JPH09225897A - Angular hole machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To machine an angular hole by little pressing/pushing force, and reduce the abrasion of a blade tip so as to durably use a cutlery. SOLUTION: In a boring machining means equipped with a drill 4, a fixed blade 13 arranged to surround the periphery of the drill 4, and a pushing/ pressing means which pushes, presses and actuates the fixed blade 13 toward a machining member, a ultrasonic oscillator B is attached to the fixed blade 13, and the exciting electric power of a ultrasonic generator C is supplied to this oscillator B. Vibration in a ultrasonic range is applied to the blade tip (a) of the fixed blade 13 so as to execute boring machining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square hole drilling device for punching a fixed blade by vibrating in the ultrasonic range.

[0002]

2. Description of the Related Art A known square hole drilling apparatus is shown in FIG. That is, the conventional processing apparatus includes a drill 30 and a fixed blade 31 that surrounds the outer peripheral portion of the drill 30, and drives the drill 30 to rotate and applies a pressing force in the axial direction to the fixed blade 31 to process a material such as wood. The W is perforated. The tip edge 30a of the fixed blade 30 is formed in a sharply pointed shape only.

[0003]

In such a square hole machining apparatus, since the machining proceeds while the fixed blade 31 shears the workpiece W, the cutting resistance is extremely large and a large pressing force is required. There was a problem that the blade edge was extremely heavy and the sharpness was significantly reduced due to wear. Further, it has been pointed out that there is a problem in that the pulling resistance of the fixed blade is large even after the processing is completed, and therefore a strong clamping means is required to hold the processed material W.

The present invention has been made by paying attention to the above-mentioned problems of the prior art. The required power can be reduced by smoothly and lightly performing the cutting operation, and the wear of the cutting edge can be suppressed to be small. The present invention intends to provide a new square hole drilling device that can be used.

[0005]

In order to achieve the above object, the square hole machining apparatus according to the present invention is configured as follows. That is, the gist thereof is a drill, a fixed blade provided so as to surround the outer periphery of the drill, and a punching means provided with a pressing means for pressing the fixed blade,
An ultrasonic vibration means for exciting at least the fixed blade of the drill and the fixed blade in the ultrasonic range is provided, and the drilling is performed by the fixed blade in the excited state.

[0006]

It has been found that when a vibration in the ultrasonic range is applied to the cutting edge of a fixed blade in the traveling direction of the cutting edge, the cutting resistance of the cutting edge with respect to the work material is significantly reduced, and the punching can be performed with a small pressing force. Further, it is recognized that the blade edge wears little and can be used durable without slowing the sharpness.
It was also confirmed that the pull-out resistance of the fixed blade was significantly reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the square hole machining apparatus according to the present invention will be specifically described below.

In FIG. 1, reference numeral 1 is an elevating base, and the elevating base 1 moves a rail 2 up and down by pressing means (not shown). The pressing means is, for example, a fluid cylinder or an electric motor driven feed screw shaft. Reference numeral 3 is an electric motor mounted downward on the elevating base 1, and 4 is a drill mounted on a motor shaft 6 via a chuck 5.

Reference numeral 7 is a holding cylinder 8 fixed to the lower part of the elevating base 1, 8 is a vertical holder attached to the holding cylinder 7 through a flange 9, and B is an ultrasonic vibrator fixed to the upper end of the holder 8. The child B is the piezoelectric element 10 as an example.
Is composed of a Langevin type ultrasonic transducer having a metal block 11 sandwiched between.

A fitting hole 12 is provided at the lower end of the holder 8, and a fixed blade 13 is attached to the fitting hole 12. The fixed blade 13 projects with the cutting edge a downward, and the drill 4
It is configured to be hollow so as to surround the outer peripheral portion of the. Cutting edge a above
The outer shape of is square. A fastening screw 14 fixes the fixed blade 13 to the holder 8.

Next, C is an acoustic wave oscillator for supplying electric power for excitation to the electrodes of the piezoelectric element 10, which is connected to the electrodes by a cord 15. In the above description, the flange 9 of the holder 8 is set at the vibration node position, and the cutting edge a of the fixed blade 13 is set at the antinode position.

Since the structure of the square hole machining apparatus according to one embodiment is as described above, when the electric motor 3 is driven, the drill 4 rotates at high speed inside the fixed blade 13. When the ultrasonic oscillator C is operated in this state, the excitation power is applied to the ultrasonic transducer B by the code 15 and ultrasonic vibration is generated.

As a result, the fixed blade 13 is excited in the direction of arrow F. Here, the holder 8 is held by the node of vibration, and since the blade edge a of the fixed blade 13 is an antinode of vibration, there is no damping vibration and the fixed blade 13 can be effectively subjected to ultrasonic vibration. This also means that internal stress does not occur in the holder 8 and the fixed blade 13.

When ultrasonic vibration is applied to the cutting edge a as described above, the pressing means (not shown) is operated to operate the drill 4
And the fixed blade 13 is lowered to cut into the processed material. Due to this cut, the drill 4 cuts a round hole and the fixed blade 13 cuts the corners of the four corners, and the square hole processing proceeds.

Since the blade edge a of the fixed blade 13 is vibrated in the ultrasonic region in the traveling direction, the shearing action is smooth and the processing can be performed with a light pressing force. It is considered that this is because the striking force of the cutting edge a effectively acts at high speed to reduce the cutting resistance. Further, this significantly reduces the wear amount of the cutting edge a.

After completion of the square hole processing, ultrasonic vibration is applied to the cutting edge a even when the fixed blade 13 is pulled out. By doing so, the pull-out resistance can be significantly reduced. This means that the clamping force of the processed material can be set small.

The vibration frequency in this embodiment is 10 kHz.
z to 60 kHz is preferable, but practical frequency is 20.5
There were no problems even in the kHz range, and good results were obtained.

Next, FIG. 2 shows an embodiment in which the arrangement of the ultrasonic transducer B is changed. In this embodiment, the fixed blade 1
By arranging 3 and the ultrasonic transducer B at close positions, the overall configuration is simplified. The same or equivalent members as those in the above-described embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

[0019]

As described above, according to the square hole drilling apparatus of the present invention, the cutting resistance can be remarkably reduced, and therefore, it is possible to carry out the drilling with an extremely small pressing force as compared with the prior art. became. In addition, since the amount of wear can be remarkably suppressed by reducing the burden on the blade edge, the blade can be used in a durable manner. Further, since the pull-out resistance is small, it has an excellent effect that the structure of the clamp means can be simplified.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a square hole machining device according to the present invention.

FIG. 2 is likewise an explanatory view showing another embodiment.

FIG. 3 is an explanatory view showing a structure of a conventional square hole machining device.

[Explanation of symbols]

 1 Lifting Base 4 Drill 7 Holding Tube 8 Holder 9 Flange B Ultrasonic Transducer 10 Piezoelectric Element 13 Fixed Blade a Blade Edge C Ultrasonic Oscillator

Claims (1)

[Claims] 1. A drilling means comprising a drill, a fixed blade provided so as to surround the outer periphery of the drill, and a pressing means for pressing the fixed blade, wherein at least the fixed blade of the drill and the fixed blade is ultrasonic wave. A square hole drilling device, characterized in that ultrasonic vibrating means for exciting in a region is provided, and punching is performed by a fixed blade in an excited state.