JP5351465B2 - Manufacturing method of disk-shaped rotary tool and disk-shaped rotating tool manufactured thereby - 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&amp;INPIT

Description

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

2. Description of the Related Art Conventionally, many rotary tools such as cutters and sanders are known that are used by fixing chips such as cutting blades and grinding blades to the peripheral edge of a circular substrate and attaching them to a drive shaft of a rotary drive mechanism to rotate them. . The rotary tool includes a flat-type rotary tool in which a chip is fixed to the periphery of a flat disk-shaped substrate, and a disk-shaped ( cup-type ) rotary tool in which a chip is fixed to the periphery of the substrate protruding from the center. (For example, see Patent Documents 1 and 2 below). The disc-shaped ( cup-type ) rotary tool can be installed 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 can be It is possible to make it close to the surface, and it is possible to efficiently work on the workability of the corner portion and a wide processing surface.

In order to manufacture such a disk-shaped ( 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. A mounting hole 72 is formed in the center of the substrate 71, and a groove 73 and the like are formed in the periphery. Next, 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 disk-shaped ( cup type) rotary tool has the following problems.
In the disk-shaped ( cup type) rotary tool, the center portion of the substrate must be offset. In that case, it is common to perform a cold press, which 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, none of the flat rotary tool and the disk-shaped (cup type) rotary tool, when stock manufacturer, have been stocked in the state of the substrate is not fixed tip, flat rotary tool and discoid (Cup The type) rotating tool must be stocked with substrates of different materials, different shapes, and different plate thicknesses. Since the types of stock increase, a configuration capable of handling a small number of types has been desired.

The present invention has been made in view of the above problems, easier to weight while ensuring the strength at the time of use, also disc-shaped rotating tool capable of reducing the number of types of inventory and disk-shaped rotary It is an object of the present invention to provide a tool manufacturing method.

In order to solve the above-mentioned problem, the manufacturing method of the disk-shaped rotary tool is used by being attached with a mounting bolt that is a separate body from the female screw provided on the drive shaft of the rotary drive mechanism , and is formed of carbon steel , In a manufacturing method of a disk-shaped rotary tool provided with a recess in which a central portion of a disk-shaped substrate protrudes, a first step of forming a mounting hole to be attached to a drive shaft of the rotary drive mechanism at the center of the substrate by machining A second step of temporarily fixing a cutting tip to the peripheral edge of the substrate by a cold press, and an annular annular boss member having a communication hole communicating with the attachment hole at the center of the substrate on a plane around the attachment hole In a state of being placed facing each other through a sintered material, the substrate is heated by a hot press to project a recess in the central portion of the substrate, and the chip is integrated with the periphery of the substrate during the hot pressing. Fixed to , And a procedure for performing a third step of fixing are sintered together, the by the sintered material of the annular boss member in a state in which communication with the communication hole in the substrate and concentric.

According to such a procedure, the production method of the disk-shaped rotary tools, because the molding is protruded central portion of the base plate at hot press, be a substrate made of hard carbon steel deforming damage It is possible to make it protrude without. 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. Moreover, since the annular annular boss member having the communication hole is fixed by protruding the substrate by hot pressing, the accuracy of the communication hole is less likely to be lower than the mounting hole provided directly in the center of the substrate. As a result, it becomes possible to form the substrate of the disk-shaped rotary tool thinly with carbon steel like the flat type rotary tool, and it is easy to reduce the weight of the disk-shaped rotary tool while ensuring the strength at the time of use, Moreover, it can be shared with the substrate of the flat type rotary tool, and the types of inventory can be reduced.

Then, in order to solve the above problems, a disk-shaped rotating Engineering tools are pre-SL and the chip for cutting fixed to the periphery of the substrate, the plane of the rotation driving mechanism side on the opposite side of the projecting molding the concave portion of the substrate in, and a circular boss member which is fixed to the substrate and integrally through a sintered material in a state in which the communicating throughbore into the mounting hole in the center of the substrate communicates with the same heart, the recess the drive It is the recessed part protrudingly molded by the hole depth accommodated to the end side of the said mounting bolt which is the said separate body attached to the axis | shaft, By the manufacturing method of Claim 1, the protrusion molding of the said recessed part, and the said for cutting The chip was fixed by sintering and the annular boss member was fixed by sintering at a time.

According to such a configuration, a disc-shaped rotating tool, since the disk-shaped rotary tool center portion of the circular substrate is protruded is formed by carbon steel, disc-shaped rotating tool while ensuring the strength Easy to reduce weight. Moreover, since the annular boss member is integrally fixed to the protruding center of the substrate in the disk-shaped rotary tool, the protruding height of the substrate in the mounting hole of the substrate can be reduced by the thickness of the annular boss member. It is. 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 disk-shaped rotary tool has a configuration of a cutter or a grindstone, or a state in which a mounting bolt that is a separate body is housed in a recess even when the substrate is operated in a flat state with respect to a workpiece. Therefore, workability is also excellent.
Further, the disk-shaped rotary tool can simultaneously perform the fixing of the annular boss member, the fixing of the chip, and the processing of the substrate by hot pressing according to the manufacturing method according to claim 1. Even if the accuracy of the mounting hole is reduced, the accuracy can be ensured by the communication hole of the annular boss member, so that the manufacturing is easy, and the disk-shaped rotary tool can be operated well when used.

According to the manufacturing method of the disk-shaped rotary tool according to the present invention, the fixing of the cutting tip, the fixing of the annular ring, and the protruding molding of the substrate can be performed in one process, and the number of processes can be reduced. In addition, since the protrusion of the substrate is performed 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.
In the disk-shaped 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.

[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 showing a main part of a processing apparatus equipped with a disk-shaped rotary tool, wherein FIG. 1A is a plan view of the processing apparatus, and FIG. 1B is a cross-sectional view schematically showing a mounting shaft position of the processing apparatus. FIGS. 2A and 2B show a disk-shaped 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 disk-shaped 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 on the head.

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 disk-shaped rotary tool 20 and a female screw 15b. This drive shaft 15 in a state where the end face 20a is abutted against the disc-shaped rotating tool 20 to the positioning portion 15a, is inserted a mounting bolt 17 from the other end face 20b side of the disk-shaped rotating tool 20, the female screw 15b The disk-shaped rotary tool 20 is attached by screwing together. 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>
Safety cover 13 is here provided fixed to a rotary drive mechanism 11 so as to cover substantially half of the disk-shaped rotating tool 20, upper wall 13a covering spaced half the face of the disk-shaped rotating tool 20 And a side wall 13b that covers the outer periphery of the disk-shaped rotary tool 20 so as to be separated from each other. 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.

< Disk-shaped rotary tool>
Discoid rotating tool 20, as shown in FIG. 2, the substrate 21 of the disc-shaped, the tip 23 for cutting fixed to the periphery of the substrate 21, the annular boss member 25 secured to the center of the substrate 21 With.

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) 17 b that is a projecting portion of the mounting bolt 17 is housed, and the periphery of the mounting hole 29 rotates in a disk shape. The other end surface 20b of the tool 20 is constituted. 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. .

Annular boss member 25 has a communicating hole 37 which penetrates in the thickness direction, centered, for example, the plane 31 of the projection 27 of the substrate 21 are firmly fixed together by sintering the ring 39. Through holes 41 penetrating in the thickness direction center of the sintered ring 39 is provided, communicating holes 37 of the annular boss member 25 via the through hole 41 of the sintered ring 39, the center of the substrate 21 The mounting holes 29 are communicated with each other. 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 disk-shaped rotary tool 20, since the state in which the chip 23 serving as a cutter is fixed integrally for cutting is shown here, as shown in FIG. 1B, the drive shaft of the rotary drive mechanism 11 is shown. 15, the position of the chip 23 is lower than the height H of the safety cover 13, and the safety cover 13 is installed so as to enter the inside of the height H. In addition, although not illustrated, in the disk-shaped rotary tool in a state in which a chip serving as a grindstone for cutting is integrally fixed, the chip is disposed at a position below the lower end of the side wall 13b of the safety cover 13. It becomes composition. 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 disk-shaped rotary tool 20, the height h 3, which is the combined 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. When fixed by 17, it is formed to be smaller (shorter: lower) than the height h from the positioning portion 15 a at the lower end of the side wall 13 b of the safety cover 13, or larger (longer: higher) than the same. Will be.

Further, when the disk-shaped 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 disk-shaped rotary tool 20 is formed in the depth which can accommodate | bolt a bolt head (end side of an attachment means) 17b, a notch | incision is deeply cut at the time of a corner cut and a cutting. Even so, the workpiece can be in contact with the workpiece and not damaged, and a horizontal cut can be made while being close to the floor surface.

<Manufacturing method of disk-shaped rotary tool>
Next, an example of a manufacturing method of the disk-shaped 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 disk-shaped rotary tool, and FIGS. 4 (a) to 4 (c) are chips representing FIG. 3 (c). FIGS. 5A to 5C are schematic diagrams schematically showing an enlarged configuration of the hot press shown in FIGS. 3D and 3E. is there.
In order to manufacture the disk-shaped rotating tool 20, as shown in FIGS. 3A and 3B, first, a first step of forming a disk-shaped flat substrate 21, and FIG. As shown in FIGS. 3D to 3F, the second step of temporarily fixing the chip 23 to the substrate 21 formed as shown in FIG. And a third step of fixing 25 to the substrate 21 integrally. Each configuration will be described below.

The first step, by punching a material made of carbon steel, to form a disc-shaped plate having a mounting hole 29, centered, then machining or simultaneously with mounting holes 29, the periphery of the plate In this process, the flat substrate 21 is formed by forming the radial grooves 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 the end of the first step, and according to demand, the flat substrate 21 may be subjected to the steps after the second step to manufacture the disk-shaped rotary tool 20, You may use for the manufacturing process of a flat type rotary tool after a 1st 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, 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 disk shaped rotary tool 20 is manufactured by taking out from the press molding die 60. FIG.

According to the manufacturing method of the disk-shaped 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 so, it can be molded without being damaged.

  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, the substrate 21 of the disk-like rotary tool 20 can be made thin with carbon steel in the same manner as the flat rotary tool, and the weight of the disk-like rotary tool 20 can be reduced while ensuring strength during use. The load on the user and the rotary drive mechanism 11 can be reduced 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 disk-shaped rotary tool 20 is attached to the inside of the safety cover 13, and a height h3 obtained by combining the protruding height h2 of the substrate 21 and the thickness h1 of the annular boss member 25 is the peripheral edge of the substrate 21. Since the tip 23 fixed to the side wall 13b of the safety cover 13 is arranged at a predetermined position, the protruding height h2 of the protruding portion 27 of the substrate 21 is equal to the thickness h1 of the annular boss member 25. It can be lowered. 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 at the center of the substrate 21. Even so, it is possible to manufacture the disk-shaped 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 disk-shaped rotary tool 20 to the rotational drive mechanism 11 is described, but the present invention is not particularly limited, and the drive shaft of the rotational drive mechanism 11 is not limited. As long as a male screw is provided at 15, a nut or the like may be used, or other attachment means may be used.

Moreover, although the example which covers the substantially half circumference of the disk shaped rotary tool 20 was demonstrated as the safety cover 13 in the above, it may cover the whole circumference of the disk shaped rotary tool 20, and the area | region to coat | cover is especially It is not 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 disc-like rotary tool 20 detached.

It is a figure which shows the principal part of the processing apparatus which mounted | wore with the disk shaped rotating tool which concerns on this invention, (a) is a top view, (b) is sectional drawing which shows the mounting part of a disk shaped rotating tool. The disk-shaped 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 disk shaped 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 disk-shaped ( 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 disk-shaped rotary tool 21 substrate 23 chip 25 annular boss member 27 protrusion (recess)
29 Mounting hole 31 Flat surface 37 Communication hole 39 Sintered ring (sintered material)

Claims (2)

A disk-shaped rotation that is used by being mounted by a mounting bolt that is a separate body from the female screw provided on the drive shaft of the rotation drive mechanism, and that is formed of carbon steel and that has a recess protruding from the center of a disk-shaped substrate. In the manufacturing method of the tool,
A first step of forming a mounting hole to be attached to the drive shaft of the rotary drive mechanism at 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 communicating hole communicating with the mounting hole at the center of the substrate is heated with a hot press in a state where the annular boss member is disposed facing a plane around the mounting hole via a sintered material. A recess is protruded from the central portion of the substrate, the chip is integrally fixed to the periphery of the substrate during the hot pressing, and the annular boss member is concentrically connected to the communication hole with the substrate. And a third step of integrally sintering and fixing with the sintered material in a state where the disk-shaped rotary tool is manufactured. A cutting tip fixed to the periphery of the substrate;
The substrate is fixed integrally with the substrate via a sintered material in a state in which a communication hole is concentrically connected to a mounting hole at the center of the substrate on a plane on the side of the rotational drive mechanism that is opposite to the concavely formed recess of the substrate. An annular boss member,
The concave portion is a concave portion that is protruded and molded to a hole depth that accommodates up to the end side of the mounting bolt that is a separate body attached to the drive shaft ,
By the manufacturing method according to claim 1,
A disk-shaped rotary tool produced by projecting the recess, fixing by sintering the cutting tip, and fixing by sintering the annular boss member at a time .

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