JP2003266317A - Super abrasive grain grinding wheel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a super abrasive grain grinding wheel and its manufacturing method with high accuracy which is excellent in rigidity, hard to be deformed and can endure high-speed rotation. <P>SOLUTION: On the top face of a vacuum work table 11, a core metal blank 1a with a flange constituting a core metal 1 of the super abrasive grain grinding wheel is loaded with the flange part 1b beneath through an O ring 13, and a mother die 10 with an abrasive grain layer formed in the previous process is fitted with the core metal port at the center and loaded on the top face of the flange 1b, a grain 5 is closely filled between the core metal part and an abrasive grain layer 3 on the inner circumference of the mother die 10, an adhesive 6 is filled on its top face. When the inside of the vacuum work table 11 is vacuum sucked with a vacuum pump in that state, the adhesive 6 filled on the top face is sucked through a suction hole 12 of the vacuum work table 11 and a hole 1c opened on the flange part 1b of the core metal blank so that the adhesive 6 is evenly impregnated between the grains 5 and the super abrasive grain grinding wheel which can endure high-speed rotation can be formed easily. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superabrasive grain grindstone in which superabrasive grains such as CBN (cubic boron nitride) and diamond grains are electrodeposited, and a method for producing the same.

[0002]

2. Description of the Related Art An electrodeposition type superabrasive grindstone has a CB on its outer surface.
It is a rotary grindstone having an abrasive grain layer in which superabrasive grains such as N and diamond are fixed. The electroformed superabrasive grindstone is one in which superabrasive particles are fixed by metal by electroplating, and the shape of the master die that has been precisely finished can be inverted as it is on the surface. It can be manufactured relatively easily. An electroformed superabrasive grindstone is usually filled with superabrasive grains such as diamond abrasive grains on the inner peripheral surface of a conductive mother die such as carbon, and electroplating one layer of the superabrasive grains to the inner periphery of the mother die. After temporarily fixing it to the surface, excess superabrasive grains are removed, and electroplating is further performed by electroplating to fix the superabrasive grains to form an abrasive grain layer, and then tin is provided between the abrasive grain layer and the core metal. It is manufactured by pouring a melt of a low melting alloy such as a bismuth alloy or a tin-lead alloy and then solidifying it to bond it.

[0003]

However, in the conventional electroformed superabrasive grindstone, the abrasive grain layer and the cored bar are joined by pouring a melt of a low melting alloy between them and solidifying them. ,
Even with a low-melting alloy, the temperature thereof reaches about 200 ° C., and there is a problem that the difference in the coefficient of thermal expansion of the constituent materials and the contraction during solidification of the alloy distort the surface of the abrasive grain layer and cause deformation. In addition, the low-melting alloy has a problem that it has a weak bonding force between the abrasive grain layer and the core metal, and cannot withstand the high-speed rotation of the superabrasive grain grindstone. However, there is also a problem that deformation occurs when a large force is applied.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-precision superabrasive grindstone which has a high rigidity, is hard to be deformed, and can withstand high-speed rotation, and a method for manufacturing the same.

[0005]

In order to solve the above-mentioned problems, a superabrasive grain grindstone of the present invention comprises an abrasive grain layer having superabrasive grains such as CBN and diamond fixed to the outer surface thereof, and a core metal. A super-abrasive grain grindstone comprising a bonding layer between the core metal and the abrasive grain layer, wherein the bonding layer comprises filled particles and an adhesive that is impregnated between the particles and cured. It is characterized by being formed. Further, the particles filled in the bonding layer have a longitudinal elastic modulus larger than that of the adhesive, and the particles filled in the bonding layer are 40% to 85% by volume. It is characterized by being.

Further, the method of manufacturing a superabrasive grain grinding stone of the present invention comprises a step of arranging superabrasive grains such as CBN and diamond on the inner peripheral wall of the master die by a filling method, and the superabrasive grain on the inner peripheral wall of the master die by electroplating. A step of temporarily fixing the abrasive grains, a step of removing excess superabrasive grains that are not temporarily fixed, and a step of fixing the superabrasive grains covered with an electroformed layer until all the superabrasive grains by electroplating are covered, The step of inserting a core metal into the center of the mother die to which the superabrasive grains are fixed, the step of densely filling the particles between the core metal inserted into the center of the mother die, and the particle filling Supplying the adhesive from one side, impregnating the adhesive between the particles using negative pressure, curing the adhesive, and removing the matrix after the adhesive is cured, Is characterized in that

Furthermore, in the step of supplying the adhesive from one side filled with the particles and impregnating the adhesive between the particles using a negative pressure, the adhesive is adhered from the one side filled with the particles. It is characterized in that the agent is supplied and the particles are impregnated with the adhesive agent by vacuum suction from the other side.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The superabrasive grindstone of the present invention comprises an abrasive grain layer having superabrasive grains such as CBN and diamond fixed on the outer surface thereof, a core metal, and the core metal and the abrasive grain layer. A superabrasive grindstone consisting of a bonding layer between, the bonding layer, the particles filled,
Since it is formed by an adhesive that is impregnated between the particles and hardened, the bonding force between the abrasive grain layer and the core metal is strong, and it is possible to cope with high-speed rotation, and the particles are filled with the bonding layer. Therefore, the elastic deformation is small, the deformation of the superabrasive grindstone against a high load can be prevented, and highly accurate grinding work can be performed. Further, the superabrasive grindstone of the present invention, the particles filled in the bonding layer is characterized in that the longitudinal elastic modulus is larger than the adhesive, further, the particles filled in the bonding layer, Since it is characterized by being 40% to 85% in volume%, it is possible to prevent deformation of the superabrasive grindstone against a higher load, and it becomes possible to perform highly accurate grinding work.

Further, the method for producing a superabrasive grain grindstone of the present invention comprises a step of arranging superabrasive grains such as CBN and diamond on the inner peripheral wall of the master die by a filling method and the superabrasive grain on the inner peripheral wall of the master die by electroplating. A step of temporarily fixing the abrasive grains, a step of removing excess superabrasive grains that are not temporarily fixed, and a step of fixing the superabrasive grains covered with an electroformed layer until all the superabrasive grains by electroplating are covered, The step of inserting a core metal into the center of the mother die to which the superabrasive grains are fixed, the step of densely filling the particles between the core metal inserted into the center of the mother die, and the particle filling Supplying the adhesive from one side, impregnating the adhesive between the particles using negative pressure, curing the adhesive, and removing the matrix after the adhesive is cured, As a result, the bonding layer is composed of packed particles and
It is possible to easily manufacture the superabrasive grindstone formed by the adhesive impregnated between the particles by using a negative pressure. That is, even if the particles are densely packed in the bonding layer portion, the adhesive is impregnated by using the negative pressure, so that the adhesive is spread between the particles as necessary and sufficient, and the rigidity of the particles in the bonding layer is secured. It is possible to maintain a sufficient adhesive force. In addition, the step of supplying the adhesive from one side filled with the particles and impregnating the adhesive between the particles using a negative pressure includes supplying the adhesive from one side filled with the particles. The adhesive can be impregnated between the particles by vacuum suction from the other side, or pressure can be applied from the adhesive side.

The particles to be used must have a longitudinal elastic modulus larger than that of the adhesive, and metal particles, organic or inorganic material particles can be used. As the adhesive, for example, a phenol resin, a melamine resin, an epoxy resin, or the like can be used, and a two-pack type epoxy resin adhesive can be particularly preferably used.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As one example of the superabrasive grindstone of the present invention, a superabrasive grindstone using diamond abrasive grains as the superabrasive grains and a method for producing the same will be described. FIG. 1 is a sectional view of the superabrasive grindstone, and FIG. 2 is a sectional view showing a part of a manufacturing process of the superabrasive grindstone of one embodiment of the present invention.

FIG. 1 shows a cross-sectional view of a superabrasive grindstone according to an embodiment of the present invention, in which a hollow core metal 1 is provided at the center, and a bonding layer 2 is provided on the outer periphery of the metal core 1 on the outer peripheral surface. The abrasive grain layer 3 to which the diamond abrasive grains 4 are fixed is bonded. The bonding layer 2 is
It is composed of particles 5 densely packed and an adhesive 6 impregnated and cured between them.

Next, a method of manufacturing a superabrasive grindstone according to an embodiment of the present invention will be described. First, as in the conventional method, diamond abrasive grains are placed on the inner peripheral wall of the master die formed of a conductive material such as carbon by the filling method, and electroplated (such as nickel plating) on the inner peripheral wall of the master die. Temporarily fix the remaining diamond abrasive grains that have not been temporarily fixed, and then cover the diamond abrasive grains with the electroformed layer until all the diamond abrasive grains are covered by electroplating (nickel plating, etc.). Completely adheres to the peripheral surface. The state is the mother die 10 shown in FIG. 2, and the abrasive grain layer 3 is formed on the inner periphery thereof.

As described above, the abrasive grain layer 3 is formed on the inner periphery of the mother die 10.
2, the mother die 10 is formed on the upper surface of the vacuum work table 11 with the flanged core metal blank 1a constituting the core metal 1 of the superabrasive grindstone, as shown in FIG. The part 1b is placed face down and placed through the O-ring 13. With the core metal portion of the core metal blank 1a with a flange centered, the diamond layer-equipped mother die 10 formed in the above step is fitted,
It is placed on the upper surface of the flange portion 1b. Then, particles 5 (mullite beads: 3Al ₂ O ₃ .2SiO ₂ # 10) are provided between the cored bar portion and the abrasive grain layer 3 on the inner periphery of the mother die 10.
0 longitudinal elastic modulus 1 × 10 ⁶ kg / cm ² ) with a filling rate of 56%
Then, the upper surface thereof is filled with an adhesive (two-component epoxy resin adhesive, manufactured by Three Bond Co., viscosity 1500 cps, longitudinal elastic modulus 3 × 10 ⁴ kg / cm ² ). In that state, the inside of the vacuum workbench 11 is suctioned by a vacuum pump.
The particles started to be impregnated with the adhesive at a vacuum degree of about 300 torr, and suction was continued with a vacuum pump until the pressure became about 1 torr. The adhesive 6 filled on the upper surface is used for the vacuum work table 11
Is sucked through the suction hole 12 and the hole 1c formed in the flange portion 1b of the core metal blank 1a, and the particle portion becomes a negative pressure, and the adhesive 6 is uniformly impregnated between the particles 5. At this time, for vacuum suction, the center hole of the core metal blank 1a is closed by a cap 15 made of silicon rubber, and the hole 1c of the flange portion 1b is a small hole so that the particles 5 are not sucked. Suction of particles 5 was prevented by interposing a filter paper. A net-like material or the like can be used if necessary.

In this embodiment, mullite beads (3Al ₂ O ₃ .2SiO), which are inorganic material particles, are used as the particles 5.
₂ , # 100, longitudinal elastic modulus 1 × 10 ⁶ kg / cm ² ) was used and the filling rate was 56%.
Other metal particles, organic or inorganic material particles, etc. can be used. The filling rate depends on the particle size of the particles, but the filling rate is 40%.
Good results can be obtained when the content is from 85% to 85%.

After that, the adhesive is cured at 80 ° C. for 3 hours, the mother die 10 integrated with the core metal blank is removed from the vacuum work table, the mother die made of carbon is removed, and the core after that is removed. The gold blank 1a is set in a machining machine and both side surfaces of the core metal and the filler material are machined to shape the superabrasive grindstone as shown in FIG.

When a superabrasive grindstone having a diameter of 80 mmφ and a thickness of 15 mm was prepared by the above method and a rotary fracture test was conducted, the centrifugal fracture peripheral speed of the superabrasive grindstone of this example was 29.
It was 0 m / s. Further, when the same rotary fracture test was performed on the conventional electroformed superabrasive grindstone having the same shape, a centrifugal fracture peripheral velocity of 190 m / s was obtained.

Next, another embodiment for impregnating the adhesive 6 between the filled particles 5 in the method for manufacturing a superabrasive grindstone of the above embodiment of the present invention will be described. The example of FIG. 3A is an example using negative pressure. First, as shown in FIG. 3 (a1), the diamond layer-equipped mother die 10 formed in the previous step is fitted around the core metal part of the flanged core metal blank 1a in a vacuumed container, and the flange thereof is fitted. Particles 5 are filled between the core metal 1 and the abrasive grain layer 3 of the mother die 10 in a state of being placed on the upper surface, and the adhesive 6 is poured on the upper portion thereof.
In that state, the adhesive 6 does not immediately impregnate the spaces between the particles 5, but in that state, when exposed to atmospheric pressure as shown in FIG. The adhesive 6 is smoothly impregnated between the particles 5 by utilizing the pressure difference.

The example shown in FIG. 3B is also an example using negative pressure. In a state where the mother die 10 with the abrasive grain layer formed in the previous step is fitted around the cored bar portion of the cored bar blank 1a with the flange in atmospheric pressure, and the particle 5 is placed on the upper surface of the flange 1b, the cored particles 5 are attached. 1 and the abrasive grain layer 3 of the mother die 10 are filled, and the adhesive 6 is poured on the upper portion thereof. By applying pressure from the adhesive side in this state, the adhesive 6 is impregnated into the particles 5 by utilizing the pressure difference between the particles 5 and the upper portion of the adhesive 6.

The examples of FIGS. 3 (c) and 3 (d) are examples in which negative pressure is not used, and this method is suitable when an adhesive having a relatively low viscosity is used. In the example of FIG. 3C, the abrasive grain layer-provided mother die 10 formed in the previous step is fitted around the cored bar portion of the cored bar blank with flange 1a in atmospheric pressure and placed on the upper surface of the flange 1b. In this state, the particles 5 are filled between the core metal 1 and the diamond layer 3 of the matrix 10, and the adhesive 6 is poured on the upper part thereof. If the adhesive is left in that state for a certain period of time, the particles of the adhesive 5 can be removed by using gravity.
It is impregnated between them.

In the example of FIG. 3 (d), particles 5 are previously stored in another container.
The adhesive 7 in a mixed state is prepared in advance, and the mother die 10 with the abrasive grain layer formed in the previous step is fitted around the core metal part of the core metal blank 1a with a flange and mounted on the upper surface of the flange 1b. The adhesive 7 mixed with the particles 5 in another container is poured between the core metal 1 and the abrasive grain layer 3 of the matrix 10 in the placed state.

In the above embodiments, the superabrasive grindstone using diamond abrasive grains as the superabrasive grains and the manufacturing method thereof have been described. However, a superabrasive grain grindstone having CBN as the superabrasive grains can also be manufactured in the same manner. it can.

[0023]

The superabrasive grindstone of the present invention has C on its outer surface.
A superabrasive grain grindstone comprising an abrasive grain layer having superabrasive grains such as BN and diamond fixed thereto, a core metal, and a bonding layer between the core metal and the abrasive grain layer, wherein the bonding layer is filled. Since it is formed by the particles and the adhesive that is impregnated between the particles and cured, the bonding force between the abrasive grain layer and the cored bar is strong, and high-speed rotation is possible, and the bonding layer is filled. Since it is composed of particles, elastic deformation is small, deformation of the superabrasive grindstone against high load can be prevented, and highly accurate grinding work can be performed.

Further, according to the method for manufacturing a superabrasive grain grindstone of the present invention, a step of arranging superabrasive grains such as CBN or diamond on the inner peripheral wall of the master die by a filling method, and superimposing on the inner peripheral wall of the master die by electroplating. A step of temporarily fixing the abrasive grains, a step of removing excess superabrasive grains that are not temporarily fixed, a step of fixing the superabrasive grains covered with an electroformed layer until all the superabrasive grains are covered by electroplating, and The step of filling particles between the core metal inserted in the center of the matrix and the step of supplying the adhesive agent from one side filled with the particles and using negative pressure to impregnate the adhesive agent between the particles. And a method of manufacturing a superabrasive grindstone comprising a step of curing the adhesive and a step of removing the matrix after the adhesive is cured, so that the bonding layer is filled particles and between the particles. A superabrasive grindstone formed with an adhesive impregnated using negative pressure It can be produced in. That is, even if the bonding layer portion is densely filled with particles, the adhesive is impregnated by using the negative pressure, so that the adhesive is spread between the particles as necessary and sufficient, while ensuring the rigidity of the particles in the bonding layer. It is possible to maintain a sufficient adhesive force.

[Brief description of drawings]

FIG. 1 is a sectional view of a superabrasive grindstone according to one embodiment of the present invention.

FIG. 2 is a first step of manufacturing a superabrasive grindstone according to an embodiment of the present invention.
Sectional drawing which shows a part.

FIG. 3 is a sectional view showing another embodiment of a part of the manufacturing process of the superabrasive grindstone of the present invention.

[Explanation of symbols]

1: Core metal 1a: Metal core blank 1b: Flange of core metal blank 1c: Hole in core metal blank 2: Bonding layer 3: Abrasive layer 4: Diamond abrasive grains 5: Particle 6: Adhesive 10: Mother mold 11: Vacuum work table 12: Vacuum suction hole 13: O-ring

Continued front page    (72) Inventor Shinji Yanagisawa             1-54 Shiroyama, Maiki Town, Okazaki City, Aichi Prefecture Toyotaba             Inside Nmops Co., Ltd. (72) Inventor Tatsuo Fujii             1-54 Shiroyama, Maiki Town, Okazaki City, Aichi Prefecture Toyotaba             Inside Nmops Co., Ltd. (72) Inventor Masato Kitajima             1-54 Shiroyama, Maiki Town, Okazaki City, Aichi Prefecture Toyotaba             Inside Nmops Co., Ltd. (72) Inventor Akimitsu Kamiya             1-1 Asahi-cho, Kariya city, Aichi             Machine Co., Ltd. (72) Inventor Shinji Soma             1-1 Asahi-cho, Kariya city, Aichi             Machine Co., Ltd. F-term (reference) 3C063 AA02 AB03 BA02 BB02 BC02                       BG07 BH03 BH07 BH32 CC13                       CC17 CC22 FF11 FF23

Claims (5)

[Claims] 1. A superabrasive grain grinding wheel comprising an abrasive grain layer having superabrasive grains such as CBN and diamond fixed on its outer surface, a core metal, and a bonding layer between the core metal and the abrasive grain layer. The superabrasive grindstone, wherein the bonding layer is formed of filled particles and an adhesive which is impregnated between the particles and hardened. 2. The superabrasive grindstone according to claim 1, wherein the particles filled in the bonding layer have a longitudinal elastic modulus larger than that of the adhesive. 3. The particles packed in the bonding layer have a volume%
And 40% to 85% is the superabrasive grindstone according to claim 1. 4. A step of disposing super-abrasive grains such as CBN and diamond on the inner peripheral wall of the master die by a filling method, a step of temporarily fixing the super-abrasive grains on the inner peripheral wall of the mold by electroplating, and a temporary fixing step. A step of removing excess superabrasive particles that are not present, a step of fixing the superabrasive particles by electroplating until they are all covered by electroplating, and a step of fixing the superabrasive particles to the center of the mother die to which the superabrasive particles are fixed. A step of inserting a core metal, a step of closely packing particles between the core metal inserted in the center of the master mold, and supplying an adhesive from one side filled with the particles, and applying a negative pressure. Manufacture of a superabrasive grindstone characterized by comprising a step of impregnating an adhesive agent between particles by utilizing, a step of curing the adhesive agent, and a step of removing a matrix after the adhesive agent is cured. Method. 5. The step of supplying an adhesive agent from one side filled with the particles and impregnating the adhesive agent between the particles using a negative pressure is performed from the one side side filled with the particles. 5. The method for producing a superabrasive grindstone according to claim 4, wherein the adhesive is impregnated between the particles by vacuum suction from the other side.