US20140013673A1 - Vitrified bonded grinding stone - Google Patents
Vitrified bonded grinding stone Download PDFInfo
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- US20140013673A1 US20140013673A1 US13/939,515 US201313939515A US2014013673A1 US 20140013673 A1 US20140013673 A1 US 20140013673A1 US 201313939515 A US201313939515 A US 201313939515A US 2014013673 A1 US2014013673 A1 US 2014013673A1
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- porous ceramics
- grinding stone
- substance
- vitrified
- aggregate
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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
- B24D3/14—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 ceramic, i.e. vitrified bondings
Definitions
- This invention relates to a vitrified bonded grinding stone which has a low grinding resistance by mixing aggregate which has strength lower than the abrasive grain with the grinding stone.
- a grinding stone which has a large abrasive grain distance between the grains by mixing aggregate which has strength lower than the abrasive grain with the binder in order to decrease the grinding resistance (in other words, reduced the degree of concentration of the abrasive grains) has been known.
- the aggregate disclosed in the Patent Document 1 porous ceramics are used as the aggregate which is easy to be fractured and difficult to be abraded with a ground material or material to be ground.
- Patent Document 1 JP2009-83036 A
- This invention was made considering the above issues of the related art and it is an object of the invention to provide a vitrified bonded grinding stone which can prevent the vitrified bond from the invasion into the pores of the porous ceramics and further can advance the fracturing of the porous ceramics by closing the pores of the porous ceramics by a substance which is weaker than the porous ceramics and yet which does not dissolve even under the burning temperature for burning the vitrified bond.
- the vitrified bonded grinding stone associated with the invention according to claim 1 is characterized in that a vitrified bonded grinding stone includes a vitrified bond in which super abrasives such as cubic crystal boron nitride grains or diamond grains and an aggregate are contained and the aggregate is formed by porous ceramics, and a substance which closes pores of the porous ceramics and wherein the strength of the substance is weaker than that of the porous ceramics and the substance has a physical property that the substance does not dissolve under the burning temperature of the vitrified bond.
- super abrasives such as cubic crystal boron nitride grains or diamond grains and an aggregate are contained and the aggregate is formed by porous ceramics, and a substance which closes pores of the porous ceramics and wherein the strength of the substance is weaker than that of the porous ceramics and the substance has a physical property that the substance does not dissolve under the burning temperature of the vitrified bond.
- the substance is filled in the pores of the porous ceramics to close the pores thereof.
- the aggregate of the grinding stone is formed by porous ceramics which are easily fractured when brought into contact with the material to be ground and the substance which is formed by a material, strength of which is weaker than the porous ceramics for closing the pores of the porous ceramics. Accordingly, a heat generated upon abrasion between the aggregate and the material to be ground can be suppressed and grinding burning of the material to be ground can be prevented. At the same time, even the vitrified bond is melted during the manufacturing of the grinding stone, such molten vitrified bond would not enter into the pores of the porous ceramics and the fracturing property of the porous ceramics cannot be influenced thereby.
- the pores of the porous ceramics are closed by the substance by filling the pores of the ceramics with the substance.
- the invasion of the vitrified bond into the pores of the porous ceramics can be easily prevented.
- FIG. 1 is an overall view of the vitrified bond grinding stone according to an embodiment of the invention.
- FIG. 2 is an enlarged view of the grinding stone layer of the vitrified bonded grinding stone.
- FIG. 3 is an enlarged view of grinding stone layer of the grinding stone upon grinding process.
- FIG. 1 shows an overall view of the vitrified bonded grinding stone
- FIG. 2 is an enlarged view of the structure of the vitrified bonded grinding stone at grinding surface area thereof.
- the vitrified bonded grinding stone 10 is formed by a disc shaped core 21 and a ring shaped grinding stone layer 22 fixed to an outer peripheral surface of the core 21 by bonding agent or by sintering.
- the core 21 is formed by a metal material, such as for example, copper, aluminum or titan, FRP (fiber reinforced plastic) material or a ceramics (normal grinding stone).
- the grinding stone layer 22 is formed by fixing the ring shaped burnt grinding stone layer onto the outer peripheral surface of the core 21 .
- the grinding stone layer 22 may be formed by adhering a plurality of grinding stone segments to the outer peripheral surface of the core 21 arranged to be a ring shaped profile.
- a central bore 23 is provided at the center of the core 21 and is engaged with a boss for centering projecting to an axial end of the grinding stone shaft of a grinding stone base (not shown).
- a plurality of bolt bores 24 is provided around the central bore 23 and the corresponding number of bolts is inserted onto the bolt bores 24 .
- the bolts are threaded into screwed bores which are open to the axial end of the grinding stone shaft.
- the vitrified bonded grinding stone 10 is fixed to the grinding stone shaft by inserting the bolts into the bolt bores 24 and threading the bolts with the screwed bores.
- the grinding stone base and table are provided on a grinding machine (not shown) and are slidably guided in a mutually perpendicularly intersecting with each other.
- the vitrified bonded grinding stone 10 is to be installed into the grinding machine.
- the grinding stone shaft is rotatably mounted on the grinding stone base in an axial line which is in parallel with a longitudinal direction of a material to be ground (work W) which is to be ground by the vitrified bonded grinding stone 10 .
- the grinding stone shaft is rotatably driven by a motor provided on the grinding stone base.
- a main shaft base and a tail stock are also provided on the grinding stone base and between the main shaft base and the tail stock, the material to be ground (work W) is rotatably supported in an axial line which is in parallel with the moving direction of the table.
- the grinding stone layer 22 is formed by a super abrasives 12 composed by CBN (cubic boron nitride) grains, an aggregate 14 the strength of which is weaker than that of the super abrasives 12 and a vitrified bon 16 which connects the super abrasives 12 and the aggregate 14 .
- the aggregate 14 is formed by a base material of porous ceramics 14 a and a substance 14 b which closes the openings of the pores of the porous ceramics 14 a to prevent invasion of the vitrified bond 16 into the pores of the porous ceramics 14 a.
- a substance such as for example, a glassy carbon, which is weaker than the porous ceramics 14 a and which does not dissolve at the burning temperature for burning the vitrified bond 16 is used.
- the aggregate 14 can be easily obtained by filling the substance 14 b in the pores of the porous ceramics 14 a under the vacuum atmosphere after manufacturing the porous ceramics.
- the porous ceramics 14 a is formed by burning by mixing the porous ceramics 14 a with the substance 14 b to close the opening of the pores of the porous ceramics 14 a.
- the vitrified bond 16 connects the neighboring super abrasives 12 , neighboring aggregates 14 and neighboring super abrasives 12 and aggregates 14 by bridging therebetween. Thus an air hole 18 is formed between the bridging portions 20 .
- the porosity of the porous ceramics 14 a is for example usually between 10% and 80% and preferably between 30% and 60% and in this range fracturing upon grinding can be effectively generated and maintain the strength which can maintain the structure of the grinding stone.
- the average grain diameter of the super abrasives 12 formed by CBN is for example, 115 ⁇ m (#170) and the average grain diameter of the porous ceramics 14 a is, for example, 100 ⁇ m (#200).
- the average grain diameter of the porous ceramics is about 87% of the average grain diameter of the super abrasives 12 .
- the structural strength of the grinding stone as the aggregate can be maintained by setting the grain diameter of the porous ceramics as the aggregate relative to the grain diameter of the super abrasives 12 to be in the range between 70% and 150%.
- the porous ceramics 14 a does not weaken the bridging portions 20 formed by the vitrified bond 16 .
- a diamond grinding grains can be used.
- the grinding stone layer 22 is formed by the CBN grains.
- the super abrasives 12 of the CBN, the porous ceramics 14 a filled with the substance 14 b such as glassy carbon (which is weaker in strength than the porous ceramics 14 a and which does not dissolve under the burning temperature of the vitrified bond 16 ) and the vitrified bond 16 are mixed with a predetermined proportion which is defined in advance and kneaded.
- the amount of the porous ceramics 14 a to be used is equal to or less than 50% of the entire volume of the grinding stone layer. If the amount of vitrified bond 16 in volume relative to the amounts Of the super abrasives 12 of CBN and the porous ceramics 14 a is excessively used, the bridging of the binder (bridging portion 20 ) between the neighboring porous ceramics 14 a, between the porous ceramics 14 a and neighboring super abrasives 12 is difficult to be formed and on the other hand, if the amount of porous ceramics 14 a relative to the vitrified bond 16 in volume is too small, the concentration degree of the super abrasives 12 increases, and accordingly the grinding resistance become big. Therefore, the proportion among the composites is defined in advance. Thus mixed mixture is filled in the formwork forming the space corresponding to the ring shaped grinding stone layer 22 and formed by press.
- the ring shaped grinding stone layer 22 which has been press-formed is then drawn from the formwork and burnt under the appropriate burning temperature of the vitrified bond 16 to manufacture the ring shaped grinding stone layer 22 .
- the vitrified bond 16 forms the bridging portions 20 and the air holes 18 between the neighboring super abrasives 12 due to the melting during the burning process.
- the pores of the porous ceramics 14 a are filled with the substance 14 b such as glassy carbon which does not dissolve under the burning temperature of the vitrified bond 16 , the invasion of the molten vitrified bond 16 into the pores of the porous ceramics 14 a can be prevented. Thereafter, thus burnt formed grinding stone layer 22 is fixed to the outer peripheral surface of the core 21 by bonding agent to complete the vitrified bonded grinding stone 10 .
- the porous ceramics 14 a becomes the core of the mesh which the vitrified bond 16 forms, and effectively forms the bridging portions 20 between the neighboring porous ceramics 14 a or the neighboring super abrasives and the porous ceramics 14 a.
- This can strengthen the structure of the vitrified bonded grinding stone 10 and at the same time prevent the super abrasives 12 from dropping off by abrasion and elongates the duration of life.
- vitrified bonded grinding stone 10 is fixed to the grinding stone shaft of the grinding stone base then the grinding stone shaft is driven by the motor to rotate the vitrified bonded grinding stone 10 . Then the work W to be ground supported between the main shaft base and the tail stock (not shown) is rotated in an axial line direction by rotating the main shaft of the main shaft base. Thus, the grinding stone base is advanced in a direction perpendicular to the axial line of the work W to grind the work W.
- the position of the aggregate 14 and the position of the outer peripheral surface of the grinding stone (projecting position of the super abrasives 12 ) of the grinding stone layer 22 of the vitrified bonded grinding stone 10 are approximately the same as shown in FIG. 2 , before the grinding process begins.
- the aggregate 14 is formed by a porous ceramics 14 a which material is weak and is formed with many pores, the aggregate 14 is fractured by the contact with the surface of the work W when grinding operation and as shown in FIG. 3 , and retreats from the front end position of the super abrasives 12 which oppose to the work S and serve as the cutting blade.
- the glassy carbon substance 14 b is filled in the pores of the porous ceramics 14 a. however, since the substance 14 b is weaker than the ceramics 14 a in strength and accordingly, the fracturing property of the porous ceramics 14 a will not be influenced by the grinding operation.
- the distance between the grains of the super abrasives 12 can be widened to reduce the grinding resistance.
- the aggregate 14 is structured by the porous ceramics 14 a which is easy to be fractured by the contact with the material (work W) to be ground, the porous ceramics 14 a is fractured when the ceramics 14 a is brought into contact with the work W upon grinding and further the fractured ceramics retreats from the grain position, which is the cutting blade position, to prevent heat generated when the aggregate 14 and the work W are abraded each other. This can further prevents grinding bum.
- the grinding efficiency can be improved by forming a chip pocket by the fractured ceramics, in which cutting waste is kept and wasted, and by accelerating circulation of cooling liquid.
- the substance 14 b which strength is weaker than the ceramics 14 a is filled in the pores of the porous ceramics 14 a as the aggregate 14 , the melted vitrified bond 16 melted upon manufacturing the grinding stone would not invade into the pores the porous ceramics 14 a. Accordingly, the fracturing performance of the porous ceramics 14 a cannot be impaired by the vitrified bond 16 which normally invaded into the pores of the porous ceramics 14 a and hardens therein after burning.
- glassy carbon is exampled.
- any substance may be used as long as the strength of the substance is weaker than the porous ceramics 14 a and the substance does not dissolve under the burning temperature of the vitrified bond 16 .
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The vitrified bonded grinding stone includes a vitrified bond in which super abrasives such as cubic crystal boron nitride grains or diamond grains and an aggregate are contained. The aggregate is formed by porous ceramics and a substance which closes pores of the porous ceramics and the substance is weaker in strength than the porous ceramics and has a physical property that the substance does not dissolve under a burning temperature of the vitrified bond.
Description
- This application is based on and claims priority under 35 U.S.C. 119 with respect to Japanese Application No. 2012-157172 filed on Jul. 13, 2012, the entire content of which is incorporated herein by reference.
- 1. Field of the Invention
- This invention relates to a vitrified bonded grinding stone which has a low grinding resistance by mixing aggregate which has strength lower than the abrasive grain with the grinding stone.
- 2. Description of Related Art
- As an example of the related arts, a grinding stone which has a large abrasive grain distance between the grains by mixing aggregate which has strength lower than the abrasive grain with the binder in order to decrease the grinding resistance (in other words, reduced the degree of concentration of the abrasive grains) has been known. As an example of the aggregate disclosed in the Patent Document 1, porous ceramics are used as the aggregate which is easy to be fractured and difficult to be abraded with a ground material or material to be ground.
- Patent Document 1: JP2009-83036 A
- However, according to the above grinding stone disclosed in the Patent Document 1, at the time of burning the binder, a melted binder may be invaded into the pores of the porous ceramics depending on the type of the binder which binds the abrasive grains and the aggregate. This may lead to the hardening of the binder invaded into the pores of the porous ceramics due to cooling and further, the porous ceramics are becoming difficult to be fractured and abrasion with the material to be ground occurs which leads to the burning due to the grinding and may result in the interference of originally aimed reducing of the grinding resistance.
- This invention was made considering the above issues of the related art and it is an object of the invention to provide a vitrified bonded grinding stone which can prevent the vitrified bond from the invasion into the pores of the porous ceramics and further can advance the fracturing of the porous ceramics by closing the pores of the porous ceramics by a substance which is weaker than the porous ceramics and yet which does not dissolve even under the burning temperature for burning the vitrified bond.
- The vitrified bonded grinding stone associated with the invention according to claim 1 is characterized in that a vitrified bonded grinding stone includes a vitrified bond in which super abrasives such as cubic crystal boron nitride grains or diamond grains and an aggregate are contained and the aggregate is formed by porous ceramics, and a substance which closes pores of the porous ceramics and wherein the strength of the substance is weaker than that of the porous ceramics and the substance has a physical property that the substance does not dissolve under the burning temperature of the vitrified bond.
- Further, according to the invention associated with claim 2, in claim 1, the substance is filled in the pores of the porous ceramics to close the pores thereof.
- According to the invention associated with claim 1, since the aggregate is mixed into the vitrified bonded grinding stone, a greater grain distance between the grains of the super abrasives can be obtained thereby to reduce the grinding resistance. Thus, a longer duration of life of the grinding stone can be expected. Further, according to the invention, the aggregate of the grinding stone is formed by porous ceramics which are easily fractured when brought into contact with the material to be ground and the substance which is formed by a material, strength of which is weaker than the porous ceramics for closing the pores of the porous ceramics. Accordingly, a heat generated upon abrasion between the aggregate and the material to be ground can be suppressed and grinding burning of the material to be ground can be prevented. At the same time, even the vitrified bond is melted during the manufacturing of the grinding stone, such molten vitrified bond would not enter into the pores of the porous ceramics and the fracturing property of the porous ceramics cannot be influenced thereby.
- According to the invention associated with claim 2, the pores of the porous ceramics are closed by the substance by filling the pores of the ceramics with the substance. Thus, the invasion of the vitrified bond into the pores of the porous ceramics can be easily prevented.
- Various aspects of this invention will become more apparent to those skilled in the art from the following detailed description of the preferred embodiments, when read in light of the accompanying drawings, in which:
-
FIG. 1 is an overall view of the vitrified bond grinding stone according to an embodiment of the invention; -
FIG. 2 is an enlarged view of the grinding stone layer of the vitrified bonded grinding stone; and -
FIG. 3 is an enlarged view of grinding stone layer of the grinding stone upon grinding process. - The embodiments of the invention will be explained hereinafter with reference to the attached drawings.
FIG. 1 shows an overall view of the vitrified bonded grinding stone andFIG. 2 is an enlarged view of the structure of the vitrified bonded grinding stone at grinding surface area thereof. - As shown in
FIG. 1 , the vitrified bondedgrinding stone 10 is formed by a disc shapedcore 21 and a ring shapedgrinding stone layer 22 fixed to an outer peripheral surface of thecore 21 by bonding agent or by sintering. Thecore 21 is formed by a metal material, such as for example, copper, aluminum or titan, FRP (fiber reinforced plastic) material or a ceramics (normal grinding stone). The grindingstone layer 22 is formed by fixing the ring shaped burnt grinding stone layer onto the outer peripheral surface of thecore 21. Alternately, the grindingstone layer 22 may be formed by adhering a plurality of grinding stone segments to the outer peripheral surface of thecore 21 arranged to be a ring shaped profile. - A
central bore 23 is provided at the center of thecore 21 and is engaged with a boss for centering projecting to an axial end of the grinding stone shaft of a grinding stone base (not shown). A plurality ofbolt bores 24 is provided around thecentral bore 23 and the corresponding number of bolts is inserted onto thebolt bores 24. The bolts are threaded into screwed bores which are open to the axial end of the grinding stone shaft. The vitrified bonded grindingstone 10 is fixed to the grinding stone shaft by inserting the bolts into thebolt bores 24 and threading the bolts with the screwed bores. - The grinding stone base and table are provided on a grinding machine (not shown) and are slidably guided in a mutually perpendicularly intersecting with each other. The vitrified bonded
grinding stone 10 is to be installed into the grinding machine. The grinding stone shaft is rotatably mounted on the grinding stone base in an axial line which is in parallel with a longitudinal direction of a material to be ground (work W) which is to be ground by the vitrified bondedgrinding stone 10. The grinding stone shaft is rotatably driven by a motor provided on the grinding stone base. A main shaft base and a tail stock are also provided on the grinding stone base and between the main shaft base and the tail stock, the material to be ground (work W) is rotatably supported in an axial line which is in parallel with the moving direction of the table. - As shown in
FIG. 2 , the grindingstone layer 22 is formed by asuper abrasives 12 composed by CBN (cubic boron nitride) grains, anaggregate 14 the strength of which is weaker than that of the superabrasives 12 and avitrified bon 16 which connects thesuper abrasives 12 and theaggregate 14. Theaggregate 14 is formed by a base material ofporous ceramics 14 a and asubstance 14 b which closes the openings of the pores of theporous ceramics 14 a to prevent invasion of thevitrified bond 16 into the pores of theporous ceramics 14 a. as thesubstance 14 b which closes the pores of theporous ceramics 14 a, a substance, such as for example, a glassy carbon, which is weaker than theporous ceramics 14 a and which does not dissolve at the burning temperature for burning thevitrified bond 16 is used. - The
aggregate 14 can be easily obtained by filling thesubstance 14 b in the pores of theporous ceramics 14 a under the vacuum atmosphere after manufacturing the porous ceramics. Alternatively, upon manufacturing theaggregate 14, theporous ceramics 14 a is formed by burning by mixing theporous ceramics 14 a with thesubstance 14 b to close the opening of the pores of theporous ceramics 14 a. - The vitrified
bond 16 connects the neighboring super abrasives 12, neighboringaggregates 14 and neighboring super abrasives 12 andaggregates 14 by bridging therebetween. Thus anair hole 18 is formed between thebridging portions 20. The porosity of theporous ceramics 14 a is for example usually between 10% and 80% and preferably between 30% and 60% and in this range fracturing upon grinding can be effectively generated and maintain the strength which can maintain the structure of the grinding stone. The average grain diameter of thesuper abrasives 12 formed by CBN is for example, 115 μm (#170) and the average grain diameter of theporous ceramics 14 a is, for example, 100 μm (#200). In this case, the average grain diameter of the porous ceramics is about 87% of the average grain diameter of the superabrasives 12. Thus, it is experimentally confirmed that the structural strength of the grinding stone as the aggregate can be maintained by setting the grain diameter of the porous ceramics as the aggregate relative to the grain diameter of thesuper abrasives 12 to be in the range between 70% and 150%. It is considered that theporous ceramics 14 a does not weaken the bridgingportions 20 formed by thevitrified bond 16. Instead of using CBS, a diamond grinding grains can be used. - Next, the manufacturing method of the vitrified bonded
grinding stone 10 according to the embodiment of the invention will be explained hereinafter. First, the grindingstone layer 22 is formed by the CBN grains. In this case, the super abrasives 12 of the CBN, theporous ceramics 14 a filled with thesubstance 14 b such as glassy carbon (which is weaker in strength than theporous ceramics 14 a and which does not dissolve under the burning temperature of the vitrified bond 16) and thevitrified bond 16 are mixed with a predetermined proportion which is defined in advance and kneaded. - For example, the amount of the
porous ceramics 14 a to be used is equal to or less than 50% of the entire volume of the grinding stone layer. If the amount of vitrifiedbond 16 in volume relative to the amounts Of thesuper abrasives 12 of CBN and theporous ceramics 14 a is excessively used, the bridging of the binder (bridging portion 20) between the neighboringporous ceramics 14 a, between theporous ceramics 14 a and neighboringsuper abrasives 12 is difficult to be formed and on the other hand, if the amount ofporous ceramics 14 a relative to thevitrified bond 16 in volume is too small, the concentration degree of thesuper abrasives 12 increases, and accordingly the grinding resistance become big. Therefore, the proportion among the composites is defined in advance. Thus mixed mixture is filled in the formwork forming the space corresponding to the ring shaped grindingstone layer 22 and formed by press. - The ring shaped grinding
stone layer 22 which has been press-formed is then drawn from the formwork and burnt under the appropriate burning temperature of thevitrified bond 16 to manufacture the ring shaped grindingstone layer 22. At this time, thevitrified bond 16 forms the bridgingportions 20 and the air holes 18 between the neighboringsuper abrasives 12 due to the melting during the burning process. However, since the pores of theporous ceramics 14 a are filled with thesubstance 14 b such as glassy carbon which does not dissolve under the burning temperature of thevitrified bond 16, the invasion of the moltenvitrified bond 16 into the pores of theporous ceramics 14 a can be prevented. Thereafter, thus burnt formed grindingstone layer 22 is fixed to the outer peripheral surface of the core 21 by bonding agent to complete the vitrified bonded grindingstone 10. - Thus manufactured vitrified bonded grinding
stone 10 has the grain diameter of theporous ceramics 14 a as the aggregate is approximately equal to the grain diameter of thesuper abrasives 12 and accordingly, theporous ceramics 14 a becomes the core of the mesh which the vitrifiedbond 16 forms, and effectively forms the bridgingportions 20 between the neighboringporous ceramics 14 a or the neighboring super abrasives and theporous ceramics 14 a. This can strengthen the structure of the vitrified bonded grindingstone 10 and at the same time prevent thesuper abrasives 12 from dropping off by abrasion and elongates the duration of life. - Next, the operation at the grinding machining using the vitrified bonded grinding
stone 10 according to the embodiment of the invention will be explained hereinafter. First the thus manufactured vitrified bonded grindingstone 10 is fixed to the grinding stone shaft of the grinding stone base then the grinding stone shaft is driven by the motor to rotate the vitrified bonded grindingstone 10. Then the work W to be ground supported between the main shaft base and the tail stock (not shown) is rotated in an axial line direction by rotating the main shaft of the main shaft base. Thus, the grinding stone base is advanced in a direction perpendicular to the axial line of the work W to grind the work W. - The position of the aggregate 14 and the position of the outer peripheral surface of the grinding stone (projecting position of the super abrasives 12) of the grinding
stone layer 22 of the vitrified bonded grindingstone 10 are approximately the same as shown inFIG. 2 , before the grinding process begins. However, since the aggregate 14 is formed by aporous ceramics 14 a which material is weak and is formed with many pores, the aggregate 14 is fractured by the contact with the surface of the work W when grinding operation and as shown inFIG. 3 , and retreats from the front end position of thesuper abrasives 12 which oppose to the work S and serve as the cutting blade. It is noted that theglassy carbon substance 14 b is filled in the pores of theporous ceramics 14 a. however, since thesubstance 14 b is weaker than theceramics 14 a in strength and accordingly, the fracturing property of theporous ceramics 14 a will not be influenced by the grinding operation. - According to the embodiment, since the aggregate 14 is mixed into the grinding
stone layer 22 of the vitrified bonded grindingstone 10, the distance between the grains of thesuper abrasives 12 can be widened to reduce the grinding resistance. Further, since the aggregate 14 is structured by theporous ceramics 14 a which is easy to be fractured by the contact with the material (work W) to be ground, theporous ceramics 14 a is fractured when theceramics 14 a is brought into contact with the work W upon grinding and further the fractured ceramics retreats from the grain position, which is the cutting blade position, to prevent heat generated when the aggregate 14 and the work W are abraded each other. This can further prevents grinding bum. Still further, the grinding efficiency can be improved by forming a chip pocket by the fractured ceramics, in which cutting waste is kept and wasted, and by accelerating circulation of cooling liquid. - Further, since the
substance 14 b which strength is weaker than theceramics 14 a is filled in the pores of theporous ceramics 14 a as the aggregate 14, the meltedvitrified bond 16 melted upon manufacturing the grinding stone would not invade into the pores theporous ceramics 14 a. Accordingly, the fracturing performance of theporous ceramics 14 a cannot be impaired by thevitrified bond 16 which normally invaded into the pores of theporous ceramics 14 a and hardens therein after burning. - According to the embodiment of the invention, as the substance, which is to be filled in the pores of the
porous ceramics 14 a, glassy carbon is exampled. However, any substance may be used as long as the strength of the substance is weaker than theporous ceramics 14 a and the substance does not dissolve under the burning temperature of thevitrified bond 16. - The invention is explained with the above embodiments, however, the invention is not limited to the embodiments explained above, but various other embodiments or modifications are within the scope of the invention as far as such are not deviated from the subject matter described in the claims.
Claims (2)
1. A vitrified bonded grinding stone comprising:
a vitrified bond in which super abrasives such as cubic crystal boron nitride grains or diamond grains and an aggregate are contained, wherein
the aggregate is formed by porous ceramics and a substance which closes pores of the porous ceramics;
the substance is weaker in strength than the porous ceramics and has a physical property that the substance does not dissolve under a burning temperature of the vitrified bond.
2. The vitrified bonded grinding stone according to claim 1 , wherein
the substance is filled in the pores of the porous ceramics to close the pores thereof.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012157172A JP5963586B2 (en) | 2012-07-13 | 2012-07-13 | Vitrified bond whetstone |
JP2012-157172 | 2012-07-13 |
Publications (1)
Publication Number | Publication Date |
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US20140013673A1 true US20140013673A1 (en) | 2014-01-16 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/939,515 Abandoned US20140013673A1 (en) | 2012-07-13 | 2013-07-11 | Vitrified bonded grinding stone |
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US (1) | US20140013673A1 (en) |
JP (1) | JP5963586B2 (en) |
CN (1) | CN103537994A (en) |
DE (1) | DE102013213654B4 (en) |
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CN110509193A (en) * | 2017-05-27 | 2019-11-29 | 江苏赛扬精工科技有限责任公司 | A kind of universal joint alley mill preparation method of nano-grade ceramic binding agent |
USD872780S1 (en) * | 2017-06-01 | 2020-01-14 | Sumitomo Electric Hardmetal Corp. | Dresser component for grindstone |
US20200238477A1 (en) * | 2017-10-11 | 2020-07-30 | A.L.M.T. Corp. | Vitrified bond super-abrasive grinding wheel |
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CN106944937A (en) * | 2017-03-17 | 2017-07-14 | 衢州学院 | A kind of preparation method of the diamond abrasive tool pellet of use porous ceramic skeleton resin reinforcing |
CN112917399A (en) * | 2021-03-10 | 2021-06-08 | 河南捷利达超硬制品有限公司 | Ceramic bond and preparation method and application thereof |
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JP2975033B2 (en) * | 1989-12-15 | 1999-11-10 | 株式会社ニートレックス本社 | Vitrified super abrasive whetstone |
JPH04322972A (en) * | 1991-04-24 | 1992-11-12 | Osaka Diamond Ind Co Ltd | Binder material for diamond abrasive grain |
JPH11188635A (en) * | 1997-12-25 | 1999-07-13 | Noritake Co Ltd | Grinding wheel |
US6679758B2 (en) * | 2002-04-11 | 2004-01-20 | Saint-Gobain Abrasives Technology Company | Porous abrasive articles with agglomerated abrasives |
JP4116333B2 (en) * | 2002-06-05 | 2008-07-09 | ミネベア株式会社 | Super finishing whetstone |
JP5398132B2 (en) * | 2007-09-28 | 2014-01-29 | 豊田バンモップス株式会社 | Grinding wheel |
DE102010006250A1 (en) * | 2010-01-28 | 2011-08-18 | Gottfried Wilhelm Leibniz Universität Hannover, 30167 | Abrasive article and method of making the same |
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2012
- 2012-07-13 JP JP2012157172A patent/JP5963586B2/en active Active
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2013
- 2013-07-09 CN CN201310286542.5A patent/CN103537994A/en active Pending
- 2013-07-11 US US13/939,515 patent/US20140013673A1/en not_active Abandoned
- 2013-07-12 DE DE102013213654.4A patent/DE102013213654B4/en not_active Expired - Fee Related
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US4784671A (en) * | 1987-03-06 | 1988-11-15 | Karl Elbel | Method of improving the grinding performance of grinding and honing bodies |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110509193A (en) * | 2017-05-27 | 2019-11-29 | 江苏赛扬精工科技有限责任公司 | A kind of universal joint alley mill preparation method of nano-grade ceramic binding agent |
CN110605671A (en) * | 2017-05-27 | 2019-12-24 | 江苏赛扬精工科技有限责任公司 | Preparation method of nano ceramic bond cBN grinding wheel for universal joint ball track grinding |
USD872780S1 (en) * | 2017-06-01 | 2020-01-14 | Sumitomo Electric Hardmetal Corp. | Dresser component for grindstone |
USD879846S1 (en) | 2017-06-01 | 2020-03-31 | Sumitomo Electric Hardmetal Corp. | Dresser component for grindstone |
USD879847S1 (en) | 2017-06-01 | 2020-03-31 | Sumitomo Electric Hardmetal Corp. | Dresser component for grindstone |
US20200238477A1 (en) * | 2017-10-11 | 2020-07-30 | A.L.M.T. Corp. | Vitrified bond super-abrasive grinding wheel |
US11673231B2 (en) * | 2017-10-11 | 2023-06-13 | A.L.M.T. Corp. | Vitrified bond super-abrasive grinding wheel |
Also Published As
Publication number | Publication date |
---|---|
JP5963586B2 (en) | 2016-08-03 |
JP2014018880A (en) | 2014-02-03 |
DE102013213654B4 (en) | 2017-06-29 |
DE102013213654A1 (en) | 2014-01-16 |
CN103537994A (en) | 2014-01-29 |
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