JP2010042475A - Cup type rotary tool and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cup type rotary tool which can easily be lightened in weight while maintaining the strength thereof during use, and of which the types of stocked parts can be reduced. <P>SOLUTION: A cup type rotary tool 20 is used mounted on a drive shaft by mounting means, the drive shaft being disposed inside a dustproofing cover provided on a rotary driving mechanism. The cup type rotary tool 20 includes a recess portion protrudently molded at a center portion of a disk-shaped substrate formed of carbon steel, a cutting tip 23 anchored along the circumference of the substrate, and an annular boss member 25 integrally secured by communicating a communication hole with a mounting hole on a flat surface of the protrudently molded recess portion of the substrate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cup-type rotary tool in which a central portion of a disk-shaped substrate is protruded and a method for manufacturing a cup-type rotary tool.

  2. Description of the Related Art Conventionally, many rotary tools such as cutters and sanders are known in which a cutting blade, a grinding blade, or the like is fixed to a peripheral edge of a circular substrate and attached to a drive shaft of a rotary drive mechanism to be driven to rotate. . The rotary tool includes a flat rotary tool in which a chip is fixed to the peripheral edge of a flat plate-shaped substrate, and a cup-type rotary tool in which a chip is fixed to the peripheral edge of the substrate protruding from the center (for example, See Patent Documents 1 and 2 below). The cup-type rotary tool can be fitted with a nut or the like that is fixed to the drive shaft of the rotary drive mechanism inside the protruding part at the center, so the entire bottom surface of the rotary tool must be close to the machining surface and the surrounding surface. Therefore, it is possible to work efficiently on the processability of the corner portion and a wide processing surface.

  In order to manufacture such a cup-type rotary tool, as shown in FIGS. 6A to 6D, a soft iron plate material 70 is formed on a disk-shaped substrate 71 and is machined to the center of the substrate 71. The mounting hole 72 is formed and a groove 73 and the like are formed at the periphery, and then the powder that becomes the chip 74 is temporarily fixed at a predetermined position on the periphery of the substrate by cold pressing. And the chip | tip 74 is integrally fixed to the board | substrate 71 by sintering operation. Here, the bond between the substrate and the chip is formed by integral sintering, but brazing or laser welding may be used. The substrate 71 is offset by cold pressing.

Japanese Patent No. 3634794 Japanese Patent No. 4009278

However, such a cup-type rotary tool has the following problems.
In the cup-type rotary tool, the center part of the substrate must be offset. In that case, it is common to perform cold pressing, and it is manufactured using soft iron having excellent bending workability. Therefore, in order to ensure strength during use, it is necessary to form a substrate thicker than a flat type rotary tool, which is likely to be heavier than a flat type rotary tool, and is a burden on the user and rotary drive mechanism during use. Was easy to grow.

  Moreover, when both the flat type rotary tool and the cup type rotary tool are stocked by the manufacturer, they are stocked in the state of the substrate on which the chip is not fixed. However, the flat type rotary tool and the cup type rotary tool have different materials. Therefore, substrates having different shapes and different plate thicknesses must be stocked, and the types of stock increase. Therefore, a configuration that can cope with a small number of types has been desired.

  Accordingly, the present invention has been made in view of the above problems, and it is easy to reduce the weight while securing strength during use, and a cup-type rotary tool and a cup-type rotary tool that can reduce the type of stock. It is an object to provide a manufacturing method.

  In order to solve the above-mentioned problems, a cup-type rotary tool is used by being attached to a drive shaft installed inside a safety cover provided in a rotary drive mechanism by an attachment means, and is a disk-shaped disk made of carbon steel. A cup-type rotary tool having a recess formed in a central portion of a substrate, wherein a communicating hole is communicated with the chip fixed to the periphery of the substrate and the flat surface of the recess formed by protrusion of the substrate. And an annular boss member fixed integrally therewith, and the concave portion is formed so as to protrude into a hole depth to be accommodated up to the end side of the attachment means attached to the drive shaft.

  According to such a configuration, the cup-type rotary tool is made of carbon steel, and the cup-type rotary tool with the center portion of the circular substrate protruding is made of carbon steel. Easy to plan. Moreover, since the cup-type rotary tool has the annular boss member fixed integrally to the protruding central portion of the substrate, the protruding height of the substrate in the mounting hole of the substrate can be reduced by the thickness of the spacer. . Therefore, it is possible to reduce the amount of protruding substrate made of carbon steel that is difficult to deform, and it is easy to manufacture. In addition, the cup-type rotary tool has a workability because the mounting member is housed in the recess even when the substrate is flat with respect to the workpiece, even when the cutter or grindstone is configured. Also excellent.

  Further, in the cup-type rotary tool described above, the annular boss member may be integrally fixed to the substrate via a sintered material at a position where the communication hole communicates with the mounting hole.

  According to such a configuration, the cup-type rotary tool can perform the fixing of the annular boss member, the fixing of the chip, and the processing of the substrate at the same time by hot pressing, and the accuracy of the mounting hole of the substrate by the hot pressing can be improved. Even if it is lowered, the accuracy can be ensured by the communication hole of the annular boss member, so that it is easy to manufacture, and a good operation of the cup-type rotary tool is possible at the time of use.

  Further, in the cup-type rotary tool described above, the annular boss member is formed on the substrate in a state where the communication hole is communicated with the mounting hole of the substrate after the substrate is formed by protruding the central portion by hot pressing. This is a fixed configuration.

  According to such a configuration, since the spacer is fixed after the substrate is hot pressed on the cup-type rotary tool, the heat and stress of the hot press are not applied to the communication hole of the spacer, and the accuracy is improved. It can be manufactured satisfactorily, and the cup-type rotary tool can be operated well in use.

Furthermore, in the cup-type rotary tool described above, the annular boss member may be formed of a sintered material.
By configuring in this way, the cup-type rotary tool can be combined with cutting tips arranged on the periphery of the substrate in one step when performing offset processing for projecting the substrate by hot pressing, for example. Can be manufactured.

  Moreover, in order to solve the said subject, the manufacturing method of a cup type rotary tool is used by attaching to the drive shaft of a rotational drive mechanism, and it is formed with carbon steel, and the recessed part which the center part of the disk-shaped board | substrate protruded In the manufacturing method of the cup-type rotary tool comprising: a first step of forming a mounting hole to be attached to the drive shaft of the rotary drive mechanism in the center of the substrate by machining; and a cutting tip by cold pressing on the periphery of the substrate In a state where the second step of temporarily fixing the ring and the annular annular boss member having a communication hole communicating with the mounting hole of the substrate are arranged facing each other through a sintered material on a plane around the mounting hole, The substrate is heated by an intermediate press to form a recess in the central portion of the substrate, and the chip is integrally fixed to the periphery of the substrate during the hot pressing, and the annular boss member is fixed to the central portion of the substrate. Together It is the third step of the constant, the procedure for.

  According to such a procedure, since the central portion of the substrate is projected by hot pressing, the substrate made of carbon steel that is difficult to deform can be projected without being damaged. At this time, since the annular boss member is interposed when the substrate is protruded by hot pressing, the protruding amount corresponding to the height of the annular boss member can be reduced. Further, by simultaneously sintering the chip and projecting the substrate, the number of manufacturing steps can be reduced and manufacturing is easy. In addition, since the annular spacer having the communication hole is fixed by projecting the substrate by hot pressing, the accuracy of the communication hole is less likely to be lower than the mounting hole provided directly on the substrate. As a result, the substrate of the cup-type rotary tool can be formed thin with carbon steel in the same manner as the flat-type rotary tool, and it is easy to reduce the weight of the cup-type rotary tool while ensuring the strength during use. It can be shared with the substrate of the flat type rotary tool, and the types of inventory can be reduced.

In the cup-type rotary tool according to the present invention, since the substrate is formed of carbon steel, it is easy to reduce the weight while securing the strength during use, and the types of inventory can be reduced.
According to the method for manufacturing a cup-type rotary tool according to the present invention, the cutting tip, the annular ring, and the substrate can be formed in a single process, and the number of processes can be reduced. At the same time, since the substrate is protruded through the annular ring, the amount of protrusion of the substrate can be reduced, and deterioration due to processing of the substrate can be minimized.

[First Embodiment]
The best mode for carrying out the present invention will be described below with reference to the drawings.
1A and 1B are diagrams illustrating a main part of a processing apparatus equipped with a cup-type rotary tool, wherein FIG. 1A is a plan view of the processing apparatus, and FIG. 1B is a cross-sectional view schematically illustrating an attachment shaft position of the processing apparatus. 2A and 2B show a cup-type rotary tool, in which FIG. 2A is an exploded perspective view when a portion of the annular boss member is removed, and FIG. 2B is a perspective view of a state where the annular boss member is fixed.

<Processing equipment>
As shown in FIG. 1, the processing apparatus 10 includes a rotation drive mechanism 11, a cup-type rotary tool 20 attached to a drive shaft 15 of the rotation drive mechanism 11 by an attachment bolt (attachment means) 17, and the rotation drive mechanism 11. And a safety cover 13 provided.

  The drive shaft 15 of the rotary drive mechanism 11 is installed inside the safety cover 13 and includes a positioning portion 15a of the cup-type rotary tool 20 and a female screw 15b. The mounting bolt 17 is inserted into the drive shaft 15 from the other end face 20b side of the cup-type rotary tool 20 with the end face 20a of the cup-type rotary tool 20 in contact with the positioning portion 15a, and screwed into the female screw 15b. The cup type rotary tool 20 is attached by combining. Further, as shown in FIG. 1B, the distance L from the upper wall 13a of the safety cover 13 to the position base portion 15a that is the lower end of the drive shaft 15 is a predetermined distance h from the lower end of the side wall 13b of the safety cover. It is set to be upward.

<Safety cover>
Here, the safety cover 13 is fixed to the rotational drive mechanism 11 so as to cover approximately half the circumference of the cup-type rotary tool 20, and an upper wall 13a that covers and separates the half surface of the cup-type rotary tool 20; The side wall 13b which covers the outer periphery of the cup-type rotary tool 20 so as to be spaced apart is provided. 1B, the distance H from the lower surface of the upper wall 13a of the safety cover 13 to the lower end of the side wall 13b is longer than the lower end of the drive shaft 15, as shown in FIG. Is set.

<Cup type rotary tool>
As shown in FIG. 2, the cup-type rotary tool 20 includes a disk-shaped substrate 21, a cutting tip 23 fixed to the periphery of the substrate 21, and an annular boss member 25 fixed to the center portion of the substrate 21. Is provided.

  The substrate 21 is made of carbon steel, and a protruding portion (concave portion) 27 protruding to one side is formed in the central portion. The protrusion 27 includes an attachment hole 29 through which the attachment bolt 17 can be inserted, and a flat surface 31 formed around the attachment hole 29. On the back side of the projecting portion 27, a recess 33 is formed in which a bolt head (end side of the mounting means) 17b that is a projecting portion of the mounting bolt 17 is housed, and the periphery of the mounting hole 29 is a cup-type rotary tool. The other end surface 20b of 20 is comprised. A plurality of grooves 35 are formed in the radial direction on the peripheral edge of the substrate 21, and the cutting tips 23 are arranged at equal intervals on the peripheral edge of the substrate between the adjacent grooves 35. In addition, the raw material of the board | substrate 21 is carbon steel, for example, carbon steel for machine structures, such as SKS material, S25C material, or S45C material, SK material, etc. are used. And although the thickness of the board | substrate 21 is based also on tool size (diameter), it is comprised in the range of 0.8-3.0 mm.

  The projecting portion 27 at the center of the substrate 21 is formed with a portion of the flat surface 31 having a size substantially equal to the outer diameter of the annular boss member 25 described later. Further, as shown in FIG. 1B, the protrusion amount (offset amount) h2 of the protrusion 27 from the substrate plane portion is 100% of the total height h3 combined with the thickness h1 of the annular boss member 25 described later. In some cases, the height is set in the range of 20% to 80%. In addition, when the board | substrate 21 is for cutters, the whole height h3 is comprised in the height which becomes inside from the lower end of the side wall 13b of the safety cover 13, and when the board | substrate 21 is for grindstones, The safety cover 13 is configured to have a height outside the lower end of the side wall 13b. If the ratio of the protruding amount of the protruding portion 27 is less than 20% of the total height h3 (the protruding amount is small), the bolt head 17b is housed inside and cannot be fixed so as not to protrude below the plane portion. There is a case. If the ratio of the protruding amount of the protruding portion 27 exceeds 80% of the total height h3, the bending amount increases when the substrate 21 is processed, the load applied to the substrate increases, and the thickness of the substrate 21 cannot be reduced. .

  The annular boss member 25 has a communication hole 37 penetrating in the thickness direction in the center, and is firmly fixed to the flat surface 31 of the protruding portion 27 of the substrate 21 by, for example, a sintered ring 39. A through hole 41 penetrating in the thickness direction is also provided at the center of the sintered ring 39, and the communication hole 37 of the annular boss member 25 is attached to the mounting hole of the substrate 21 through the through hole 41 of the sintered ring 39. 29 communicates. As will be described later, the annular boss member 25 may be fixed in the process of projecting the substrate 21 or may be configured to be fixed to the substrate 21 after the substrate 21 is projecting. .

  Further, the annular boss member 25 has a thickness h1 from the substrate 21 of 80% corresponding to the protrusion amount h2 when the height h3 combined with the protrusion height h2 of the protrusion 27 is 10%. To 20% of the range. When the thickness h1 of the annular boss member 25 is greater than 80%, the protruding height h2 of the protruding portion 27 of the substrate 21 decreases, and a height that can accommodate the bolt head 17b can be secured. Disappear. When the thickness h1 of the annular boss member 25 is less than 20%, the protrusion height h2 of the substrate 21 increases, and the protrusion amount (bending amount) increases when the substrate 21 is processed. End up. That is, here, if one of the protrusion amount h2 or the thickness h1 of the annular boss member 25 is determined, the other is also determined.

  Further, the annular boss member 25 is configured to fix a metal material formed in an annular shape in advance through a sintered ring 39, or to form a powdery material such as a sintered metal into an annular shape by cold pressing. It may be configured to be formed integrally with the substrate in a ring shape by sintering from a temporarily formed state by hot pressing. The annular boss member 25 has an advantage of reducing the number of manufacturing steps by being integrally fixed to the substrate 21 in accordance with the projecting molding of the substrate 21. The annular boss member 25 may be configured to be integrally fixed to the substrate 21 by laser welding, spot welding, or the like after the substrate 21 is formed by projecting to form the protruding portion 27.

  In this cup-type rotary tool 20, since the state where the chip 23 serving as a cutter is integrally fixed for cutting is shown here, as shown in FIG. 1B, the drive shaft 15 of the rotary drive mechanism 11 is shown. In the state where it is attached, the position of the chip 23 is lowered with respect to the height H of the safety cover 13, and it is installed so as to enter the inside of the height H. Although not shown, in a cup-type rotary tool in which a chip that is a grindstone for cutting is integrally fixed, the chip is arranged at a position below the lower end of the side wall 13b of the safety cover 13. It becomes. For this reason, the safety cover 13 is formed so that the area covered by the safety cover 13 extends from the half circumference to the entire circumference (not shown).

  Therefore, in this cup-type rotary tool 20, a height h 3 that is a combination of the protruding height h 2 of the protruding portion 27 of the substrate 21 and the thickness h 1 of the annular boss member 25 is attached to the drive shaft 15 of the rotary drive mechanism 11 with the mounting bolt 17. Is fixed to be smaller (shorter: lower) than the height h from the positioning portion 15a at the lower end of the side wall 13b of the safety cover 13, or larger (longer: higher) than the same. Will be.

  Further, when the cup-type rotary tool 20 is configured as a cutter, it can be configured such that the cutter blade is installed near the lower end of the safety cover 13. And since the protrusion part 27 of the board | substrate 21 of the cup type rotary tool 20 is formed in the depth which can accommodate a bolt head (end side of an attachment means) 17b, it cuts deeply at the time of a square cut and a cutting. However, it becomes a shape which does not touch the workpiece and is not damaged, and a horizontal cut can be made in a state of being close to the floor surface.

<Method for producing cup-type rotary tool>
Next, an example of a manufacturing method of the cup-type rotary tool 20 will be described with reference to FIGS. 3 (a) to 3 (f) are schematic views schematically showing the whole of an example of the manufacturing process of the cup-type rotary tool, and FIGS. 4 (a) to 4 (c) are diagrams of the chip representing FIG. 3 (c). FIGS. 5A to 5C are schematic diagrams schematically showing the method of temporary fixing, and schematically showing an enlarged configuration of the hot press shown in FIGS. 3D and 3E. .
To manufacture the cup-type rotary tool 20, as shown in FIGS. 3A and 3B, first, a first step of forming a disk-shaped flat substrate 21 and a process shown in FIG. As shown in FIGS. 3D to 3F, the second step of temporarily fixing the chip 23 to the substrate 21 formed as described above, and the protruding portion 27 is formed to protrude from the substrate 21, and the chip 23 and the annular boss member 25 are formed. And a third step of fixing the substrate integrally to the substrate 21. Each configuration will be described below.

  In the first step, a material made of carbon steel is punched to form a disk-like plate having a mounting hole 29 in the center, and thereafter, machining or radiating to the periphery of the plate simultaneously with the mounting hole 29 In this step, the flat substrate 21 is formed by forming the directional groove 35. The flat substrate 21 formed by the first step can be used for a flat rotary tool. Therefore, it may be stocked in the state after completion of the first step, and according to demand, the flat substrate 21 may be used for the steps after the second step to manufacture the cup-type rotary tool 20, You may use for the manufacturing process of a flat type rotary tool after 1 process.

  In the second step, as shown in FIGS. 4A to 4C, a mixed powder of metal powder and diamond particles is cold-pressed at the periphery of the flat substrate 21 using a chip molding die 50. In this way, the chip 23 is molded and temporarily fixed.

  In the second step, as shown in FIG. 4A, the flat substrate 21 is placed on the chip molding die 50 and the flat substrate 21 is positioned and fixed using a positioning jig 51. A space between the grooves 35 on the periphery of the substrate 21 is disposed in the chip forming space 53. The chip forming space 53 is filled with mixed powder obtained by mixing diamond particles with metal powder. Thereafter, as shown in FIG. 4 (b), the chip forming space 53 is clamped and cold-pressed, so that the peripheral edge of the flat substrate 21 as shown in FIGS. 3 (c) and 4 (c). The chip 23 is formed in the portion, and is temporarily fixed to the substrate 21 simultaneously with the forming.

  In the third step, as shown in FIGS. 5A to 5C and FIGS. 3D and 3E, a press mold 60 is used to hot press the substrate 21 on which the chip 23 is temporarily fixed. In this step, the protruding portion 27 is formed by protruding, and the annular boss member 25 is fixed integrally to the protruding portion 27, and at the same time, the chip 23 is fixed integrally to the substrate 21.

  In this third step, as shown in FIG. 5 (a), first, the annular boss member 25 having the communication hole 37 prepared in advance in the projection forming recess 61a of the lower mold 60a of the press mold 60, and the through hole The sintered ring 39 having 41 is disposed, and the substrate 21 on which the chip 23 is temporarily fixed is disposed between the lower mold 60 a and the upper mold 60 b of the press mold 60. At this time, the positioning jig 63 is passed through the mounting hole 29 of the substrate 21, and the positioning jig 63 is passed through the through hole 37 of the annular boss member 25 and the through hole 41 of the sintered ring 39 to position each. Thus, the annular boss member 25 is arranged at a predetermined position of the substrate 21 through the sintered ring 39 so as to face each other. In addition, the chip 23 is disposed at a position corresponding to the chip pressurizing portions 65a and 65b of the upper and lower molds 60a and 60b.

  Then, as shown in FIG.5 (b), it hot-presses between the lower mold | type 60a and the upper mold | type 60b at high temperature, for example, the temperature of 800 to 900 degreeC. Then, the protruding portion 27 is formed at the central portion of the substrate 21 by the protruding portion forming concave portion 61a of the lower mold 60a and the protruding portion forming convex portion 61b of the upper mold 60b, and at the same time, on the plane around the mounting hole 29 of the protruding portion 27. The annular boss member 25 is fixed integrally with the sintered ring 39. Further, the chip 23 is sintered by the chip pressing portions 65 a and 65 b of the upper and lower molds 60 a and 60 b and is fixed integrally to the periphery of the substrate 21.

  And as shown in FIG.5 (c) and FIG.3 (f), the cup type rotary tool 20 is manufactured by taking out from the press molding die 60. FIG.

  According to the manufacturing method of the cup-type rotary tool 20 as described above, since the protruding portion 27 of the substrate 21 is formed by protruding by hot pressing, the substrate 21 made of carbon steel that is hard and difficult to deform compared to soft iron. Even if it exists, it is possible to form without breaking.

  At that time, when the substrate 21 is protruded by hot pressing, the chip 23 and the annular boss member 25 are integrally fixed to the substrate 21, so that the number of steps can be reduced and the manufacturing is easy. At the same time, since the chip 23 and the annular boss member 25 are placed at predetermined positions and hot-pressed, these positional deviations hardly occur, and the chip 23 and the annular boss member 25 can be fixed to the substrate 21 with high accuracy. .

  In addition, since the annular boss member 25 in which the communication holes 37 are formed with high accuracy in advance is deformed and fixed by hot pressing, the communication is made in comparison with the mounting holes 29 provided directly in the substrate 21. The accuracy of the hole 37 is unlikely to decrease.

As a result, it is possible to form the substrate 21 of the cup-type rotary tool 20 with carbon steel as thin as the flat-type rotary tool, and to reduce the weight of the cup-type rotary tool 20 while ensuring strength during use. It is easy to reduce the load on the user and the rotary drive mechanism 11 during use.
In addition, since the substrate 21 before the protruding portion 27 is formed by hot pressing can be used in common with the substrate of the flat rotary tool, the types of inventory can be reduced.

  Further, the cup-type rotary tool 20 is attached to the inside of the safety cover 13, and a height h 3 that is a combination of the protruding height h 2 of the substrate 21 and the thickness h 1 of the annular boss member 25 is formed on the periphery of the substrate 21. Since the height of the fixed chip 23 is set at a predetermined position with respect to the side wall 13b of the safety cover 13, the protrusion height h2 of the protrusion 27 of the substrate 21 is reduced by the thickness h1 of the annular boss member 25. Is possible. Therefore, it is possible to suppress the amount of the substrate 21 made of carbon steel, which is difficult to deform, to protrude and deform, and it is easy to manufacture.

In addition, the said embodiment can be suitably changed within the scope of the present invention.
For example, in the above description, the example in which the annular boss member 25 is integrally fixed to the projecting portion 27 of the substrate 21 when the flat substrate 21 is hot-pressed to form the projecting portion 27 has been described. After forming the protrusion 27 by hot pressing the substrate 21, the substrate 21 is fixed to the substrate 21 by an appropriate means such as laser welding or spot welding in a state where the communication hole 37 is communicated with the mounting hole 29 of the substrate 21. However, it is possible to manufacture the cup-type rotary tool of the present invention.

  In the above description, the substrate 21 and the annular boss member 25 are fixed to each other by hot pressing the annular boss member 25 with the sintered ring 39 interposed between the substrate 21, but the sintered ring 39 is not used. The metal powder for sintering may be fixed between the substrate 21 and the annular boss member 25 by hot pressing. Further, in the above description, the annular boss member 25 prepared in advance is fixed to the substrate 21. However, the annular boss member 25 is preliminarily molded from a metal powder during hot pressing, and the temporarily formed annular boss member 25 is formed. It is also possible to sinter and fix to the substrate 21 integrally.

  Further, in the above, when the flat substrate 21 is hot-pressed to form the protruding portion 27, the chip 23 is formed by forming a mixed powder of metal powder for sintering and diamond particles, and the substrate 21. Although an example in which the chip 23 is fixed to the periphery of the substrate 21 has been described, a chip 23 prepared in advance may be used, or the chip 23 may be fixed to the periphery of the substrate 21 separately from the formation of the protruding portion 27.

  Further, in the above description, the example in which the mounting bolt 17 is used as the mounting member for mounting the cup-type rotary tool 20 to the rotational drive mechanism 11 has been described, but there is no particular limitation, and the drive shaft 15 of the rotational drive mechanism 11 is not limited. If a male screw is provided, a nut or the like or other attachment means may be used.

Moreover, although the example which covers the substantially half circumference of the cup type rotary tool 20 was demonstrated as the safety cover 13 above, the whole circumference of the cup type rotary tool 20 may be covered, and the area | region to coat | cover is not specifically limited. .
A flat rotary tool (not shown) can be exchanged and attached to the drive shaft 15 of the rotary drive mechanism 11 with the cup-type rotary tool 20 detached.

It is a figure which shows the principal part of the processing apparatus with which the cup type rotary tool which concerns on this invention was mounted | worn, (a) is a top view, (b) is sectional drawing which shows the mounting part of a cup type rotary tool. The cup type rotary tool which concerns on this invention is shown, (a) is a disassembled perspective view, (b) is a perspective view. (A)-(f) is a schematic diagram which illustrates typically the whole about an example of the manufacturing process of the cup type rotary tool which concerns on this invention. (A)-(d) is a schematic diagram which shows typically the method of temporarily fixing the chip | tip represented to FIG.3 (c). (A)-(d) is a schematic diagram which expands and shows typically the structure of the hot press represented to FIG.3 (d), (e). It is a figure explaining the manufacturing process of the conventional cup type rotary tool.

Explanation of symbols

11 Rotation Drive Mechanism 13 Safety Cover 13a Upper Wall 13b Side Wall 15 Drive Shaft 17 Mounting Bolt (Mounting means)
20 Cup-type rotary tool 21 Substrate 23 Chip 25 Annular boss member 27 Projection (recess)
29 Mounting hole 31 Flat surface 37 Communication hole 39 Sintered ring (sintered material)

Claims (5)

A cup provided with a concave portion in which a central portion of a disc-shaped substrate formed of carbon steel is projected and molded while being attached to a drive shaft installed inside a safety cover provided in a rotary drive mechanism by a mounting means. A mold rotating tool,
A cutting tip fixed to the periphery of the substrate;
An annular boss member fixed integrally with the mounting hole in communication with the mounting hole on the flat surface of the projecting molded recess of the substrate;
The cup-shaped rotary tool is characterized in that the concave portion is protruded and molded to a hole depth that accommodates the end of the attachment means attached to the drive shaft.   2. The cup-type rotary tool according to claim 1, wherein the annular boss member is fixed integrally with the substrate through a sintered material at a position where a communication hole communicates with the mounting hole.   The annular boss member is fixed to the substrate in a state in which the communication hole is communicated with a mounting hole of the substrate after the central portion of the annular boss member is formed by protruding molding by hot pressing. Item 2. The cup-type rotary tool according to Item 1.   The cup-shaped rotary tool according to claim 1, wherein the annular boss member is formed of a sintered material. In the method of manufacturing a cup-type rotary tool, which is used by being attached to a drive shaft of a rotary drive mechanism, and is formed of carbon steel and includes a concave portion in which a central portion of a disk-shaped substrate protrudes.
A first step of forming a mounting hole to be attached to the drive shaft of the rotary drive mechanism in the center of the substrate by machining;
A second step of temporarily fixing a cutting tip to the periphery of the substrate by cold pressing;
An annular annular boss member having a communication hole communicating with the mounting hole of the substrate is placed in a state where the annular boss member is opposed to a plane around the mounting hole via a sintered material, and is heated with a hot press to form the substrate A third step of projecting and forming a recess in the center of the substrate, fixing the chip integrally to the periphery of the substrate during the hot press, and integrally fixing the annular boss member to the center of the substrate. The manufacturing method of the cup type rotary tool characterized by performing these.

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