JPH06285708A - Machining device for deep hole inner diameter - Google Patents

Abstract

PURPOSE:To precisely machine the inner face of a deep hole which is lightweight and small-sized and has high strength. CONSTITUTION:A rotary center shaft 16 capable of being supported at the axis in a deep hole 8 is rotated by a drive motor 21, a work bench 43 moved in the axial direction along the rotary center shaft 16 is provided, a machining tool 46 movable in the radial direction is fitted to the work bench 43, and feed/radial shift adjusting shafts 36, 40 feeding the work bench 43 in the axial direction and shifting the machining tool 46 in the radial direction are arranged along the rotary center shaft 16. The rotation of the adjusting shafts 36, 40 can be stopped by feed/radial shift phase adjusting devices 28, 30 provided on a differential gear device 20 without causing corotation. The feed/radial shift adjusting shafts 36, 40 are rotated by feed/radial shift adjusting motors 31, 32 provided on the phase adjusting devices 28, 30 to feed the work bench 43 and adjust the radial position of the machining tool 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep hole inner diameter machining apparatus.

[0002]

2. Description of the Related Art When constructing a nuclear reactor, depending on the model of the nuclear reactor, a method of first constructing a building and then suspending and installing a reactor pressure vessel in the constructed building is adopted. There is. As shown in FIG. 4, the reactor pressure vessel 1 is integrally provided with a large number of nozzles 2 for piping.
As described above, in the system in which the reactor pressure vessel 1 is suspended and installed after the building 3 is built, the nozzle 2 is
Since it interferes with the top slug 5 and the like of the equipment arrangement space 4 in which the piping and the like are installed, it is cut short and after the installation, the additional portion 6 is added locally by welding 7. In order to reduce the pressure load when the high pressure fluid is blown out, the nozzle 2 generally has a curved surface shape in which the diameter of the inner surface is expanded toward the tip side as shown in the drawing.

As described above, in the field welded nozzle 2, the inner surface of the nozzle 2 needs to be finished locally, but as described above, the inner surface of the nozzle 2 has a deep hole 8 and a curved shape. In addition to having the above, highly accurate processing is required, which makes the processing work extremely difficult.

Conventionally, when machining the deep hole 8 as described above, a horizontal boring machine 9 as shown in FIGS. 4 and 5 is used. The crossing board 9 is a slide base 1 arranged at the bottom of the equipment arrangement space 4 of the building 3 via a mounting base 10.
1 and a traverse table 12 that moves along the slide table 11.
And an elevating table 13 supported by the traverse table 12 so as to be able to elevate.
And a working frame 15 having a working tool 14 at its tip, which is attached to the elevating table 13 so as to be capable of expanding and contracting along the axial direction of the nozzle 2.

In the machining operation, the cross boring machine 9 is
The machining frame 15 is installed in the equipment arrangement space 4 of the building 3 so that it is exactly parallel to the axis of the nozzle 2, and the traverse table 12 is arranged so that the axis of the machining frame 15 coincides with the axis of the nozzle 2. After moving up and down the elevating table 13, the machining tool 14 of the machining frame 15 is rotated, and the machining frame 15 moves the machining tool 14 in the two axial directions of the nozzle and adjusts the radial position of the machining tool 14. Go to
The deep hole 8 on the inner surface of the nozzle 2 is processed.

[0006]

However, in the deep hole inner diameter machining apparatus using the conventional cross boring machine 9, since the machining frame 15 is cantilevered, the apparatus structure is large and has a rigid structure. Therefore, it is not possible to carry in and install the cross boring machine 9 as it is into the equipment arranging space 4. Therefore, conventionally, the cross boring board 9 is disassembled into small pieces and carried into the equipment arranging space 4 again. Although the work of assembling and installing is performed, there is a problem that such disassembling / assembling work requires a great deal of labor and time.

Further, as described above, when the cross boring machine 9 becomes large, unnecessary movement of the device due to inertia becomes large, and it becomes difficult to perform machining with high accuracy.

The present invention has been made in view of the above problems of the prior art, and provides a machining device for a deep hole inner diameter, which is lightweight, compact, has high strength, and is capable of accurately machining the inner surface of a deep hole. With the goal.

[0009]

According to the present invention, there is provided a rotation center shaft that is rotatably supported at an axial center position in a deep hole, and is arranged outside the deep hole and connected to the rotation center shaft. A differential gear device, and a drive motor that rotationally drives the rotation center shaft in preparation for the differential gear device,
A main gear fixed to the rotation center axis, in-out gears for feed and radial movement supported by a differential gear device rotatably around the rotation center axis, outer gears of each in-out gear, and the main gear. And a phase adjustment device for feeding and radial movement in which the rotation ratio of each in-out gear can be arbitrarily set, and a feed for rotating each in-out gear separately for each phase adjustment device. And an adjusting motor for radial movement, one end of which is arranged in parallel with the rotation center shaft and is rotatably supported near the tip of the inside of the deep hole of the rotation center shaft, and the other end of which is the inner gear of the feed-in / out gear. The feed adjusting shaft connected to the output gear that is meshed with, and one end that is arranged in parallel with the rotation center shaft and has one end rotatably supported in the vicinity of the distal end inside the deep hole of the rotation center shaft and the other end. The transfer The radial movement adjusting shaft connected to an output gear meshed with the inner gear of the use-in Autogia,
A worktable having a nut hole that is non-rotatable with respect to the rotation center axis and is movable in the axial direction and has a nut hole that is screwed into the feed adjustment shaft; and the diameter-movement adjustment shaft provided on the worktable. A deep hole inner diameter machining device, characterized in that it includes a radial movement machining device that is fitted movably in the axial direction and that moves a machining tool in the radial direction by rotation of the radial movement adjustment shaft. Is.

[0010]

In the present invention, the rotation center shaft is set at the axial center position in the deep hole, the feed adjusting motor of the feed phase adjusting device is driven, and the feed adjusting shaft is rotated to deepen the workbench. Move it into place in the hole.

Next, when the central axis of rotation is rotated at a constant speed by driving the drive motor, the main gear provided on the central axis of rotation rotates, and through the phase adjusting device for feeding and radial movement,
The feed and radial movement in / out gears rotate synchronously at a specified rotation ratio, which causes the feed adjustment shaft and radial movement adjustment shaft that mesh with each inner gear via the output gear to rotate. In the state where the rotation is fixed with respect to the central axis (does not cause rotation), the central axis rotates together with the central axis of rotation, so that at this time, the axial position of the work table and the radial position of the machining tool are It never changes.

From this state, the feed adjusting motor is driven to rotate the feed adjusting shaft at a predetermined rotation speed to move the workbench at a predetermined feed speed in the axial direction of the rotation center axis. By driving the radial movement adjustment motor and rotating the radial movement adjustment shaft to adjust the radial position of the processing tool, the inner diameter of the deep hole can be automatically machined in the axial direction.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a rotation center shaft 16 having a required length and strength is provided so that one end is inserted into the deep hole 8 of the nozzle 2 and the rotation center shaft 1 is provided.
A bearing 17 is attached to one end of the bearing 6, and a support arm 18 that can be adjusted in the radial direction is attached to the bearing 17 so that one end of the rotation center shaft 16 can be rotatably supported by the axial center of the deep hole 8. .

The other end of the rotation center shaft 16 is projected from the end of the nozzle 2 to the outside and is connected to a differential gear device 20 installed on a support 19 such as a building.

As shown in FIGS. 2 and 3, the differential gear unit 20 is configured to drive the rotation center shaft 16 by a drive motor 21 via drive gears 22 and 23, and further to drive the rotation center. Main gear 24 on shaft 16
Is fixed.

The differential gear device 20 includes:
Two in-and-out gears 2 having a large diameter and rotatably supported around the rotation center shaft 16 for feeding and for diametrical movement.
5, 26 are provided so as to sandwich the main gear 24 in the axial direction, and the outer gear 27 of the feed-in / out gear 25 is provided.
And a feed phase adjusting device 28 that meshes with the main gear 24.
And the outer gear 29 of the radial movement in-out gear 26
And a phase adjusting device 3 for radial movement that meshes with the main gear 24.
It has 0 and. Each of the phase adjusting devices 28 and 30 has
The rotation of each of the in / out gears 25 and 26 is controlled by the main gear 24.
It is possible to rotate at a required set rotation ratio in synchronization with the rotation of the.

Further, the feed phase adjusting device 28 can rotate the feed in / out gear 25 separately from the synchronous rotation with the main gear 24.
1, and the phase adjusting device 30 for radial movement
Includes a feed adjusting motor 32 capable of rotating the radial movement in / out gear 26 separately from the synchronous rotation with the main gear 24, and the phase adjusting devices 28, 3 are provided.
The number 0 is attached to the differential gear device 20 in a detachable manner.

As shown in FIGS. 1 to 3, the rotation center shaft 16 is disposed in parallel with the rotation center shaft 16 and has one end in the vicinity of one end portion inside the deep hole 8 of the rotation center shaft 16 via a bearing 33. Output gear 3 whose other end is meshed with the inner gear 34 of the feed-in / out gear 25.
A feed adjusting shaft (screw shaft) 36 connected to the No. 5 is provided. Similarly, it is arranged parallel to the rotation center shaft 16, one end of which is rotatably supported near one end of the rotation center shaft 16 in the deep hole 8 through a bearing 37 and the other end of which is the main gear 24.
There is provided a radial movement adjusting shaft 40 which is connected to an output gear 39 which penetrates through the output gear 39 and which is meshed with the inner gear 38 of the radial movement in-out gear 26. The diameter adjustment shaft 4
0 has a non-circular cross section, for example, a rectangular cross section.

Further, a work table 43 having a nut 42 which is non-rotatable and axially movable with respect to the rotation center shaft 16 and which is screwed onto the feed adjusting shaft 36 is installed. .

Further, a driven gear 44 having a center portion fitted to the radial movement adjustment shaft 40 of the rectangular cross section so as to be movable in the axial direction is disposed on the work table 43, and the radial movement adjustment shaft 44 is provided. A radial movement processing device 47 is installed so that the processing tool 46 can be moved in the radial direction via the driven gear 44 and the intermediate gear 45 by the rotation of the shaft 40.

As shown in FIG. 1, an intermediate bearing 48 is provided at an intermediate portion in the longitudinal direction of the rotation center shaft 16 so as to support the rotation center shaft 16 at the center of the nozzle 2 axis (center of the deep hole). There is. The intermediate bearing 48 has an inner ring 49 through which the rotation center shaft 16 and the adjusting shafts 36 and 40 for feeding and radial movement penetrate.
And an outer ring 51 having a support arm 50 that is adjustable in the radial direction.

The operation of the above embodiment will be described below.

The rotation center shaft 16 connected to the differential gear device 20 is inserted into the deep hole 8 and is positioned at the axial center position of the deep hole 8 via the support arm 18 of the bearing 17 and the support arm 50 of the intermediate bearing 48. The rotation center shaft 16 is installed, and the differential gear device 20 is fixed on the support base 19.

The radial movement adjusting motor 32 of the radial movement phase adjusting device 30 is driven to rotate the radial movement adjusting shaft 40 in a direction in which the processing tool 46 can be pulled in the radial direction, and then the feed phase adjusting device 28. By driving the feed adjusting motor 31 and rotating the feed adjusting shaft 36, the work table 43 is moved to a predetermined position in the deep hole 8.

Next, when the rotation center shaft 16 is rotated at a constant speed by the driving of the drive motor 21, the main gear 24 of the differential gear device 20 is rotated, and via the phase adjusting devices 28 and 30 for feeding and radial movement. The in-out gears 25, 26 for feeding and radial movement synchronously rotate in the same direction as the main gear 24 at the set rotation ratio (reduction ratio) with respect to the main gear 24. In the state where the feed adjusting shaft 36 and the radial movement adjusting shaft 40 meshing with the inner gears 34 and 38 of the reference numeral 26 are stopped from rotating with respect to the rotation center shaft 16 (does not rotate together), It rotates with the shaft 16, so that at this time the axial position of the work table 43 and the radial position of the working tool 46 do not change.

From this state, the feed adjusting motor 31
Is driven to rotate the feed adjustment shaft 36 at a predetermined rotation speed to move the work table 43 in the axial direction of the rotation center shaft 16 at a predetermined feed speed, and at the same time, the radial movement adjustment motor 32
The inner diameter of the deep hole 8 can be automatically machined to an arbitrary taper or a curved surface by driving and rotating the radial movement adjusting shaft 40 to adjust the radial position of the machining tool 46.

According to the above-described processing apparatus, the apparatus can be made extremely small, and therefore can be carried in and installed in a narrow apparatus arrangement space without disassembling, and further, the rotation center shaft 16 can be supported by the support arm 18. Bearing 1 having 50
Since it is supported at two points of 7 and 48, a large device strength can be maintained, and since the in / out gears 25 and 26 can have a large diameter, a large feed or radial movement torque is generated. Therefore, high strength and reduction in inertia enable high-precision processing.

The present invention is not limited to the above-mentioned embodiments, but can be applied to the processing of deep holes other than nozzles, and other various modifications are possible without departing from the gist of the present invention. Of course, it is possible to add.

[0030]

According to the deep hole inner diameter processing apparatus of the present invention,
A rotation center shaft is provided which can be supported on the shaft center in the deep hole, and the rotation center shaft can be rotated by a drive motor through a differential gear device, and the rotation center shaft is axially arranged along the rotation center shaft. A workbench that moves to the workbench is provided, and a machining tool that is movable in the radial direction is attached to the workbench, and an adjustment shaft for feeding and radial movement for axially feeding the workbench and radially moving the machining tool Is arranged along the rotation center axis, and each of the two adjustment shafts is rotated with respect to the rotation center axis without being rotated by the feed and radial movement phase adjustment device provided in the differential gear device. Of the working table and the radial direction of the working tool by rotating the adjusting shaft for feeding and radial movement arbitrarily by the adjusting motor for feeding and radial movement provided in each phase adjusting device. Rank Since the device can be adjusted, it is possible to make the device compact and simple, and to have a large strength. Therefore, by reducing the inertia and improving the strength by downsizing, it is possible to process the inner surface of the deep hole with high accuracy. In addition to the above, it is possible to achieve excellent effects such as that the miniaturization makes it possible to easily install and remove the processing device in a narrow device arrangement space.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

3 is a schematic diagram showing the operating principle of the differential gear device of FIG. 1. FIG.

FIG. 4 is a side view showing an example of a conventional deep hole inner diameter processing apparatus.

5 is a perspective view of the cross boring machine shown in FIG. 4; FIG.

[Explanation of symbols]

 8 Deep Hole 16 Rotation Center Shaft 20 Differential Gear Device 21 Drive Motor 24 Main Gear 25 In / Out Gear 26 In / Out Gear 27 Outer Gear 28 Feed Phase Adjuster 29 Outer Gear 30 Diameter Shift Phase Adjuster 31 Feed Adjuster Motor 32 Adjusting motor for radial movement 34 Inner gear 35 Output gear 36 Adjusting shaft for feeding 38 Inner gear 39 Output gear 40 Adjusting shaft for radial movement 43 Work table 46 Processing tool 47 Radius moving processing device

Claims (1)

[Claims] 1. A rotation center shaft which is rotatably supported at an axial center position in a deep hole, and a differential gear device which is disposed outside the deep hole and is connected to the rotation center shaft.
A drive motor for rotationally driving the rotation center shaft in preparation for the differential gear device, a main gear fixed to the rotation center shaft, and a feed and diameter supported by the differential gear device so as to be rotatable about the rotation center shaft. In / out gear for movement, an outer gear of each in / out gear and a main gear, and a phase adjusting device for feed and diameter movement capable of arbitrarily setting the rotation ratio of each in / out gear by meshing separately. An adjusting motor for feeding and radial movement, which is capable of separately rotating each of the in / out gears for each phase adjusting device,
The output gear is arranged in parallel with the rotation center shaft, one end of which is rotatably supported near the inner end of the deep hole of the rotation center shaft, and the other end of which is connected to an output gear that meshes with the inner gear of the feed-in / out gear. And the feed adjusting shaft, the one end of which is disposed in parallel with the rotation center shaft and has one end rotatably supported in the vicinity of the inner end of the deep hole of the rotation center shaft and the other end of which is the inner gear of the radial movement in-out gear. A radial movement adjusting shaft connected to the output gear that meshes with, and a nut hole that is non-rotatably attached to the rotation center shaft and is movable in the axial direction and that is screwed into the feed adjusting shaft. A workbench, and a radius movement processing device that is disposed on the workbench and movably fitted in the radial movement adjustment shaft in the axial direction and moves a machining tool in a radial direction by rotation of the diameter movement adjustment shaft. With deep hole inner diameter .