JP2020179436A - Tip replacement type drill - Google Patents

Abstract

To provide a tip replacement type drill capable of stably fastening a head component to a body component regardless of the skill of a worker, without providing a shaft part on the head component when fastening the head component and the body component.SOLUTION: In a tip replacement type drill 100 having a head component 10 having a cutting edge and a body component 50 equipped with a shank, the head component 10 is provided with a vertical wall surface portion positioned on a rear side in a rotating direction than a flank adjacent to the cutting edge, and a curved surface portion positioned on the rear side in the rotating direction and on a center side. The curved surface portion has a front curving portion tilting to a tip end portion side, and a rear curved surface portion positioned on a rear side of the head component and formed from two or more curved surfaces. On one end side of the body component 50, two columns are provided, and each column has an outer peripheral wall surface portion and an inner peripheral wall surface portion. The vertical wall surface portion contacts with the outer peripheral wall surface portion, and the rear curved surface portion contacts with the inner peripheral wall surface portion, thereby fastening the head component 10 and the body component 50.SELECTED DRAWING: Figure 6

Description

The present invention relates to a drill that is integrated by fastening a head component having a cutting edge and a body component having a shank to each other.

Unlike a normal drill (solid drill) in which the cutting edge part and the shank part are physically integrated, the cutting edge part shank part is formed as a separate part and integrated by fastening each part to each other. In the so-called replaceable cutting edge drill, only the cutting edge parts can be replaced according to the degree of wear of the cutting edge and the like.

In the replaceable cutting edge drill, the head part and the body part are fastened together with the head part fixed to the body part using a fastening part such as a screw (screw fastening type) and the head part and the body without using the fastening part. There are two types (self-fastening type) in which both parts are fastened only by fitting the parts. For example, a screw fastening type drill is disclosed in Patent Document 1, and a self-fastening type drill is disclosed in Patent Document 2.

A shaft (or protrusion) is provided at the end of the head component (cutting head 12 in the drawing) disclosed in Patent Document 1, and the shaft is provided as a hole (or depression) in the seat surface provided in the body component. It has a structure that fits into the part). A smooth surface is provided on this shaft, and the head component is fixed by screwing the surface from the outer circumference of the body component.

On the other hand, in the self-fastening type drill disclosed in Patent Document 2, the fastening of the head part and the body part is maintained by the elastic force due to the elastic deformation of both parts. Therefore, a self-fastening type drill generates a large resistance when fitting the head part into the body part, and the head part is attached and detached with a large rotational force (torque) as compared with the case of the screw-fastening type drill. However, unlike the screw fastening type drill disclosed in Patent Document 1, it does not have fastening parts such as screws, so that the number of parts is small.

Japanese Patent No. 6399389 Japanese Patent No. 5519694

However, since the drills disclosed in Patent Documents 1 and 2 both have a shaft provided at the lower part of the head component, it is necessary to provide a hole for inserting the shaft in the body component. Therefore, there is a problem that a sufficient wall thickness cannot be secured at the fastening portion (center portion of the drill) between the head component and the body component. In particular, since the drill disclosed in Patent Document 2 has a hole for inserting the shaft of the head component in the central portion of the body component, a sufficient area (smooth surface) to be installed when the head component is attached to the body component is sufficient. Cannot be secured.

As a result, when the head component is attached to the body component, the head component may rotate and be fastened to the body component while the head component is in an unstable posture. At the same time, the final determination as to whether or not the head parts and body parts have been fastened largely depends on the skill of the operator. If the head part and the body part are not completely fastened, the head part may come off from the body part during use of the drill.

Therefore, in the present invention, when fastening the head component and the body component, the head component is accurately fastened to the body component without providing the shaft necessary for fastening the head component and regardless of the skill of the operator. An object of the present invention is to provide a drill with a replaceable cutting edge.

The replaceable cutting edge drill of the present invention has a head part having a cutting edge and a body part having a shank as the minimum components. The head component includes a seat surface perpendicular to the axial direction of the body component, a vertical wall surface portion located on the rear side in the rotational direction of the drill from the flank surface adjacent to the cutting edge, and the drill adjacent to the vertical wall surface portion. A curved surface portion located on the rear side and the center side in the rotation direction of the above is provided. The curved surface portion is divided into a front curved surface portion that is inclined toward the tip end side of the head component, and a rear curved surface portion that is located on the rear side of the head component with respect to the front curved surface portion and is formed from two or more curved surfaces.

Further, on one end side (opposite side of the shank) of the body component, a seat surface formed over the entire circumference in the axial direction and the circumferential direction of the body component, and two axially extending and facing each other. Each column will be provided. Further, each of these columns has an outer peripheral wall surface portion facing the circumferential direction of the body component and an inner peripheral wall surface portion facing the central axis of the body component.

Then, the vertical wall surface of the head component and the outer peripheral wall surface of the body component are in contact, the rear curved surface portion of the head component and the inner peripheral wall surface portion of the body component are in contact, and the seat surface of the head component and the seat surface of the body component are in contact with each other. Contact with each other A replaceable cutting edge drill in which the head part and body part are fastened to each other.

Further, the front curved surface portion of the head component and the inner peripheral wall surface portion in each column of the body component are separated from each other, and the head component and the body component are brought into contact with each other in a state where the rear curved surface portion of the head component and the inner peripheral wall surface portion of the body component are in contact with each other. A drill with a replaceable cutting edge to be fastened may be used. Further, the seating surface of the body component is an inner peripheral seating surface formed over the entire circumference of the central axis thereof, and two outer peripheral seating surfaces arranged on the outer peripheral side with an annular groove separated from the inner peripheral seating surface. It may be composed of.

The replaceable cutting edge drill of the present invention accurately attaches the head part to the body part without providing the shaft of the head part, which has been required so far when fastening the head part and the body part, and without depending on the skill of the operator. It has the effect of being able to rotate and fasten.

It is a front view of the cutting edge exchange type drill 100. It is a right side view of the cutting edge exchange type drill 100. It is a top view of the cutting edge exchange type drill 100. It is an enlarged view of the tip part of the cutting edge exchange type drill 100 shown in FIG. It is an enlarged view of the tip part of the cutting edge exchange type drill 100 shown in FIG. It is a perspective view from the upper side of the tip portion of the cutting edge exchangeable drill 100. It is a perspective view from the lower side of the tip portion of the cutting edge exchangeable drill 100. It is a right side view of the head component 10. It is a top view of the head component 10. It is a bottom view of the head component 10. It is a perspective view from the tip side of the head component 10. It is a perspective view from the rear end side of a head component 10. It is a top view of the body component 50. It is a perspective view from the upper side of the body component 50.

An embodiment of the replaceable cutting edge drill of the present invention will be described with reference to the drawings. A front view of the replaceable cutting edge drill 100 according to an embodiment of the present invention is shown in FIG. 1, a right side view is shown in FIG. 2, and a plan view is shown in FIG. Further, an enlarged front view of the tip of the replaceable cutting edge drill 100 of FIG. 1 is shown in FIG. 4, and an enlarged right side view of the tip of the replaceable cutting edge drill 100 of FIG. 2 is shown in FIG. FIG. 6 shows a perspective view from the tip side), and FIG. 7 shows a perspective view from the lower side (shank side) of the cutting edge replaceable drill 100.

The replaceable cutting edge drill (hereinafter referred to as “drill”) 100 of the present invention is formed by fastening the head component 10 having a cutting edge and the shaft-shaped body component 50 to each other as shown in FIGS. 1 to 3. This is a so-called self-fastening drill. That is, the drill 100 is fastened by fitting each form of the head component 10 and the body component 50 to each other as shown in FIGS. 4 to 7 without using a component such as a screw. Hereinafter, the structures of the head parts and body parts constituting the drill will be described.

FIG. 8 shows a right side view of the head component 10 constituting the drill 100 according to the embodiment of the present invention, FIG. 9 shows a plan view, and FIG. 10 shows a bottom view. 11 is a perspective view of the head component 10 from the front end side, and FIG. 12 is a perspective view of the head component 10 from the rear end side. The head component 10 that forms a part of the drill of the present invention and substantially carries out the cutting process has two cutting edges 11 and 11 as shown in FIGS. 8 to 11, and is a body component described later. It is attached to one end side (opposite side of the shank) in a removable form.

In the head component 10 shown in FIG. 9 and the like, in addition to the two cutting edges 11 and 11 like a normal drill, flank surfaces 12 and 12 and rake surfaces 13 and 13 connected to the cutting edges 11 and 11 are continuously formed. There is. Thinning surfaces 15 and 15 and grooves 14 and 14 connected to the thinning surfaces 15 and 15 are formed on the rotation rear side of each of the cutting edges 11 and 11 (opposite direction of the arrow shown in FIG. 9: clockwise) as shown in FIGS. 9 and 11. There is.

As shown in FIGS. 9 to 11, the head component 10 is formed with a curved surface portion 30 and a vertical wall surface portion 20. The curved surface portion 30 is a curved surface adjacent to both surfaces of the thinning surface 15 and the groove 14, and the vertical wall surface portion 20 is a surface on the rotation front side (direction of the arrow shown in FIG. 9: counterclockwise) with respect to the curved surface portion 30. .. As shown in FIGS. 5 and 6, these curved surface portions 30 and vertical wall surface portions 20 are portions that come into contact with a part of the body component 50 when the head component 10 is fastened to the body component 50 described later.

As shown in FIGS. 8 and 11, the curved surface portion 30 has a front curved surface portion 31 located on the tip end side (drill advancing side) of the head component 10 and having an inclined shape, and a rear end side (rear end side) of the head component 10. It is formed from a rear curved surface portion 32 located on the shank side of the drill and adjacent to the seat surface 16. Further, as shown in FIGS. 8 to 11, the rear curved surface portion 32 has a plurality of curved surfaces, that is, the first rear curved surface portion 32A located on the rotation front side of the drill, and the drill rotation rearward from the first rear curved surface portion 32A. It is divided into a second rear curved surface portion 32B located on the side. The rear curved surface portion 32 (first rear curved surface portion 32A, second rear curved surface portion 32B) comes into contact with the surface of the column of the body component described later, so that the head component 10 and the body component are tightly fastened.

As shown in FIGS. 8 to 10, the vertical wall surface portion 20 is formed parallel to the central axis O1 of the head component 10, and is generated by the rotation of the drill when it comes into contact with the surface of the column constituting the body component. It is a surface that receives the torque (transmits the rotating force to the head component 10). Further, the seat surface 16 is a surface that contacts the seat surface of the body component described later, and is formed so as to be perpendicular to the axial direction of the drill. At the center position of the seat surface 16, a convex portion 17 for fitting into a concave portion of the seat surface of the body component is provided.

Next, the body parts will be described. FIG. 13 shows a plan view of the body component 50 constituting the drill 100, and FIG. 14 shows a perspective view of the body component 50 from the tip end side. One end side of the body part 50 has a shank attached to the machine tool, the other end side (opposite side of the shank) has two columns 52 and 53 extending in the axial direction, and a groove 54 for discharging chips generated during cutting. Have. As shown in FIGS. 6 and 7, the groove 54 is formed so as to be connected to the groove 14 of the head component to form a single groove when the body component and the head component are fastened to each other. The two columns 52 and 53 are located on the outermost peripheral side in the radial direction of the body component 50, and are arranged so as to face each other.

Further, a seating surface perpendicular to the axial direction of the body component 50 is provided between the columns 52 and 53. There is a recess 57 in the center of the seat surface, and the seat surface of the head component contacts (seats) the seat surface of the body component 50 when the head component is fastened, and the convex portion of the head component fits into the recess 57. The center position of each part is determined by inserting. As a result, when the head component is attached to the body component, the head component can be rotated (toward the reverse rotation direction of the replaceable cutting edge drill) and fastened to the body component while the head component remains in a stable posture.

As shown in FIGS. 13 and 14, the seating surface of the body component 50 is divided into an inner peripheral seating surface 56A and two outer peripheral seating surfaces 56B and 56B via an annular groove 58. The annular groove 58 is connected to the two linear grooves 59, 59, and the linear grooves 59, 59 are formed so as to cross the outer peripheral seat surface 56B2 in the radial direction.

Each column 52, 53 of the body component 50 has two sets (two types) of surfaces that come into contact with the head component when it is fastened to the head component. As shown in FIGS. 13 and 14, the first set of surfaces is parallel to the central axis O2 of the body component 50, and the outer peripheral wall surface is formed so that each surface faces the circumferential direction of the body component 50. Parts 62 and 63. The surfaces of the second set are curved inner peripheral wall surface portions 72 and 73 formed so as to face each other toward the central axis O2 of the body component 50. The inner peripheral wall surface portions 72 and 73 are partially formed with an inclined surface along the front curved surface portion of the head component when the head component and the body component are fastened.

When the head component and the body component are fastened to each other, the outer peripheral wall surface portions 62 and 63 of the body component 50 come into contact with the vertical wall surface portion of the head component, and the inner peripheral wall surface portions 72 and 73 of the body component 50 are behind the head component. Contact the curved surface. When the head component and the body component are fastened to each other, it is preferable that the front curved surface portions 31 and 31 of the head component and the inner peripheral wall surface portions 72 and 73 of the body component 50 are separated from each other. That is, in a drill with a replaceable cutting edge in which the head component and the body component are integrated, a gap is provided between the front curved surface portion of the head component and the inner peripheral wall surface portion of the body component.

This is to reduce the contact resistance between the parts when the head parts are rotated and attached to the body parts. Further, when a drill rotating at high speed is used, an inertial force (propulsive force) in the axial direction is generated in the head component. Since the front curved surface portion of the head component and a part of the inner peripheral wall surface portion of the body component are inclined to each other, the front curved surface portion and the inner peripheral wall surface portion are more closely adhered as the head component is separated from the body component, and between both sides. Friction works. As a result, the head component is prevented from coming out of the body component.

The drill of the present invention may be optionally provided with an oil hole (oil hole) for discharging the lubricant. For example, as shown in FIGS. 13 and 14, in the columns 52 and 53 of the body component 50, oil holes 99 and 99 may be provided so that the lubricant is discharged in the direction of the cutting edge when the head component 10 is fastened. Good.

10 Head parts 11 Cutting edge 12 Escape surface 13 Scoop surface 14, 54 Groove 15 Thinning surface 16 Seat surface 17 Convex part 20 Vertical wall surface part 30 Curved surface part 31 Front curved surface part 32 (32A, 32B) Rear curved surface part 50 Body part 52 53 Column 56A Inner peripheral seating surface 56B Outer peripheral seating surface 57 Recessed 58 Circular groove 59 Linear groove 62,63 Outer peripheral wall surface 72,73 Inner peripheral wall surface 99 Oil hole (oil hole)
100 Replaceable cutting edge drills O1, O2 Central axis

Claims (3)

In a replaceable cutting edge drill having a head part having at least two cutting edges and a body part having a shank.
The head component includes a seat surface perpendicular to the axial direction of the body, a vertical wall surface portion located on the rear side of the flank surface adjacent to the cutting edge in the rotational direction of the replaceable cutting edge drill, and the vertical wall surface portion. A curved surface portion located on the rear side and the center side in the rotation direction of the drill is provided.
The curved surface portion includes a front curved surface portion inclined toward the tip end side of the head component, a rear curved surface portion located on the rear side of the head component on the rear side of the front curved surface portion and formed from two or more curved surfaces. Have and
On one end side of the body component, a seat surface formed over the entire circumference in the axial direction and the circumferential direction of the body, and two columns extending in the axial direction and facing each other are provided. Each column has an outer peripheral wall surface portion facing the circumferential direction of the body and an inner peripheral wall surface portion facing the central axis of the body.
The vertical wall surface portion of the head component and the outer peripheral wall surface portion of the body component are in contact with each other, the rear curved surface portion of the head component is in contact with the inner peripheral wall surface portion of the body component, and the seat surface of the head component and the body are in contact with each other. A cutting edge replaceable drill characterized in that the head component and the body component are fastened to each other by contacting the seat surfaces with each other. The replaceable cutting edge drill according to claim 1, wherein the head component and the body component are fastened to each other with the front curved surface portion of the head component and the inner peripheral wall surface portion of the body component separated from each other. The seating surface of the body component is an inner peripheral seating surface formed over the entire circumference of the central axis thereof, and two outer peripheral surfaces arranged on the outer peripheral side with an annular groove separated from the inner peripheral seating surface. The replaceable cutting edge drill according to claim 1 or 2, wherein the drill is composed of a seat surface.

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