JP2010052045A - Substrate for cup wheel, manufacturing method for the same, and cup hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a substrate of a cup wheel serving to grind a material to be ground formed of a hard and brittle material such as concrete or stone to keep stability during high-speed rotation, also reduce its weight to alleviate a burden of an operator, and in addition, can reduce manufacturing cost. <P>SOLUTION: In the substrate for the cup wheel, a recess having an attachment hole to a power tool is formed at the shaft center of the circular steel-made substrate, and an abrasive grain layer attachment area is formed on a flat surface extending from an outer edge of the recess to an outer peripheral end of the substrate. An area from a wall surface of the recess to approximately the center of the flat surface of the abrasive grain layer attachment area and a circumferential area from the shaft center of the substrate are longitudinally equally divided to form recessed ribs from a front face to a rear face. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a grinding tool that is suitably used when grinding work such as surface polishing on a work material made of hard and brittle materials such as various building materials such as concrete, stone, tiles, bricks, and castings. Is a grinding surface for high-precision grinding of natural stone typified by granite and marble, or artificial slabs (slab plates) including artificial marble, tiles, tiles, bricks, siding boards, etc. The present invention relates to a cup wheel having a diamond abrasive layer or a cBN abrasive layer attached thereto.

  In recent years, in addition to various natural stones and artificial marble (hereinafter sometimes simply referred to as “stone”) as a building material, many of the above-mentioned various hard materials have been adopted, and the work made of these hard materials has been adopted. As a surface grinding tool to accurately grind the surface of the material to the desired dimensions and shape, a bowl-shaped (cup-shaped) is formed in the peripheral part of the mounting hole to the power tool formed on the axis of the circular steel substrate. ), And the outer flat surface excluding the recessed portion is used as an abrasive layer attaching region, and a diamond layer or a cBN abrasive grain as a main component is provided in the region continuously or intermittently. Cup wheels attached to are widely used. These cup wheels are usually fastened to the spindle of a hand-held rotary power tool such as a grinder or sander by fitting the mounting hole in a state orthogonal to the spindle axis and used for manual operations such as surface grinding. However, when grinding a workpiece with a power tool that rotates at high speed, to avoid the difficulty of work and the health hazard to the worker caused by the vibration, to the spindle of the cup wheel As a fastening means, many proposals have been made, including a dry surfacer (see, for example, Patent Document 1) using a buffer material made of a special metal member and a cushion material.

For example, it becomes the abrasive layer attachment area of the substrate for the purpose of efficiently discharging chips generated during grinding work to obtain a good working environment and a precision ground surface for the work material. A through hole for dust collection is provided on the inclined surface between the flat surface and the mounting hole for the electric tool, and the front side of the substrate (the inner side of the substrate) and the back side of the substrate (the outer side of the substrate) In addition to a cup-type grindstone (for example, see Patent Document 2) in which a specific recess is formed in each of the two, and a forced air flow is generated as the grindstone rotates to increase the chip discharging ability, When attaching an abrasive grain layer to the grain layer attachment region by laser welding, a hole that penetrates in the thickness direction of the substrate is formed in the outer peripheral edge of the substrate to which the abrasive grain layer is joined as a means to realize strong joining And the outer periphery where the abrasive layer contacts the outer periphery of the substrate and the hole portion, respectively. Laser welding is performed to increase the number of welds in the width direction of the abrasive layer and to make the thermal effect uniform between the center and the periphery of the abrasive layer, thereby strengthening the substrate and the abrasive layer. A cup-type grindstone (for example, see Patent Document 3) that realizes bonding has been proposed.
JP 2000-326197 A JP 2003-103469 A JP 2003-225870 A

  In each of the above prior arts, in the dry surfacer proposed in Patent Document 1, the vibration of the cup wheel during high-speed rotation during the grinding operation is effectively suppressed by the action of the buffer ring used. According to the type grindstone, chips generated by the grinding operation are smoothly discharged, and according to the method for bonding the abrasive layer of Patent Document 3, a strong bonding between the substrate and the abrasive layer is realized. The goal has been achieved. However, in each of the prior arts described above, a steel substrate that is usually formed into a cup shape is cut into a cup shape by mechanical means such as a lathe, for example, from a steel material made of a solid material (mug material). Since it is formed by processing, there is a problem that the processing efficiency is difficult and the material cost is high and the substrate itself is expensive. On the other hand, as a means for improving the above cost, a steel flat plate Although it has been proposed for a substrate formed into a cup shape by pressing, it is not possible to secure sufficient resistance to centrifugal force caused by high-speed rotation, and there is a concern that plastic deformation may occur. Therefore, strength is maintained by giving a certain thickness to the steel substrate, but as a result, the weight of the cup wheel itself increases and grinding work is performed. On the burden on the operator is increased in and remains a problem on the accuracy of the finish of the grinding surface inviting camera shake, issue the desired urgently resolved had been left.

  Accordingly, an object of the present invention is to reduce the weight of the cup wheel while maintaining the stability at the time of high-speed rotation in a cup wheel used for grinding work of hard and brittle materials such as concrete and stone. It is to reduce the manufacturing cost.

  The present invention is intended to solve the above-mentioned problems in the cup wheel, and reduces the burden on the operator by reducing the weight while maintaining the stability of the cup wheel during high-speed rotation. At the same time, in order to reduce the manufacturing cost, various studies have been made focusing on improving the shape of the substrate itself and improving the processing means. By providing a reinforcing rib at a portion that reaches the substantially central portion of the flat surface of the grain layer attachment region, and mainly adopting a molding process by a press as a processing method of the substrate including the rib forming means. The present invention was completed by finding that the manufacturing process is greatly simplified.

  That is, the present invention solves the above-described conventional problems, and a recess having a mounting hole for the electric power tool is formed in the shaft center of the circular steel substrate, and the outer periphery of the substrate is formed from the outer end of the recess. In a cup wheel substrate in which an abrasive layer attachment region is provided on a flat surface reaching an end portion, from the wall surface of the recess to a substantially central portion of the flat surface of the abrasive layer attachment region and from the axis of the substrate A cup wheel substrate is provided in which the circumferential direction is divided equally and concave ribs are formed from the front surface to the back surface.

  In addition, the present invention provides the cup wheel substrate, wherein the rib is provided in a range of 2 to 16.

  The present invention also provides the cup wheel substrate, wherein a punched hole is provided in an abrasive layer attachment region between the rib and the adjacent rib.

  In addition, the present invention has a predetermined depth and outer diameter by providing a mounting hole to the electric power tool in the center of the circular steel substrate material and forming the peripheral portion of the mounting hole by pressing. A recess is formed, an abrasive layer attachment region is formed on a flat surface extending from an outer end of the recess to the outer peripheral end of the substrate, and a flat surface of the abrasive layer attachment region is formed from the wall surface of the recess. The cup wheel substrate manufacturing method is characterized in that a concave rib is formed from the front surface to the back surface by dividing the circumferential direction equally from the axial center of the substrate into the vertical direction. is there.

  The present invention also provides a method for producing the cup wheel substrate, wherein the ribs are provided in a range of 2 to 16 rows.

  In addition, the present invention provides a method for manufacturing the cup wheel substrate, wherein a punch hole is provided in an abrasive layer attachment region between the rib and the adjacent rib.

  Further, according to the present invention, the circular steel substrate material, the mounting hole to the electric tool provided at the axis of the substrate material, and the punched hole provided in the abrasive layer attaching region are each punched by a press. The present invention provides a method for producing the cup wheel substrate.

  Further, the present invention is obtained by attaching abrasive grains directly to the flat surface portion of the abrasive layer attachment region of the cup wheel substrate via a segment type and / or rim type abrasive layer or a binder. The cup wheel characterized by the above is provided.

  The present invention also provides the cup wheel, wherein the means for attaching the abrasive layer is any one of brazing, welding, electrodeposition, welding, and vacuum brazing.

  In addition, the present invention provides the cup wheel, wherein the abrasive layer is an abrasive layer mainly composed of diamond abrasive grains or cBN abrasive grains.

  The cup wheel substrate according to the present invention extends from a wall surface of a cup-shaped (substantially bowl-shaped) recess in a circular steel substrate to a flat surface reaching almost the center of the abrasive layer attachment region reaching the outer peripheral edge of the substrate, and By dividing the circumferential direction equally from the axis of the substrate and forming concave ribs from the front to the back, the substrate strength is remarkably improved and the thickness of the substrate is made extremely thin. Thus, the weight of the cup wheel after attaching the abrasive layer can be kept extremely low. In addition, since the main processing means is a press forming process, the manufacturing method of the substrate is extremely simple, greatly reducing processing costs, and adopting a steel flat plate as a material. The cost of the substrate itself can be greatly reduced in combination with the reduction of the material cost compared to the machining from the entity. The abrasive layer attachment region of the cup wheel substrate of the present invention thus obtained is attached to the rim type or segment type, or an appropriate combination of both, or the abrasive layer attachment. A cup wheel according to the present invention can be obtained by directly attaching abrasive grains to a region via a binder. An operator who is engaged in grinding work on a work material using the cup wheel can reduce the weight of the cup wheel. As a result, the burden is greatly reduced, camera shake is effectively suppressed, work can be continued efficiently and stably, and a finished surface with excellent accuracy can be obtained. Further, the cup wheel according to the present invention has a large surface area due to the ribs provided on the substrate, the cooling effect is increased, and the grinding performance as a cup wheel is further improved. Furthermore, by ensuring the substrate strength by the ribs, it is possible to appropriately provide a punch hole in the abrasive layer attachment region of the substrate, further contributing to the weight reduction of the substrate and at the same time releasing the provided punch hole. In addition to the cooling effect, it effectively contributes to chip discharge.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in more detail with reference to the accompanying drawings and embodiments. However, the present invention is not limited thereto and can be freely performed within the scope of the gist of the present invention. Design changes are possible.

  A cup wheel substrate according to a first embodiment of the present invention will be described with reference to FIGS. 1 is a front view of the cup wheel substrate of this example, FIG. 2 is a rear view thereof, FIG. 3 is a plan view thereof, and FIG. 4A is an end view taken along line XX of FIG. B) is an end view taken along line YY in FIG. In the present specification, “front” or “front” refers to the abrasive layer attachment side, and “back” refers to the opposite side.

  The cup wheel substrate 1 is formed with a cup-shaped recess 3 having a mounting hole 4 for a power tool at the center of a circular steel substrate 110, and from the outer end 14 of the recess 3 to the outer peripheral end 12 of the substrate. An abrasive layer attachment region 111 is provided on the flat surface 11 to reach.

  That is, the concave portion 3 is composed of a substantially cylindrical wall portion 32 having a slightly reduced diameter on the back surface side and a flat bottom portion 33 having a mounting hole 4 on the back surface side. The connecting portion between the wall portion 32 and the bottom portion 33 is rounded. And from the inclined wall surface 32 of the concave portion 3 to the substantially central portion of the flat surface 11 of the abrasive layer attaching region 111 and from the axial center of the substrate 110, the circumferential direction is equally divided into a plurality of portions from the front surface to the back surface. In this example, eight semi-oval concave ribs 2 are formed. The concave portion 21 of the rib 2 appears when viewed from the abrasive layer attachment region 111 side as shown in FIG. 1, and the rib 2 appears as a convex surface 22 when viewed from the back side of FIG. 2. The tip position of the rib 2 on the axial core side may be anywhere on the wall surface 32, but the effect of the rib 2 is remarkable when it is in the vicinity of the end portion 13 on the back surface side of the wall surface 32 as in this example. It is desirable in that it can be demonstrated.

  In the cup wheel substrate of the present invention, the number of the concave ribs 2 is appropriately selected within the range of 2 to 16, preferably 4 to 12. A single rib 2 does not provide a sufficient reinforcing effect, and if it is 17 or more, the abrasive layer attachment region 111 is limited and the processing cost increases, which is not desirable. The depth and width w of portions other than the rounded portions at both ends of the concave rib 2 are appropriately selected between a depth of 1 to 4 mm and a width of 2 to 8 mm. Further, the convex height of the rib 2 appearing on the back surface of the substrate, that is, the height h protruding from the concave surface is about 1 to 4 mm.

  By providing the plurality of semi-elliptical concave ribs 2, the strength of the substrate 110 is improved, and the area of the substrate is increased to increase the heat dissipation effect. Further, by dividing the rib 2 equally from the axis of the substrate 110 in the circumferential direction, the balance in the rotation direction can be maintained.

  In the cup wheel substrate of the present invention, the wall surface 32 of the recess 3 is not limited to the inclined shape as in this example, and may be a vertical wall or a round wall.

  The cup wheel substrate 1 is usually formed by punching a steel plate having a thickness of 1.5 to 3.5 mm, and a disk-shaped steel having an outer diameter of 90 to 180 mm having an attachment hole 4 for a power tool in the axial center portion. A substrate-making material is produced, and then a peripheral portion of the mounting hole 4 is subjected to a pressing process to form a cup-shaped recess 4 having a predetermined depth and outer diameter, and an outer end of the recess 4 The abrasive grain layer attachment region 111 is formed on the flat surface 11 extending from the outer peripheral end 12 of the substrate 110 to the substantially central portion of the flat surface 11 of the abrasive grain layer attachment region 111 from the wall surface 32 of the recess 4 and the substrate. It can be obtained by a method in which the circumferential direction is equally divided from the axial center of 110 and the concave ribs 2 are formed from the front surface to the back surface by molding using a press.

  In the method for manufacturing a cup wheel substrate according to the present invention, a plurality of semi-elliptical circles reaching a substantially central portion of the abrasive layer attachment region from the wall surface of the recess and the formation of a recess around the mounting hole for the circular steel substrate. The rib may be formed by two-stage molding in which the former press molding is performed first and then the latter press molding is performed, or in one-stage molding in which the recess and the rib are simultaneously molded. By simultaneously forming the recess and the rib, the manufacturing process can be further simplified. Furthermore, in forming by these presses according to the present invention, it is optional to adopt a predetermined cold working method or to perform mechanical processing to correct distortion caused by the processing.

  A cup wheel substrate according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a front view of the cup wheel substrate of this example. In FIG. 5, the same components as those in FIG. That is, FIG. 5 is different from FIG. 1 in that a through hole 15 penetrating the substrate 110 is formed between the rib 2 and the adjacent rib 2. In other words, in the cup wheel substrate 1a of the present example, a pair of ribs composed of the ribs 2 and the ribs 2 adjacent to the ribs 2 are selected, and four punched holes 15 are formed. Providing the punched holes 15 in the substrate 110 further contributes to the weight reduction of the substrate, and at the same time, the provided punched holes effectively contribute to the discharge of chips in addition to the cooling effect.

  In the cup wheel substrate 1a of the present invention, the punched holes 15 may be formed between the ribs 2 and the ribs 2 adjacent thereto. Further, the shape, number and size of the punched holes 15 are not particularly limited, but it is desirable to preferentially consider the strength of the substrate 110 and securing the area as the abrasive layer attaching region 111. In addition, it is preferable that the plurality of punch holes 15 be formed by dividing the circumferential direction into equal parts from the axial center in order to balance the circumferential direction. The punching hole 15 is formed by punching with a press, but may be formed at the same time when the mounting hole 4 of the recess 3 is formed.

  A cup wheel according to an embodiment of the present invention will be described with reference to FIGS. 6 is a front view of the cup wheel of this example, FIG. 7 is a plan view thereof, FIG. 8 is a front view of the cup wheel in another embodiment, and FIG. 9 is a plan view thereof. 6 to 9, the same components as those in FIG. 5 are denoted by the same reference numerals, and the description thereof will be omitted and different points will be mainly described. That is, FIG. 6 to FIG. 9 are different from FIG. 5 in that the abrasive layer attachment region 111 of the cup wheel substrate 1a obtained as described above mainly contains diamond abrasive grains or cBN abrasive grains. It is in the point which attached the abrasive grain layer 6, or the point which joined the diamond abrasive grain or the cBN abrasive grain.

  The cup wheel 10 shown in FIGS. 6 and 7 is a segment type in which the abrasive layer 6 is intermittently attached to the abrasive layer attachment region 111 of the substrate 110. May be attached in appropriate combinations. The cup wheel 10a shown in FIGS. 8 and 9 is directly connected to the diamond layer through a binder made of a low-melting-point metal or the like in the abrasive layer attaching region 111 excluding the concave portion 21 and the through hole 15 of the rib 2 of the substrate 110. Abrasive grains or cBN abrasive grains 6a are joined.

  In the cup wheel of the present invention, the abrasive grains and the abrasive layer structure as described above can be appropriately selected according to the purpose and application of the grinding process on the work material. 10 is that the strength of the substrate 110 is remarkably improved by the action of the ribs 2 formed on the substrate 110, thereby making it possible to extremely reduce the thickness of the substrate 110. As a result, the weight of the substrate itself is significantly reduced. The weight of the cup wheel itself is reduced, and the burden on the worker who is engaged in the grinding work by using this is greatly reduced at the same time.

  In the cup wheel of the present invention, the means for joining the abrasive layer to the cup wheel substrate does not deny adopting a conventionally known method as appropriate, such as welding or brazing, as long as both are firmly fixed. However, in the case of a segment type cup wheel, superabrasive grains made of diamond abrasive grains and cBN abrasive grains, and various bond matrices made of cobalt, bronze, iron, nickel, tungsten carbide or various mixtures thereof, and various binders The so-called simultaneous sintering method, in which the formation of the kneaded abrasive layer at a predetermined mixing ratio and the bonding of the abrasive layer to the steel substrate at the same time, is adopted to reduce the manufacturing cost by simplifying the process. It is desirable to reduce and to ensure stable product quality, and when directly attaching the abrasive layer to the abrasive layer attachment area of the substrate, various binders are used. It is desirable in ensuring the simplification of the process, a stable bonding for bonding the to electrodeposition.

  By punching a steel plate material having a plate thickness of 2.3 mm, a disk-shaped steel substrate material having an outer diameter of 98 mm and an attachment hole having an inner diameter of 15 mm in the shaft center was obtained. Next, by forming the steel substrate material by pressing the periphery of the mounting hole, a cup-shaped (substantially bowl-shaped) recess having an inclined wall surface as shown in FIGS. 1 to 4 was formed. The concave portion has a depth of 11.7 mm from the front surface to the bottom portion of the substrate, an outer diameter of 51 mm viewed from the back surface, and a connection portion between the bottom portion and the inclined surface is a round shape, and the bottom portion is connected to the inclined surface. The effective plane had a flat surface with a diameter of 32 mm or more between the mounting holes. When the electric power tool is attached to the spindle of the electric power tool, the flat surface of the bottom portion ensures a uniform and strong fastening when the effective plane is φ32 mm or more.

  By the press forming process, a cup wheel substrate was formed in which the front surface of the flat surface reaching the outer peripheral edge of the substrate material excluding the concave portion formed in the vicinity of the shaft center was the abrasive layer attachment region. Next, the substrate is further subjected to press forming, and is flattened from the wall surface of the cup-shaped recess formed around the axis to the substantially central portion of the abrasive layer attachment region of the substrate. From the front to the back of the surface, as shown in FIGS. 1 to 4, the circumferential direction is divided into eight equal parts from the axis of the disk-shaped steel substrate to form ribs consisting of eight rows of semi-oval concave portions. did.

  As shown in FIG. 1, the rib viewed from the front surface of the substrate has a tip extending in the axial direction starting from the vicinity of the outer end of the recess formed around the axis of the substrate, and the outer end of the rib is outside the bottom. And the tip extending in the outer circumferential direction reaches the substantially central portion of the abrasive layer attachment region, and is formed as a semi-oval recess having an average depth of 2 mm, and conversely the back surface of the substrate As shown in FIGS. 2 and 3, the rib as viewed from FIG. 2 was formed as a bowl-shaped semi-ellipsoidal convex surface.

  The cup wheel substrate according to this example obtained in this manner was attached to the abrasive layer attachment region excluding the ribs formed on the substrate according to the purpose. Thus, it is provided as a cup wheel for surface grinding, and the thickness of the substrate is 2.3 mm as described above, and the usual thickness of the same type of cup wheel substrate on the market is 3.1 mm. Compared to the above, it was confirmed that the weight as the cup wheel was reduced by about 30% in the same manner since it was about 30% thinner.

  As shown in FIG. 5, a cup wheel substrate was obtained in the same manner as in Example 1 except that four punched holes were provided in the abrasive layer attachment region excluding the ribs formed on the substrate. The holes provided in the substrate are through-holes having a hole diameter of 12 mm by dividing the circumferential direction into four equal parts from the axis of the substrate between the ribs in the eight rows formed in the abrasive layer attachment region. It was confirmed that the weight of the substrate according to this example was further reduced by about 5% by the four punched holes, and the weight of the cup wheel using this was also reduced proportionally.

  In the cup wheel substrate obtained in Example 2, an abrasive layer having a thickness of 4.5 mm mainly composed of diamond abrasive grains was brazed to the abrasive layer attaching region excluding ribs and punched holes. The segment type cup wheel was obtained as shown in FIGS. As a result of subjecting the obtained cup wheel to surface grinding work of a slab plate made of artificial marble, the sharpness and life peculiar to the segment type cup wheel was greatly improved by the thickness of the bonded abrasive layer. In spite of this, the weight of the substrate 1a is greatly suppressed by the light weight of the substrate 1a, and the rib formed on the substrate compensates for the decrease in strength of the substrate, so that it is stable even in grinding work with high-speed rotation. Rotation was maintained, reducing the burden on workers involved in grinding work and ensuring a good finish on the ground surface. In addition, the rib increases the area of the substrate, and the heat-cooling effect is effectively hindered by the air cooling effect provided by the punched holes formed in the substrate, the sharpness of the grindstone surface is maintained for a long time, and the The punched holes contributed to the discharge of chips and maintained a good finish on the ground surface. As described above, the segment type cup wheel obtained by the present embodiment makes it possible to further increase the thickness of the abrasive grain layer to be joined by reducing the weight of the substrate, effectively suppressing heat storage and reducing the amount of the work material. It was confirmed that a sharp grinding surface with high precision was obtained by maintaining a sharp sharpness over a long period of time and improving the discharge of chips.

  In the cup wheel substrate obtained in Example 2, the abrasive layer attachment region excluding the ribs and the punched holes is composed of diamond abrasive grains by electrodeposition through a binder mainly composed of low melting point metal powder. An abrasive layer was attached to obtain an offset type cup wheel as shown in FIGS. As a result of using the obtained cup wheel for surface grinding work on a work material made of artificial marble similar to that of Example 3, the biting of the abrasive layer and the sharpness of the work material were the same as in Example 3 above. Although it does not reach the cup wheel, it was confirmed that the ground surface was almost mirror-finished, and surface grinding work with excellent precision was ensured. In addition, it was confirmed that the cup wheel by a present Example is also lightweight, and heat dissipation and the discharge | emission of a chip are ensured in the favorable state, and it has contributed enough to ensuring the lifetime as a grindstone, and a favorable finishing surface.

  The cup wheel substrate in the present invention uses a plate material having a predetermined plate thickness usually made of carbon tool steel, and circular (disk-shaped) steel by punching the plate member using a predetermined mold. In the present invention, since the plate thickness of the steel plate material used can be significantly reduced, at the time of forming the circular steel substrate material, a shaft mounting hole and a through hole are simultaneously formed. It is also possible to form the substrate, which can further simplify the process for forming the substrate.

  Further, the processing means in the method for manufacturing a cup wheel substrate according to the present invention mainly adopts a forming process by pressing by reducing the plate thickness of the steel plate used as the substrate, thereby manufacturing the substrate. It is possible to simplify the process and greatly improve the manufacturing cost.

  As described in detail above, the cup wheel substrate according to the present invention maintains its strength at a high level by the ribs formed by a plurality of semi-oval concave portions formed on the substrate, and greatly increases the thickness of the steel plate as a material. Since the thickness can be reduced, the weight of the obtained cup wheel can be further reduced. In addition, the ribs that are formed increase the substrate area, and the heat dissipation effect maintains the life and sharpness of the grindstone over a long period of time, greatly reducing the burden on workers involved in grinding work, and immature workers Even so, it is possible to easily obtain a good finished surface. Furthermore, by reducing the thickness of the steel sheet, it is possible to mainly adopt press forming as a substrate processing means, so that the manufacturing process can be simplified and significant cost reductions can be realized. Expected to be adopted.

It is a front view of the substrate for cup wheels in a 1st embodiment. It is a rear view of FIG. It is a top view of FIG. (A) is the end view seen along the XX line of FIG. 1, (B) is the end view seen along the YY line of FIG. It is a front view on the cup wheel substrate in the second embodiment. It is a front view of the cup wheel of this example. FIG. 7 is a plan view of FIG. 6. It is a front view of the cup wheel in other forms. It is a top view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Cup wheel board | substrate 2 Rib 3 Cup-shaped recessed part 4 Mounting hole 6, 6a Abrasive grain layer 10, 10a Cup wheel 12 Outer peripheral edge part 21 Semi-circular circular recessed part 22 Convex surface 31 Outer edge part 32 Wall surface 33 Bottom part 111 Abrasive layer attachment area

Claims (10)

  A cup in which a recess having a mounting hole for an electric power tool is formed in the center of a circular steel substrate, and an abrasive layer attachment region is provided on a flat surface extending from the outer end of the recess to the outer peripheral end of the substrate. In the wheel substrate, a concave rib extending from the wall surface of the recess to the substantially central portion of the flat surface of the abrasive layer attachment region and from the front axis to the back surface, with the circumferential direction divided equally from the axis of the substrate. A cup wheel substrate, characterized in that is formed.   The said rib is provided in the range of 2-16, The board | substrate for cupwheels of Claim 1 characterized by the above-mentioned.   The cup wheel substrate according to claim 1, wherein a punched hole is provided in an abrasive layer attachment region between the rib and the adjacent rib.   While providing a mounting hole to the electric power tool in the center of the circular steel substrate material, and forming a press working on the peripheral portion of the mounting hole to form a recess having a predetermined depth and outer diameter, Forming an abrasive layer attachment region on a flat surface extending from the outer end of the recess to the outer peripheral end of the substrate, and extending from the wall surface of the recess to a substantially central portion of the flat surface of the abrasive layer attachment region; A method for manufacturing a cup wheel substrate, characterized in that the circumferential direction is divided equally from the axis of the substrate in the vertical direction, and a concave rib is formed from the front surface to the back surface.   The said rib is provided in the range of 2-16 rows, The manufacturing method of the board | substrate for cupwheels of Claim 4 characterized by the above-mentioned.   6. The method for manufacturing a cup wheel substrate according to claim 4, wherein a punch hole is provided in an abrasive layer attachment region between the rib and the adjacent rib. The circular steel substrate material, the mounting hole for the electric power tool provided at the axis of the substrate material, and the punched hole provided in the abrasive layer attaching region are each made by punching with a press. The manufacturing method of the board | substrate for cup wheels of Claim 6.   It is obtained by attaching abrasive grains directly to the flat surface portion of the abrasive layer attachment region of the cup wheel substrate according to claim 1 through a segment type and / or rim type abrasive layer or a binder. Cup wheel characterized by that.   The cup wheel according to claim 8, wherein the means for attaching the abrasive layer is any one of brazing, welding, electrodeposition, welding, and vacuum brazing.   The cup wheel according to claim 8 or 9, wherein the abrasive layer is an abrasive layer mainly composed of diamond abrasive grains or cBN abrasive grains.

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