WO2020218110A1 - Blade edge replaceable-type drill - Google Patents

Abstract

Provided is a blade edge replaceable-type drill (100) configured such that a head component (10) can be fastened to a body component (50) in a stable manner without a shaft portion being provided to the head component. This blade edge replaceable-type drill comprises a head component and a body component, wherein the head component is provided with: a vertical wall surface part that is positioned more toward a rear side in the rotation direction of the blade edge replaceable-type drill than a flank adjacent to a cutting blade; and a curved surface part that is positioned more toward the rear side and a center side in the rotation direction of the blade edge replaceable-type drill than the vertical wall surface part. The curved surface part is constituted by a front curved surface part that is inclined toward the leading end side of the head component, and a rear curved surface part that is positioned more toward a rear end side of the head component than the front curved surface part. Two columns are provided opposing each other at one end side of the body component, and each column has an outer peripheral wall surface part and an inner peripheral wall surface part. The head component and the body component are fastened to each other by bringing the vertical wall surface part of the head component and the outer peripheral wall surface part of the body component into contact and bringing the rear curved surface part of the head component and the inner peripheral wall surface part of the body component into contact.

Description

Replaceable cutting edge drill

The present invention relates to a drill that is integrated by fastening a head part having a cutting edge and a body part 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 and the shank part are formed as separate parts and integrated by fastening each part to each other. In addition, the so-called replaceable cutting edge drill can replace only the cutting edge parts 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 is provided at the end of the head component (cutting head 12 in the drawing) disclosed in Patent Document 1, and the shaft is fitted into a hole in a seat surface provided in the body component. ing. 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. That is, in the self-fastening type drill, a large resistance is generated when the head part is fitted into the body part. Therefore, although a large amount of rotational force (torque) is required for attaching and detaching the head part as compared with the case of the screw fastening type drill, unlike the screw fastening type drill disclosed in Patent Document 1, screws and the like are used. Since it does not have fastening parts, it is characterized by a small number of parts.

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 part, it is necessary to provide a hole for inserting the shaft in the body part. 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 center 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 attaching the head part to the body part, there is a possibility that the head part is rotated and fastened to the body part while the head part is in an unstable posture. In addition, 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 body part are not completely fastened, the head part may come off the body part during use of the drill.

Therefore, it is an object of the present invention to provide a cutting edge replaceable drill that can easily and accurately fasten a head part to a body part regardless of the skill of an operator when fastening the head part and the body part.

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 bearing surface perpendicular to the axial direction of the head component, a vertical wall surface portion located rearward 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 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 at the rear end of the head component with respect to the front curved surface portion.

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

Then, 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 and the inner peripheral wall surface portion of the body component are in contact with each other, and the seat surface of the head component and the seat surface of the body component are in contact with each other. The surfaces should be in contact with each other. A drill with a replaceable cutting edge in which the head part and the 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 in 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 fastened replaceable cutting edge drill may be used.

The replaceable cutting edge drill of the present invention stabilizes the head component because the head component and the body component, which are constituent components, are provided with a bearing surface radially centered on a convex portion in the center of the head component and a concave portion in the center of the body component. It can be attached by contacting the seating surface of the body parts in this posture. Therefore, the head component can be accurately installed on the body component without depending on the skill of the operator, and can be easily fastened by rotating the head component.

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 the upper side perspective view of the tip part of the cutting edge exchange type drill 100. It is a lower side perspective view of the tip part of the cutting edge exchange type drill 100. It is a front view of the head component 10. 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 front end perspective view of a head component 10. It is a rear end perspective view of a head component 10. It is a front view of the body component 50. It is a right side view of the body component 50. It is a top view of the body component 50. FIG. 14 is an enlarged view of the tip of the body component 50 shown in FIG. FIG. 15 is an enlarged view of the tip of the body component 50 shown in FIG. It is an upper perspective view of the body component 50. It is a lower perspective view 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 on the upper side of the replaceable cutting edge drill 100. FIG. 6 shows a perspective view from the tip side), and FIG. 7 shows a perspective view from the lower side (rear end 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.

8 is a front view of the head component 10 constituting the drill 100 according to the embodiment of the present invention, 9 is a right side view, 10 is a plan view, and 11 is a bottom view. Further, FIG. 12 shows a perspective view of the head component 10 from the front end side, and FIG. 13 shows 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. 10 and 12, and is a body component described later. It is attached to one end (opposite the shank) in a removable form.

In the head component 10 shown in FIG. 8 and the like, in addition to the two cutting edges 11 and 11 like a general drill, flank surfaces 12 and 12 and rake surfaces 13 and 13 connected to the cutting edges 11 and 11 are continuously formed. ing. Thinning surfaces 15 and 15 and grooves 14 and 14 connected to the thinning surfaces 15 and 15 are formed on the counter-rotation direction side of each of the cutting edges 11 and 11 (opposite direction of the arrow shown in FIG. 10: clockwise) as shown in FIGS. 10 and 12. ing.

The head component 10 is formed with a curved surface portion 30 and a vertical wall surface portion 20 as shown in FIGS. 9, 10 and 12. 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 direction side (direction of the arrow shown in FIG. 10: 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. 9 and 12, the curved surface portion 30 is formed of a front curved surface portion 31 and a rear curved surface portion 32, and is arranged adjacent to each other. The front curved surface portion 31 is located closer to the tip end side (drill advancing side) of the head component 10 than the rear curved surface portion 32, and has a shape inclined toward the tip end side of the drill. The rear curved surface portion 32 is located on the rear end side (drill shank side) of the head component 10 with respect to the front curved surface portion 31, and is a curved surface adjacent to the seat surface 16 as shown in FIGS. As shown in FIG. 12, they are formed parallel to the direction of the drill axis (central axis O1 of the head component 10 shown in FIGS. 8 and 9). Further, the rear curved surface portion 32 plays a role of tightly fastening the head component 10 and the body component by coming into contact with the surface of the column of the body component described later.

As shown in FIGS. 8 and 9, the vertical wall surface portion 20 is a surface formed parallel to the central axis O1 of the head component 10, and is formed on the side opposite to the rotation direction of the cutting edge 11. As shown in FIGS. 5 and 6, it plays a role of receiving the torque generated by the rotation of the drill (transmitting the rotating force to the head component 10) by coming into contact with the surface of the column constituting the body component described later. ..

Further, as shown in FIGS. 11 and 13, a convex portion 17 is formed at one end of the head component 10, and when the convex portion 17 is fastened to the body component described later, the convex portion 17 is located at the center of the seat surface of the body component. It fits into the provided recess. Around the convex portion 17, a seat surface 16 is integrally formed in the radial direction and the circumferential direction of the head component 10 so as to surround the convex portion 17 so as to be perpendicular to the axial direction of the head component 10. There is. The seat surface 16 of the head component 10 comes into contact with the seat surface of the body component when it is fastened to the body component.

Next, the body parts will be described. A front view of the body component 50 constituting the drill 100 is shown in FIG. 14, a right side view is shown in FIG. 15, and a plan view is shown in FIG. 14 is an enlarged view of the tip of the body component 50, FIG. 15 is an enlarged view of the tip of the body component 50 shown in FIG. 15, and FIG. 19 is a perspective view of the body component 50 from the tip side. A perspective view from the rear end side of the 50 is shown in FIG.

As shown in FIGS. 14 to 16, one end of the body component 50 is a shank 51 attached to a machine tool, and the other end (opposite side of the shank 51) is two columns 52 and 53 extending in the axial direction, during cutting. It has a groove 54 for discharging the generated chips. 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. As shown in FIGS. 16 to 20, 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, as shown in FIGS. 16 and 19, a seating surface 56 perpendicular to the axial direction of the body component 50 is provided between the columns 52 and 53. The seat surface 56 is integrally formed around the recess 57 so as to surround the recess 57 in the radial direction and the circumferential direction of the body component 50. As shown in FIGS. 4 to 7, the seat surface of the head component of the body component 50 comes into contact with the seat surface 56 of the body component 50 when it is fastened to the head component. 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.

Further, as shown in FIGS. 16 and 19, there is a recess 57 in the center of the seat surface 56 of the body component 50. Therefore, when the seat surface of the head component comes into contact with the seat surface 56 of the body component 50 at the time of fastening to the head component, the convex portion of the head component fulfills the function of positioning in the radial direction of the head component, and the concave portion of the body component 50. By easily fitting into the 57, the stable posture of the head component in the body component 50 can be maintained.

Each column 52, 53 of the body component 50 has two sets (two types) of surfaces that come into contact with each other when fastening to the head component. As shown in FIGS. 16 to 20, 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. An inclined surface along the front curved surface portion of the head component is formed on a part of the inner peripheral wall surface portions 72 and 73 when the head component and the body component are fastened.

When the head component and the body component 50 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 portions of the head component, and the inner peripheral wall surface portions 72 and 73 of the body component 50 are head components. Contact the rear 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 the cutting edge replaceable drill in which the head component and the body component are fastened to each other, 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 surface portion are separated from the body component even if the head component receives an external force along the traveling direction of the drill. Friction force acts between both sides by further adhering the peripheral wall surface. As a result, the head component is prevented from coming out of the body component.

Further, 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. 6 and 19, 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.

The front curved surface portion of the head component constituting the present invention changes in inclination at a constant rate when viewed in the axial cross section of the head component 10 as shown in FIGS. 8 and 12 as an embodiment. It shows a linear linear shape. As another shape, a so-called curved shape (a shape that becomes a curved surface in an axial cross-sectional view) in which the inclination of the head component 10 in the axial direction changes in a linear curve, an exponential function, or a parabola may be used. Absent.

Further, as shown in FIGS. 11, 13, 16, 16, 19 and the like, the shape of each seating surface of the head component and the body component constituting the present invention is such that the convex portion 17 is centered on the convex portion 17 and the concave portion 57. The shape extends from the periphery of the concave portion 57 to the outer peripheral edge of the head component and the body component, but it may be formed at least around the convex portion 17 and the concave portion 57.

10 Head parts 11 Cutting edge 12 Escape surface 13 Scoop surface 14,54 Groove 15 Thinning surface 16,56 Seat surface 17 Convex part 20 Vertical wall surface part 30 Curved surface part 31 Front curved surface part 32 Rear curved surface part 50 Body parts 51 Shank 52, 53 Column 57 Recesses 62, 63 Outer wall surface 72, 73 Inner wall surface 99 Oil hole (oil hole)
100 Replaceable cutting edge drill 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 head component, 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. A curved surface portion located on the rear side and the center side in the rotation direction of the drill is provided with respect to the portion.
The curved surface portion is located on the rear end side of the head component with respect to the front curved surface portion inclined toward the tip end side of the head component and is parallel to the central axis of the head component. It has a rear curved surface part formed on the
On one end side of the body component, a seat surface formed in the radial direction and the circumferential direction of the body component, and two seat surfaces extending axially from the circumferential peripheral portion of the seat surface and facing each other. A column and a column are provided, and each column 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.
The vertical wall surface of the head component and the outer peripheral wall surface 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 component are in contact with each other. A drill with a replaceable cutting edge, characterized in that the head component and the body component are fastened to each other by contacting the bearing surfaces of the drill. 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. .. A convex portion is provided at one end of the head component, and the seating surface of the head component is integrally formed around the convex portion so as to surround the convex portion in the radial direction and the circumferential direction of the head component. And has a recess on one end side of the body component, the seating surface of the body component is integrated so as to surround the recess in the radial direction and the circumferential direction of the body component with the recess as the center. 1 or 2, wherein the head component and the body component are fastened to each other by contacting the seat surface of the head component and the seat surface of the body component with each other. The described cutting edge replaceable drill.

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