dry, obtain ceramic CBN emery wheel, as depicted in figs. 1 and 2, Fig. 1 is that the prepared bonding agent of preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes soaks the hydrolysis etch pit pattern that rear surface produces in cushioning liquid, Fig. 2 is microstructure after the prepared emery wheel of preparation method of a kind of Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value that the present invention proposes soaks in cushioning liquid.The present invention solves the problem that ceramic CBN Wheel hardness after sintering is difficult to accurate adjustment, make the ceramic CBN emery wheel sintered body of same recipe, by the immersion treatment of later stage alkaline buffer solution, can obtain the CBN emery wheel that is applicable to grinding unlike material of different hardness, improve the grinding performance of ceramic CBN emery wheel.
The above; it is only preferably detailed description of the invention of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. a preparation method for Vitrified Bond CBN Grinding Wheel that can accuracy controlling hardness attenuation value, is characterized in that, comprises the steps:
S1, bonding agent pretreatment of raw material: by weight percentage 16-20% boric acid, 9% sodium carbonate, 5% potash, 8% aluminium oxide, 4% titanium dioxide, 54-58% silica are poured in the first ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling 30min obtains pretreated bonding agent raw material, wherein the first ball milling altar rotational velocity is 30r/min, the first ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S2, melting bonding agent: crucible furnace is warmed up to 1350 DEG C with the programming rate of 3-5 DEG C/min, pour pretreated bonding agent raw material into, again be raised to after 1350 DEG C until furnace temperature, be incubated and within 0.5 hour, obtain melted join agent, melted join agent is carried out to shrend and obtain vitrified bond fragment, wherein the ratio of the volume of bonding agent pretreated feedstock and crucible internal volume is 4:5;
S3, broken bonding agent: vitrified bond fragment is placed in to the second ball milling altar, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, add again after water ball milling 24 hours, taking-up is poured into and in material holding tray, is obtained bonding agent slurry, wherein the weight ratio of water and vitrified bond fragment is 1:1, the second ball milling altar rotational velocity is 30r/min, the second ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, diameter accounts for 40% at the corundum ball milling ball of 20-50mm, and the corundum ball milling ball that diameter is less than 20mm accounts for 30%;
S4, ball milling bonding agent: in connection with obtaining bonding agent material piece after agent slurry drying, baking temperature is 120 DEG C, be placed in the 3rd ball milling altar in connection with agent material piece again, the ratio that is 1.2:1 in ball material mass ratio adds after corundum ball milling ball, ball milling takes out and crosses 180# screen cloth and obtains bonding agent powder after 4 hours, be placed in the container of sealing in connection with agent powder, wherein the 3rd ball milling altar rotational velocity is 30r/min, the 3rd ball milling altar diameter is 400mm, diameter is that the corundum ball milling ball of 50mm accounts for 30%, and the corundum ball milling ball that diameter is less than 50mm accounts for 70%;
S5, prepare abrasive wheel forming material: by weight percentage 15-23% bonding agent powder, 72-80%CBN abrasive material, 3% yellow starch gum powder and 2% deionized water are poured in the 4th ball milling altar, add after corundum ball milling ball in the ratio of ball material mass ratio 0.8:1, after ball milling takes out and cross 40# screen cloth for 1 hour, sealing preservation obtains abrasive wheel forming material, wherein the 4th ball milling altar rotational velocity is 30r/min, the 4th ball milling altar diameter 400mm, diameter is that the corundum ball milling ball of 40mm accounts for 30%, and the corundum ball milling ball that diameter is less than 40mm accounts for 70%;
S6, abrasive wheel forming: after abrasive wheel forming material is crossed to 60# screen cloth, put in mould, extrusion forming, obtains emery wheel biscuit A after pressurize 1min, emery wheel biscuit A is placed horizontally on SiC refractory slab, under room temperature, place after 24 hours, drier within 12 hours, obtain emery wheel biscuit B, wherein baking temperature is 70 DEG C;
S7, sintering emery wheel: the emery wheel biscuit B on SiC refractory slab and placement SiC refractory slab is put into shaft furnace, heating rate with 3-5 DEG C/min is warming up to 500-550 DEG C, insulation 1-2 hour, be warming up to 800-850 DEG C with the heating rate of 2-4 DEG C/min again, insulation 1.5-2 hour, stop heating and make shaft furnace naturally cooling, when furnace temperature open during lower than 150 DEG C fire door continue cooling, when furnace temperature during lower than 70 DEG C taking-up obtain emery wheel base substrate;
S8, preparation cushioning liquid: sodium carbonate is joined and in deionized water, is mixed with the first solution, borax is joined and in deionized water, is mixed with the second solution, by the first solution and the second solution by volume 973:27 mix and obtain cushioning liquid, in the first solution, the mass ratio of sodium carbonate and deionized water is 52:9948, and in the second solution, the mass ratio of borax and deionized water is 19:981;
S9, regulation and control Wheel hardness: the emery wheel base substrate after sintering is carried out after preprocessing on cutter and tool grinding machine, the original HRB hardness of measuring emery wheel on Rockwell hardness instrument, CBN emery wheel original hardness is X1, emery wheel target hardness is X2, the soak time of emery wheel is t hour, according to formula
obtain the time of the required immersion of emery wheel, cushioning liquid is poured in container, holding temperature after cushioning liquid heating water bath to 50 DEG C, emery wheel was immersed in cushioning liquid after t hour, pull CBN emery wheel deionized water rinsing out to neutral, after oven dry, obtain can accuracy controlling hardness attenuation value Vitrified Bond CBN Grinding Wheel, wherein the volume ratio of the emery wheel after sintering and cushioning liquid is 1:20.
2. the preparation method of Vitrified Bond CBN Grinding Wheel that as claimed in claim 1 can accuracy controlling hardness attenuation value, is characterized in that, in S6, the compact density of Vitrified Bond CBN Grinding Wheel is (2.15 ± 0.05) g/cm
3.
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