JP2003117720A - Cutting-beveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting-beveling device allowing a plurality of cutting tool holders to be operated always synchronously and also fed and returned at high speed. SOLUTION: This cutting-beveling device 10 for a pipe or the like comprises a housing 20, a gear box 30, a face plate 40, cutting tool holders 50 and a motor M. A speed change ring gear 60 with two gears 62, 64 with different diameters formed on the outer peripheral side and with a gear 66 formed on the inner peripheral side is disposed in the housing 20, and a face plate gear 42 is provided at the back face of the face plate 40. The gear box 30 has gears 32, 34 for rotating the face plate 40, and a feed-only gear group 310a and a high-speed feed-return gear group 310b. The face plate 40 is constantly rotated, but a change in the combination of the gears for rotating a power transmission shaft 70 for advancing/retreating the cutting tool holders 50 changes the difference of the number of teeth from the gears for rotating the face plate 40, thus carrying out high speed feed, low speed feed and high speed return of the cutting tool holders.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting / grooving device, and more particularly to the technical field of a device for cutting / grooving pipes in a nuclear power plant or the like.

[0002]

2. Description of the Related Art Conventionally, a cutting / grooving device has been used to cut a pipe or perform a groove processing. This cutting / grooving device is attached to the outside of the processing part of the pipe to be processed, and cuts the pipe and processes the groove, and includes a fixed part, a rotary body, and a blade. The fixed portion is fixed to the outside of the pipe, and a rotating body that is rotatable around the outer circumference of the pipe is attached to the front surface of the fixed portion. A pin protruding inward in the radial direction is fixed to the fixed portion.

The rotary body is provided with a plurality of blades via a bite holder. The bite holder is provided with a star wheel, and a screw for feeding a blade is connected to the rotation axis of the star wheel. That is, when the star wheel rotates, the blade moves in the radial direction.

The pin provided on the fixed portion and the star wheel provided on the bite holder constitute a tool feed mechanism. When the rotating body rotates, the star wheel provided on the rotating body projects radially. The star wheel rotates due to the impact, and the blade is fed by the screw connected to the star wheel. In this way, as the rotating body rotates, the star wheel is rotated little by little due to the collision with the pin, and the blade is fed.

[0005]

According to the conventional cutting and beveling machine as described above, since the pin and the star wheel collide with each other to feed the cutting tool, the pin and the star are always operated during the operation of the machine. Wheel contact and impact occur. Therefore, there is a risk that an operator may be caught in the contact portion during operation of the device. Moreover, there is a possibility that the rotating body may be displaced due to the impact and the processing accuracy may be reduced.

Further, in the star wheel feeding mechanism, the star wheel may fail to rotate even if the pin and the star wheel collide with each other, and as a result, the blades provided on the plurality of bite holders cannot be fed at the same pitch. There is. Further, in the feed mechanism using the star wheel, it is not possible to fast-forward and fast-return the blade because it is caused by a collision with the pin when feeding the blade and returning it to the original position. Therefore, there is a problem that it takes a long time before the blade comes into contact with the outer circumference of the pipe at the start of work. In addition, after the work is completed, it takes the same time as the time required for the cutting process to return the blade to the original position, or in order to reduce the time, each bite holder is individually Had returned to the position. When the bite holder is manually returned, the bite holder must be attached to the machine again in order to perform a new cutting operation. At that time, the positions of the blades held by the two bite holders in the radial direction. It is difficult to install them correctly so that they are the same. In addition, the allowable error of the radial protrusion of the blade is about ± 0.2 mm, and if the error is not within the allowable range, a large load is applied to the blade edge of the protruding blade, and the blade may break. Therefore, high accuracy is required for mounting.

Further, when the pipe is cut and the groove is machined at the work site, in the feed mechanism by the star wheel as described above, the cutting blade is fed by a constant feed amount at the moment when the pin and the star wheel come into contact with each other. Because,
A large load is applied to the device at the time of impact, which may cause a phenomenon such as escape of the device itself. As a result, there is a problem that the processing accuracy decreases and the processing surface becomes rough.At the end of processing, a line is formed on one side of the circumference of the pipe, which may cause welding defects or cause welding defects. There is a problem in that work and welding conditions must be changed.

[0008]

According to the present invention, there is provided a housing mounted on the outside of a workpiece, a face plate rotatably provided on the front surface of the housing, and a face plate attached to the face plate.
At least one tool holder for holding a tool, a gear box, and a motor are provided, and a gear for rotating the face plate and a gear connected to a power transmission shaft for moving the tool holder back and forth are arranged in the gear box. The number of teeth of the gear for rotating the face plate and the number of teeth of the gear for rotating the power transmission shaft are different, and the gear for rotating the face plate and the power are changed by changing the combination of gears for rotating the power transmission shaft. Change the difference in the number of gear teeth that rotate the transmission shaft,
Thus, the cutting / grooving device is characterized in that the rotational direction and rotational speed of the power transmission shaft relative to the rotational speed of the face plate are relatively changed to perform high-speed feed, low-speed feed, and high-speed return of the tool holder. By the above, the above-mentioned subject was solved.

[0009]

In the present invention, the combination of the gears in the gear box can cause a difference in the number of teeth of the gears connected to the face plate and the tool holder, thus reliably moving the tool holder back and forth on the face plate. Can be made. Therefore, when the tool holder moves, the device does not vibrate or generate noise. It is also possible to feed and return the tool holder at high speed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cutting / grooving apparatus 10 of the present invention, FIG. 1 (a) is a front view, and FIG. 1 (b) is a side view in a state where it is attached to a pipe. Cutting of the present invention
The groove processing device 10 is divided into two parts like the conventional device, and includes the housing 20, the gear box 30, and the face plate 4.
0, a bite holder 50, and a motor M, and are fixed to the outside of the pipe P by a plurality of feet H provided on the inner peripheral side of the housing 20. An annular transmission gear ring 60, which will be described later, is built in the housing 20, and a face plate 40 is rotatably attached to the front surface of the housing 20. Two bite holders 50 to which a bite (tool) 500 is attached are attached to the face plate so as to face each other. This tool is an example of the "tool" in claim 1, but there are two types of tools, one that produces chips during processing and the other that does not produce chips.

In FIG. 1, reference numeral C indicates a clutch.
When the device 10 is attached to the pipe P, the clutch C
With this, the connection with the motor is released, the face plate 40 is manually rotated, and after centering is performed using a dial gauge (not shown), the clutch C can be again connected to the motor. Thus, the clutch C allows the motor M and the face plate 4 to be removed without removing the motor M.
The centering work of the face plate 40 can be easily performed by disconnecting the connection with 0.

Further, in FIG. 1, reference numeral T is a torque limiter. The torque limiter T applies the power of the motor M to the gear box 3 when a load over a certain level is applied.
This is for preventing transmission to 0, and is designed not to damage the device 10 even if some abnormality occurs.

Further, reference numeral S in FIG. 1 indicates a scale plate, which indicates the position of the blade 500 during the work.

FIG. 2 is an exploded perspective view of the cutting / grooving apparatus 10 of FIG. 1, in which the motor M and the gear box 30 are not shown. A plurality of guide rollers 201 are provided inside the housing 20. The speed change gear ring 60 has two stages of gears (large diameter gear 62 and small diameter gear 64) having different numbers of teeth on the outer peripheral side and one stage gear (inner peripheral side gear 66) on the inner peripheral side. . Further, as shown in FIG. 2, an annular face plate gear 42 is provided on the back surface of the face plate 40.
Is provided.

FIG. 3 is a sectional view taken along line 3-3 of FIG. A groove 402 is provided on the inner surface of the face plate 40, and the guide roller 201 of the housing 20 is received in the groove 402 in the assembled state so that the face plate 40 rotates stably. The rotation of the motor M is transmitted to the face plate gear 42 via a gear in the gear box 30 described later.
That is, when the motor M rotates, the face plate 40 always rotates, and the transmission gear ring 60 rotates with the face plate 40.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 1 (a) and is a view for explaining a feed / return mechanism of the cutting tool holder 50 in the cutting / grooving apparatus 10 of the present invention. A power transmission shaft 70 is rotatably attached to a portion of the face plate 40 where the bite holder 50 is located via a bearing. A bevel gear 72 is provided at one end of the power transmission shaft 70, and an end gear 74 is provided at the other end. The end gear 74 meshes with the inner peripheral gear 66 of the transmission gear ring 60. That is, when the transmission gear ring 60 rotates relative to the face plate 40, the power transmission shaft 70 rotates accordingly.

The bite holder 50 includes a feed screw shaft 80 having a feed gear 82. The feed gear 82 rotates in mesh with the bevel gear 72 of the power transmission shaft 70, whereby the bite holder 50 shown in FIG. It is designed to move back and forth in the direction of the arrow. In addition, the end gear 74 of the power transmission shaft 70
Is engaged with the inner peripheral gear 66 of the transmission gear ring 60 to rotate, so that the two bite holders 50 provided on the face plate 40 move in synchronization.

As described above, the feed / return mechanism of the bite holder 50 in the cutting / beveling machine 10 of the present invention is not caused by the collision between the pin on the fixed side and the star wheel on the rotating side unlike the conventional one. The rotation of the motor is transmitted to each member (transmission gear ring 60, power transmission shaft 70, and feed screw shaft 80). Therefore, even while the cutting / grooving device 10 is operating, there is no risk of any impact or being caught in the device. Also, the bite holder 5
It is possible to reliably move 0 at a predetermined speed.

5 and 6 show the structure of the gear box 30 in the cutting / grooving apparatus 10 of the present invention. FIG. 5 is a front view with the cover removed, and FIG. 6 is a perspective view of FIG. 5, which corresponds to that seen from the direction of the arrow. However, in FIG. 6, the tooth profile of the gear is omitted. In FIG. 5, reference numeral mg is a main gear connected to a rotation shaft (not shown) of the motor M by a key, reference numeral ag is an auxiliary gear for stably rotating the main gear mg, and auxiliary gear ag. Does not contribute to the rotation of the face plate 40 and the feeding / returning of the bite holder 50.

As shown in FIGS. 5 and 6, the gear box 30 includes a driven gear 32, a face plate rotary gear 34, two composite gears 306a and 306b, and two transmission gears 30.
8a and 308b are arranged. One compound gear 30
6a (306b) and one transmission gear 308a (308
By b), a dedicated feed gear group 310b for performing high-speed feed and low-speed feed of the bite holder 50, and a high-speed feed-back gear group 310a for performing high-speed feed and high-speed return of the bite holder 50 are configured, respectively. There is. The driven gear 32 includes the main gear mg and the face plate rotary gear 3.
4 is always meshed with the gear 4 to transmit the rotation of the main gear mg to the face plate rotary gear 34.

The operations of the feed-dedicated gear group 310b and the high-speed feed-back gear group 310a are almost the same, and by engaging gears having different numbers of teeth, high-speed feed, low-speed feed, and high-speed return of the bite holder 50 are performed. I am supposed to do it.

A feed-dedicated gear group 310b for performing high-speed feed and low-speed feed of the bite holder will be described with reference to FIG. 7 and FIG. 8 described later.
Corresponds to the sectional view taken along line 7-7 and 8-8 of FIG.
In addition, the housing 20, the face plate 40, the speed change gear ring 6
0 and the motor M are illustrated. Compound gear 30
6b is a first gear 316b that is provided at the end of the shaft and meshes with the main gear mg, and is spline-fitted to the shaft.
A second gear 326b movable in the axial direction, and a third gear
The gear 336b is formed, and the rotation of the motor M is transmitted via the first gear 316b. The transmission gear 308b is composed of two gears (large diameter transmission gear 318b and small diameter transmission gear 328b) having different numbers of teeth.
8b is a small diameter gear 64 and a large diameter gear 6 of the transmission gear ring 60.
2 so as to mesh with the transmission gears 318b, 32, respectively.
The axis of 8b is different. That is, the two transmission gears 318b and 328b are separately formed.

When the second gear 326b and the third gear 336b, which are spline-fitted to the shaft, are slid upward in FIG. 7, the second gear 326b of the compound gear 306b and the large diameter transmission gear 318b mesh with each other, The rotation of the motor M is transmitted to the small diameter gear 64 of the transmission gear ring 60. on the other hand,
Second gear 326b and third gear 33 of compound gear 306b
When 6b is slid downward in FIG. 7, the composite gear 3
The third gear 336b of 06b meshes with the small diameter transmission gear 328b, and the rotation of the motor M is transmitted to the large diameter gear 62 of the transmission gear ring 60.

The number of rotations transmitted to the large diameter gear 62 of the transmission gear ring 60 differs depending on whether the compound gear 306b meshes with the large diameter transmission gear 318b or the small diameter transmission gear 328b having different numbers of teeth. That is, even if the rotation speed of the motor M is the same, the rotation of the motor M is large
8b is transmitted to the speed change gear ring 60, the speed change gear ring 60 is rotated at a high speed relative to the face plate 40, and when the rotation of the motor M is transmitted to the speed change gear ring 60 via the small diameter transmission gear 328b, the speed change gear is changed. Gear ring 60
Are rotated at a low speed relative to the face plate 40. But,
In either case, the transmission gear ring 60 rotates faster than the face plate 40. As described above, when the transmission gear ring 60 rotates with respect to the face plate 40, the bite holder 50 moves via the power transmission shaft 70.

Here, the face plate gear 4 provided on the face plate 40
When the number of teeth of 2 is Z, the number of teeth of the large diameter gear 62 of the transmission ring gear 60 is Z-2 and the number of teeth of the small diameter gear 64 is Z-4. That is, when the transmission gear ring 60 is rotated by a gear having the same number of teeth, the large-diameter gear 62 is rotated with respect to the face plate gear 43.
And the small diameter gear 64 has a difference in rotation by the difference in the number of teeth. The bite holder 50 is adapted to move due to such a difference in rotation, and when the rotation of the motor M is transmitted to the power transmission shaft 70 via the small diameter gear 64,
In one rotation, the power transmission shaft 70 rotates by four teeth, and when the rotation of the motor M is transmitted to the power transmission shaft 70 via the large diameter gear 62, one rotation transmits power by two teeth. Axis 70
Rotates. As described above, when the rotational speed transmitted to the speed change gear ring 60 is faster than that of the face plate 40, the bite holder is fed, and the feed speed depends on the difference in the rotational speed from the speed change gear ring 60.

Next, the tool is quickly sent to the processing position,
A high-speed feed-back gear group 310a for fast-feeding the bite holder 50 for quickly returning the processed bite and for high-speed return will be described with reference to FIG.
The high-speed feed-back gear group 310a includes a first gear 316a and a second gear 326, similar to the feed-only gear group 310b.
a and a compound gear 306a including a third gear 336a
And a transmission gear 308a including a large diameter transmission gear 318a and a small diameter transmission gear 328a.
7 and the small diameter transmission gear 328a are coaxial and integrally formed. Further, as shown in the figure, the large diameter gear 62 of the transmission ring gear 60 does not come into contact with the transmission gear 308a.

According to the structure of the high-speed feed-back gear group 310a, the bite holder 50 is fed when the rotation of the power transmission shaft 70 connected to the transmission gear ring 60 is relatively fast with respect to the rotation of the face plate 40. When the rotation of the power transmission shaft 70 is relatively slow with respect to the rotation of the face plate 40, the bite holder 50 is returned. That is, when the bite holder 50 is returned, the second gear 326a and the third gear 336a, which are spline-fitted to the shaft, are slid upward in FIG. 8, and the second gear 326a of the compound gear 306a and the large-diameter transmission gear. The rotation of the motor M is transmitted to the small diameter gear 64 of the transmission gear ring 60 by meshing with the gear 318a. On the other hand, when sending the bite holder 50, the composite gear 3
The second gear 326a and the third gear 336a of 06a are shown in FIG.
The third gear 336a of the compound gear 306a is meshed with the small diameter transmission gear 328a, and the rotation of the motor M is transmitted to the small diameter gear 64 of the transmission gear ring 60 via the large diameter transmission gear 318a. To do so.

The feed-dedicated gear group 310 described above
b, and the compound gear 306 of the high-speed feed-back gear group 310a
Support arms Ab and Aa for moving the compound gears 306b and 306a in the axial direction are attached to the shafts of b and 306a. As shown in FIG. 6, the support arms Ab and Aa are
Lever Lb, La via rods Rb, Ra, respectively
Are linked to. Then, the operator operates the levers Lb and La.
By operating the feed-only gear group 310b,
Alternatively, the compound gear 306b of the high-speed feed-back gear group 310a,
306a is moved in the axial direction to perform high speed feeding, low speed feeding, and high speed returning of the bite holder 50.

Here, FIG. 7 and FIG. 8 show the compound gear 30.
6b, 306a second gear 326b, 326a and third gear 336b, 336a both transmission gear 308b, 3
08a does not mesh with the compound gears 306b and 306a.
Indicates a state in which it is in the so-called neutral position. At this time, the rotation of the motor M is not transmitted to the power transmission shaft 70, and only the face plate 40 and the transmission gear ring 60 rotate. Therefore, in this state, the bite holders 50, 5
0 does not move forward or backward.

As shown in FIG. 6, the two rods Ra, R
b is independently rotated by the operation of the levers La and Lb in the axial direction, and is in contact with each other at its ends. Further, as shown in FIG. 1A, the levers La and Lb are provided with switching step portions 921a and 922.
a, 921b, 922b, and holes 90a, 90b having neutral portions 94a, 94b, respectively, projecting outside the device, and the switching step portions 921a, 922a, 921.
The states of the levers La and Lb operated by b and 922b and the neutral portions 94a and 94b are held. In FIG. 1A, the lever La protruding from the hole 90a is connected to the high-speed feed-back gear group, and when the lever La is engaged with the switching step portion 921a, the high-speed return engages the switching step portion 922a. And high speed feed is done. On the other hand, the lever Lb protruding from the hole 90b
Is connected to a gear group dedicated to the feed, and when the lever Lb is engaged with the switching step portion 921b, high-speed feed is achieved.
When engaged with 2b, low speed feed is performed. It should be noted that the levers La and Lb are not shown in FIG.

Here, when one lever La (Lb) is engaged with the switching step portion 921a or 922a (92b, 922b), the rod Ra (Rb) connected to one lever La (Lb) is connected to the other. Push the rod Rb (Ra) of
The other lever Lb (La) is engaged with the neutral portion 94b (94a). Therefore, the lever La (L
By the operation of b), one of the composite gears 306a (306
When b) is in mesh with the transmission gear 308a (308b), the other compound gear 306b (306a) is prevented from meshing with the transmission gear 308b (308a). Therefore, by mistake, both compound gears 306a and 306b
However, it does not mesh with the transmission gears 308a and 308b.
On the other hand, both levers La and Lb are set to the neutral portions 94a and 94.
It can be located at b. In this state, since the rotation of the motor M is not transmitted to the power transmission shaft 70, the bite holders 50, 50 do not move back and forth. The holes 90a,
The shape of 90b and the switching step 9 provided in the holes 90a and 90b
21a, 922a, 921b, 922b are the same as those in FIG.
It goes without saying that other than those shown in FIG.

Further, if these levers La and Lb are driven by an air cylinder or the like, the cutting / grooving apparatus 10 can be operated remotely or can be automated, so that a nuclear facility or a contaminated environment can be obtained. Suitable for working inside.

[0033]

With the above construction, the cutting and beveling machine of the present invention has a remarkable effect that the machining tool can be reliably moved forward and backward without generating vibration or noise. Thus, the processing accuracy is improved and the work can be performed safely.

Further, by operating the lever, it is possible to easily perform high-speed feed, low-speed feed, and high-speed return of the tool holder. As a result, there is an effect that the tool can be moved at high speed to the vicinity of the object to be machined at the start of machining, or the time for returning the tool to the original position after the machining can be significantly shortened.

Since the plurality of tool holders advance and retreat in synchronization with each other and the high speed return can be performed, it is not necessary to remove the tool holders. Therefore, the relative positions of the plurality of tool holders are always displaced. There is no.

If a clutch is provided between the motor and the face plate as in claim 4, it is not necessary to remove the motor one by one when mounting on a workpiece and performing centering work. This has the effect of facilitating the work.

[Brief description of drawings]

FIG. 1 shows a cutting / grooving apparatus of the present invention.
1A is a front view, and FIG. 1B is a side view.

FIG. 2 is an exploded perspective view of a main part of the apparatus shown in FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is a front view of the gear box with a cover removed.

FIG. 6 is a perspective view of FIG.

FIG. 7 is a diagram corresponding to a cross-sectional view taken along line 7-7 of FIG. 5 and illustrating a feed-dedicated gear group for performing high-speed feed and low-speed feed of the bite holder.

8 is a diagram corresponding to a cross-sectional view taken along line 8-8 of FIG. 5 and illustrating a high-speed feed-back gear group for performing high-speed feed and high-speed return of the bite holder.

[Explanation of symbols]

10: Cutting / beveling machine 20: Housing 30: Gear box 310a: Feed-only gear group 310b: High speed feed-back gear group 40: Face plate 42: Face plate gear 50: Tool holder (bite holder) 500: Tool (bite) 60: Variable speed gearing 62: Large diameter gear 64: Small diameter gear 70: Power transmission shaft Aa, Ab: Support arm Ra, Rb: Rod

Claims (5)

[Claims] 1. A housing attached to the outside of a workpiece, a face plate rotatably provided on the front surface of the housing, at least one tool holder attached to the face plate for holding a tool, and a gear box. , A motor, and a gear for rotating the face plate in the gear box,
A gear connected to a power transmission shaft for moving the tool holder forward and backward is arranged, and the number of teeth of the gear for rotating the face plate is different from the number of teeth of the gear for rotating the power transmission shaft to rotate the power transmission shaft. By changing the combination of gears, the difference in the number of teeth between the gear that rotates the face plate and the gear that rotates the power transmission shaft is changed, and thus the rotation direction and rotation speed of the power transmission shaft relative to the rotation speed of the face plate are changed. A cutting / beveling machine, characterized in that the tool holder is relatively changed to perform high-speed feed, low-speed feed, and high-speed return. 2. An annular face plate gear is provided on the back surface of the face plate, and the face plate gear is adapted to mesh with a gear in the gear box so that the face plate is always rotated. A speed change gear ring, which is annular and has two different diameters on the outer peripheral surface and one gear on the inner peripheral surface, is arranged. The power transmission shaft includes a dedicated feed gear group in the gear box and a high-speed feed. The feed-only gear group and the high-speed feed-return gear group are composed of a plurality of gears, and two gears that mesh with the composite gear and have different diameters. The combination of the gear forming the composite gear and the gear forming the transmission gear causes a difference in the number of teeth of the gear that rotates the face plate and the number of teeth of the gear that rotates the power transmission shaft. It has manner, cutting and grooving device according to claim 1. 3. A support arm for movably supporting the composite gear in the axial direction is provided on the composite gear of the special-purpose feed gear group and the high-speed return gear group, and each support arm is provided with a rod via a rod. A lever is provided, the lever protruding from the gear box, and a combination of a gear forming the composite gear and a gear forming a transmission gear in the feed-only gear group and the high-speed feed-back gear group by the lever. Is designed to change
The cutting / grooving device according to claim 1 or 2. 4. The disconnection according to claim 1, wherein a clutch is provided between the motor and the face plate so that the face plate can be rotated without removing the motor. Bevel processing equipment. 5. The movement of the lever is restricted by the rod so that the composite gear and the transmission gear of the feed-only gear group and the composite gear and the transmission gear of the high-speed feed-back gear group do not mesh at the same time. The cutting / grooving device according to any one of claims 1 to 4.