JPH09174318A - Boring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently bore a hole in a stainless plate or the like by reducing abrasion of a tooth of a cutting apparatus without damaging a material by discoloration by heat. SOLUTION: A hole saw 10 is installed on the tip of a spline shaft 12a on one end, and a main spindle 12 whose other end is formed as a bolt shaft 12b is provided, and sprockets 23 and 24 are juxtaposed on a cylindrical sleeve 19 to which the spline shaft 12a is slidably fitted. A nut 37 which moves the main spindle 12 in the shaft direction when the main spindle 12 rotates and receives transmission force of a sprocket 28, is arranged on the bolt shaft 12b of the main spindle 12. A driving part 25 is arranged to rotate the sprocket 23, and a chain 27 is suspended by the sprockets 23 and 26, and a chain 35 is suspended by the sprockets 24 and 33, and a chain 36 is suspended by the sprockets 28 and 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device such as a drill or a hole saw for making a hole in metal or concrete.

[0002]

2. Description of the Related Art Conventionally, a drill or a hole saw is used to make a hole in metal or concrete. However, depending on the material such as metal or concrete,
Ordinary drills and hole saws may damage metal or concrete when making holes.

For example, when a stainless steel plate is punched with a hole saw, the number of revolutions of these holes is relatively large, and the teeth of the hole saw and the stainless steel plate surface make sliding contact with each other. The cutting part may be discolored by heat. In addition, the teeth of the hole saw are rapidly worn, it is necessary to replace the hole saw frequently, and the cost for cutting the stainless steel plate is also high.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is useful for making holes in a stainless steel plate.
An object of the present invention is to provide a punching device that reduces wear of teeth of a cutting tool without damaging the material by heat discoloration.

[0005]

[Means for Solving the Problems] The above object is a cylindrical shape in which a cutting tool is attached to the tip of a spline shaft at one end, and a main shaft having a screw shaft at the other end is slidably fitted to the main shaft. The spline bearing, the drive unit that rotates the spline bearing, and the screw shaft of the main shaft rotate to move the main shaft in the axial direction and receive the transmission force of the drive unit to rotate the main shaft. And a nut that rotates at a speed less than the number of rotations, and when the main shaft rotates, the feed in the axial direction of the main shaft is moderated.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of a punching device according to an embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show a punching device 1 according to the present invention.
FIG. 1 is a side view, FIG. 2 is a front view, and FIG. 3 is a plan view. As shown in the figure, the punching device 1 is composed of a clamp portion 2 arranged in the upper part and a mechanism portion 4 arranged in a casing 3. The clamp portion 2 is provided with a pair of arm plates 5 attached to the upper end of the mechanism portion 4, and a support plate 6 is attached to the end portions thereof. Further, a nut 7 is attached to a side portion of each arm plate 5, and a bolt 9 attached to a pressing plate 8 is screwed into the nut 7. By rotating the handle 9a engaged with the bolt 9 to tighten the bolt 9, the gap between the support plate 6 and the pressing plate 8 becomes narrower, and by loosening the bolt 9, the gap becomes wider. Become.

FIG. 4 shows a sectional view of the mechanism section 4. As shown in the figure, the mechanism portion 4 penetrates the upper frame 11 and has a main shaft 12 arranged therein. The main shaft 12 is composed of an upper spline shaft 12a and a lower bolt shaft 12b, and is supported by bearings 15, 16 and 17 arranged on the upper frame 11 and the mounting plates 13 and 14, respectively.

The spline shaft 12a of the main shaft 12 has a hole saw 10 removably attached to the upper end thereof with a screw 12c, and a spring 10a is provided in the cylinder of the hole saw 10. A bellows rubber 10b is fitted to the upper end portion of the bearing 15 to cover a portion of the spline shaft 12a protruding from the casing 3.

As shown in FIG. 5, a sleeve 19 which is a spline bearing is arranged between the bearings 15 and 16 so as to be fitted to the teeth of the spline shaft 12a, and the main shaft 12 can slide in the axial direction. it can. Bearings 20 and 21 are arranged between the sleeve 19 and the bearings 15 and 16. A first sprocket 23 and a second sprocket 24 are vertically arranged side by side on the peripheral portion of the sleeve 19. Fourth sprocket 2 connected to first sprocket 23 and drive unit 25
6 is suspended by a chain 27. In the present embodiment, the drive unit 25 uses a motor capable of normal rotation and reversal, and is decelerated by a gear. In the present embodiment, the rotation number of the drive shaft 25a of the drive unit 25 is set to 50 rpm.

Next, the transmission force of the second sprocket 24 is
The intermediate transmission mechanism 30 that transmits to the third sprocket 28 will be described. As shown in FIG. 4, the shaft member 29 penetrates the mounting plate 13 and is supported by bearings 31 and 32 arranged on the mounting plates 13 and 14, respectively. The fifth sprocket 33 is attached to the upper portion of the shaft member 29, and the sixth sprocket 33 is attached to the lower portion thereof.
The sprocket 34 is attached. The second sprocket 24 and the fifth sprocket 33 are suspended by a chain 35, and the sixth sprocket 34 and the third sprocket 28 are suspended by a chain 36. In addition,
In this embodiment, the teeth of the first to sixth sprockets are 17, 32, 33, 14, 21, and 20 teeth.

A nut 37 is attached to the bolt shaft 12b of the main shaft 12.
The one-way clutch 3 around the nut 37.
8 and a bearing 39 are provided. The one-way clutch 38 is fitted to the above-described third sprocket 28, and the third sprocket 28 rotates in the normal direction with respect to the nut 37 (in this specification, the direction in which the hole saw 10 cuts the plate material 44 is the normal rotation). When turned to the 3rd sprocket 2
8 and the nut 37 are locked, and the nut 37
To rotate forward. Then, when the third sprocket 28 is reversed, the connection between the third sprocket 28 and the nut 37 is cut, and the third sprocket 28 is idled with respect to the nut 37. The pitch of the bolt shafts 12b is 2 mm, and when the bolt shafts 12b rotate once with respect to the nut 37, the main shaft 1
2 slides in the axial direction by 2 mm. A bearing 39 is provided between the nut 37 and the bearing 17.

FIG. 6 is a sectional view taken along line YY in FIG. As shown in the figure, a brake spring 40 as a brake member is provided around the nut 37. One end 40a of the brake spring 40 is fixed to the mounting plate 13, and the other end is idle. When the nut 37 normally rotates, the coil diameter of the brake spring 40 increases, and when the brake spring 40 reverses, the coil diameter of the brake spring 40 decreases. Spindle 1
When 2 rotates, a braking force is applied to the extent that the bolt shaft 12b and the nut 37 do not rotate together due to frictional resistance between the bolt shaft 12b and the nut 37.

A disc 41 is attached to the lower end of the main shaft 12 by bolts. The disc 41 is arranged between the upper detection switch 42 and the lower detection switch 43. These detection switches 42 and 43 detect the vertical position of the main shaft 12, and are attached to a fixed plate (not shown) so as to be slidable in the axial direction of the main shaft 12.

As described above, the punching device 1 according to the embodiment of the present invention.
The configuration has been described, and its operation will be described next.

The plate material 44 shown by the alternate long and short dash line in FIG. 1 is a stainless steel plate 44a having a thickness of 1 mm at the upper part and 20 to 20 at the lower part.
It is a wood 44b of 30 mm. The plate material 44 is sandwiched between the support plate 6 of the clamp part 2 and the pressing plate 8 to fix the punching device 1 to a predetermined position of the plate material 44. Then, the power switch (not shown) of the punching device 1 is turned on.

By turning on the power of the punching device 1,
The drive shaft 25a of the drive unit 25 shown in FIG. 4 rotates forward, and the fourth sprocket 26 rotates. The first sprocket 23 is
The chain 27 receives this power to rotate the sleeve 19 in the normal direction. As shown in FIG. 5, since the spline shaft 12 a of the main shaft 12 is fitted into the sleeve 19, the main shaft 1
When the 2 rotates, the hole saw 10 rotates in the direction of cutting the plate material 44.

On the other hand, the second sprocket 24 includes the drive unit 2
The transmission force of 5, with the chains 35 and 36 interposed,
Fifth sprocket 33, sixth sprocket 34 and third
It is transmitted to the sprocket 28. The rotation speed of the third sprocket 28 rotates in the same manner as that of the main shaft 12, but is reduced more than the rotation speed of the main shaft 12 due to the ratio of the teeth of the sprocket. If the nut 37 is stationary, the main shaft 12 moves upward by a pitch of 2 mm of the bolt shaft 12b every one rotation.

However, since the third sprocket 28 is normally rotated, the nut 37 is normally rotated integrally with the third sprocket 28 by the one-way clutch 38. Further, this turning force is sufficiently larger than the braking force of the brake spring 40. As described above, since the nut 37 rotates in the same direction as the main shaft 12, even if the main shaft 12 makes one rotation, the main shaft 12 does not make one rotation relative to the nut 37, and the main shaft 12 does not rotate. Slow down the upward movement speed of. In this embodiment, when the main shaft 12 makes one rotation, the main shaft 12 moves upward in the axial direction by 0.1 to 0.15 mm.

Therefore, the hole saw 10 fixed to the upper end of the main shaft 12 cuts the stainless plate 44a provided on the plate member 44 by gentle rotation and gentle feed. As a result, the teeth of the hole saw 10 become
4a is twisted to prevent teeth from slipping on the stainless steel plate 44a, and less frictional heat is generated.
The stainless steel plate 44a is not discolored by frictional heat. Also, the tooth of the hole saw 10 is less worn,
Lifespan is extended.

When the hole saw 10 cuts the stainless steel plate 44a and the disk 41 arranged at the lower end of the main shaft 12 comes into contact with the detection portion of the upper detection switch 42, the drive portion 25 reverses the drive shaft 25a. When the drive shaft 25a is reversed,
The first sprocket 23 receives this turning force by the fourth sprocket 26 and the chain 27, reverses the sleeve 19, and the main shaft 12 moves the hole saw 10 downward.

At this time, since the spindle 12 is reversed,
When the nut 37 is connected to the main shaft and tries to reverse due to frictional resistance with the bolt shaft 12b, the braking force of the brake spring 40 prevents the nut 37 from rotating in the reverse direction.
On the other hand, the second sprocket 24 sequentially transmits the transmission force of the drive unit 25 to the fifth sprocket 33, the sixth sprocket 34, and the third sprocket 28 via the chains 35 and 36. The third sprocket 28 reverses in the same manner as the main shaft 12, but the one-way clutch 38 idles the nut 37 in a stationary state.

Therefore, since the nut 37 of the main shaft 12 is stationary, the bolt shaft 12b is rotated every time the main shaft 12 makes one rotation.
Since it moves downward by a pitch of 2 mm, the time required to feed the hole saw 10 downward can be shortened. When the disc 41 arranged at the lower end of the main shaft 12 comes into contact with the detection part of the lower detection switch 43, the drive part 25 stops driving.

When the device for automatically collecting the ash of the cigarette arranged on the pachinko machine is installed, the above-mentioned plate material 44 formed by the stainless steel plate 44a and the wood material 44b.
I made a hole in the hole, but in order to make a hole, it was necessary to remove the pachinko machine with a normal hole saw before working.
With the punching device 1 according to the present embodiment, it is not necessary to remove the pachinko machine to make a hole, and the working time can be greatly shortened.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the driving force of the driving unit is transmitted using the sprocket and the chain.
The same effect can be obtained by using a gear or a pulley and a belt. Also, the drive unit
There are various methods of transmitting the driving force of the second sprocket 28 to the third sprocket 28.
Instead of interposing the sprocket 24, another sprocket may be provided below the sprocket 26 provided on the shaft portion 25a of the drive unit 25, and a chain may be suspended between this and the fifth sprocket 33.

In the present embodiment, the punching device 1 prevents the main shaft from being gently fed at the time of reversing. However, when it is not necessary to make it gentle, the one-way clutch 38 and the brake spring 40 are removed, and the nut 37 is removed. And the third sprocket 28 may be integrally formed.

Further, although stainless steel has been described as an example in the above embodiments, the present invention can be used for making holes in other metal materials, and also for making holes in fume tubes and the like.

[0029]

As described above, according to the boring device of the present invention, the feeding of the cutting tool can be slowed down. Therefore, even if it is difficult to make a hole, the material is not damaged. It can be opened. The life of the teeth of the cutting tool is extended.

[Brief description of the drawings]

FIG. 1 is a side view of a punching device according to an embodiment of the present invention.

FIG. 2 is a front view of the punching device.

FIG. 3 is a plan view of the punching device.

FIG. 4 is a cross-sectional view of a mechanical portion of the punching device.

5 is a cross-sectional view taken along line XX in FIG.

6 is a cross-sectional view taken along line YY in FIG.

[Explanation of symbols]

 1 Hole Punching Device 10 Hole Saw 12 Spindle 12a Spline Shaft 12b Bolt Shaft 19 Sleeve 23 First Sprocket 24 Second Sprocket 25 Drive Part 26 Fourth Sprocket 27, 35, 36 Chain 28 Third Sprocket 33 Fifth Sprocket 34 Sixth Sprocket

Claims (2)

[Claims] 1. A main shaft having a cutting tool attached to the tip of a spline shaft at one end and a screw shaft at the other end, a cylindrical spline bearing into which the spline shaft portion is slidably fitted, and this spline bearing By rotating the drive unit to be rotated and the screw shaft of the main shaft, the main shaft is moved in the axial direction, and at the same time, the transmission force of the drive unit is received so that the main shaft rotates at a speed lower than the number of rotations of the main shaft. A hole punching device comprising a nut, wherein the axial feed of the spindle is moderated when the spindle is rotated. 2. A clutch for preventing transmission of the transmission force of the drive unit to the nut when the main shaft is reversed,
2. The punching device according to claim 1, further comprising a brake member for stopping the rotation of the nut when the main shaft is turned over, and releasing the gentle feed of the main shaft when turning the shaft member over.