JPH10278006A - Spot facing cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the vibration of a spot facing cutter. SOLUTION: A spot facing cutter 1 is provided with a removable cylindrical section 2 on its tool, and a plurality of arms 3 are protruded radially from the rotating axial line of the cylindrical section 2 on its end outer side. Cutting blades 4 are clamped and fixed by screws 5 on the bottom faces of respective arms 3. Storage recessed sections 8 are formed on the bottom faces of respective arms 3, and screws 10 are provided on respective storage recessed sections 8. Parts of heads 10a of respective screws 10 are protruded from the end faces of respective arms 3. When circular seats are drilled, parts of the heads 10a of the screws 10 are slid while rotating on the inner peripheral faces of the circular seats, and the rotation of respective arms 3 is stabilized and the vibration is hard to generate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterbore cutter.

[0002]

2. Description of the Related Art For example, a circular seat for attaching a head of a bolt or a nut is excavated on wood used for a wooden house by a counterbore cutter. Conventionally, this counterbore cutter has a plurality of arms extending radially from its rotation axis, and each arm is provided with a digging blade. When digging a circular seat, when the digging cutter mounted on the rotating shaft of the tool is driven to rotate, the arm and the digging blade are integrally rotated, and the circular seat is digged and formed on wood.

[0003]

However, in the conventional counterboring cutter, the rotation is difficult to stabilize, and the counterboring cutter may vibrate. When such vibrations occur, workability and safety decrease, and high-precision machining becomes impossible.

Therefore, an object of the present invention is to prevent excavation of a counterbore cutter and excavate with high machining accuracy.

[0005]

According to a first aspect of the present invention, there is provided a digging cutter for digging a circular seat in a material to be digged, comprising a plurality of arms extending radially from the rotation axis and having a digging blade. The gist is that a vibration suppressing portion that slides with respect to the circular seat is projected from the outer peripheral surface of each arm.

According to a second aspect of the present invention, in the first aspect, the vibration suppressing portion is detachable from the arm. The invention according to claim 3 is
In the invention described in claim 2, the gist is that the vibration suppressing portion is constituted by a screw head, and the outer peripheral surface of the head contacts the inner peripheral surface of the circular seat.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the digging cutter 1 includes a tubular portion 2 that is detachable from a drive shaft of a tool 11. (In this embodiment, 3
) Are integrally formed. Each arm 3
An excavating blade 4 is fixed to the bottom surface of the base with screws 5. The cutting edge 4 a of each excavating blade 4 projects obliquely from the bottom surface of the arm 3. In addition, a wood pulling blade 6 is provided on the tip end surface of one arm 3.
Are fixed by screws 7. The cutting edge 6a of the wood pulling blade 6 projects obliquely from the distal end surface of the arm 3.

As shown in FIG. 1, FIG. 2 and FIG. 4, accommodation recesses 8 are formed on the bottom surface of each arm 3, and a female screw portion 9 is formed on the inner back of each accommodation recess 8. I have. A screw 10 as a vibration suppression unit is detachably screwed to each female screw unit 9, and a head 10 a of each screw 10
Has a short columnar shape and is housed in the housing recess 8. Since each screw 10 is tightened in the same direction as the rotation direction of each arm 3, there is no possibility that the screw 10 will be screwed back while the arm 3 is driven. A part of the head 10 a of each screw 10 is slightly protruded from the distal end surface of each arm 3.

Next, the operation of the counterbore cutter 1 configured as described above will be described. As shown in FIG. 5, a guide rod 12 protruding from the tip of the drive shaft of the tool 11 is penetrated through the cylindrical portion 2 of the digging cutter 1 and connected and fixed. In this state, the guide rod 12 is inserted into a hole 14 that has been preliminarily pierced at a predetermined angle into a wood 13 as a material to be excavated. When the drive shaft of the tool 11 is rotated, the respective excavating blades 4 and the wood-pulling blades 6 are driven as the respective arms 3 are driven.
Thereby, the circular seat 15 is excavated and formed on the wood 13. During this excavation, the rotation of each arm 3 is stabilized because a part of the outer peripheral surface of the head 10 a of the screw 10 slides on the inner peripheral surface of the circular seat 15. When the head 10a of the screw 10 is worn by sliding friction with the inner peripheral surface of the circular seat 15, the screw 10
Is screwed out of the female screw portion 9 and removed, and a new screw 10 is screwed into the female screw portion 9.

FIG. 5 shows a case where the circular seat 15 is excavated obliquely with respect to the surface of the wood 13, and FIG.
5 shows a case where the excavation 5 is excavated in a direction perpendicular to the surface of the wood 13. In the case of FIG. 6, the drill 20 is fixed to the cylindrical portion 2.

Next, effects that can be found from this embodiment will be described below. -Since a part of the head 10a of the screw 10 provided on each arm 3 slides on the inner peripheral surface of the circular seat 15, the rotation of each arm 3 can be stabilized. Therefore, the digging cutter 1 does not vibrate when the circular seat 15 is excavated. Therefore, the vibration is not transmitted to the tool,
While improving workability and safety,
High precision excavation becomes possible.

Since each screw 10 is detachable from each arm 3, even if each screw 10 is worn, it can be replaced with a new screw 10. -Since the screws 10 can be easily attached to and detached from each arm 3 in a screwing relationship, the screw 10 can be replaced quickly.

Since the screw 10 slides on the inner peripheral surface of the circular seat 15 and the arm 3 does not contact the inner peripheral surface of the circular seat 15, the wear of the arm 3 is suppressed and the life of the cutter 1 is extended. Can be achieved.

If the screw 10 having a different diameter of the head 10a is selected, the contact pressure against the inner peripheral surface of the circular seat 15 can be changed. Therefore, an optimum contact pressure can be secured according to the type of wood and the like.

The above embodiment may be configured as follows. -Each screw 10 is omitted, and a protruding portion is integrally formed on the distal end surface of each arm 3 instead.

Next, technical ideas other than the claims that can be grasped from the embodiment will be described together with their effects. (A) An accommodating portion (accommodating recess 8) is formed in the arm, and a head (10) of a screw (screw 10) is provided in the accommodating portion.
4. A counterboring cutter according to claim 3, wherein a) is accommodated. According to this configuration, it is possible to prevent rattling due to the rotational force of the screw itself during excavation of the circular seat.

[0017]

The present invention is configured as described above, and has the following effects. According to the first aspect of the present invention, when excavating the circular seat, the vibration suppressing portion slides on the inner peripheral surface of the circular seat. Drilling can be performed with processing accuracy.

According to the second aspect of the present invention, when the vibration suppressing portion is worn, only the vibration suppressing portion needs to be replaced, and it is not necessary to replace the entire counterboring cutter. Therefore, maintenance costs can be reduced.

According to the third aspect of the invention, it is possible to adjust the contact pressure of the vibration suppressing portion against the inner peripheral surface of the circular seat.

[Brief description of the drawings]

FIG. 1 is a perspective view of a counterbore cutter showing one embodiment.

FIG. 2 is a bottom view of a counterbore cutter.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a perspective view showing a use state of the counterbore cutter.

FIG. 6 is a perspective view showing another usage state of the counterbore cutter.

[Explanation of symbols]

3 ... arm, 10 ... screw (vibration suppression part), 13 ... wood (excavated material), 15 ... circular seat

Claims (3)

[Claims] A digging cutter for digging a circular seat in a material to be excavated is provided with a plurality of arms extending radially from a rotation axis thereof and having a digging blade. A counterbore cutter with a protruding vibration suppression part. 2. The counterbore cutter according to claim 1, wherein the vibration suppressing portion is detachable from the arm. 3. The digging cutter according to claim 2, wherein the vibration suppressing portion is constituted by a head portion of the screw, and an outer peripheral surface of the head portion contacts an inner peripheral surface of the circular seat.