JPH0241809A - Chamfering brade of rotary type boring tool - Google Patents

Abstract

PURPOSE:To perform boring work by a boring tool simultameously to form a recessed portion of its opening edge by engaging an engaged portion of a chamfering brade with the groove in a boring tool not to cover the opening portion of a chip guiding groove of the boring tool for fixing the same by a fixing means. CONSTITUTION:A body 1, having its tip portion 1a directed toward the tip of a drill 5, has its side 18, side 17 and side 16 engaged with the front side 53a of a reamer groove 53, the outer periphery of a land 54 and the outer periphery of a land 56, respectively. Then, a fixed plate 2 has its side 22 corresponded to a screw hole 41 and a transparently installed hole 42 and engaged with its side 15, and has an engaged face 24 engaged with the rear side 51b of a drill groove 51. When a screw 3 is threaded in to bring the side 15 close to the side face 22 of the fixed plate 2, the side 18 and the engaging face 24 compress the front side 53a of the reamer groove 53 and the rear side 51b of the drill groove 51, respectively, and then the chamfering brade 1a is fixed while the turning of the drill 5 in the turning direction X is controlled.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a recess having an inner diameter larger than the inner diameter of the opening edge of a hole formed by a rotary drilling tool such as a drill, reamer, or burnishing drill. This relates to the chamfering blade of a rotary hole punching L tool used for molding.

[Prior Art] Conventionally, as a cutting tool of this type, there has been, for example, a countersunk screw milling cutter for forming a recess for sinking a countersunk screw in the opening edge of a hole. This milling cutter has a shank on the proximal end, and the shank is used by being engaged with the chuck of a drill press, like the shank of a drill.

For example, when drilling a hole in a workpiece or the like and forming a recess into which a countersunk screw is to be formed using a -base drilling machine,
First, take a drill on a drilling machine, put it on the drill press, and use that drill to make a hole. Subsequently, this drill is removed and the milling cutter is attached. Then, by rotating this milling cutter and bringing it into contact with the opening edge of the drilled hole, a recess into which the countersunk head screw was sunk was formed.

[Problems to be Solved by the Invention] Therefore, in order to make a hole with a drill or the like using a -base drilling machine and to form a recess at the opening edge of the hole with the milling cutter, it is necessary to use a drill and a drill with respect to the drilling machine. There was a problem in that the milling cutter had to be replaced, and the cutting work was interrupted to replace the milling cutter, reducing work efficiency.

For this reason, it has been desired to provide a cutting tool that can form a recess at the opening edge of the hole at the same time as drilling with a drill or the like.

The object of the present invention is to be able to be used by being attached to a rotary drilling tool such as a conventional drill, reamer, or burnishing drill, and to simultaneously drill the opening edge of the hole with these drilling tools. An object of the present invention is to provide a chamfering blade for a rotary drilling tool capable of forming a recess in the hole.Means for Solving the Problems] In order to solve the above problems, the present invention was constructed as follows.

That is, in order to be able to attach to the outer circumference of the drilling tool with the opening of the chip guide groove of the drilling tool open, an engaging portion that engages with the hole of the drilling tool is provided, and The chamfered blade of a rotary drilling tool is provided with a fixing means to restrict the rotation of the tool in the cutting rotation direction.

Also, a main body formed with one side portion that engages with a wall surface of a hole of the hole-drilling tool as an engaging portion, and a fixing plate formed with a side portion that similarly engages with a wall surface of another hole of the hole-drilling tool; A rotary hole puncher comprising a connecting tool as a fixing means for connecting the main body and the fixing plate by engaging with each other, and having a cutting blade formed at the tip of at least one of the main body and [h1 fixed plate]. It was used as a tool blade.

[Operation] Do not cover the opening of the chip guide of the drilling tool.
The engaging portion of the chamfering blade of the present invention is engaged with the hole of the drilling tool. Then, by fixing it with a fixing means, the chamfering blade can be
It can be securely attached to the outer periphery of the drilling tool while being restricted from rotating in the cutting rotation direction of the drilling tool.

When a drilling tool containing this chamfering blade is attached to a drilling machine or the like and rotated, the chamfering blade also rotates together with the drilling tool. Therefore, when the drilling tool advances further after drilling a hole in the workpiece with the drilling tool, the chamfering blade comes into contact with the opening edge of the hole, forming a recess with an inner diameter larger than the inner diameter of the hole. .

Incidentally, since the chamfering blade is attached so as not to cover the opening portion of the chip guide groove of the drilling tool, the chips discharged during the drilling operation can be smoothly discharged.

When the cutting blade is composed of the main body, the fixing plate, and the connecting tool as described above, one side of the main body is engaged with the outer wall of the drilling tool, and the other side of the main body is engaged with the other outer wall of the drilling tool. The main body and the fixing plate are engaged while engaging one side of the fixing plate. When the main body and the fixed plate are connected with the connecting tool in this state, the drilling tool is pinched between the side parts of the main body and the fixed plate. Therefore, the chamfering blade is securely attached to the outer circumference of the drilling tool while its rotation in the cutting rotation direction of the drilling tool is restricted.

[Example] An example embodying the present invention will be described below with reference to FIGS. 1-7.

As shown in Fig. 1, each pair of chamfering blades is
．． It is composed of a fixing plate 2 and a screw 3 as a connecting device between the two, and by their cooperation, it is possible to attach it to a drilling tool (in this embodiment, a burnishing drill 5).

As shown in FIG. 1.3, each main body 1 is made of a member whose longitudinal direction is along the central axis of the burnishing drill 5 to which it is attached. As seen from Figure 2.4,
On the outside thereof, a first side surface 12, a second side surface 13, a third side surface 14 are adjacent to the front side surface 11 in the cutting rotation direction X of the burnishing drill 5, and a fixing plate 2 is adjacent to the third side surface 14. The rear side surface 15 becomes the engagement surface of
A fourth side surface 16, a fifth side surface 7, a sixth side surface 18,
One seventh side surface is formed, and this one seventh side surface is connected to the front side surface 11, so that the main body 1 has nine side surfaces in total.

The fourth to sixth side surfaces 16 to 18 are engagement surfaces with the outer peripheral portion of the burnishing drill 5, and are formed in a concave shape as a whole. The angle between the 411Fj surface] 6 and the fifth side surface 17 is an obtuse angle, and the fifth side surface 1
7 and the sixth side surface 18 are formed to be an acute angle, and the portion surrounded by the 6111111 surface 18, one seventh side surface, and the front side surface 11 extends throughout the longitudinal direction of the main body 1. It is shaped like a spike.

In the side surface, two screw holes 41 are provided at the top and bottom (longitudinal direction) of the main body 1 so as to penetrate from the second side surface 13 to the rear side surface 15 of the main body 1 .

Furthermore, as can be seen from FIG. 1.3.4, a conical inclined surface 10 that converges downward is formed at the tip 1a of each main body 1 when the main body 1 is attached to the burnishing drill 5. has been done. The obliquely curved surface 10 is connected to the leading edge of the front side 11, the first side 12, the second side 13, the third side 14, and the rear side 15, and is connected to the leading edge of the front side 11 that is connected to the obliquely curved surface 1o. A cutting edge 11a is formed.

As can be seen in FIG. 1, the pair of chamfered blades are cut into the burnishing drill 5 so that the heights of both cutting blades 11a are equal.
It can be stored in.

As can be seen from Figure 1.5.6, the fixing plate 2 is made of a thick plate slightly shorter than the length of the main body 1,
Two insertion holes 42 are provided vertically (in the longitudinal direction) so as to penetrate from the rear side surface 21 to the front side surface 22 of the fixing plate 2. These two through holes 42 are provided so as to correspond to the screw holes 41 when the fixing plate 2 is engaged with the rear side surface 15 of the main body 1.

An engagement surface 24 for engaging the fixing plate 2 with the burnishing drill 5 is formed on the front side surface 22 of the fixing plate 2 over the entire longitudinal direction of the fixing plate 2.

In addition, the front side surface 22 is engaged with the main body 1, and
Even when the engagement surface 24 is engaged with the burnishing drill 5,
A gap is formed between the front side surface 22 and the main body 1.

By the way, as can be seen in Fig. 1.2, the burnishing drill 5 to which the chamfering blade described above is attached has a single thread of the drill shaft facing the outer periphery of the cylindrical shaft body connected to the shank (not shown) as a chip guide spring. In addition to providing a total of four glue marks 53 and 55 facing each other in groups of 51 and 2 pieces, a first land 52 is provided between the drill wand 51 and the first reamer 53, and the first reamer 53 and the second reamer A second land 54 is provided between the erasers 55, and a third land 56 is provided between the second reamer eraser 55 and another drill eraser 51. Further, the burnishing drill 5 has a conical top at its tip, and a cutting edge 57 is formed from the top to the tip of the front side surface 51a of the drill spring 51 in the cutting rotation direction X. In addition, the drill clearing 51 and the first reamer 53
And the second reamer well 55 is a linear well.

The above-mentioned main body 1, fixing plate 2 and screw 3 are fitted into the burnishing drill 5 in the following manner.

The main body 1 is arranged so that its tip 1a faces toward the tip of the burnishing drill 5, and the sixth side surface 18 of the main body 1 is engaged with the front surface 53a of the first reamer eraser 53 of the burnishing drill 5 in the cutting rotation direction X. Then, the fifth side M117 of the main body 1 is engaged with the outer circumferential surface of the second land 54, and the fourth side surface 16 of the main body 1 is engaged with the outer circumferential surface of the third land 56.

In this state, the front side 22 of the fixing plate 2 is engaged with the rear side 15 of the main body 1 so that the two screw holes 41 of the main body 1 correspond to the two transparent holes 42 of the fixing plate 2. At the same time, the engaging surface 24 of the fixed plate 2 is engaged with the rear side surface 51b of the drill bit 51 of the burnishing drill 5.

In this way, screw the screw 3 into the rear side 21 of the fixing plate 2.
When screwed into the screw hole 41 of the main body 1 from the side, the rear surface 15 of the main body 1 and the front surface 22 of the fixing route 2 tend to come into close contact with each other.

In addition to this, the sixth side 18 of the main body 1 is the first reamer 5.
3, and the engaging surface 24I of the fixed plate 2: the rear surface 51b of the J drill spring 51 is gradually pressed. The resultant force of the reactions of these two pressing forces can be expressed as a vector directed toward the center of the burnishing drill 5. It is considered that the two pressing forces described above work effectively as a sticking force.

In this way, each chamfering blade can be attached near the outer peripheral surfaces of the second and third lands 5456 of the burnishing drill 5. The chamfering blade is securely fixed to the burnishing drill 5 while being restricted from rotating in the cutting rotation direction X of the burnishing drill 5. Further, even if the chamfering blade is attached to the opening of the drill head 51 of the burnishing drill 5, it remains sufficiently open as before attachment.

Next, the burnishing drill 5 with the chamfering blade attached thereto is engaged with a chuck (not shown) of a drilling machine or the like, and while rotating the burnishing drill 5 in the cutting rotation direction Bring it into contact with something.

Then, as shown in FIG. 7, a hole 1 is drilled in the work W by the burnishing drill 5. At this time, cutting waste is discharged from the drill fi51 of the burnishing drill 5, but
Since the chamfering blade is attached to the burnishing drill 5 as described above, the chamfering blade does not interfere with the discharge of cutting waste, and the drilling work by the burnishing drill 5 can be performed smoothly.

When the burnishing drill 5 is further advanced, the cutting edge 112i of the main body L having double-sided counting blades comes into contact with the opening edge of the hole I drilled by the burnishing drill 5.
1a allows an inverted truncated conical recess Ha having an inner diameter larger than the inner diameter of the hole H to be formed at the opening edge of the hole L. At this time, the double-sided counting blade is reliably positioned relative to the vanishing drill 5 and is reliably rotated together with the vanishing drill 5, so that the workpiece W can be reliably machined by the cutting blade 11a of the main body 1. can.

To remove each chamfering blade from the burnishing drill 5 after drilling is completed, loosen the screw 3 of the chamfering blade and pull it out toward the tip of the burnishing drill 5. Even if the depth of the hole to be cut differs each time, the position where the chamfering blade is placed can be moved up and down (in the direction along the central axis) depending on the depth.

In this way, the cutting blade of this embodiment is similar to the burnishing drill 5.
Easy! In addition to being able to be used by attaching it to the burnishing drill 5, the recess Ha can be formed at the opening edge of the hole I following the drilling or inner surface finishing work of the hole with the burnishing drill 5, and there is no need to replace the tool. A series of processing operations can be performed efficiently.

In this embodiment, a pair of chamfering blades are attached to the burnishing drill 5, but it is also possible to install only one of them.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, as shown in FIG. The side wall 2.5 may be formed in a protruding manner, and the fixed plate 2 as a whole may have a cross-sectional shape, and
Do not pass the screw 3 through this side wall 25, but insert the insertion hole 42 into the FM fixed hole.
Rate 2 Two transparent installations are placed side by side in the longitudinal direction. On the other hand, main body 1
Two screw holes 41 are formed on the third side surface 14 so as to be lined up in the longitudinal direction.

When attaching the main body 1 and fixing plate 2 formed in this way to the burnishing drill 5, first, the sixth engaging the sides 18;
The fifth fi1 surface 17 is engaged with the outer peripheral surface of the second land 54, and the fourth side surface 16 is engaged with the outer peripheral surface of the third land 56.

In this state, the inner surface of the side wall 25 of the fixing plate 2 is connected to the two screw holes 41 provided in the third side surface 14 of the main body 1 and the two transparent holes 42 provided in the side wall 25 of the fixing plate 2. The third side surface 14 of the main body 1 is engaged in a corresponding manner, and the engagement surface 24 of the fixed plate 2 is engaged with the rear side surface 51b of the drill eraser 51 of the burnishing drill 5.

In addition, "-the inner surface of the north wall 25 and the third side surface 14 of the main body 1
Between and after the engagement surface 24 of the fixing plate 2 and the burnishing drill 5 II! There is a gap between the II surfaces 51b even after they are engaged.

In this way, when the screw 3 is screwed into the screw hole 41 of the main body 1 from the outer surface side of the side wall 25 of the fixing plate 2, the third side surface 14 of the main body 1 and the inner surface of the side wall 25 of the fixing plate 2, In addition, the rear side surface 15 of the main body 1 and the front side surface 22 of the fixing plate 2 tend to come into close contact with each other.

Accordingly, the sixth side surface 18 of the main body 1 is attached to the first reamer 53.
In order to gradually and strongly press the front side surface 53a of the drill spring 51 and the engagement surface 24 of the fixed plate 2 to gradually press the rear side surface 51b of the drill spring 51, as in the previous embodiment, the main body 1 and the fixed plate constituting the chamfered blade 2 and the screw 3 are integrally engaged with the burnishing drill 5.

By configuring the chamfered blade in this way, the force with which the screw 3 is pushed when the screw 3 is screwed in is reduced to the fourth side surface of the main body 1.
6 is transmitted to the burnishing drill 5 as a force that presses the third land 56 of the burnishing drill 5. Moreover, since the direction of the force is the direction passing through the center axis of the burnishing drill 5, it is difficult to generate a moment large enough to rotate the burnishing drill 5 attached to a drilling machine or the like.
), with this configuration, even when installing the chamfering blade while the burnishing drill 5 is attached to a drilling machine etc., the burnishing drill 5 does not rotate even if it is not particularly fixed, making the installation work easy. There is an advantage.

Next, regarding the second embodiment embodying the present invention, the ninth to first embodiments will be described.
This will be explained with reference to FIG.

As can be seen from Fig. 9.10, the main body 1 is connected to the central axis [
It consists of a member whose longitudinal direction is 7 directions, and on the outside,
The rear four surfaces 11 in the cutting rotation direction X, the front side surface 15 in the cutting rotation direction
19 are formed, and two screw holes 41 are formed so as to pass through from the nil side surface 15 to the second side surface 13, and neither a diagonal curved surface nor a cutting edge is formed at the longitudinal end of the main body 1. Not yet.

On the other hand, as can be seen from Fig. 9.11.12, the fixing plate 2 is also almost the same as that of the first embodiment, but the length is slightly longer than the length of the main body 1, and the tip of the fixing plate 2 is (Bottom @ in the figure) is provided with a diagonal portion 26, and a cutting edge 27 is formed on the sloped edge of the diagonal portion 26 that connects to the front side surface 21.

To attach the main body 1 and fixing plate 2 having such a configuration to the burnishing drill 5, first attach the rear side 5 of the drill head 51 of the burnishing drill 5, as shown in FIG.
1b with the sixth side surface 18 of the main body 1, and the third land 5
The fifth side surface 17 is engaged with the outer peripheral surface of the second land 54.
The fourth side surface 16 is engaged with the outer circumferential surface of. In this state, the rear side 22 of the fixing plate 2 is connected to the two screw holes 41 provided in the front side 15 of the main body 1, and the fixing plate 2
The two transparent holes 42 provided in the main body 1 are arranged so that they correspond to each other.
At the same time, the engaging surface 24 of the fixed plate 2 is engaged with the front side surface 53a of the first reamer spring 53 of the burnishing drill 5. Incidentally, there are some gaps between the four rear surfaces 22 of the fixing plate 2 and the front side surface 15 of the main body 1 even after they are engaged.

Thereafter, similarly to the first embodiment, the chamfering blade can be attached to the burnishing drill 5 by inserting the screw 3 into the screw hole 41 of the main body 1 from the front side surface 21 side of the fixing plate 2.

By forming the cutting edge 27 on the fixed plate 2 in this way, even if the cutting edge 27 should be damaged, it is only necessary to replace the fixed plate 2, which is a member smaller than the main body 1. It can be said to be particularly economical when it is desired to use an expensive material such as ceramic for a part of the chamfering blade.

In the embodiments so far, only the burnishing drill 5 having a straight drill hole 51 and a reamer hole 53 has been mentioned as a drilling tool, but a drill with a spiral drill hole etc. has been mentioned. However, if the engaging portion of the chamfered blade is formed in accordance with the spiral shape, the chamfered blade can be removed using a drill.

Furthermore, in each of the above embodiments, the main body 1 is a separate member from the fixed plate 2, but for example, the fixed plate 2 is rotatably attached to the main body with a hinge, and the chamfering blade is made into an integral member. Good too.

[Effects of the Invention] Since the chamfering blade of the rotary drilling tool of the present invention is constructed as described above, it exhibits excellent effects as described below.

It can be attached to a conventional rotary drilling tool such as a drill, reamer, or burnishing drill by using the cutout formed thereon.

Even when this chamfering blade is attached to a drilling tool, the chips generated by the cutting operation with the drilling tool do not get in the way of being discharged from the chip guide groove, and the chips can be smoothly discharged.

Following an operation such as drilling with a drilling tool, a recess with an inner diameter larger than the assimilation inner diameter can be formed at the opening edge of the drilled hole.

Depending on the depth of the hole drilled by the drilling tool, the mounting position of the chamfering blade in the central axis direction of the drilling tool can be freely set.

[Brief explanation of the drawing]

1 to 7 show a first embodiment of the chamfering blade of the present invention, FIG. 1 is a front view showing the state installed in a burnishing drill, and FIG. 2 is a sectional view taken along line AA in FIG. 1. , Figure 3 is a front view of the main body of the chamfering blade, Figure 4 is a bottom view, Figure 5 is a front view of the fixing plate of the chamfering blade, Figure 6 is a bottom view, and Figure 7 is a working state. Explanatory drawings, FIG. 8 is a sectional view showing the side-tilt chamfering blade of the first repair example attached to a burnishing drill, FIGS. 9 to 12 show the second embodiment of the present invention, and FIG. A front view showing the state in which it is installed in the burnishing drill, Figure 10 is a sectional view taken along line B-B in Figure 9,
The figure is a front view of the fixing plate of the chamfering blade, and FIG. 12 is a bottom view. DESCRIPTION OF SYMBOLS 1... Main body, 2... Fixing plate, 3... Screw as a fixing means and connecting tool, 5... Burnishing drill as a rotary drilling tool, 11a... Cutting blade of main body,
18...Sixth side surface serving as an engaging portion and side surface portion, 24.
... Engagement surface as an engagement part and side surface, 27... Cutting edge of fixed plate, 51... Drill eraser as chip guide and clearer, 51b... Rear side surface as tear wall surface, 53
...first reamer as a hole, 53a...front side as a wall of the bowl, I...hole, Ha...concavity, X...
... Cutting rotation direction. Patent applicant: Omi Kogyo Co., Ltd. Representative: Patent attorney: Hironobu Onda Figure 1 Figure 8 115I! 1, -24 Figure 2-L Figure 9 t

Claims (1)

[Claims] 1. A hole (H
) is a chamfering blade for forming a recess (Ha) with an inner diameter larger than the inner diameter of the same hole (H) on the opening edge of the hole (H), The grooves (51, 53) of the drilling tool (5) are installed so that it can be attached to the outer periphery of the drilling tool (5) in an open state.
A rotary hole characterized in that it is provided with engaging parts (18, 24) that engage with the drilling tool, and a fixing means (3) for regulating the rotation of the drilling tool in the cutting rotation direction (X). Chamfering blade of drilling tool. 2. A main body (1) formed with one side portion (18) that engages with the wall surfaces (51b, 53a) of the grooves (51, 53) of the drilling tool as an engaging portion, and another groove of the drilling tool as well. (51,
53) one side portion (53) that engages with the wall surface (51b, 53a)
a fixing plate (2) formed with a body (24);
) and a connecting tool (3) as a fixing means for connecting the fixing plate (2) by engaging with each other, and the cutting blade (11a, 27) is connected to the main body (1) and the fixing plate (2). The chamfering blade of a rotary drilling tool according to claim 1, characterized in that the chamfering blade is formed on at least one tip.