JPH0457610A - Chamfering cutter - Google Patents

Abstract

PURPOSE:To ensure the easy setting of a chamfering tooth having a cutting edge at the end thereof to a drilling tool, and enable the easy setting of the chamfering tooth even to a tool of different shape simply via partial exchange by causing the chamfering tooth to be engaged with a mounting recess and a drilling tool groove. CONSTITUTION:When drilling and chamfering are undertaken, using a burnishing drill 2 fitted with a chamfering cutter 1, a hole can be smoothly drilled, without hindering the discharge of chips from a drill groove 5. When the burnishing drill 2 is made to advance, the cutting edge 16 of a chamfering tooth 14 comes in contact with the open edge of a hole H and a recess Ha can be formed. Also, the chamfering tooth 14 is properly positioned at the burnishing drill 2, and rotated integrally therewith. The machining of a workpiece W can be machined with the cutting edge 16 of the chamfering tooth 14. The chamfering cutter 1 can be easily set to the burnishing drill 2 for use. Also, the recess HA can be formed at the open edge of the hole H, subsequent to the process of drilling and finishing the internal surface of a drill with the burnishing drill 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for forming a recess having an inner diameter larger than the inner diameter of the hole in the opening edge of a hole formed by a drilling tool such as a burnishing drill, a drill, or a reamer. This relates to a chamfer cutter used for cutting.

[Prior Art] Conventionally, as this type of chamfer cutter, there is one disclosed in, for example, Japanese Utility Model Application Publication No. 2-4180.9. In this chamfering cutter, a main body having a cutting edge and a fixed plate are respectively engaged with two grooves of a drill to sandwich a part of the drill, and these main body and fixed plate are connected with bolts. When this chamfer cutter is used, a recess can be formed at the opening edge of the hole simultaneously with the drilling operation using a drill.

[Problems to be Solved by the Invention] However, when attaching the conventional chamfering cutter to a drill, first the main body and the fixing plate are engaged with the two grooves of the drill, and the holes provided in both are made to face each other. . Then, hold the main body and the fixing plate with both holes facing each other, and screw screws into both holes. Therefore, these installation operations require accurate gripping of the main body and fixing plate, positioning of holes, etc., which is troublesome.

In addition, in conventional chamfering cutters, the main body or the fixed plate has a cutting edge, and the shape of the main body and the fixed plate corresponds to the groove of the drill so that they can engage with the groove of the drill. There is.

Therefore, there is a problem in that the chamfer cutter cannot be attached to another drill of a different shape, and that a number of main bodies and fixing plates must be prepared depending on the type of drill.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to make it easy to attach to a drilling tool, and to easily replace a part of the drilling tool with a different shape. Installation is possible by providing a chamfer cutter.

Means for Solving the Problem] In order to achieve the above object, the present invention is provided with a hole that is attached to a drilling tool and has an inner diameter larger than the inner diameter of both holes on the opening edge of the hole drilled by the double drilling tool. A chamfering cutter for forming a recess, an annular main body that can be externally fitted onto the drilling tool, a fastening means for fastening the main body to the drilling tool, and a mounting recess formed in the main body. and a chamfering cutter comprising a chamfering blade that engages with the groove of the drilling tool and has a cutting edge formed at its tip, and a holding means that holds the chamfering blade in a state where it is engaged with the mounting recess and the groove. The gist is:

[Operation] When attaching a chamfer cutter to a drilling tool, for example, with the chamfering blade engaged in the mounting recess, fit the annular main body onto the drilling tool, and insert the chamfering blade into the groove of the drilling tool. to engage. After the main body is moved to a predetermined position on the drilling tool, the main body is fastened to the drilling tool by the fastening means.

Further, the holding means holds the chamfer blade in a state where it is engaged with the mounting recess and the groove. Then, the main body and the chamfering blade are fixed to the drilling tool.

In addition, in the chamfering cutter of the present invention, since the main body and the cutting blade are separate bodies, the same main body, fastening means, and holding means can be used as common parts, and can be used for drilling tools of different shapes. This can be done by simply replacing the chamfering blade.

[Embodiment 1] An embodiment in which the present invention is embodied in a chamfering cutter attached to a burnishing drill as a drilling tool will be described below with reference to the drawings.

FIG. 2 is a front view of the burnishing drill 2 to which the chamfering cutter 1 is attached, and FIG. 3 is an enlarged sectional view taken along the line m--■ in FIG. The burnishing drill 2 is a reamer that burnishes the inner peripheral surface of the hole at the same time as drilling the hole.
and a shaft body 4. On the outer periphery of the shaft body 4, there is a pair of drills for discharging cutting waste. 1t5 and a plurality (in this case, two pairs) of coolant liquid discharge reamer grooves 6 are formed to extend substantially parallel to each other along the axis.

Figure 1 is an exploded perspective view of the chamfer cutter ■, Figure 4 is the third
This is an enlarged cross-sectional view along the ■-■ line in the figure, and this chamfer cutter ■
The burnishing drill 2 includes a substantially annular body portion 7 that can be fitted onto the shaft body 4 of the burnishing drill 2.

The diameter of the main body portion 7 can be reduced or increased by means of a groove 8 formed along the axis.

Furthermore, assuming that the cutting rotation direction of the burnishing drill 2 is X, a notch 9 is formed in the main body portion 7 in front of the split groove 8 in the cutting rotation direction X.

A support piece 10 sandwiched between the notch 9 and the groove 8
, and in the rear portion of the split groove 8 in the cutting rotation direction X in the main body portion 7, a screw hole 11 extending in the tangential direction is threaded. Therefore, by screwing the bolt 12 into the screw hole 11 to reduce the diameter of the main body 7, it can be tightened to the burnishing drill 2. In this embodiment, these screw holes 11 and bolts 12 constitute a fastening means for fastening the main body 7 to the burnishing drill 2.

On the opposite side of the split groove 8 in the main body part 7, a narrow mounting recess 13 is cut out along the axis;
The upper half of the chamfering blade 14 is engaged with the mounting recess 13.

This chamfering blade 14 is in the shape of a vertically long thin plate, and has a through hole 15 formed in its upper part for inserting a screw 19 described later, and a cutting blade 16 that intersects at a predetermined angle with respect to the axis at its lower edge. ing. When the upper part of the chamfered blade 14 is engaged with the mounting recess 13 of the main body 7 fastened to the burnishing drill 2, the lower side edge of the chamfered blade 14 is engaged with the reamer groove 6 of the burnishing drill 2. (See Figure 2).

As shown in FIG. 4, with the mounting recess 13 as a boundary, a screw insertion hole 18 is provided in the front portion of the main body 7 in the cutting rotation direction X, and a screw hole 17 is provided in the rear portion. Then, the screw 19 inserted into the screw insertion hole 18 is screwed into the through hole 15 of the chamfering blade 14 and the screw hole 17 of the main body part 7.

In this embodiment, these screw insertion holes 18, screw holes 17, and screws 19 constitute a holding means for holding the chamfering blade 14 in a state in which it is engaged with the mounting recess 13 and the reamer groove 6.

When the chamfering cutter 1 configured as described above is attached to the burnishing drill 2, for example, the bolt 12, the chamfering blade 14, and the screw 19 are attached to the main body 7 in advance.

At this time, by loosely tightening the bolts 12 and screws 19, the chamfering blade 14 can be moved slightly, and the diameter of the main body 7 is expanded. Next, with the main body portion 7 expanded in diameter, the angle (orientation) of the chamfer cutter relative to the burnishing drill 2 is adjusted so that the chamfer blade 14 corresponds to the reamer groove 6 of the burnishing drill 2.

Then, the main body 7 is gradually fitted onto the shaft main body 4 of the burnishing drill 2. The work can be done easily. After moving the chamfering cutter 1 to a predetermined position, the bolt 12 is fully tightened. Then, the diameter of the main body 7 is reduced, and the inner peripheral surface of the main body 7 is heated by a burnishing drill. 2. Therefore, by the tightening force of the bolt 12, the chamfering cutter 1 can be fastened to the burnishing drill 2 so as to be unrotatable and immovable in the axial direction.

After tightening the bolt 12, after confirming that the tip of the chamfered blade 14 is engaged with the reamer groove 6 of the burnishing drill 2, the screw 19 is fully tightened. When the screw 19 is tightened, the chamfered blade 14 is engaged with the mounting recess 13 and the reamer groove 6, so rotation in the cutting rotation direction X is not only prevented, but also in the axial direction. Movement to is also restricted.

As described above, according to the present embodiment, unlike the conventional technology, which requires accurate gripping of the main body and fixing plate, positioning of holes, etc., the chamfering cutter 1 can be reliably attached to the burnishing drill 2 with a simple operation. I can do it.

Further, in this embodiment, since the main body 7 and the chamfering blade 14 are separate bodies, the main body 7, bolts 12, screws 19, etc. can be used as common parts.

Further, it is possible to correspond to a drilling tool having a different shape by simply replacing the chamfering blade 14. That is, by simply preparing many types of chamfering blades 14, the present invention can be applied to various types of drilling tools.

By the way, when drilling and chamfering work is performed using the burnishing drill 2 to which the chamfering cutter 1 is attached, the burnishing drill 2 is attached to a chuck (not shown) of a drilling machine or the like, and the burnishing drill 2 is used for cutting. While rotating in the rotational direction X, the tip is brought into contact with a workpiece such as a workpiece.

Then, as shown in FIG. 2, a hole H is drilled in the work W by the burnishing drill 2. At this time, cutting waste is discharged from the drill groove 5 of the burnishing drill 2, but since the chamfered blade 14 is engaged with the beveled groove 6 as described above, this chamfered blade 14 prevents the discharge of cutting waste. It does not get in the way, and the drilling work with the burnishing drill 2 can be performed smoothly.

When the burnishing drill 2 is further advanced, the cutting edge 16 of the chamfer blade 14 of the chamfer cutter 1 comes into contact with the opening edge of the hole H drilled by the burnishing drill 2. The cutting edge 16 can form an inverted truncated conical recess Ha having an inner diameter larger than the inner diameter of the circumferential hole H at the opening edge of the hole H. At this time, the chamfering blade 14 is reliably positioned with respect to the burnishing drill 2 and is rotated together with the burnishing drill 2, so that the workpiece W can be reliably processed by the cutting edge 16 of the chamfering blade 14.

In this way, the chamfering cutter 1 of this embodiment can be easily attached to the burnishing drill 2 and used, and can be used to create a recess Ha on the opening edge of the hole H following drilling with the burnishing drill 2 or finishing the inner surface of the hole. can be formed, and a series of processing operations can be performed efficiently.

Note that the present invention is not limited to the configuration of the embodiment described above, and for example, the mounting recess 13, the screw hole 11, and the bolt 12.
Any changes may be made without departing from the spirit of the invention, such as increasing the number of chamfering blades 14 to two or more and attaching a plurality of chamfering blades 14 to the main body 7.

[Effects of the Invention] As detailed above, the chamfering cutter of the present invention is easy to attach to a drilling tool, and can be easily attached to a drilling tool of a different shape by simply replacing the chamfering blade. This has the effect of being able to respond accordingly.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention; FIG. 1 is an exploded perspective view of a chamfering cutter, FIG. 2 is a front view of the chamfering cutter attached to a burnishing drill, and FIG. Figure 4 is an enlarged cross-sectional view taken along the l-111 line of
FIG. 2 is an enlarged sectional view taken along line IV-IV in the figure. 2... Burnishing drill as a drilling tool, 6...
- Reamer groove, 7... Body part, 11... Screw hole forming part of the fastening means, 12... Bolt forming part of the fastening means, 13... Mounting recess, 14... - Chamfering blade, 16... Cutting blade, 17... Screw hole forming part of the holding means, 18... Screw insertion hole forming part of the holding means, 19... Part of the holding means The screws that make up the part, H.
...hole, Ha...concavity. Patent applicant Omi Kogyo Co., Ltd. Agent Patent attorney Hironobu Onda (and 1 other person) 2nd FA 9X Figure 3

Claims (1)

[Claims] 1. Attached to the drilling tool (2), the drilling tool (2)
A chamfering cutter for forming a recess (Ha) with an inner diameter larger than the inner diameter of the hole (H) at the opening edge of the hole (H) drilled by the hole (H), which can be externally fitted onto the drilling tool (2). an annular main body (7); fastening means (11, 12) for fastening the main body (7) to the drilling tool (2); and a mounting recess (13) formed in the main body (7). ) and a chamfered blade (14) that engages with the groove (6) of the drilling tool (2) and has a cutting edge (16) formed at its tip; ) and groove (6)
holding means (17, 18, 19)
) A chamfer cutter characterized by being equipped with.