JP7577599B2 - Cutting tools - Google Patents

Description

The present invention relates to a cutting tool.

Drills are cutting tools used to make holes in steel plates and adjust the diameter of the holes. For example, a step drill is a drill that can make holes of various diameters, and a reamer is a drill that can adjust the diameter of the hole made by the drill. This type of cutting tool is available in both manual and electric versions. Electric reamers are configured so that they can be attached to electric tools such as impact wrenches. An example of a configuration that allows attachment to an impact wrench is the configuration described in Patent Document 1.

The connection structure (hereinafter referred to as "adapter") described in Patent Document 1 includes a housing portion into which the drive rotary tool's drive socket is inserted to house the drive socket, and a fixing portion that is provided on the surface opposite the opening of the housing portion and fixes the cutting member. The fixing portion is male threaded and is adapted to be screwed into the female thread of the step drill, which is the cutting member.

JP 2015-223659 A

The adapter in Patent Document 1 is arranged so that the threads of the fixing part are in the opposite direction to the rotational direction of the cutting member, and the female threads of the cutting member and the fixing part (male threads) act to tighten each other during cutting processing. For this reason, the adapter is constantly being retightened during cutting processing. Patent Document 1 mentions a way to prevent the fixation between the fixing part and the cutting member from weakening whether the driving rotary tool rotates forward or backward, but does not mention a configuration for releasing the fixation between the fixing part and the cutting member. For this reason, the invention in Patent Document 1 makes it difficult to remove the cutting member from the fixing part of the adapter after the hole drilling process is completed.

However, it would be useful if the cutting body attached to the adapter could be replaced. For example, this would allow for replacement with a different type of drill bit (such as a step drill or reamer drill bit), or for replacing the drill bit portion if the drill bit is damaged. To achieve this, it is necessary to provide a mechanism that allows the cutting body to be easily removed even if it is tightened to the adapter.

Therefore, one of the objects of the present invention is to provide a cutting tool tip in which the cutting body and the adapter for mounting the cutting body to the rotary tool are detachable, and in which the cutting body can be easily removed from the adapter.

In view of the above object, the present invention provides a cutting tool for forming a hole in an object, comprising:
A rod-shaped cutting body extending along a first direction;
an adapter for attaching the cutting body to a rotary tool;
Equipped with
The adapter comprises:
A columnar main body extending in the first direction,
a first hole provided at the other end in the first direction and into which the drive angle of the rotary tool is inserted;
a second hole provided at the other end in the first direction, extending along the first direction and penetrating the first hole, and having a first thread groove provided on an inner circumferential surface;
The configuration includes:
The cutting body portion is
A second thread groove is provided on an outer peripheral surface of one end in the first direction;
A drill bit provided between the other end in the first direction and the second screw groove;
A screw hole provided on an end surface of the one end portion;
Equipped with
The second screw groove is screwed into the first screw groove to be attached to the adapter.

According to the present invention, the cutting body and the adapter that attaches the cutting body to the rotary tool are detachable, and the cutting body can be easily removed from the adapter.

FIG. 1 is a schematic diagram showing a cutting tool tip and an impact wrench according to an embodiment. FIG. 2 is a plan view of the adapter with the cutting body removed. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a plan view of the first end side of the adapter as viewed from a first direction. FIG. 5 is a plan view of the second end side of the adapter as viewed from the first direction. FIG. 6 is a plan view of the cutting body removed from the adapter. FIG. 7 is a plan view of the first end side of the cutting body viewed from the second direction. FIG. 8 is a plan view of the second end side of the cutting body as viewed from the second direction. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. FIG. 10 is a diagram showing a cutting body of a cutting tool tip according to a modified example. FIG. 11 is a plan view of the first end side as viewed from a direction along the central axis. FIG. 12 is a diagram showing a cutting body of a cutting tool tip according to another modified example.

One embodiment of the present invention will be described below with reference to the drawings. In the following, the cutting tool will be described as a reamer (also called a bridge reamer). A reamer is a tool that adjusts (finishes) the diameter of a hole by inserting a drill bit into a hole drilled in a steel plate or the like and rotating the drill bit to cut the inner circumference of the hole. In addition, an impact wrench will be described as an example of a rotating tool to which a cutting tool can be attached and detached.

[About impact wrenches]
Fig. 1 is a schematic diagram showing a cutting tool 1 according to the present embodiment and an impact wrench 50. In Fig. 1, a circled portion is shown in an enlarged scale.

The impact wrench 50 has a motor that is supplied with electricity or air, etc., and the motor rotates the rotating shaft. The impact wrench 50 has a convex socket 51 that rotates in accordance with the rotation of the rotating shaft.

The socket 51 is a square prism with rounded corners, and pin insertion holes 52 are formed on both parallel side surfaces. Note that pin insertion holes may also be formed on the top and bottom surfaces perpendicular to both side surfaces. For convenience of explanation, the surface on which the pin insertion hole 52 is formed is referred to as the side surface, but since the socket 51 rotates, the side surface and the top and bottom surfaces are not specified. This pin insertion hole 52 is a through hole for inserting a pin (not shown) to connect the cutting tip tool 1 described below to the socket 51. The cutting tip tool 1 connected to the socket 51 rotates as the socket 51 rotates. The specific internal configuration of the impact wrench 50 is the same as that of a conventional impact wrench, so a detailed description will be omitted.

[Specific configuration of cutting tip tool 1]
The specific configuration of the cutting tool 1 will be described in detail below.

The cutting tool tip 1 comprises an adapter 10 and a cutting body 20. As will be described in detail later, the cutting body 20 has a drill bit on its outer circumferential surface. The cutting body 20 is removably attached to the adapter 10. The adapter 10 is attached to the socket 51 of the impact wrench 50. In other words, the cutting body 20 having the drill bit is removably attached to the impact wrench 50 via the adapter 10.

First, the adapter 10 will be described. Figure 2 is a plan view of the adapter 10 with the cutting body 20 removed. Figure 3 is a cross-sectional view taken along line III-III in Figure 2.

The adapter 10 has a substantially cylindrical main body 11 centered on a central axis P1. Hereinafter, the direction along the central axis P1 is referred to as the first direction.

A connection portion is provided at the first end of the body portion 11 in the first direction, which connects to the insertion angle 51 of the impact wrench 50. The connection portion has an insertion hole 12, a groove 13, a first through hole 14A, and a second through hole 14B.

Figure 4 is a plan view of the first end side of the adapter 10 viewed from the first direction.

The insertion hole 12 is formed along the central axis P1 and allows the insertion angle 51 of the impact wrench 50 to be inserted.

The groove 13 is annular in shape and extends in the circumferential direction about the central axis P1, and is formed on the outer circumferential surface of the first end of the main body 11. An O-ring 2, as shown in FIG. 1, is fitted into this groove 13.

The first through hole 14A is formed to penetrate from the insertion hole 12 to the groove 13 in the radial direction centered on the central axis P1. The second through hole 14B is formed to penetrate from the insertion hole 12 to the groove 13 in the radial direction. As shown in FIG. 3, the first through hole 14A and the second through hole 14B are located on opposite sides of the central axis P1 and on the same straight line. The first through hole 14A and the second through hole 14B have a size that allows the insertion of a pin to be inserted into the pin insertion hole 52 of the drive angle 51.

When the adapter 10 is attached to the impact wrench 50, the socket 51 is inserted into the socket hole 12 of the adapter 10 by aligning the pin insertion hole 52 of the socket 51 with the first through hole 14A and the second through hole 14B so that a series of holes along the radial direction is formed. A pin is then inserted into this series of holes. An O-ring 2 (see Figure 1) is fitted into the groove 13 to prevent the pin inserted into the series of holes from falling out.

The connection portion provided at the first end of the main body 11 is not limited to the above configuration as long as it can be attached to the socket angle 51 of the impact wrench, and if the counterpart is a rotating tool other than an impact wrench, it will be changed appropriately depending on the configuration of the counterpart.

At the second end of the main body 11 in the first direction, a hole (second hole) 15 is provided that extends along the first direction and has a screw groove (first screw groove) 15A formed on the inner peripheral surface. FIG. 5 is a plan view of the second end side of the adapter 10 viewed from the first direction. The cutting main body 20 described below is inserted into this hole 15, and the cutting main body 20 is fixed to the hole 15 by screw action. The hole 15 is formed along the central axis P1 so as to overlap with the insertion hole 12 in the first direction. In addition, the hole 15 and the insertion hole 12 are connected. Therefore, when the cutting main body 20 is inserted into the hole 15, the end face of the cutting main body 20 can be seen from the insertion hole 12 side.

Next, we will explain the cutting body part 20 that is inserted into the hole 15 of the adapter 10.

Figure 6 is a plan view of the cutting body 20 after it has been removed from the adapter 10.

The cutting body 20 is rod-shaped and extends along the central axis P2. Hereinafter, the direction along the central axis P2 is referred to as the second direction. A screw groove (second screw groove) 21 is provided on the outer peripheral surface of the first end of the cutting body 20 in the second direction. One of the screw groove 21 and the screw groove 15A of the adapter 10 is male threaded and the other is female threaded. The first end of the cutting body 20 is inserted into the hole 15 of the adapter 10, and the screw groove 21 is fitted into the screw groove 15A of the adapter 10, so that the cutting body 20 is fixed to the adapter 10. When the cutting body 20 is attached to the adapter 10, the central axis P1 and the central axis P2 coincide with each other. In other words, when the cutting body 20 is attached to the adapter 10, the first direction and the second direction coincide with each other.

Figure 7 is a plan view of the first end side of the cutting body 20 viewed from the second direction. A screw hole 22 is provided on the end face of the first end side of the cutting body 20. The figure shows an example in which the screw hole 22 is a flathead groove (slot). As described above, when the cutting body 20 is inserted into the hole 15, the end face of the cutting body 20 can be seen from the insertion hole 12 side. Therefore, with the cutting body 20 attached to the adapter 10, a flathead screwdriver can be inserted from the insertion hole 12 to fit the flathead screwdriver into the screw hole 22. Then, by rotating the cutting body 20 with the flathead screwdriver, the cutting body 20 fixed to the adapter 10 by the screw action can be removed from the adapter 10. This allows the cutting body 20 to be removed from the adapter 10 using a flathead screwdriver, even if, for example, the screws are caught together and removal is difficult when removing the cutting body 20 from the adapter 10, or if the cutting body 20 breaks during cutting and only the thread groove 21 of the cutting body 20 remains inside the hole 15 of the adapter 10.

In the above description, an example of a flathead groove (slot) was given as the screw hole 22, but the screw hole 22 may be a flathead groove, a Phillips groove (cross recess), a hexagonal hole, a square hole, a star-shaped hole (hex lobe), or any other known screw hole. If the cutting body 20 is provided with these screw holes, it can be easily removed from the adapter 10 by hand or using a power tool (such as an impact wrench or impact driver) with a bit or wrench that corresponds to the screw hole, a screwdriver, a hexagonal wrench, or other hand tool, or an electric screwdriver.

The drill blade 23 is provided on the outer peripheral surface of the cutting body 20 between the second end side and the screw groove 21 in the second direction. FIG. 8 is a plan view of the second end side of the cutting body 20 viewed from the second direction. The drill blade 23 is a reamer blade that adjusts the diameter of a hole formed in a steel plate or the like, and the configuration of the blade is not particularly limited. However, it is preferable that the drill blade 23 is configured to cut the steel plate or the like by rotating in the opposite direction to the direction in which the cutting body 20 is rotated when the cutting body 20 is fixed to the adapter 10 by screw action. For example, when the cutting body 20 is rotated clockwise when fixed to the adapter 10, the drill blade 23 is configured to cut the steel plate or the like by rotating the cutting body 20 counterclockwise. This makes it possible to prevent the cutting body 20 from falling off the adapter 10 during cutting.

9 is a cross-sectional view taken along line IX-IX in FIG. 6. A pair of planes, a first plane 24A and a second plane 24B, is provided on the outer peripheral surface of the cutting body 20 between the screw groove 21 and the drill bit 23 in the second direction. The first plane 24A and the second plane 24B are parallel to the second direction and to each other, and further overlap in a direction perpendicular to the second direction. By providing the first plane 24A and the second plane 24B, the cutting body 20 can be rotated by pinching the first plane 24A and the second plane 24B with a wrench or the like. In other words, the cutting body 20 can be attached to the adapter 10 and removed from the adapter 10 using a tool such as a wrench. Note that the above pair of planes may be one, but may be multiple. For example, when viewed from the second direction, a regular hexagon may be formed by three pairs of planes rotated by 60° from each other.

As described above, the cutting tool tip 1 composed of the adapter 10 and the cutting body 20 can be attached to an impact wrench to adjust (finish) the diameter of a hole formed in a steel plate or the like. Even if the cutting body 20 breaks during cutting work, the cutting body 20 can be removed from the adapter 10 using a flat-head screwdriver. Therefore, even if the drill bit 23 portion of the cutting body 20 breaks during cutting and only the thread groove 21 portion of the cutting body 20 remains, the remaining thread groove 21 portion can be removed from the adapter 10 using a flat-head screwdriver.

Furthermore, since the first plane 24A and the second plane 24B are provided, the cutting body 20 can be removed from the adapter 10 using a tool such as a wrench. As a result, even if the cutting body 20 cannot be removed from the adapter 10 by hand or if the drill bit 23 portion of the cutting body 20 breaks, the cutting body 20 can be removed from the adapter 10 by using a tool such as a wrench.

In the above embodiment, an impact wrench is described as an example of a rotary tool, but the rotary tool may be an impact driver or the like. In this case, the configuration of the connection part of the adapter 10 is appropriately changed to match the impact driver.

Although the cutting tool tip 1 has been described as a reamer for adjusting (finishing) the diameter of a hole, it may be a drill for drilling holes in steel plates, etc. FIG. 10 is a diagram showing the cutting body 30 of a cutting tool tip of a modified example. As in the above embodiment, the cutting tool tip of the modified example also includes an adapter 10 and a cutting body 30, but since the adapter 10 is the same as in the above embodiment, its description will be omitted.

The cutting body 30 is rod-shaped along the central axis P3, and one of its first ends is provided with a screw groove 31 that mates with the screw groove 15A provided on the inner circumferential surface of the hole 15 of the adapter 10, as in the above embodiment. A screw hole 32 is provided on the end face of the first end. In this modified example, the screw hole 32 is also a flathead groove. Figure 10 is a plan view of the first end side as viewed from the direction along the central axis P3.

A drill bit 33 is provided on the outer peripheral surface of the cutting body 30 between the second end side and the screw groove 31 in the direction along the central axis P3. The drill bit 33 is a blade for drilling holes in steel plates and the like, and its diameter gradually decreases toward the tip.

In addition, a first plane 34A and a second plane 34B are provided on the outer peripheral surface of the cutting body 20 between the screw groove 31 and the drill bit 33 in the direction along the central axis P3. The first plane 34A and the second plane 34B, like the first plane 24A and the second plane 24B in the above embodiment, allow the cutting body 30 to be attached to the adapter 10 and to be removed from the adapter 10 using a tool such as a wrench.

Furthermore, the cutting tool tip may be an integrated drill bit for drilling holes in steel plates and the like, and a reamer drill bit for adjusting (finishing) the diameter of the hole. Figure 12 shows the cutting body 40 of another modified cutting tool tip. In this modified example, as in the above embodiment, the cutting tool tip includes an adapter 10 and a cutting body 40, but since the adapter 10 is the same as in the above embodiment, its description is omitted.

The cutting body 30 is rod-shaped along the central axis P4, and one of its first ends is provided with a screw groove (second screw groove) 41 that mates with the screw groove 15A provided on the inner peripheral surface of the hole 15 of the adapter 10, as in the above embodiment. A screw hole 42 is provided on the end face of the first end. In this modified example, the screw hole 42 is also a minus groove. The plan view of the first end side viewed from the direction along the central axis P4 is the same as that in FIG. 7.

A drill bit 43 is provided on the outer peripheral surface of the cutting body 40 between the second end side in the direction along the central axis P4 and the screw groove 41. The drill bit 43 has a drill bit for drilling holes in steel plates and the like, which is provided at the second end in the direction along the central axis P4, and a reamer drill bit for adjusting the diameter of the hole, which is provided between the drill bit for drilling holes and the screw groove 41. In other words, in this modified example, a single cutting body 40 can perform the work of drilling holes in steel plates and the like and the work of adjusting the diameter of the hole. In the case of such an integrated cutting tip tool, there is a problem that it cannot be used if either the drill bit for drilling or the reamer drill bit is damaged. For this reason, in the case of such an integrated cutting tip tool, it is preferable to coat the surface with titanium aluminum nitride or the like to a hardness of, for example, HRC 60 or more.

In addition, a first plane 44A and a second plane 44B are provided on the outer peripheral surface of the cutting body 40 between the screw groove 41 and the drill bit 43 in the direction along the central axis P4. The first plane 44A and the second plane 44B, like the first plane 24A and the second plane 24B in the above embodiment, allow the cutting body 40 to be attached to the adapter 10 and removed from the adapter 10 using a tool such as a wrench.

REFERENCE SIGNS LIST 1 Cutting tip tool 2 O-ring 10 Adapter 11 Body 12 Insertion hole 13 Groove 14A First through hole 14B Second through hole 20, 30, 40 Cutting body 21, 31, 41 Screw groove 22, 32, 42 Screw hole 23, 33, 43 Drill bit 24A, 34A, 44A First flat surface 24B, 34B, 44B Second flat surface 50 Impact wrench 51 Insertion angle 52 Pin insertion hole

Claims (6)

A cutting tool for forming a hole in an object,
A rod-shaped cutting body extending along a first direction;
an adapter for attaching the cutting body to a rotary tool;
Equipped with
The adapter comprises:
A columnar main body extending in the first direction,
a first hole provided at one end in the first direction and into which the drive angle of the rotary tool is inserted;
a second hole provided at the other end in the first direction, extending along the first direction and penetrating the first hole, and having a first thread groove provided on an inner circumferential surface;
The configuration includes:
The cutting body portion is
A second thread groove is provided on an outer peripheral surface of one end in the first direction;
A drill bit provided between the other end in the first direction and the second screw groove;
a tool engagement hole provided on an end surface of the one end;
Equipped with
The second screw groove is fitted with the first screw groove by a screw action, and the adapter is attached to the adapter , so that the torque from the insertion angle is transmitted from the adapter to the cutting body portion ,
The tool engagement hole is a cutting tip tool in which, when the first hole of the adapter is removed from the drive angle of the rotating tool, a specific tool is inserted through the first hole and rotated, causing the second thread groove of the cutting body portion to rotate relative to the first thread groove . The tool engagement hole is a slot, a Phillips slot, a hexagonal hole, a square hole, or a star-shaped hole;
The cutting tool according to claim 1 . The cutting body portion has a first plane and a second plane provided on an outer peripheral surface between the second thread groove and the drill bit in the first direction, the first plane and the second plane are parallel to the first direction and overlap in a direction perpendicular to the first direction.
The cutting tool according to claim 1 or 2. The drill bit is a reamer drill bit that adjusts the diameter of a hole formed in the object.
The cutting tool according to any one of claims 1 to 3. The drill blade has a blade for drilling a hole in the object provided at the other end in the first direction, and a reamer blade for adjusting the diameter of the hole provided between the blade for drilling the hole and the second thread groove.
The cutting tool according to any one of claims 1 to 3. The rotary tool is an impact wrench.
The cutting tool according to any one of claims 1 to 5.

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