JP2641694B2 - Drilling tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to remove burrs generated on the front and back surfaces of a steel plate, a copper plate, an aluminum plate or the like when a hole is drilled by a tool or a drill having a dedicated drilling blade. Pertaining to a drilling tool.

[0002]

2. Description of the Related Art For example, a steel plate is drilled using a drill for drilling, and burrs on the front and back surfaces of the steel plate generated at this time exert an appropriate tightening force or frictional force when tightening the steel plate with bolts or rivets. It cannot be obtained, which causes quality problems.

In order to remove such burrs,
Conventionally, a post-process of drilling work using a grinder or other grinding or cutting is required. A considerable amount of labor and time is required for these deburring operations, and in the case of deburring operation by grinding, an increase in work load due to the reversal operation of a steel plate or the like, generation of dust, generation of noise, and the like become problems.

[0004] Instead of the method of performing the deburring process after such a drilling operation, a tool capable of performing the deburring at the same time as the drilling has already been used.

For example, Japanese Utility Model Laid-Open Publication No. 56-33114 discloses that a drilling tool is divided into a front connecting member having an axial drilling blade and a rear mounting base provided with an elastic body. A tool connected by a horizontal axis pin is disclosed. This tool is provided with a contact portion formed at the distal end of the connected body, a hanging member protruding near the contact portion, and a drilling blade at the distal end thereof. A concave portion is formed at a boundary portion, and a cutting blade is formed at a front oblique edge portion of the concave portion. Then, as the drilling operation progresses, the abutting portion abuts on the drilling surface of the workpiece, whereby the coupling body is turned around the horizontal shaft pin against the elastic body so that the concave portion only enters the peripheral edge of the drilled hole. By rotating, the burrs on the back side of the drilled hole can be cut off by the cutting blade.

On the other hand, by chamfering a perforated surface of a workpiece to remove burrs on the front side thereof, Japanese Utility Model Laid-Open No.
There is one described in JP 1123623.

In this method, a chamfering blade is fixed to a slidably fitted chamfering blade base which can be fixed by screwing a fixing screw in contact with a bottom surface of a dovetail groove provided in an axial direction of a shaft of a drilling tool. Things
The configuration is such that chamfering is possible subsequent to drilling with a drilling tool.

Japanese Patent Application Publication No. 1-37853 discloses a method for removing front and back burrs of a workpiece.

[0009] This is one in which a deburring tool main body containing a deburring tip pressed by a spring is mounted in a deburring tool mounting hole formed perpendicular to the axis of the drilling tool.
The deburring tip protruding outward from the outer diameter of the drilling tool rolls the burr at the open end of the drilling hole, and when the deburring tool enters the drilling hole, it deburrs against the spring. The chip is immersed, and the burrs are removed following the drilling operation by the drilling tool.

[0010] In addition to the technique described in Japanese Utility Model Publication No. 1-37853, there is a technique described in Japanese Utility Model Publication No. 1-37854 that performs chamfering of a perforated surface.

The tip of the deburring tip, which is pushed by a spring toward the shaft of the drilling tool from a lateral hole provided on the shaft of the drilling tool, has a spherical shape, and has an arcuate arc of a cross section. Subsequently, a cutting blade having a width equal to or greater than the width of the chamfered surface of the hole and having a surface angle of the chamfered surface is provided, so that deburring and chamfering can be performed following boring with a boring tool.

[0012]

[Problems to be solved by the invention]
According to the technique described in Japanese Patent No. 33114, it is not possible to remove the surface burr of the drilled hole of the workpiece. Also, as for the back surface burrs, since the cutting blade acts by the concave portion being inserted only into the periphery of the drilled hole, it is difficult to remove the burrs when there is a thickness or a surface burr of the workpiece. . Further, since the verticality of the drilling blade during the drilling operation is maintained by the elastic body, it is difficult to determine the elastic force in consideration of the turning property of the connecting body.

Further, according to the technique described in Japanese Utility Model Laid-Open No. 61-12623, it is possible to remove burrs on the surface of the drilled hole and to perform chamfering. However, since the chamfering blade protrudes from the side of the shaft, it cannot enter the drilled hole and the back burr cannot be removed, and the position of the chamfering blade is set according to the thickness of the workpiece. It needs to be fixed and takes time.

According to the techniques described in Japanese Utility Model Publication No. 1-37853 and Japanese Utility Model Publication No. 1-37854, it is possible to remove the burrs on the front and back surfaces of the drilled holes. However, since the deburring tool body is attached to the mounting hole provided on the shaft of the drilling tool, and since the deburring tool enters the machining hole, the deburring tool is inserted into the drilling tool by means such as shrink fitting. Must be fixed. As a result, the tool manufacturing process becomes complicated, and the deburring tip is closed by a stopper fitted to the rear end of the deburring tool body via a spring. Not. Furthermore, since the deburring tip protrudes outward from the drilling tool, its mounting position is an intermediate portion separated from the tip of the drilling blade of the shaft of the drilling tool,
It is necessary to advance the drilling tool a certain distance after the drilling operation, which affects the working efficiency.

The problem to be solved in the present invention is to remove burrs on both front and back surfaces of a steel plate or the like with a simple structure, and to enable removal and chamfering at a drilling distance that is almost the same as ordinary drilling. It is in.

[0016]

According to the present invention, there is provided a body provided with a cutting blade for making a hole , and a groove is formed on the peripheral surface of the leading end portion by opening the leading end surface substantially parallel to the axis of the body. Inside
A connecting member is provided with the base end side constrained to the body and the distal end side as a free end, and a distal end of the connecting member is provided from the peripheral surface of the body.
A part thereof protrudes, and from the peripheral surface of the body due to elastic deformation of the connecting member in the radial direction of the body.
An auxiliary blade for deburring that can be immersed in the groove , wherein the auxiliary blade is close to a cutting edge of the cutting blade for drilling.
It is characterized by being located beside .

In addition, a structure may be provided with a spring for urging the elastically deforming connecting member outward, or a structure may be employed in which the connecting member is formed as a rigid body and is urged to the outside of the body by a spring. Good.

[0018] The auxiliary blade has a shape in which at least a portion protruding outside from the groove is substantially arc-shaped when viewed in a direction perpendicular to the axial direction of the body, and the connecting member is a rod using a bar-shaped spring steel or the like. It may be.

Further, an oil hole for supplying cutting oil to the cutting surface by the cutting blade and the auxiliary cutting tool can be provided inside the body.

Further, a plurality of auxiliary blades may be provided on the outer periphery of the body.

[0021]

[Function] Since one end of the connecting member is a free end on which the auxiliary blade is mounted, if the auxiliary blade is made to protrude from the outer peripheral surface of the body when no load is applied to the connecting member, a hole is formed. The auxiliary knives can be removed by hitting surface burrs generated at the initial stage of drilling by the blade. As the drilling proceeds, the auxiliary blade is pushed toward the center of the body by the inner wall of the hole and fits in the groove, and the drilling operation is performed without causing interference with the inner peripheral wall of the hole. Then, when the auxiliary blade comes out of the hole when the hole is made to penetrate, the connecting member is restored to a posture in which the auxiliary blade comes outside the peripheral surface of the body, and the burr on the rear surface side is removed in the same manner.

If the groove is provided with a spring for urging the connecting member outward, the restoring force of the connecting member is increased, the force of the auxiliary blade acting on the burr is increased, and the burr is quickly removed.

If the portion where the auxiliary blade protrudes from the groove is formed in an arcuate outer shape, it is efficiently removed while contacting the burr at the opening edge of the hole at an acute angle. While the opening edge is chamfered, the contact angle between the connecting member and the upper surface of the steel plate gradually increases due to the inward bending of the connecting member, so that the connecting member can smoothly enter the inner surface of the perforation.

Further, by providing an oil hole in the body and supplying cutting oil, it is possible to cool the auxiliary blade and quickly drill a hole, and by providing a plurality of auxiliary blades, it is possible to remove deburring after penetrating the hole. Burrs with a reduced body rotation time can be removed, and the processing time can be reduced.

[0025]

FIG. 1 is a view showing an embodiment of a drilling tool according to the present invention. FIG. 1 (a) is a cutaway front view of a main part, and FIG. 1 (b) is a bottom view.

In the figure, two piercing blades 2 of brazing or throw-away type are mounted on the tip of a body 1 having a shank connected to a rotating main shaft of a cutting machine or the like formed on the base end side. These drilling blades 2 occupy a part of the circumferential direction of the body 1 and are fixed, and are cut in the outer peripheral surface at a position where they do not interfere with the cutting edge of the drilling blade 2 from the lower end in parallel with the axis of the body 1. A groove 1a is provided. And this groove 1a
There is an auxiliary burring tool 3 for removing burrs
Incorporate.

FIG. 2 is an exploded perspective view showing a structure for connecting the auxiliary blade 3 to the body 1. As shown in FIG.

The auxiliary cutting tool 3 is made of a metal connecting member 4 (hereinafter, referred to as a connecting member).
It is integrally joined to a fixed seat 4a provided at one end of the "base 4"), and has an inclined surface with its lower surface inclined upward and its upper surface inclined downward as shown in FIG. The plate-shaped arm portion 4b is extended from the fixed seat 4a of the base 4 so as to be elastically deformable, and when the drilling blade 2 is of a brazing type, it is gradually shortened by being polished and re-formed when worn. A long screw hole 4c is opened at one end of the auxiliary blade 3 so that the position of the auxiliary blade 3 can be adjusted accordingly. Also, two shims 5 sandwiching both sides of the arm portion 4b corresponding to the screw long hole 4c portion.
a, 5b are provided, and the base 4 is connected to the body 1 by screws 6 passing therethrough.

In the case where the drilling blade 2 is of a throw-away type, if it is worn out, it is discarded. Therefore, a simple circular hole may be used instead of the long screw hole 4c.

Returning to FIG. 1, the base 4 is incorporated into the groove 1a, and takes a posture having a gap between the base 4 and the bottom wall of the groove 1a equal to the thickness of the shim 5b. The level of the tip side of the auxiliary blade 3 is slightly behind the cutting edge of the drilling blade 2,
Further, a part of the auxiliary blade 3 protrudes from the outer peripheral surface of the body 1.

FIG. 3 is a diagram showing a state from the initial stage to the halfway point when a hole is made in the steel plate 50.

By the advance of the body 1 whose axis is held perpendicular to the steel plate 50, as shown in FIG. Is performed. At this stage, burrs 50a are generated as shown in the figure, but when the auxiliary blade 3 slightly behind the cutting surface (blade tip surface) of the drilling blade 2 hits the burr 50a, the back force generated on the auxiliary blade 3 is generated. And arm part 4
Cutting is performed while the equilibrium state with the elastic force b is displaced.

FIG. 3B shows a state in which all the burrs 50a on the front side are removed and the drilling proceeds.
The burrs 50a are removed while abutting against the edge between the hole 51 to be opened and the surface, and the periphery of the edge is chamfered.

FIG. 3C shows a state in which the body 1 has further advanced in the hole-punching direction. As the body 1 advances, the auxiliary blade 3 has the elastic force of the arm 4b added to the back force required to cut the steel plate 50. The arm 4b is bent inwardly of the body 1 because the arm 4b is no longer crushed, whereby the protruding portion of the auxiliary blade 3 is pushed into the groove 1a. At this time, the arm 4 of the base 4
b is elastically deformed in an arcuate shape as shown in FIG.
It is possible to move to one side.

FIG. 4 is a view showing a state immediately after the hole 51 has penetrated.

[0036] As shown in FIG.
0 immediately after passing through the steel plate 50, the burr 50b
At this stage, the auxiliary blade 3 is still in the hole 51. When the body 1 advances and the tip of the auxiliary blade 3 passes through the lower edge of the hole 51,
Due to the inclination of the upper surface of the auxiliary blade 3 and the restoration of the arm portion 4b, the auxiliary blade 3 jumps out of the hole 51 as shown in FIG. Thus, the auxiliary blade 3 removes the tip of the burr 50b on the back surface side. And this burr 50
When the b is removed, the arm 4b receives the cutting reaction force (back force) received from the burr 50b, and the restoring force (state in which the elastic force of the arm portion 4b exceeds the back force) moves the auxiliary blade 3 to the burr 50b. You can guess.

When the body 1 is lifted after the drilling is completed, the auxiliary blade 3 again enters the hole 51 and rises while removing the base of the burr 50b as shown in FIG. 4B. When exiting the hole 51, the auxiliary blade 3 returns to the original posture of FIG. For this reason, the auxiliary cutting tool 3 moves while following from the rear surface side to the front surface side of the steel plate 50, so that the surface where the burrs 50a and 50b are generated can be cut again, and the refined chamfering becomes possible.

FIG. 5 is an exploded perspective view showing another connecting structure of the auxiliary cutting tool 3 to the body 1.

In this example, a leaf spring 7 is incorporated to reinforce the elastic recovery of the arm 4b of the base 4.
The leaf spring 7 is fixed between the shim 5b and the arm portion 4b by fixing a screw long hole 7a for passing the screw 6 at one end thereof, and the other end side is closer to the auxiliary blade 3 on the back side of the arm portion 4b. It has a shape that is bent in a bow shape so as to hit the part.

By providing such a leaf spring 7, the arm portion 4b can obtain the elastic biasing force of the leaf spring 7 in addition to its own elasticity. The removal force (main component force) at the time of removing the burrs 50a and 50b on both sides can be adjusted to be higher or lower, and good burrs can be removed.

FIG. 6 is an exploded perspective view showing another example of the structure of the elastic means for urging the base 4 outward.

FIG. 7A shows an example in which a coil spring 8 is provided in place of the leaf spring 7 shown in FIG. The coil spring 8 is dropped into the groove 1a of the body 1 and
The two ends are held by a concave hole provided in the bottom wall 1a-1 of the base member a and a concave hole provided inside the fixed seat 4a of the base 4 facing the concave hole or a convex portion provided on the back surface side. .

FIG. 4B shows a disc spring 9 used in place of the coil spring 8, and the bottom of the groove 1a and the fixing seat 4a of the base 4 are formed similarly to the case of FIG. The mandrel 91 is fixedly provided on the fixed seat 4a side, and the other end of the mandrel 91 can be freely fitted into a retreat hole 92 provided at the center of the bottom of the groove of the groove 1a. .

Even when the coil spring 8 and the disc spring 9 are incorporated, the base 4 can obtain the elastic biasing force of the coil spring 8 and the disc spring 9 in addition to the elasticity of the base 4 itself.

FIG. 7 shows another example of the structure of the base.

The base 10 in this example is a mounting seat 10a for a body 1 having a thicker base end, instead of the flat base 4, and a fixed seat 1 on which the auxiliary blade 3 is mounted.
0b between the arm portion 10 and the arm portion 10
c. The base 10 is dropped into the groove 1a of the body 1 as shown in FIG.
It is fixed to the body 1 by two screws 11a and 11b penetrating through 0a.

By appropriately setting the thickness of the arm portion 10c between the mounting seat 10a and the fixed seat 10b, this portion is elastically deformed, and the burrs 50a, 50b at the time of forming the hole 51 are formed as in the previous example. It is possible to take. Further, a coil spring 12 may be incorporated as shown in FIG. 6A to reinforce the elastic deformation of the arm portion 10c.

FIGS. 8 and 9 show another example of the shape of the auxiliary blade and the mounting structure for the body 1. FIG.

FIG. 8 is a view showing the auxiliary blade 13 and the rod 14 connected thereto.

The auxiliary blade 13 has a disk shape different from the triangular tip, and the rod 14 has a mounting seat 14a.
And the tip is screwed in the radial direction of the auxiliary blade 13 to be integrated. It is assumed that the auxiliary blade 13 is manufactured as, for example, a throw-away type chip in which the entire peripheral surface and both surfaces in the axial direction connected thereto can be applied as a cutting surface. The rod 14 is made of a material that is elastically deformable and has little fatigue, such as a rod spring, and preferably has an outer diameter as small as possible. The screw hole 1 is provided in the mounting seat 14a.
4b is opened, and screws are inserted into the screw holes 14b and fixed to the body 1, for example, as in the example shown in FIG.

The auxiliary blade 3 and the rod 14 may be brazed.

FIG. 9 is a cutaway view showing a structure for assembling into the body 1 when the fixed seat 14a is not provided on the rod 14.

A mounting hole 141 into which the base end of the rod 14 is inserted is formed in the groove 1a of the body 1 so that its axis is in a plane including the axis of the body 1 and the respective axes intersect at the base end of the body 1. To be provided. A screw hole 14 intersecting or orthogonal to the mounting hole 141 is formed on the peripheral surface of the body 1.
2 is formed in the radial direction of the body 1, and the rod 14 is restrained and fixed by a screw 143 screwed into the screw hole 142. In such mounting of the rod 14 to the body 1,
As shown in the drawing, approximately half of the peripheral surface of the auxiliary blade 13 is made to protrude outside the groove 1a of the body 1, so that deburring by the auxiliary blade 13 is enabled.

The auxiliary blade 13 is, as shown in FIG.
Projecting outward from the peripheral surface. Then, as shown in FIGS. 3 and 4, when the hole 51 is formed in the steel plate 50, the burrs 50 a and 50 b are similarly removed by the auxiliary blade 13.

At this time, since the auxiliary blade 13 has a disk shape, the triangular auxiliary blade 3
The movement when going out is slower than that of. That is, the auxiliary blade 13 when it passes through the hole 51 moves outward due to the restoration of the rod 14 while its peripheral surface hits the opening edge of the hole 51. The peripheral surface of the auxiliary blade 13 is arc-shaped, and a hole 51 is formed on the axis side from a point farthest from the center thereof.
Since the contact point with the opening edge moves, the outward movement becomes slower than the triangular auxiliary blade 3. Also, at the start of drilling and at the time of retreat of the body 1 after penetrating, similarly, the movement of the auxiliary blade 13 toward the groove 1a is gently performed.

As described above, by making the auxiliary blade 13 into a disk shape, the contact angle between the auxiliary blade 13 and the upper surface of the steel plate 50 can be gradually increased, and the rod between the start of drilling and the completion of the drilling can be obtained. The abrupt outward or inward movement of 14 can be eliminated. Therefore, burrs 50a, 5
When cutting 0b, the load on the body 1 side does not fluctuate abruptly, and more excellent drilling can be performed.

FIG. 10 shows how the auxiliary cutting tool based on the rigid body is incorporated into the body.

The base 60 in this example is a rigid body in place of the elastically deformable bases 4 and 10.
The base 60 is pivotally supported by a pin 62 inserted from the outside of the groove 1a into a pin hole 61 formed in a direction intersecting with the axis of the body 1 passing through the base end side of the base 60 and both side walls of the groove 1a at the corresponding position. The coil spring 12 urges the rear of the fixed seat 60b, on which the auxiliary blade 3 is mounted, so as to swing outward around the pin 62.
Further, on the base end side with respect to the pin 62, the amount of the auxiliary blade 3 protruding from the outer periphery of the body 1 is regulated and an upward force (reaction force of the feed component force) acting on the auxiliary blade 3 at the time of deburring is prevented. An adjustment screw 63 for identifying the position is screwed into a screw hole 64 provided at the bottom of the groove 1a.

Even with such a rigid base 60, the body 1 is rotatably supported by the pin 62 and the auxiliary blade 3 is elastically supported by the coil spring 12 in the direction protruding from the groove 1a. Therefore, the burr 50a,
50b is possible.

In FIG. 10, when the adjusting screw 63 is moved outward, the base end of the base 60 is lifted and the auxiliary blade 3 is dropped into the groove 1a side by the swing thereof to reduce the amount of protrusion from the body 1. Adjustment screw 6
By moving the auxiliary blade 3 toward the center, the amount of protrusion of the auxiliary blade 3 is increased by the urging force of the coil spring 12 until the fixed seat 60 b side is pushed up until the base end of the base 60 contacts the adjustment screw 63. In this manner, the amount of protrusion of the auxiliary blade 3 can be easily set, so that if the auxiliary blade 3 can be regenerated, the protrusion is increased even if the blade is worn, so that deburring can be continued. Becomes possible.

Note that, instead of the coil spring 12, a spring that urges the body 1 toward the outside may be used. Further, the drill for attaching the base 60 may be one having the throw-away type drilling blade 2.

In the above embodiment, one body 1
Each of the auxiliary blades 3 and 13 is mounted on the body 1, but two or more auxiliary blades 3 and 13 may be provided at intervals around the body 1. Also in this case, the structure for attaching these auxiliary blades 3 and 14 to the groove 1a of the body 1 can be exactly the same as that described in the previous example. In the above description, a drill having one or two brazing or indexable cutting blades has been described, but the present invention can also be applied to a gun drill, a straight blade drill, or the like.

FIG. 11 is a longitudinal sectional view of an essential part showing an example applied to a drill having a brazing blade, and FIG. 12 is a bottom view thereof.

The illustrated example is a solid drill, in which a land 15b of a body 15 integrally formed with a shank 15a is formed with a groove 15c parallel to the axial direction. A base 16 similar to that shown in FIG. 7 is incorporated into the groove 15c, and is mounted on the body 15 by screws 17a and 17b via a washer 16d.

The base 16 has a mounting seat 16a for inserting the screw 17a and a fixing seat 16b for mounting the auxiliary blade 18, and a thin elastically deformable arm portion 16 is provided therebetween.
c.

An oil hole 19a for supplying cutting oil is provided in the body 15 in the axial direction. This oil hole 19a is a first branch oil hole 19b opening toward the tip of the land 15b.
And the second branch oil hole 19c opening toward the groove 15c side
And oil passages branched from each other.

Also in this example, the holes 51 as shown in FIGS.
The burrs 50a and 50b can be removed by the movement of the auxiliary blade 18 into and out of the hole 51 and the movement in the axial direction due to the elastic deformation of 6c.

During drilling, the cutting surface on the land 15b side is lubricated by the cutting oil from the first branch oil hole 19b,
The auxiliary blade 18 is cut by the cutting oil from the second branch oil hole 19c.
The lubricated surface is cut. Therefore, by supplying the cutting oil from the first and second branch oil holes 19b and 19c, the entire cutting surface by the drill itself and the auxiliary cutting tool 18 is cooled.

By supplying the cutting oil, the bite when the auxiliary blade 18 moves along the inner peripheral surface of the hole 51 can be suppressed, and the cutting edge can be quickly moved without damaging the cutting surface by the drill. Also, in removing the burrs 50a and 50b in FIGS. 3 and 4, smooth cutting can be performed by cooling with the cutting oil. Needless to say, the present invention can be similarly applied to a drill having a throw-away type cutting edge.

[0070]

The present invention has a simple structure in which a groove parallel to the axial direction of the lower end peripheral surface of the body is formed and an auxiliary blade for removing burrs protrudes and protrudes from the groove. A knife can be installed. For this reason, in addition to being able to remove both the front burr at the start of drilling and the back burr after the penetration, the edge of the perforation can be chamfered, and in particular, the stroke for advancing the body after the penetration to remove the back burr is short. Therefore, the work efficiency can be remarkably improved because it is sufficient to perform the same work as the perforation distance in the normal perforation work. Further, since the auxiliary blade can be easily attached and detached from the outer periphery of the body, the position can be easily adjusted even when the brazing-type drilling blade is regenerated. Furthermore, by having a groove parallel to the axis of the body,
The feed force, the back force and the like acting on the auxiliary blade can be received without difficulty on the basis of the base, so that deburring and chamfering can be performed smoothly.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of a drilling tool according to the present invention, wherein FIG. 1 (a) is a cutaway front view of a main part, and FIG. 1 (b) is a bottom view thereof.

FIG. 2 is an exploded perspective view of a base for attaching an auxiliary blade to a body and other connecting members.

FIG. 3 is a longitudinal sectional view of a main part, showing an initial step of drilling holes in a steel sheet in order.

FIG. 4 is a longitudinal sectional view of a main part showing a process after a hole is made to penetrate a steel plate in order.

FIG. 5 is an exploded perspective view showing an example of a connection structure of a base to which a leaf spring is added.

6A and 6B show another example of the connecting structure of the base to the body shown in FIG. 5, wherein FIG. 6A is an exploded perspective view using a coil spring instead of a leaf spring, and FIG. It is an exploded perspective view using a disc spring.

FIGS. 7A and 7B are diagrams showing another example of the structure of the base, in which FIG. 7A is a schematic perspective view, and FIG. 7B is a cutaway view of a main part when assembled into a body. An example in which a coil spring is mounted is shown.

8 (a) is a front view showing an example using a disk-shaped auxiliary blade together with a rod for connection to a body, FIG.
FIG. 2B is a side view thereof.

FIG. 9 is a cutaway view when an auxiliary blade and a rod are incorporated in a body when no mounting seat is used.

FIG. 10 is a view showing a state in which an auxiliary blade based on a rigid body is incorporated into a body.

FIG. 11 is a longitudinal sectional view of a main part showing an example in which a drill is provided with a cutting oil supply path.

FIG. 12 is a bottom view of FIG. 11;

[Explanation of symbols]

1 Body 10 Base 1a Groove 12 Coil Spring 2 Drilling Blade 13 Auxiliary Blade 3 Auxiliary Blade 14 Rod 4 Base 15 Body 4a Fixed Seat 15c Groove 4b Arm 16 Base 5a Shim 18 Auxiliary Blade 5b Shim 19a Oil Hole 6 Screw 19b First Branch Oil hole 7 Leaf spring 19c Second branch oil hole 8 Coil spring 50 Steel plate 9 Belleville spring 50a Burr 50b Burr 60 Base 62 Pin 63 Adjustment screw

Claims (6)

(57) [Claims] 1. A open substantially parallel to the tip surface and the axis of the body on the peripheral surface of the distal end portion of the body having a cutting edge for piercing
And increments the groove, the base end side inside the groove is provided a connecting member which is a free end to the distal end side constrained to the body, the tip of the connecting member, partially projecting from the peripheral surface of said body Then
In, an auxiliary tool for <br/> deburring which enables retracted into said groove from the peripheral surface of the body by the elastic deformation of the connecting member in the radial direction of the body, wherein the auxiliary blade is a hole open
A drilling tool located near the cutting edge of a cutting blade . Wherein opening substantially parallel to the tip surface and the axis of the body on the peripheral surface of the distal end portion of the body having a cutting edge for piercing
And increments the groove, the base end side inside the groove is provided a connecting member which is a free end to the distal end side constrained to the body, the tip of the connecting member, partially projecting from the peripheral surface of said body Then
In, an auxiliary tool for <br/> deburring which enables retracted into said groove from the peripheral surface of the body by the elastic deformation of the connecting member in the radial direction of the body, wherein the auxiliary blade is a hole open
Perforating tool located in the vicinity of the facets, ing provided with a spring for urging further towards the connecting member on the outside of the cutting edge for only. Wherein opening substantially parallel to the tip surface and the axis of the body on the peripheral surface of the distal end portion of the body having a cutting edge for piercing
A groove is formed, and a connecting member having a base end side rotatably supported on the body and a distal end side as a free end is provided inside the groove, and the connecting member is provided outside at a distal end of the connecting member. Burge toward
A part of the body protrudes from the peripheral surface of the body , and
An auxiliary tool for deburring which enables retracted into said groove from the peripheral surface of said body, said auxiliary blade is for opening said hole
Perforating tool ing located in the vicinity of the facets of the cutting edge. 4. The auxiliary cutting tool has at least a portion protruding outside from the groove in a substantially arc shape as viewed in a direction perpendicular to an axial direction of the body, and uses a bar-shaped spring steel as the connecting member. 4. A rod as claimed in claim 1,
Drilling tool according to any one of the. 5. A drilling tool according to any of claims 1-3 comprising providing a supply oil hole cutting oil to the cutting surface by the cutting blade and the auxiliary blade inside the body. 6. drilling engineering according to any one of 3 the auxiliary blade claim 1 comprising a plurality on an outer periphery of the body
Utensils .