JPH06320498A - Drilling tool, and drilling method and drilling device using the tool - Google Patents

Abstract

PURPOSE:To provide a tool by which a hole with a given diameter and processing depth can be formed in a work having elasticity through one action of a drilling work and to provide a drilling method. CONSTITUTION:A drill 3 is movably inserted in a cylindrical pipe 2 provided at its tip with an acute cutting edge 5. The rotated cylindrical pipe 2 is cut in a work A to form an annular groove 37 and the drill 3 is pressed in a part left uncut to form a hole. The depth of the hole is decided by the cutting depth of the drill 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for punching an elastic work such as rubber, a drilling method and a punching device using the tool.

[0002]

2. Description of the Related Art When a soft and elastic workpiece such as rubber is drilled with a normal drill, the diameter of the drilled hole is elastic when the drill pushed into the workpiece is pulled out. Return, the hole diameter is significantly smaller than the drill diameter.

When a blind hole is drilled in an elastic work piece, the bottom wall of the hole is elastically lifted after the drill is pulled out, and a desired working depth cannot be obtained.

As shown in FIG. 4 (b), the phenomenon as described above is such that a normal drill is equipped with a chisel portion 41 having a large cutting resistance at the center of the cutting edge, and the work A is forcedly expanded as shown by the arrow. However, since the amount of elastic deformation of the work piece A increases due to drilling, when the drill is pulled out of the work piece,
This occurs because the elastic deformation of the work returns.
Therefore, as long as only a drill having a chisel portion is used, the above phenomenon occurs and it is impossible to obtain a required drilling diameter and working depth.

The present invention has been made in order to solve the above problems, and reliably forms a required hole diameter and working depth in one-time drilling for a work having elasticity. An object of the present invention is to provide a tool that can be used, a drilling method and a drilling device using the tool.

[0006]

In order to solve the above-mentioned problems, the drilling tool of the present invention moves a cylindrical tube having a sharp cutting edge at its end and an internal hole of the cylindrical tube. It was constructed in combination with a drill that could be inserted.

Further, according to the drilling method of the present invention, while rotating the cylindrical tube of the above tool, the cutting edge at the end thereof is pushed into the workpiece, and then the rotated drill is used to cut the cylindrical tube into the cutting depth. The method is to press the workpiece to the above depth to make a hole.

Further, the drilling device of the present invention comprises: a rotary driving means for rotating the cylindrical tube of the tool and the drill independently or in conjunction with each other, a machining table for fixing a workpiece, and the machining table. The above-mentioned cylindrical tube and the drill are provided with a feeding means capable of moving them toward and away from each other independently.

[0009]

In the above drilling tool, method and device,
First, when the cutting edge of the rotated cylindrical tube is pushed into the work piece, the circular cutting edge with a high rotation speed enters the work piece, so the work piece is cut with almost no elastic deformation.
An annular groove equal to the diameter of the cylindrical tube is formed in the work piece.

Next, when the rotated drill was pushed into the portion left uncut by the above-mentioned cylindrical tube, the portion left uncut was surrounded by the annular groove. The part is torn off and a hole is formed.

In this case, by setting the drilling depth larger than the annular groove depth formed by the cylindrical tube, a hole having a required drilling depth can be accurately formed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show a punching device of an embodiment,
FIG. 3 (a) shows a tool used for the punching device. Here, the tool will be described first.

As shown in FIG. 3A, the tool 1 of the embodiment
Is configured by combining a cylindrical tube 2 and a drill 3 that is movably inserted through an internal hole 4 of the cylindrical tube 2.

The cylindrical tube 2 is made of hard metal such as hardened steel, and a circular cutting edge 5 is formed at the tip thereof. The cutting edge 5 is formed into a sharp and sharp shape by polishing. Further, a long hole-shaped escape window 6 is formed on the peripheral surface of the cylindrical tube 2 above the cutting edge 5, and the work piece that has entered the internal hole 4 is released from the escape window 6 to the outside. There is.

The drill 3 is set to have a diameter slightly smaller than the inner hole 4 of the cylindrical tube 2 and has a diameter which allows the inner hole 4 to be freely inserted, and the total length of the drill 3 is a required depth of cut through the cylindrical tube 2. The length is set so that it can protrude.

As shown in FIGS. 1 and 2, the drill 3 is a drill chuck 1 mounted on a main shaft 10 of a drilling device.
1 is detachably gripped.

The spindle 10 is designed to be lifted and lowered by turning a handle 13 mounted on the side surface of the spindle head 12, and by operating the handle 13, the drill 3 is provided with a working table 14 below the spindle 10. Move toward and away from.

On the other hand, the cylindrical tube 2 of the tool 1 is detachably attached to the tip of a cylindrical sleeve 15 with a screw 16, and the sleeve 15 is fixed on a working table 14 by a support stand 17. And is rotatably supported via a thrust bearing 18 and a bush 19.

A pulley 20 is attached to the center of the sleeve 15, and the pulley 20 is rotatably supported by a bearing base 21 accommodating the thrust bearing 18 via a radial bearing 22.

A belt 24 is stretched between the pulley 20 and a pulley 23 provided at an end portion of the support stand 17, and a rotary shaft 25 extending from the pulley 23 drives a motor for driving the main shaft 10 ( When the main shaft 10 rotates, the rotary shaft 25 rotates in conjunction with the rotation of the main shaft 10, and the rotation is transmitted to the sleeve 15 via the pulleys 20 and 25 to rotate the cylindrical tube 2. Has become.

At the upper end of the sleeve 15, the ring 2
A radial bearing 27 is attached via 6, and a rotary lever 28 is in sliding contact with the radial bearing 27. The rotation lever 28 is provided on the upper end of a support column 29 provided on the support base 17,
The hinge shaft 30 is attached so as to be rotatable in the vertical direction with the fulcrum as a fulcrum. Further, between the ring 26 and the pulley 20, a coil spring 31 for biasing the rotating lever 28 upward is provided.
And the biased turning lever 28 is
The upper limit position is determined by abutting against the stopper 32 provided at 9, and the posture is maintained in the horizontal state as shown in FIG.

Further, as shown in FIG. 1, a push rod 33 connected to the main shaft 10 is engaged with the tip of the rotary lever 28. The pressing rod 33 is attached so as to move up and down integrally with the main shaft 10 and moves up and down in conjunction with the main shaft 10 by operating the handle 13. Further, as shown in FIG. 2, a return lever 34 is provided at the tip of the pressing rod 33.
Is rotatably attached via a pin 35, and its return lever 34 is urged by the elasticity of a winding spring 36 provided on the pin 35 so as to always rotate upward.

In this structure, when the main shaft 10 and the pressing rod 33 are lowered from the state shown by the solid line in FIG. 2, the rotating lever 28 is pushed by the return lever 34 to rotate downward, and the sleeve 1
5 descends with the drill 3. When the rotating lever 28 is rotated to the position (a) shown by the chain line in FIG. 2, the engagement with the return lever 34 is released, and the rotating lever 28 is rotated upward by the elasticity of the coil spring 31. In this case, if the spindle 10 continues to descend, the drill 3 continues to descend, and the sleeve 15
And only the cylindrical tube 2 rises.

The drill 3 descends to the required position and the spindle 10
When is raised, the pressing rod 33 also rises, but the return lever 34 abuts the turning lever 34 during the raising.
In this case, as shown by the chain line in FIG.
It rotates downward, and when it passes the rotation lever 28, it returns to the horizontal state due to the elasticity of the winding spring 36. Therefore, by subsequently operating the handle 13 to lower the main shaft 10, the drill 3 and the cylindrical tube 2 are simultaneously lowered,
After that, only the cylindrical tube 2 can be automatically raised, and the operation can be repeated.

The drilling device of this embodiment has the structure as described above, and a drilling method using the device will be described with reference to FIG.

As shown in FIG. 3 (a), when a workpiece A made of rubber or the like is fixed to the processing table 14 below the tool 1 and the main shaft 10 is rotated in that state, the drill 3 and the cylindrical pipe are 2 rotates together.

From this state, when the main shaft 10 is lowered by operating the handle 13, the drill 3 and the cylindrical tube 2 are simultaneously lowered, and first, as shown in FIG. 3B, the cutting edge 5 of the cylindrical tube 2 is cut. Enters the processed product A.

In this case, the cutting edge 5 of the cylindrical tube 2 has a circular thin width, there is no chisel portion having a large cutting resistance in the center, and the cutting edge 5 as a whole has a high rotation speed, so that it is sharp. Enter the work piece A as if to cut it with a blade.

At this time, during the machining, only a small cutting force is applied from the cylindrical tube 2 to the workpiece A in the axial direction as shown in FIG. It is cut into the workpiece with almost no elastic deformation, and an annular groove 37 having a diameter substantially equal to the diameter of the cylindrical tube 2 is formed in the workpiece.

When the cylindrical tube 2 enters the workpiece to a predetermined depth, the rotary lever 28 is disengaged from the return lever 34 and rises as shown in FIG. 3 (c). The rotated drill 3 is pushed into the work piece left uncut in the tube 2.

In this case, since the periphery of the uncut portion of the work is surrounded by the annular groove 37, the uncut portion is torn off by the rotation and pushing of the drill 3 to form a hole. It

Then, as shown in FIG. 3C, the drill 3 is
After pushing deeper than the cutting position of the cylindrical tube 2 to the required cutting depth, the drill 3 is lifted and returned as shown in FIG. 3 (d) to obtain a hole with a required diameter and working depth. be able to.

During the perforating process, as shown in FIG. 3 (b), the workpiece inside the annular groove 37 may be torn off during cutting of the cylindrical tube 2, but this workpiece is the cylindrical tube 2
Is discharged from the escape window 6 to the outside. Further, the chips generated when the drill 3 is pushed in are smoothly discharged from the gap 38 formed between the cylindrical tube 2 and the workpiece A, as shown in FIG.

In the above embodiment, the cylindrical tube 2 and the drill 3 are rotated by the same motor in conjunction with each other, but they may be independently rotated.

Although an example of raising and lowering the spindle 10 by the manual operation of the handle 13 has been shown, a mechanism for raising and lowering the spindle is mechanized so that the cylindrical tube 2 and the drill 3 can be automatically raised and lowered. Good.

[0036]

[Effect] As described above, according to the present invention, a hole is formed with a drill after a workpiece is cut into an annular shape with a cylindrical tube, so that a hole is formed once for an elastic workpiece. There is an advantage that a hole having an accurate diameter and a processing depth can be formed by drilling, and the efficiency of drilling a workpiece such as rubber or a soft material can be significantly improved.

[Brief description of drawings]

FIG. 1 is a front view showing a punching device according to an embodiment.

FIG. 2 is a partially longitudinal front view showing an enlarged main part of the above.

FIG. 3A is a cross-sectional view showing a drilling tool of an embodiment,
(B) to (d) are cross-sectional views showing the drilling method.

FIG. 4A is a cross-sectional view showing a processed state of a cylindrical tube,
(B) is a cross-sectional view showing a drilled state

[Explanation of symbols]

 1 Tool 2 Cylindrical Pipe 3 Drill 4 Internal Hole 6 Relief Window 10 Main Spindle 14 Processing Table 15 Sleeves 20, 23 Pulley 28 Rotating Lever 33 Push Rod 34 Return Lever A Workpiece

Claims (3)

[Claims] 1. A drilling tool formed by combining a cylindrical tube having a sharp cutting edge formed at its end and a drill movably inserted through an internal hole of the cylindrical tube. 2. The tool according to claim 1, wherein the cylindrical pipe of the tool is rotated, the cutting edge at the end thereof is pushed into the workpiece, and then the rotated drill is deeper than the pushing depth of the cylindrical pipe. It is a drilling method that pushes into the work piece to make a hole. 3. A rotary driving means for rotating the cylindrical tube and the drill of the tool according to claim 1 alone or in conjunction with each other, a working table for fixing a workpiece, and the cylindrical shape with respect to the working table. A drilling device comprising a feed means capable of moving a pipe and a drill independently of each other.