JP2000005914A - Drill and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill cutting well while enhancing the durability of the end of its blade and resisting material baking. SOLUTION: A drill 1 has a base member 2 and an end member 3 soldered to its end. Chip discharge grooves 31, 31 continuing with chip discharge grooves 41, 41 are formed in the shape of U in the body part 4 of the end member 3. Blade bodies 32, 32 continuing with the twisted parts 42, 42 of the body part 4 are provided between the chip discharge grooves 31, 31. Guide grooves 6, 6 tilted downward toward the bases of the blade bodies 32, 32 are formed at the ends of the blade bodies 32, 32 in the opposite direction to the direction of rotation. The bottom 61 of the guide grooves 6, 6 is formed rectilinearly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a wood-based system,
The present invention relates to a drill used for drilling a ceramic, metal or plastic material and a method for manufacturing the same. More specifically, it is sharp and improves the durability of the blade tip,
Further, the present invention relates to a drill which does not easily cause material burning and a method for manufacturing the drill.

[0002]

2. Description of the Related Art An electric drill, a corner-only machine, or the like is mainly used for drilling a material such as wood, ceramic, metal or plastic. Various tip tools having a cutting function are mounted on the chuck portion of the electric drill or the corner-only machine. One example is a drill in which a chip discharge groove is formed from the base side to the tip side.

[0003] In order to increase the cutting efficiency of the drill, etc.
Japanese Patent Application Laid-Open No. Hei 4-30 discloses a technique in which the tip of the blade body is devised.
No. 4957.

[0004] A guide groove for guiding a part of the chips generated by cutting the workpiece to the chip discharge groove and discharging the chips is formed at the tip of the blade body of the drill disclosed in the above publication. The guide groove is inclined toward the blade body base side in a direction opposite to the rotation direction. As shown in FIG. 13, the guide groove has a rotating grindstone 16 having a V-shaped convex cross-sectional outer peripheral shape.
From the direction of the rotation shaft 161 in a direction parallel to the axial direction of the drill, by pressing the blades 17, 17 into the distal end portions.

[0005]

However, when the tip of the blade body of the drill is formed by the above-described method, the outer shape of the rotary grindstone 16 appears in the guide groove as it is, and the bottom of the guide groove has a concave arc shape. It is formed. When the workpiece is cut with such a drill, a part of the chips generated during the cutting of the workpiece moves along the concave arc-shaped guide groove and moves back to the workpiece. . For this reason, rapid discharge of the chips is hindered, and the frictional resistance of the drill increases, which adversely affects the sharpness of the drill.

When the frictional resistance of the drill increases, the blade 1
Heat is likely to be generated at the tips of the blades 7 and 17,
17 was consumed and the material was burned.

Accordingly, an object of the present invention is to improve the sharpness, improve the durability of the blade tip, and prevent the material from burning, and to improve the sharpness of the drill. An object of the present invention is to provide a method for forming a part.

[0008]

Means of the present invention taken to achieve the above object are as follows. In the first invention, the base member has a required number of chip discharge grooves formed from the base side to the tip side, and a tip member provided at a tip portion of the base member. In the tip member,
A chip discharge groove provided continuously with the chip discharge groove of the base member, and a blade body provided between the chip discharge groove and the chip discharge groove. Is a drill in which a guide groove inclined toward the blade body base side in the opposite direction is formed, wherein the bottom of the guide groove is formed in a substantially linear shape, is there.

According to a second aspect of the present invention, there is provided a required number of chip discharge grooves formed from the base side to the tip side, and a blade body provided between the chip discharge grooves. And, a drill having a guide groove formed at the distal end portion inclined toward the blade body base in a direction opposite to the rotation direction, wherein the bottom of the guide groove is formed in an essentially linear shape. A drill characterized in that it is a drill.

According to a third aspect of the present invention, the peripheral surface of the blade body includes a portion formed such that the radius decreases from the rotation direction side to the direction opposite to the rotation direction. A drill according to the first or second invention.

According to a fourth aspect of the present invention, a thinning surface is formed at the tip of the blade body so as to be continuous with the chip discharge groove. The drill according to the above.

According to a fifth aspect of the present invention, there is provided a base member having a required number of chip discharge grooves formed from a base side to a front end side, and a tip member provided at a front end of the base member. The tip member has a chip discharge groove provided continuously with the chip discharge groove of the base member, and a blade body provided between the chip discharge groove and the chip discharge groove. At the tip, a drill is formed in which a guide groove that is inclined toward the blade body base side in the direction opposite to the rotation direction is formed, and the peripheral surface of the blade body is formed by a plurality of planes having different angles in the circumferential direction. A drill including a configured flank, and formed so that a radius decreases from a rotation direction side toward a direction opposite to the rotation direction.

According to a sixth aspect of the present invention, there is provided a drill including a base member having a chip discharge groove formed therein, and a tip member provided at a tip portion of the base member. A drill characterized in that one or both of the bonding surfaces are provided with a recess and brazed.

According to a seventh aspect of the present invention, the rotating grindstone and / or the drill are linearly moved along a linear direction intersecting the axial direction of the drill at a required angle to cut the tip end of the blade body. A method for manufacturing a drill, comprising a step of forming a linear guide groove in a linear manner.

According to an eighth aspect of the present invention, there is provided a method of manufacturing a drill including a base member having a chip discharge groove formed therein, and a tip member provided at a tip portion of the base member. A method for manufacturing a drill, comprising a step of providing a recess in one or both of the bonding surfaces of a tip member and brazing.

In the method for manufacturing a drill according to a seventh aspect of the present invention, the method for forming the tip of the blade body includes a case where the rotary grindstone is fixed and only the drill side moves, and a case where the drill side is fixed and only the rotary grindstone moves. , And both the rotating wheel and the drill side may move.

In the method of manufacturing a drill according to the eighth invention, the shape of the concave portion provided on one or both of the bonding surfaces of the base member and the tip member is, for example, such that a groove is provided in a diameter line direction of the bonding surface. The shape, the shape in which grooves are provided radially, such as a cross, the shape in which circular concave portions are provided, etc., are not particularly limited as long as the shape allows silver solder as an adhesive to enter. .

(Operation) In the drill according to the present invention, the bottom of the guide groove is formed to be essentially straight. Therefore,
Part of the chips generated by cutting the workpiece is quickly and linearly discharged from the cut portion along the guide groove. For this reason, the frictional resistance of the drill is reduced as compared with the conventional drill, and drilling by high-speed rotation can be performed smoothly.
Further, since the frictional resistance of the drill is reduced, the heat accumulated at the tip of the blade body is suppressed, and wear of the tip of the blade body and burning of the material are less likely to occur.

In a drill including a portion in which the radius of the blade body is reduced from the rotation direction side of the blade body to the direction opposite to the rotation direction, the radius of the blade body is reduced by the portion. Therefore, the contact area between the hole and the peripheral surface of the hole formed by cutting can be reduced, so that the frictional resistance of the drill can be reduced and the hole can be smoothly drilled by high-speed rotation.

In a drill having a thinning surface formed at the tip end of the blade body and continuous with the chip discharge groove, the thrust required for cutting is reduced, and drilling by high-speed rotation can be performed smoothly.

The peripheral surface of the blade body includes a flank formed by a plurality of planes having different angles in the circumferential direction, and is formed so that the radius decreases from the rotation direction side in the direction opposite to the rotation direction. In a drill, for example, since the angle of the peripheral surface changes abruptly from plane to plane, unlike the case where the peripheral surface is formed in an arc shape in the direction in which the radius decreases, chips etc. guided along the peripheral surface Good separation. Therefore, it is possible to reduce the incorporation of extra chips by the peripheral surface of the blade body and the adhesion of chips and resin (resin) to the peripheral surface.

In a drill in which the base member and the tip member are brazed by providing a recess in one or both of the bonding surfaces,
When each member is bonded, an adhesive solder (for example, silver solder) enters the recess and hardens. Thereby, the bonding surface is widened and the bonding strength is increased. In addition, the brazing of the hardened portion that has entered the recess becomes a stopper, so to speak, when processing the tip member in manufacturing, it is possible to prevent the tip member from falling off from the brazed portion even if a large force is applied by a rotating grindstone or the like. .

[0023]

Embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of a drill according to the present invention, FIG. 2 is a plan view of the drill shown in FIG. 1, FIG. 3 is an enlarged front view of the tip of the drill shown in FIG. FIG. 4 is an enlarged plan view of a tip member of the drill shown in FIG. 3.

The drill 1 has a base member 2 and a tip member 3 brazed to the tip. The base member 2 is formed of a general steel member, and has a body portion 4 and a shank portion 5. On the other hand, the tip member 3 is formed of a cemented carbide and has a slightly larger diameter than the body portion 4.

The body part 4 has two chip discharge grooves 41, 4.
1 is formed. The chip discharge grooves 41 have a predetermined twist angle from the shank portion 5 toward the tip end of the body portion 4. The remaining portions of the chip discharge grooves 41 are the same number of torsion portions 42. In addition, the twist part 4
The ends of the rotation directions 2 and 42 are cut off at the inclined surface 4 with the corners removed.
22, 422 (one is not visible in the figure).
The lower end surface of the shank portion 5 has a fastening screw 51 having a predetermined length for attaching the drill 1 to a machine only at a corner.

The tip member 3 has a chip discharge groove 4 of the body 4.
The chip discharge grooves 31, 31 which are continuous with the chips 1, 41 are ground in a “U” shape. Between the chip discharge groove 31 and the chip discharge groove 31, there are blade bodies 32, 32 that are continuous with the twisted portions 42, 42 of the body portion 4. At the boundary between the blade bodies 32, 32 and the chip discharge grooves 31, 31, there are cutting blades 320, 320.

At the tip of the blades 32, 32, the blades 32, 32 are moved in the direction opposite to the rotation direction (the direction of arrow A).
Guide grooves 6 and 6 are formed which are inclined downward toward the base. The bottom portions 61 of the guide grooves 6, 6 are formed linearly.

Therefore, a part of the chips generated by cutting the workpiece is quickly and linearly discharged along the guide grooves 6. For this reason, the frictional resistance of the drill 1 is reduced, and drilling by high-speed rotation can be performed smoothly. In addition, since the frictional resistance of the drill 1 is reduced, the heat accumulated at the distal end portions of the blade bodies 32, 32 is suppressed, so that the distal end portions of the blade bodies 32, 32 are less likely to be consumed and the material is scorched.

At the ends of the guide grooves 6 and 6 on the rotation direction side, an inner cutter 7 is formed on the center axis side of the drill 1 and an outer cutter 8 is formed on the outer peripheral side. The inner blade 7 plays a role of digging a hole, and the outer blade 8 plays a role of wiping the side of the hole to form a beautiful round hole.

The crossing lines between the guide grooves 6, 6 and the outer peripheral surfaces of the distal ends of the blades 32, 32 form round-shaped round hair pulling blades 9, 9, respectively. The round hair pulling blades 9, 9 are gently inclined in the chip discharge direction in order to suppress frictional resistance to the workpiece (see FIG. 3).

Further, the peripheral surface portions 321, 3 of the blade bodies 32, 32
As shown in FIG. 4, 21 is formed so that the radius gradually decreases from the cutting blades 320, 320 at the ends of the blades 32, 32 on the rotation direction side in the direction opposite to the rotation direction. I have. As a result, the contact area between the peripheral surface portions 321 and 321 and the peripheral surface of the hole formed by cutting is reduced, and the frictional resistance of the drill 1 is reduced, so that drilling by high-speed rotation can be performed smoothly. In the present embodiment, the processing for reducing the radius is performed from the rear part of the cutting blades 320, 320. This position is preferable from the viewpoint of the effect of reducing the frictional resistance, but whether or not to perform the processing can be selected depending on the properties of the drill and the conditions of use, etc. Any position can be selected.

Thinning surfaces 10, 10 are formed at the tips of the blades 32, 32 so as to be continuous with the chip discharge grooves 31, 31, respectively. As a result, the thrust required for cutting the drill 1 can be reduced, and drilling by high-speed rotation can be performed smoothly.

Next, a method of forming the tip of the blade body, which constitutes the method of manufacturing a drill, will be described with reference to the drawings. FIG. 5 is a perspective view of a drill showing a state in which only a chip discharge groove is formed in a tip member and before a guide groove or the like is formed, FIG. 6 is a schematic explanatory view of a blade body grinder, and FIG. 7 is grinding of a guide groove. FIG. 8 is an explanatory view showing the state, FIG. 8 is an explanatory view showing a grinding state of the thinning surface in FIG. 7, FIG. 9 is an explanatory view showing a grinding state of the thinning surface, and FIG.

In the drill base D shown in FIG. 5, only the chip discharge groove 31a is formed in the tip member, and the guide grooves 6, 6 are formed.
This is a state before the thinning surfaces 10, 10 and the like are formed. The chip discharge groove 31a is ground in the grinding process of the tip member 3 as described later. Among the constituent members of the drill base D, the blade bodies 32a, 32a and the chip discharge groove 31
Since the structure is the same as that of the drill 1 except for a and 31a (both before the guide groove 6, the thinning surface 10, etc. are formed), the same reference numerals are given and the description is omitted.

The blade body grinding machine (see FIG. 6) for grinding the tip of the drill base D includes a grinding device 11 on which a rotary grindstone 111 is mounted, and a holding device 12 for holding the drill base D. ing. Grinding device 11 and holding device 1
Numeral 2 is movable in all directions necessary for grinding the blade bodies 32,32.

The rotating grindstone 111 has a V-shaped cross section. As the rotating grindstone 111, a diamond grindstone, a borazon grindstone, or the like is appropriately used depending on the material of the tip of the blade bodies 32a, 32a on the side to be cut.

The holding device 12 is provided with a chuck 121 for inserting and holding the shank 5 of the drill base D, and a rotating part 122 for rotating the chuck 121 about the center axis of the drill base D. I have.

The movements of the grinding device 11 and the holding device 12 are controlled by a control device (not shown). The grinding device 11 and the holding device 12 move together, or one of them is fixed, and the other moves.

A method of grinding the drill base D by the blade grinder will be described. (1) Insert the shank portion 5 of the drill base D with the tip member 3 brazed to the distal end into the chuck part 121, and hold the drill base D by the holding device 12 (see FIG. 6).

(2) Chip discharge grooves 31a, 31a are formed at two places on the side of the tip member by a grinding tool (not shown) (the state of FIG. 5).

(3) While maintaining the inclination angle between the grinding direction I of the rotary grindstone 111 and a line II perpendicular to the central axis of the body part 4 at α degrees, the tip of the rotary grindstone 111 and the blade 32a is maintained. Are relatively moved to cut the tip of the blade body 32a (see FIG. 7). As a result, a guide groove 6 is formed at the tip end of the blade body 32a, which is inclined toward the base side of the blade body 32a in a direction opposite to the rotation direction of the drill, and the bottom portion 61 becomes linear.

(4) Due to the rotation of the rotating part 122 of the holding device 12, the drill base D is rotated by 180 ° about the central axis. Then, in the same manner as in step (3), the other blade 3
A guide groove 6 is also formed at the tip of 2a.

(5) Subsequently, after the rotary grindstone 111 moves to the center position of the chip discharge groove 31a (see FIG. 9), the grinding direction I of the rotary grindstone 111 and a line II perpendicular to the central axis of the body part 4 While maintaining the inclination angle of β with the chip discharge groove 3
The thinning is performed by moving the tip side of 1a. This allows
A thinning surface 10 is formed at the tip of the blade body 32a so as to be continuous with the chip discharge groove 31a. Further, the rotating body 122 of the holding device 12 rotates the drill base D by 180 ° about the central axis. And the other chip discharge groove 31a
Is thinned, and a thinning surface 10 is similarly formed.

(6) By grinding the peripheral surfaces of the blades 32a, 32a using another rotating grindstone (not shown),
The peripheral surfaces of the blade bodies 32a, 32a are formed so that the radius decreases from the cutting blades 320, 320 on the rotation direction end side of the blade bodies 32a, 32a in the direction opposite to the rotation direction.

The inclination angles α and β are set in advance, and the control device performs the grinding according to the set angles. Also,
The chip discharge grooves 41 of the drill 1 may be formed straight without being twisted from the base side to the tip side.

FIG. 11 is a perspective view of the tip of a drill according to a second embodiment of the present invention. In the drawings, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals. The description of the parts shown in the first embodiment will be omitted, and different points will be mainly described.

The drill 1a is formed of a general steel member, and is mainly used as a woodworking drill. In the drill 1a, two chips discharge grooves 14, 14 are formed continuously from the base side of the drill 1a to the tip side, and the chips discharge grooves 14, 14 have a predetermined twist angle.

The same number of blades 15, 15 are provided between the chip discharge grooves 14. Blade body 15, 1
5, the cutting blades 151 and 15 are provided on the rotation direction (direction of arrow A).
1 (one is not visible in the figure) is formed. The cutting blades 151 and 151 have a role of wiping the side of the hole and forming a beautiful round hole similarly to the outer blades 8 and 8.

The guide grooves 6, 6 and the thinning surfaces 10, 10 of the drill 1a are formed in the same manner as the guide grooves 6, 6, and the thinning surfaces 10, 10 of the drill 1 shown in the first embodiment. Works similarly. In addition, the blade body 15, 1
5 with the cutting blades 151 and 151 at the ends on the rotation direction side.
From the direction of rotation to the direction opposite to the rotation direction, the radius is gradually reduced, so that the contact area between the peripheral surface and the peripheral surface of the hole to be cut is reduced as in the case of the drill 1, Drilling by high-speed rotation can be performed smoothly by reducing the frictional resistance of the drill 1a. This is the same as in the first embodiment.

FIG. 12 is a perspective view showing a third embodiment of the drill according to the present invention. In the drawings, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals. The description of the parts shown in the first embodiment will be omitted, and different points will be mainly described.

The drill 1b has a base member 2 and a tip member 3b brazed to the tip. Tip member 3b
The brazing surface 30 is provided with a groove 33 having a U-shaped cross section in the diameter direction. Both ends of the concave groove 33 penetrate the peripheral surface of the tip member 3b. The dimensions of the concave groove 33 are, for example, a groove width of 0.2 to 0.3 mm and a groove depth of 0.3 to 0.5 mm, but are not limited thereto and may be set as appropriate.

According to this structure, since the solder enters the concave groove 33 and is hardened, the bonding surface is widened, and the bonding strength between the base member 2 and the tip member 3b is increased. In addition, the solder in the hardened portion that has entered the concave groove 33 becomes a stopper, so to speak, when the tip member 3b is processed in the manufacturing process described below.
Even if a large force is applied by the rotation of the rotary grindstone, the tip member 3b can be prevented from falling off from the brazed portion.

FIG. 13 is a perspective view showing a fourth embodiment of the drill according to the present invention, and FIG. 14 is a schematic plan view of a tip member of the drill shown in FIG. In the drawings, FIG.
The same reference numerals are given to the same and the same portions as the tip member 3 shown in FIG. Drill 1c is the drill 1, 1b
Is a reverse rotation type in which the spiral direction of the torsion portion 42 is reversed. In the tip member 3c, a flank 34 is provided on the blade body 32, 32 in a direction opposite to the rotation direction of the peripheral surface portion 321. Each flank 34 is formed by three planes 341, 342, and 343 having different angles in the circumferential direction, and is formed so that the radius decreases in the direction opposite to the rotation direction.

The structure of the tip member 3c of the drill 1c is partially different from the tip member 3 of the drill 1 and the tip member 3b of the drill 1b. That is, in the drill 1c, the bottom 6
1 is provided from the cutting blade 320 to the blade body rear end 322. Also, the bottom 6 of the thinning surface 10 in plan view.
The angle to 1 is also different from drills 1 and 1b. Further, the top portion 90 (see FIG. 14) of the round hair pulling blade 9 is provided closer to the center in the circumferential direction of the blade body 32 than the drills 1 and 1b. The tip member 3c can have the same structure as the tip members 3 and 3b, and conversely, the tip members 3 and 3b can have the same structure as the tip member 3c.

The starting point of the flank 34 is shifted toward the blade rear end 322 from the top 90 of the round hair pulling blade 9. Further, the peripheral surface portion 321 is provided in an arc shape in a direction in which the radius becomes smaller up to the start point of the flank surface 34. Note that the starting point of the flank 34 may be aligned with the position of the top 90, but may be provided closer to the cutting blade 320 than the position of the top 90.
Inferior in function and not preferred.

In the tip member 3c of this structure, the angle of the peripheral surface portion 321 is different from that of the flat surfaces 341, 342, and 343, unlike, for example, the entire peripheral surface portion 321 is formed in an arc shape in a direction in which the radius becomes smaller. Therefore, the clearance of the swarf and the like guided along the peripheral surface portion 321 on the flank 34 is good. Therefore, the peripheral surface portion 3 of the blade body 32
Since it is possible to reduce the incorporation of extra chips by 21 and the adhesion of chips and resin (resin) to the peripheral surface portion 321 (including the flank 34), the cutting efficiency is not easily reduced.

It should be noted that the terms and expressions used in the present specification are merely illustrative, not restrictive, and do not exclude the terms and expressions equivalent to the above terms and expressions. Further, the present invention is not limited to the illustrated embodiment, and various modifications are possible within the scope of the technical idea.

[0058]

The present invention has the above configuration and has the following effects. (A) In the drill according to the present invention, in which the bottom of the guide groove at the tip of the drill is essentially straight, a part of the chips generated by cutting the workpiece is linearly cut from the cut portion along the guide groove. Is quickly discharged. For this reason, the frictional resistance of the drill is reduced as compared with the conventional drill, and drilling by high-speed rotation can be performed smoothly. Further, since the frictional resistance of the drill is reduced, the heat accumulated at the tip of the blade body is suppressed, and wear of the tip of the blade body and burning of the material are less likely to occur.

(B) In a drill including a portion in which the radius of the blade body is reduced from the rotation direction side of the blade body to the direction opposite to the rotation direction, the radius of the blade body is reduced by the portion. The contact area between the peripheral surface of the drill and the peripheral surface of the hole formed by cutting can be reduced, so that the frictional resistance of the drill can be reduced and the drilling by high-speed rotation can be performed smoothly.

(C) With a drill having a thinning surface formed continuously with a chip discharge groove at the tip of the blade body, the thrust required for cutting is reduced, and drilling by high-speed rotation can be performed smoothly. .

(D) The tip of the blade is cut by moving the rotary grindstone and / or the drill linearly along a linear direction intersecting the axial direction of the drill at a required angle. Therefore, an essentially linear guide groove can be easily formed.

(E) The peripheral surface of the blade body includes a flank formed by a plurality of planes having different angles in the circumferential direction, and is formed such that the radius decreases from the rotation direction side in the direction opposite to the rotation direction. In drills that are performed, for example, unlike a drill whose peripheral surface is formed in an arc shape in a direction in which the radius becomes smaller, the angle of the peripheral surface changes abruptly for each plane, so that the drill is guided along the peripheral surface. Good separation of chips and the like. Therefore,
It is possible to reduce the entrapment of extra chips by the peripheral surface of the blade body and the attachment of chips and resin (resin) to the peripheral surface, so that the cutting efficiency is not easily reduced.

(F) In a drill in which the base member and the tip member are brazed by providing a concave portion on one or both of the bonding surfaces, when the members are bonded, the solder as an adhesive enters the concave portion and hardens. . Thereby, the bonding surface is widened and the bonding strength is increased. In addition, the brazing of the hardened portion that has entered the recess becomes a stopper, so to speak, when processing the tip member in manufacturing, even if a large force is applied by a rotating grindstone, etc.
The tip member can be prevented from falling off from the brazed portion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a drill according to the present invention.

FIG. 2 is a plan view of the drill shown in FIG.

FIG. 3 is an enlarged front view of the tip of the drill shown in FIG. 1;

FIG. 4 is an enlarged plan view of a tip member of the drill shown in FIG. 3;

FIG. 5 is a perspective view of a drill showing a state in which only a chip discharge groove is formed in a tip member and before a guide groove and the like are formed.

FIG. 6 is a schematic explanatory view of a blade body grinding machine.

FIG. 7 is an explanatory diagram showing a grinding state of a guide groove.

FIG. 8 is a view as viewed in the direction of arrow B in FIG. 7;

FIG. 9 is an explanatory view showing a grinding state of a thinning surface.

FIG. 10 is a view taken in the direction of arrow C in FIG. 9;

FIG. 11 is a perspective view of a tip showing a second embodiment of the drill according to the present invention.

FIG. 12 is a perspective view showing a third embodiment of the drill according to the present invention.

FIG. 13 is a perspective view showing a fourth embodiment of the drill according to the present invention.

FIG. 14 is a schematic plan view of a tip member of the drill shown in FIG.

FIG. 15 is an explanatory view showing a grinding state of a guide groove in a conventional drill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drill 2 Base member 3 Tip member 31 Chip discharge groove 32 Blade body 320 Cutting blade 321 Peripheral surface part 4 Body part 41 Chip discharge groove 42 Twisted part 422 Inclined surface 5 Shank part 6 Guide groove 61 Bottom part 7 Inner blade 8 Outer blade 9 Round Hair pulling blade 10 Thinning surface D Drill base 31a Chip discharge groove 32a Blade body 11 Grinding device 111 Rotating grindstone 12 Holding device 121 Chuck part 122 Rotating part 1a Drill 14 Chip discharge groove 15 Blade body 151 Cutting blade 16 Rotating grindstone 161 Rotating shaft 17 Blade body 1b Drill 3b Tip member 30 Adhesive surface 33 Concave groove 1c Drill 3c Tip member 34 Relief surface 341, 342, 343 Plane 90 Top 322 Blade body rear end

Claims (8)

[Claims] 1. A base member (2) in which a required number of chip discharge grooves (41, 41) are formed from a base side to a front end side, and a tip provided at a front end of the base member (2). A member (3), and the tip member (3) has a chip discharge groove of the base member (2).
Chip discharge grooves (31, 31) provided continuously with (41, 41),
Blade body provided between chip discharge groove (31) and chip discharge groove (31)
(32, 32), and the leading end of the blade body (32, 32) has a guide groove inclined toward the blade body base in a direction opposite to the rotation direction.
A drill in which (6,6) is formed, wherein the bottom (61,61) of the guide groove (6,6) is formed in an essentially straight line. 2. A required number of chip discharge grooves (14, 14) formed from the base side to the tip side, and a blade provided between the chip discharge grooves (14) and the chip discharge grooves (14). Having a body (15, 15),
A drill having a guide groove (6, 6) inclined at the tip end toward the blade body base in a direction opposite to the rotation direction, and a bottom (61) of the guide groove (6, 6). , 61) is a drill characterized by being formed essentially linear. 3. A peripheral surface of the blade body (15, 15) (32, 32) includes a portion formed such that a radius decreases from a rotation direction side to a direction opposite to the rotation direction. The drill according to claim 1, wherein: 4. A thinning surface (10, 10) which is continuous with a chip discharge groove (14, 14) (31, 31) at a tip end of the blade body (15, 15) (32, 32).
The drill according to claim 1, wherein the drill is formed. 5. A base member (2) in which a required number of chip discharge grooves (41, 41) are formed from a base side to a front end side, and a tip provided on a front end of the base member (2). A member (3), and the tip member (3) has a chip discharge groove of the base member (2).
Chip discharge grooves (31, 31) provided continuously with (41, 41),
Blade body provided between chip discharge groove (31) and chip discharge groove (31)
(32, 32), and the leading end of the blade body (32, 32) has a guide groove inclined toward the blade body base in a direction opposite to the rotation direction.
(6, 6) is formed drill, the peripheral surface of the blade body (15, 15) (32, 32) includes a flank formed by a plurality of planes having different angles in the circumferential direction, A drill, characterized in that the drill is formed so that a radius becomes smaller from a rotation direction side in a direction opposite to the rotation direction. 6. A drill comprising: a base member (2) in which a chip discharge groove (41, 41) is formed; and a tip member (3) provided at a tip portion of the base member (2). A drill, wherein the base member (2) and the tip member (3) are provided with a recess in one or both of the bonding surfaces and are brazed. 7. An essentially linear guide groove by cutting the tip of the blade body by linearly moving the rotary grindstone and / or the drill along a linear direction intersecting the axial direction of the drill at a required angle. A method for manufacturing a drill, comprising a step of forming a drill. 8. A method for manufacturing a drill comprising: a base member (2) having chip discharge grooves (41, 41) formed therein; and a tip member (3) provided at a tip end of the base member (2). A method for manufacturing a drill, comprising a step of providing a recess in one or both of the bonding surfaces of the base member (2) and the tip member (3) and brazing.