JP2005205588A - Elastic offset grinding wheel, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic grinding wheel which is flexible and suitable for grinding a curved surface, and to provide an elastic offset grinding wheel which is capable of compatibly realizing flexibility and the grinding speed, long in lifetime, less in noise and vibration, and excellent in grinding speed. <P>SOLUTION: In an elastic offset grinding wheel in which blend of abrasive grains with binder or the like blended in abrasive grains is compressed, molded and baked, abrasive grains and elastic powder of powder rubber or the like are blended in the blend of abrasive grains to form a surface of at least a grinding unit, and elastic powder of powder rubber or the like is blended in solid powder forming abrasive grains or reinforcing agent similar to abrasive grains in the abrasive grain blend to form an offset part at a center of the offset grinding wheel with the blending ratio larger than that of the abrasive grain blend to form the grinding unit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an offset grinding wheel, and more particularly to an offset grinding wheel having elasticity by blending an abrasive such as rubber with abrasive grains and a method for manufacturing the same.

  Conventional offset whetstones are manufactured by compressing and molding abrasive grains made of silicon carbide, gold and sand, etc. together with a binder into a disk shape, then curing the binder by heat treatment, and integrally molding it. Since it has almost no property, it is not suitable for curved surface grinding and polishing, and a sanding wheel made of disc-shaped sandpaper is used for curved surface polishing and the like.

  In addition, in order to give a little flexibility to the conventional offset grinding wheel with high rigidity, after the offset grinding wheel is made thin, it is bent forcibly, causing many cracks in the disk part used for grinding. A method of imparting flexibility has been performed.

  In addition, in the Japanese Patent Application No. Hei 6-280062 (Japanese Patent Application Laid-Open No. 8-118240), the present inventor compression-molds and burns an abrasive compound comprising an abrasive compounded with a binder or the like into a disk shape. The grinding wheel has corrugated irregularities on one side of the grinding wheel, and the corrugation has a number of crest lines extending in a substantially radial direction from the center to the outer periphery of the grinding wheel. An offset grinding wheel having a corrugated shape in which the shape of the surface of the grinding wheel in a cross section along a concentric circle concentric with the center of the wavy is disclosed.

  Further, the present inventor disclosed in Japanese Patent Application No. 9-338200 (Japanese Patent Application Laid-Open No. 11-156729) a superabrasive grain having elasticity, in which an elastic substance powder such as rubber is blended with an abrasive grain composition constituting an offset grinding wheel. A grinding wheel provided with a grinding wheel has been disclosed.

  The conventional offset grinding wheel has high rigidity and is not suitable for curved surface grinding. When grinding a flat surface, only the circumferential part of the offset grinding wheel slides on the surface of the work piece, so the flat surface is uniform. It is difficult to grind. Furthermore, when grinding with a conventional offset grinding wheel with high rigidity, the noise and vibration during work are extremely large, the work environment is bad, noise pollution occurs around the work area, and vibration causes white wax to the worker. There is a risk of ill health.

  Even if it is forced to bend the offset grinding wheel with high rigidity to cause cracks on the disc part to give it flexibility, it is difficult to give enough flexibility to grind the curved surface. In order to give more flexibility, it is necessary to reduce the number of reinforcing glass fiber cloths embedded in the offset grinding wheel to 1 or 2 at most, and the cracked offset grinding wheel is easily chipped during use. The durability is small, and the broken pieces of grindstone are scattered and the danger is extremely high.

  Conventional sanding wheels that use disk-shaped sandpaper, etc., can grind curved surfaces, but sandpaper wears in a short period of time, has a short life, requires frequent replacement, poor work efficiency, and grinding There is a drawback that costs increase.

  The present inventor has already disclosed an elastic powder such as rubber in an abrasive compound that constitutes an offset grinding wheel provided with a superabrasive grindstone disclosed in Japanese Patent Application No. 9-338200 (Japanese Patent Laid-Open No. 11-156729). The offset grinding wheel with blended elasticity is uniformly blended with powder rubber etc. throughout the offset grinding wheel, but in this case both grinding force by super abrasive grindstone and flexibility by blending powder rubber etc. are exhibited. The flexibility of the grinding wheel and the grinding speed were compatible. However, if a superabrasive grindstone is not provided, and powder rubber is simply blended with normal abrasive grains and evenly distributed throughout the grinding wheel, the rigidity and grinding force required for the grinding part and powder rubber blend The flexibility due to is not always compatible, and if the blending amount of powdered rubber or the like is excessively increased in order to increase flexibility, the grinding speed decreases.

  Accordingly, an object of the present invention is to provide an elastic grinding wheel having flexibility and suitable for curved grinding. It is another object of the present invention to provide an elastic offset grinding wheel that has both flexibility and grinding speed, has a long life, generates less noise and vibration, and has an excellent grinding speed.

  In order to achieve the above-mentioned object, the present inventor has conducted earnest research, and as a result, in the offset grinding wheel using abrasive grains such as silicon carbide used in ordinary grinding wheels, using abrasive grains blended with powder rubber, By molding part or all of the grinding wheel, a flexible offset grinding wheel blended with rubber can be obtained. The flexible offset grinding wheel blended with rubber is suitable for curved grinding, offset By providing a difference in the blending amount of the powder rubber depending on each part of the grinding wheel, it is possible to achieve both the flexibility of the grinding wheel as a whole and the grinding speed of the grinding surface, and the flexible offset grinding wheel blended with rubber is It has been found that it has a very long life and can increase the grinding speed by forming irregularities on the grinding surface of the grinding wheel. In addition, the offset grinding wheel containing rubber has extremely low noise and vibration generated during the grinding operation, and there is no risk of the grinding wheel being chipped off during the grinding operation, which greatly improves the grinding work environment. Therefore, the present invention was completed by finding out that it is extremely suitable for surface grinding.

  That is, in an abrasive grinding wheel formed by compression-molding and firing an abrasive composition obtained by blending a binder or the like with abrasive grains, the abrasive grains and powder in the abrasive composition that forms at least the surface of the grinding part In addition to blending elastic powder such as rubber, the abrasive compound that forms the offset portion of the center portion of the offset grinding wheel has a solid powder serving as a reinforcing agent equivalent to the abrasive grain or abrasive grain. The gist of the present invention is an elastic offset grinding wheel characterized in that the powder is blended in a larger blending ratio than the abrasive blend that forms the grinding part.

  Another embodiment of the present invention is an abrasive comprising an abrasive powder in which a binder is mixed between an upper mold and a lower mold in a cylinder that is fitted so that a disc-shaped lower mold is fitted to the bottom and the axis is vertical. In a manufacturing method of a grinding wheel that heats and fires the disk-shaped molded product after being pressed into a disk shape by pressing at high pressure with the grain compound interposed therebetween, a grinding portion of the periphery of the upper surface of the lower mold in the cylinder In the part to be molded, an abrasive compound composed of an elastic powder such as powder rubber is deposited to a certain thickness to form an abrasive layer, and the offset part at the center of the upper surface of the lower mold is formed The elastic powder, such as powder rubber, is blended in a larger proportion than the abrasive composition of the part forming the grinding part into solid powder that becomes a reinforcing material equivalent to abrasive grains or abrasive grains to a constant thickness An abrasive composition is disposed, a glass fiber reinforced cloth is disposed thereon, and further on the abrasive composition forming the ground portion, the back surface of the ground portion An abrasive compound containing an elastic powder such as powder rubber that forms the base part to be formed is placed, and the elastic powder is further added to the part that forms the offset part at the center of the mold. The gist of the present invention is a method for producing an elastic offset grinding wheel characterized in that a blend of abrasive grains blended in a larger amount than that of the product is arranged and the whole is pressure-molded integrally.

  Yet another aspect of the present invention is a method for forming an abrasive wheel of an offset grinding wheel in a manufacturing method of an offset grinding wheel by pressing and firing an abrasive compound in which an abrasive powder is blended with an elastic powder such as powder rubber. Powder that forms only the part in advance, installs the grinding part in the pressure molding die, and forms the base part that is in close contact with the offset part at the center of the offset grinding wheel and the back surface of the grinding part The gist of the manufacturing method of an elastic offset grinding wheel is characterized in that an abrasive compound containing elastic powder such as rubber is arranged, the whole is integrally pressure-molded, and then the whole is fired.

  According to another aspect of the present invention, in a method for manufacturing an offset grinding wheel, an abrasive composition in which an abrasive powder is blended with an elastic powder such as powder rubber is pressure-molded and fired to form a grinding surface of the offset grinding wheel. Only the grinding part is pre-manufactured. On the other hand, the abrasive grains compounded with an elastic powder such as powder rubber is pressed and fired, and the part of the offset grinding wheel is manufactured separately. Then, the gist of the manufacturing method of the elastic offset grinding wheel characterized by bonding the two together.

  Next, the contents of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of an example of the elastic offset grinding wheel of the present invention, FIG. 2 is a sectional view taken along the line AA, and FIG. 3 is an enlarged sectional view taken along the arc BB. Reference numeral 1 denotes a grinding portion of the elastic offset grinding wheel 2, which is formed by blending powder rubber with abrasive grains such as silicon carbide similar to a known grinding wheel.

  Reference numeral 3 denotes a base portion 3 of the elastic offset grinding wheel 2, which is disposed on the back surface of the grinding portion 1 and is formed by blending more powder rubber than the grinding portion 1 with abrasive grains, etc., to enhance flexibility. It supports and reinforces the grinding part 1 which is thin and has relatively high rigidity. Depending on the case, the powder rubber compounding amount of the grinding part 1 and the base part 3 may be the same.

  The offset portion 4 at the center of the offset grinding wheel is formed by blending a larger amount of powdered rubber with abrasive grains than the grinding portion 1 and is formed with high flexibility. The offset part 4 mix | blends the powder rubber equivalent to or more than the base part 3 with an abrasive grain.

  A plurality of glass fiber reinforced cloths 5 are embedded in the elastic offset grinding wheel 2 in the same manner as a normal offset grinding wheel. In the example of FIG. 2, the glass fiber reinforced cloth 5 is disposed for one sheet near the boundary between the grinding part 1 and the base part 3, inside the base part 3, and near the back surface of the base part 3. There is no restriction | limiting in particular in the number of arrangement | positioning of the cloth 5, and an arrangement | positioning position, It can change and arrange | position as needed. When the number of sheets is increased, the safety is improved, but the rigidity is increased and the flexibility is decreased. Therefore, the flexibility can be adjusted by the blending amount of the powder rubber and the number of the glass fiber reinforcing cloths 5 disposed.

  The surface 6 of the grinding part 1 of the elastic offset grinding wheel of the present invention may be planar, but it is desirable to provide irregularities in order to increase the grinding speed. Concavity and convexity are a method of providing a grid, radial, or annular groove on the surface, either alone or in combination. A conventionally known shape such as a method of arranging a large number of protrusions is used.

  In order to increase the flexibility of the grinding part 1 of the elastic offset grinding wheel of the present invention, it is preferable to make the grinding part 1 and the base part 3 relatively thin. For example, as shown in the cross-sectional view of FIG. 4, grooves 19 are provided on the surface of the grinding part 1 to form irregularities, and the total thickness of the grinding part 1 and the base part 3 can be as thin as 2 to 3 mm. .

  Further, in the example of FIG. 2, wavefront lines 7 extend radially on the surface 6 of the elastic offset grinding wheel 2, and corrugated 8 irregularities in which a section along a concentric circle forms a sawtooth wave are provided. It is preferable that the slanted surface of the sawtooth wave faces the front in the rotational direction of the grinding wheel and the steep surface of the sawtooth wave faces the rear in the rotational direction, but it can also be provided so as to face in the opposite direction. The number of radial waves of the wave type 8 is not particularly limited, but a wave number of 10 to 100 is used depending on the diameter of the grinding wheel and the purpose of use. For example, a wave number of 15 to 50 is preferably used for the elastic offset grinding wheel 2 having a diameter of 100 mm.

  In order to manufacture the elastic offset grinding wheel of the present invention, the elastic offset grinding wheel 2 is entirely disposed with an abrasive composition in which the compounding ratio of abrasive grains and powder rubber is partially changed, and the glass fiber reinforced cloth 5 is sandwiched therebetween. A method in which the pressure part is integrally molded and fired, and only the grinding part 1 is formed and fired in the shape of a donut board, while the base part 3 and the offset part 4 are integrally molded and fired to produce both. , The grinding part 1 only is molded and fired, placed in a mold, and the abrasive composition is disposed on the part to be the base part 3 and the offset part 4 on the mold, and then added together. A method of firing after pressure forming can be used.

  The method of integrally molding and firing the entire elastic offset grinding wheel of the present invention is, for example, when the elastic offset grinding wheel 2 shown in FIGS. 1 to 3 is molded, as shown in the sectional view of FIG. 9 and a lower die 10 having a radial wave shape on the upper surface and an upper die 11 having a lower surface having a shape obtained by inverting the back surface of the elastic offset grinding wheel 2 are used. A central hole 13 through which the pin 12 is inserted is provided at the center of each of the lower mold 10 and the upper mold 11.

  The lower die 10 is fitted to the bottom of the cylindrical outer die 9 of this die, and a thin abrasive composition 14a for the grinding portion 1 to be described later is put into a disk-like portion to be the grinding portion 1 thereon, and the center portion The abrasive composition 14b for the offset part 4 is put in the part to be the offset part 4, and the whole is made to a certain depth. On the abrasive grain layer 15, a molding plate whose bottom center is recessed in a U-shape is rotated and filled so that the center of the upper face of the abrasive grain layer 15 is chevron, and the glass fiber reinforcing cloth 5 is placed thereon. Then, in the same manner, the abrasive compound 14c for the base portion 3 is placed at a certain depth in the portion that becomes the peripheral disk-shaped base portion 3 and offset to the portion that becomes the offset portion 4 in the center portion. The abrasive composition 14b for the part 4 is put, the glass fiber reinforcing cloth 5 is stacked on the abrasive layer 16, the upper mold 11 is pressed on, and the pressure is applied by a hydraulic press device. If necessary, one or two more glass fiber reinforcing cloths 5 may be sandwiched between the abrasive grain layer 15 and the abrasive grain layer 16 and pressed.

  As the abrasive grains used in the production of the elastic offset grinding wheel of the present invention, known grinding wheel abrasive grains such as silicon carbide, alumina, zirconia, and gold sand can be used. As the powder rubber, natural rubber or synthetic rubber powder can be used, and elastic synthetic resin powder such as polyurethane resin can be used in place of the powder rubber. As the synthetic rubber powder rubber, SBR, NBR, and any other known synthetic rubber powder can be used. These powder rubbers are known in the art, such as those obtained by spray-drying rubber latex, polymerized by emulsion polymerization, suspension polymerization, solution polymerization, etc., and then crushed and classified by the pulverization method after the rubber obtained by coagulation and drying. Powdered rubber is used.

  The particle diameter of the powder rubber is not particularly limited, but those having an average particle diameter of about 50 to 1000 μm are preferably used, and 50 to 300 μm is preferably used. Those having an average particle diameter larger than 1000 μm and those smaller than 50 μm can also be used.

  In the abrasive compound 14a for the grinding part 1, the mixing ratio of the abrasive grains and the powder rubber is preferably 10 parts by weight or more and 30 parts by weight or less with respect to 100 parts by weight of the abrasive grains. If the weight is less than 10 parts by weight, the grinding part 1 has low flexibility and is easily cracked when the offset grinding wheel is bent. If it is larger than 30 parts by weight, the rigidity of the grinding part 1 becomes small, and the grinding speed decreases.

  The compounding ratio between the abrasive grains 14c for the base portion 3 and the powder rubber is preferably 20 parts by weight or more, more preferably 100 parts by weight or more with respect to 100 parts by weight of the abrasive grains. The upper limit of the compounding ratio of the powder rubber is 700 parts by weight or less, and 400 parts by weight or less is more preferable. When the compounding ratio of the powder rubber is small, the elasticity and flexibility of the base portion 3 are small, and sufficient flexibility cannot be obtained. If the blending ratio of the powder rubber of the base part 3 is too large, the base part 3 becomes too soft and the strength is reduced, and the grinding part 1 cannot be pressed against the workpiece with sufficient pressure during grinding. The grinding speed decreases.

  A reinforcing agent made of hard solid particles other than abrasive grains and particles having the same size as the abrasive grains may be blended in place of the abrasive grains blended in the abrasive blend 14c for the base portion 3. The action of the abrasive compounded in the abrasive compound 14c for the base part 3 is mainly necessary for satisfying the mechanical strength and flexibility of the base part 3 obtained by press-molding and firing the same. This is because it acts as a strong reinforcing material and does not require grinding action of abrasive grains. However, since the abrasive composition 14c for the base portion 3 may be diffused and mixed in the grinding portion 1 during the pressure forming of the base portion 3, it is preferable to use the same abrasive grains.

  The compounding ratio of the abrasive grains 14b of the offset portion 4 to the powder rubber is preferably 100 parts by weight of powder rubber or more than 100 parts by weight of the abrasive grains. The upper limit of the compounding ratio of the powder rubber is 700 parts by weight or less, and 400 parts by weight or less is more preferable. When the blending ratio of the powder rubber is small, the flexibility of the elastic offset grinding wheel 2 as a whole becomes small, and sufficient ability as an elastic offset grinding wheel cannot be exhibited. If the blending ratio of the powder rubber in the offset portion 4 is too large, the entire elastic offset grinding wheel 2 becomes too soft and a sufficient grinding force cannot be exhibited. For the same reason as in the case of the abrasive blend 14c for the base portion 3, hard particles other than abrasive grains are used as a reinforcing material instead of the abrasive blended in the abrasive blend 14b for the offset portion 4. However, it is preferable to use the same abrasive grains as those used for the grinding part 1 as a reinforcing material.

  Each of the above-mentioned abrasive blends 14a, 14b, and 14c is blended with a mixture of abrasive grains and powder rubber with a liquid phenolic resin such as a resol type or a benzylic ether type and a powdery phenol resin as a binder. 14 The blending ratio is suitably 10 to 30 parts by weight, and more preferably 15 to 25 parts by weight with respect to 100 parts by weight of the mixture of abrasive grains and powder rubber. Increasing the compounding ratio of the binder increases the rigidity, and decreasing it decreases the rigidity. When the blending ratio of the binder is less than 10 parts by weight, the strength of the part is lowered. When the blending ratio of the binder is more than 30 parts by weight, the part becomes too hard and the flexibility is lowered.

  An organic solvent or other liquid fluidity modifier can be further added to the abrasive blend 14. In addition, additives such as cryolite, calcium carbonate and other powder fillers, coloring agents, and the like that are added to the abrasive grains in the production of a normal grinding wheel can be appropriately added.

Although the pressure which presses the abrasive compound 14 with a die is not particularly limited, 100 to 150 kgf / cm ² is usually used. The press temperature is a normal press temperature of 80 to 100 ° C.

  Thus, the firing temperature of the abrasive grain molded body formed into a disk shape needs to be lower by about 50 ° C. than the firing temperature of a grinding wheel made of only ordinary abrasive grains, depending on the type and blending ratio of the powder rubber. It is necessary to adjust the firing temperature. Generally, when the compounding ratio of the powder rubber is small, the firing temperature can be made relatively high. However, when the compounding ratio of the powder rubber is large, it is necessary to lower the firing temperature in consideration of the heat resistance of the powder rubber. There is. When the entire elastic offset grinding wheel 2 of the present invention is fired, the firing temperature usually used is 140 to 150 ° C. and is fired for about 24 hours. The temperature is gradually raised from room temperature to around 140 ° C. in the first 14 hours, and then kept at 140 to 150 ° C. for about 10 hours, and then gradually cooled.

  Only the donut plate-shaped grinding part 1 is separately molded and fired at a firing temperature of 160 to 170 ° C. Thus, if only the grinding part 1 having a small blending ratio of the powder rubber is separately fired, the firing temperature can be made relatively high, the bond strength of the abrasive grains in the grinding part 1 can be increased, and the grinding wheel Durability can be increased.

  In the method in which the once molded and fired grinding part 1 is pressure-molded integrally with other parts and fired, the fired grinding part 1 is placed on the lower mold 10 of the molding die shown in FIG. The abrasive composition 14b of the offset part 4 is thinly put in the center, and further, the glass fiber reinforcing cloth 5, the abrasive composition 14c for the base part 3, and the abrasive composition 14b for the offset part 4 are the same as described above. And the whole is pressure-molded integrally, and then the whole is integrally fired at a firing temperature of 140 to 150 ° C.

  When the elastic offset grinding wheel of the present invention is manufactured, since powdered rubber is blended with the abrasive blend 16, when the abrasive blend 16 blended with rubber is placed on the reinforcing cloth 17, glass fiber is pressed when pressed. It is possible to prevent the fiber from being cut due to excessive stress applied to the fiber.

  Instead of firing the grinding part 1 previously molded and fired as described above together with the abrasive blends 14b and 14c constituting the other parts of the elastic offset grinding wheel 2 and firing, the base part 3 and Only the offset part 4 may be integrally pressure-molded and fired, and the ground part 1 that is separately molded and fired may be bonded together with an adhesive or the like. Also, instead of molding and baking the base part 3 and the offset part 4 from the abrasive blends 14b and 14c, the base part 3 and the offset part 4 are molded integrally with an elastic synthetic resin such as rubber or polyurethane resin. The grinding part 1 that is separately molded and fired may be bonded to this.

  Superabrasives such as diamond abrasives, cubic boron nitride (CBN) abrasives, tungsten carbide abrasives can be used as the abrasives used in the grinding part 1 of the elastic offset grinding wheel of the present invention. The superabrasive grains can be disposed only on a part of the grinding part 1, and a superabrasive chip in which the superabrasive grains are bonded by a known bonding method such as metal bond, vitrified bond, resinoid bond, etc. You may embed so that a part may be exposed to the surface 6. FIG.

  The elastic offset grinding wheel of the present invention is used not only for an offset grinding wheel of a normal shape but also for an offset grinding wheel having a deep depth of the offset portion 4, which is called a cup-shaped grinding wheel having a cross-sectional shape as shown in FIG. In this specification, “elastic offset grinding wheel” is defined and used as a term including “elastic cup-shaped grinding wheel”. In this elastic cup-shaped grinding wheel 17, since the nut for fixing the grinding wheel to the rotating shaft does not protrude from the grinding surface 18 during use, the entire grinding surface 18 can be ground in close contact with the surface of the object to be ground. By blending powder rubber with the abrasive grains, the grinding wheel has elasticity and can be ground with low noise and low vibration.

The invention's effect

  According to the elastic offset grinding wheel of the present invention, the grinding wheel has flexibility and is suitable for curved squeezing and polishing. By providing irregularities on the surface 6 of the grinding part 1 of the elastic offset grinding wheel 2, clogging of the surface 6 of the grinding part 1 can be prevented, and the cutting speed is greatly improved.

  According to the flexible elastic offset grinding wheel 2 of the present invention, noise during grinding is greatly reduced, vibration is greatly reduced, and the working environment is improved.

  Even if a plurality of glass fiber reinforcing cloths 5 are embedded inside the elastic offset grinding wheel, elasticity and flexibility can be maintained, and flexibility can be maintained without causing cracks in the grinding wheel. There is no possibility that the grinding wheel breaks during the grinding operation and the fragments are scattered, and the safety is extremely high. Since the glass fiber reinforced cloth 5 is embedded in the abrasive compound 14 containing powder rubber and press-molded, the glass fiber reinforced cloth 5 which is likely to occur during pressure molding of a normal grinding wheel is not cut, and the glass fiber is not cut. As a result of embedding the reinforcing cloth 5 in a complete state, safety is further enhanced.

  According to the elastic offset grinding wheel of the present invention, a grinding wheel having a very long life can be obtained as compared with a sanding wheel using a conventional sandpaper.

  When the grinding part 1 of the elastic offset grinding wheel of the present invention is previously molded and fired separately from the other parts, the grinding part 1 can be fired at a higher temperature than the other parts having a high powder rubber compounding ratio. Strength can be increased and durability can be increased.

  The top view of an example of the elastic offset grinding wheel of the present invention   AA sectional view of an example of the elastic offset grinding wheel of the present invention   Sectional drawing which follows circular arc BB of an example of the elastic offset grinding wheel of this invention   Sectional drawing of the other example of the elastic offset grinding wheel of this invention   Sectional drawing explaining an example of the manufacturing method of the elastic offset grinding wheel of this invention   Sectional drawing of an example of the cup-shaped elastic offset grinding wheel of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grinding part 2 Elastic offset grinding wheel 3 Base part 4 Offset part 5 Glass fiber reinforced cloth 6 Surface 7 Wave front line 8 Wave form 9 Cylindrical outer mold 10 Lower mold 11 Upper mold 12 Pin 13 Center hole 14 Abrasive compound 15 16 Abrasive layer 17 Cup type grinding wheel 18 Grinding surface 19 Groove

Claims (13)

Compression molding an abrasive compounded with an abrasive compounded with a binder,
In an offset grinding wheel formed by firing, at least the abrasive composition that forms the surface of the grinding part is blended with elastic powder such as abrasive grains and powder rubber, and the offset part at the center of the offset grinding wheel is formed. In the abrasive composition to be blended, an elastic powder such as powder rubber or the like was added to the solid powder serving as a reinforcing agent equivalent to the abrasive grain or the abrasive grain at a larger blending ratio than the abrasive composition forming the grinding part. An elastic offset grinding wheel characterized by   The abrasive compound that forms the base portion formed on the back surface of the grinding portion of the offset grinding wheel is an abrasive powder or an elastic powder such as powder rubber or the like that becomes a reinforcing agent equivalent to the abrasive grain, and the grinding portion The elastic offset grinding wheel according to claim 1, blended at a blending ratio equal to or higher than that of the abrasive grain blend to be formed.   An abrasive compound containing elastic powder such as powder rubber at a predetermined compounding ratio is disposed on the grinding part, the offset part and the base part of the offset grinding wheel with a glass fiber reinforcing cloth interposed therebetween, and the whole The elastic offset grinding wheel according to claim 1, wherein the elastic offset grinding wheel is integrally formed by pressure and fired.   Abrasive compound containing powdered rubber blended with abrasive grains is pressure-molded, fired and pre-manufactured in advance, together with the abrasive compound that constitutes the offset part and the base part, and pressure-molded together. The elastic offset grinding wheel according to claim 1 or 2, which is fired.   The elastic offset grinding wheel according to claim 1, 2, 3, or 4, wherein irregularities are provided on a surface of the grinding portion.   The surface of the grinding portion has corrugated irregularities, and the corrugation is a concentric circle in which a number of wave front lines extend in a substantially radial direction from the central portion of the grinding wheel toward the outer peripheral portion and concentric with the center of the grinding wheel. The elastic offset grinding wheel according to claim 1, 2, 3, 4 or 5, wherein the shape of the grinding wheel surface in a cross section along the shape of the grinding wheel has a wave shape.   The blending ratio of the elastic powder of the abrasive compound forming the grinding part is 10 to 30 parts by weight of the elastic powder with respect to 100 parts by weight of the abrasive grains. The described elastic offset grinding wheel.   The abrasive composition for forming the offset portion is obtained by blending the elastic powder into abrasive grains or the like at a blending ratio of 100 to 700 parts by weight with respect to 100 parts by weight of the abrasive grains or the like. The elastic offset grinding wheel according to 4 or 5.   The elastic offset grinding wheel according to claim 1 or 2, wherein the offset grinding wheel is a cup-type offset grinding wheel.   The abrasive composition for forming the grinding portion is blended with superabrasive grains such as diamond abrasive grains, cubic boron nitride (CBN) abrasive grains, tungsten carbide abrasive grains, and the like. 7. An elastic offset grinding wheel according to claim 7 or 8.   A disc-shaped lower mold is fitted to the bottom and an abrasive compound composed of an abrasive powder with a binder mixed between the upper mold and the lower mold in a cylinder installed so that the axis is vertical. In a grinding wheel manufacturing method in which a disk-shaped molded product is heated and fired after being pressed into a disk shape by pressing at a high pressure, the grinding portion at the periphery of the upper surface of the lower mold is fixed to the portion to be molded in the cylinder. The abrasive grains are formed by blending an elastic powder such as powder rubber into the abrasive grains to form an abrasive grain layer, and a constant thickness is formed in the portion forming the offset portion at the center of the upper surface of the lower mold. In addition, an abrasive composition in which an elastic powder such as powdered rubber is mixed with a solid powder that is a reinforcing material equivalent to abrasive grains or an abrasive grain at a compounding ratio larger than the abrasive composition of the part forming the grinding part is disposed. And a glass fiber reinforced cloth is disposed thereon, and on the abrasive compound that forms the grinding portion, a belt formed on the back surface of the grinding portion. An abrasive compound containing elastic powder such as powder rubber that forms the mold part is placed, and the elastic powder is further added to the part forming the offset part at the center of the mold than the abrasive compound of the grinding part. A method for producing an elastic offset grinding wheel, characterized in that a large amount of a blend of abrasive grains is arranged and the whole is pressure-molded integrally.   In the manufacturing method of the offset grinding wheel, the abrasive compound containing elastic powder such as powder rubber is pressure-molded and fired, and only the grinding part constituting the grinding surface of the offset grinding wheel is manufactured in advance. The grinding part is installed in a pressure molding die, and this is blended with an elastic powder such as powder rubber, which forms an offset part at the center of the offset grinding wheel and a base part in close contact with the back surface of the grinding part. A method for producing an elastic offset grinding wheel, comprising: arranging an abrasive composition, press-molding the whole, and then firing the whole.   In the manufacturing method of the offset grinding wheel, the abrasive compound containing elastic powder such as powder rubber is pressure-molded and fired, and only the grinding part constituting the grinding surface of the offset grinding wheel is manufactured in advance. On the other hand, an abrasive compound containing elastic powder such as powder rubber and the like is pressure-molded and fired, and the part other than the grinding part of the offset grinding wheel is separately manufactured, and both are bonded together. A method of manufacturing an elastic offset grinding wheel characterized by the above.

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