JPH079203A - Spherical surface processing machine - Google Patents

Abstract

PURPOSE:To provide a spherical surface processing machine compactly constituted, and capable of accurately and easily adjusting the position of a cutter. CONSTITUTION:A spherical processing machine includes a concentric biaxial rotary shaft constituted of an outside shaft 3 and an inside shafts 8. The outside shaft 3 is rotated by an electric motor 1 through a worm gear 2, so as to rotate a tool post 5 through a bushing 4 in the direction shown by an arrow A. And the inside shaft 8 is also rotated through gear mechanisms 9 to 12, so as to give the axial feeding to a link attaching metal fitting 13, and the tool post 5 to be connected to the other end of a link mechanism 14 is moved in the circular arc direction shown by an arrow B, thereby a work 7 is subjected to spherical-processing by a cutter 6 attached to the tool post 5. The tool post 5 can be vertically moved through the gear mechanism, thereby the position of the cutter 6 can be accurately and easily adjusted according to the spherical surface processing diameter of the work 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical surface processing machine, for example, a spherical surface processing machine optimal for processing a spherical surface portion of a bearing stand of a journal bearing of a steam turbine.

[0002]

2. Description of the Related Art Generally, since a bearing of a steam turbine has a large load, the bearing has a high surface pressure and a high peripheral speed, so that a journal bearing (flat bearing) is used. In many of these journal bearings, the back surface of the bearing metal is a spherical seat so that the shaft center line and the bearing center line automatically coincide with each other. Along with this, the bearing stand that supports the bearing is also formed into a spherical surface. The spherical surface of this journal bearing is the outer surface and is machined by cutting, but the spherical surface of the bearing base is the inner surface and requires special machining.

Conventionally, when machining such a spherical surface portion, a model is created, and a tool is moved by a servo mechanism following the model to machine a spherical surface according to the model. NC (numerical control) instead
A machine tool that processes with the command tape of is used.

[0004]

As described above, the spherical processing machine currently in use does not use a dedicated machine and can only be used with a hydraulic copying machine or a machine tool with NC. It comes with many features. Therefore, the processing machine is inevitably large, requires a large processing space, and has a high processing cost.

The present invention has been made in order to solve the problems of the prior art, and a spherical processing machine which can be compactly constructed as a processing machine, does not require a large processing space, and can reduce processing costs. The purpose is to provide.

Another object of the present invention is to provide, as an optimum spherical surface processing machine of this type, a spherical surface processing machine capable of accurately and easily adjusting the position of a cutting tool in accordance with the spherical surface processing diameter of a workpiece. .

[0007]

In order to solve the above-mentioned problems, a spherical processing machine according to the present invention has a concentric two-axis rotary shaft composed of an outer shaft and an inner shaft, and a worm gear having the outer shaft. An electric motor for rotating the inner shaft by a rotation of the outer shaft, a gear mechanism for rotating the inner shaft by the rotation of the outer shaft, a tool rest that is rotated by the rotation of the outer shaft, and a screw part of the inner shaft. A link mounting hardware that moves in the axial direction when the inner shaft rotates, and a link mechanism that connects the link mounting hardware to the tool rest and moves the tool rest in an arc direction by the axial movement of the link mounting hardware. Include.

[0008]

According to the above means, the outer shaft rotates via the worm gear due to the rotation of the electric motor, whereby the tool rest rotates about the center of the tool rest. At the same time, when the inner shafts of the two concentric shafts are rotated via the gear mechanism, the link attachment hardware screwed into the threaded portion of the inner shaft moves in the axial direction. Since this link mounting hardware is connected to the tool rest by the link mechanism, the tool rest is moved in the arc direction. By these two operations, the tool post and the tool attached to the tool post are given rotational and circular motions,
Spherical processing can be performed.

Further, in such a spherical processing machine, the tool rest is a cylindrical tool rest having a threaded portion in a part thereof, and the tool rest is vertically moved by being screwed into the threaded portion of the cylindrical tool rest. By providing the gear mechanism, the tool rest can be moved up and down via the gear mechanism, whereby the position of the tool can be accurately and easily adjusted according to the spherical machining diameter of the workpiece.

[0010]

Embodiments of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a vertical sectional view showing an embodiment of a spherical surface processing machine according to the present invention. In FIG. 1, when the electric motor 1 with a continuously variable speed reducer is activated, the outer shaft 3 is rotated by the worm gear 2 attached to the electric motor shaft. Outer shaft 3
Is rotated, the bearing cylinder 4 attached to the outer shaft 3 is also rotated, and the tool rest 5 attached to the bearing cylinder 4 is also indicated by the arrow A.
Rotate in the direction of. A tool (bite) 6 is attached to the tool rest 5 to cut the inside of the work 7 in the circumferential direction.

At the same time, the inner shaft 8 which is coaxial with the outer shaft 3 is rotated by a gear mechanism composed of gears 9, 10, 11 and 12. When the inner shaft 8 rotates, the link mounting hardware 13 screwed into the threaded portion of the inner shaft 8 is fed and moved in the axial direction. Since the link mounting hardware 13 is connected to the tool rest 5 via the link mechanism 14, when the link mounting hardware 13 moves in the axial direction, the tool rest 5 is fed in the arc direction indicated by arrow B. By performing these two machining operations successively, it becomes possible to spherically machine the workpiece 7 with the blade 6.

Next, FIGS. 2 and 3 are a longitudinal sectional view and a lateral sectional view of a tool post portion showing another embodiment of the spherical surface processing machine according to the present invention. In this embodiment, the vertical position of the cutting tool 6 in the spherical processing machine shown in FIG. 1 can be adjusted accurately and easily in accordance with the spherical processing diameter of the workpiece 7.

That is, in FIGS. 2 and 3, the blade 6 for processing the inner spherical surface of the work 7 is fitted into the cylindrical tool rest 5 and fixed by the blade fixing bolt 21. Turret 5
A screw (male screw) 22 is cut at the bottom of the
A driven-side bevel gear 24 having a screw (female screw) 23 screwed into it and a drive-side bevel gear 25 that meshes with the driven-side bevel gear 24 are provided, and a drive portion is provided on a shaft portion of the drive-side bevel gear 25. (Adjustment screw part) 26 is attached. Further, a groove 27 is cut in the tool rest 5, and a detent bolt 28 is engaged with the groove 27 to prevent detent.

The tool rest 5 is supported by a tool rest mount 29 so as to be vertically movable. In addition, the drive-side bevel gear 2
The shaft of 5 extends through the bush 30.

The link mechanism 14 that moves in the axial direction by the rotation of the inner shaft 8 tilts the tool rest mounting base 29 via the link mounting hardware 31. That is, the pair of arms 31 holding the tool rest mounting base 29 change their inclination angles with the pins 32 as fulcrums. The pin 32 is inserted into a bush 34 of a fixed ring 33 that holds the bearing tube 4.

Next, the operation will be described. When the drive unit 26 of the drive-side bevel gear 25 is artificially rotated from the outside, the driven-side bevel gear 24 is engaged and rotated, and its screw (female screw) 23 is screwed into the screw 23. The tool rest 5 is moved in the up-down direction via the screw (male screw) 22 of 1., whereby the tool 6 held by the tool rest 5 is easily adjusted to an accurate position corresponding to the machining spherical diameter of the work 7.

2 and 3, the bevel gears 24 and 25 are used as a gear mechanism for screwing the screw 22 of the cylindrical tool rest 5 to move the tool rest 5 up and down. Instead of this, for example, a worm gear 41 as shown in FIG. 4 or a face gear 42 as shown in FIG. 5 can be used.

That is, in FIG. 4, if the worm 43 of the worm gear 41 is rotated via a drive portion (not shown) provided on the shaft of the worm gear, the worm gear 41 is screwed onto the screw (male screw) 22 of the tool rest 5. Mating screw (female screw) 4
The tool rest 5 can be moved up and down via 4.
Further, in FIG. 5, the pinion 4 of the face gear 42 is
5 is rotated via the drive unit 46, the face gear 42 is a screw (female screw) that is screwed into the screw (male screw) 22 of the tool rest 5.
The tool rest 5 can be moved up and down via 47.

[0020]

As described above, according to the spherical surface processing machine of the present invention, since it is a dedicated machine provided with a function for spherical surface processing, it can be made compact as a processing machine. Therefore, there is a great effect that contributes to the spherical surface processing, such as not requiring a wide processing place and reducing the processing cost.

Further, by allowing the tool rest for holding the tool to move up and down by the gear mechanism, the position of the tool can be adjusted accurately and easily in accordance with the spherical machining diameter of the work, and The setup time is shortened, the fine adjustment is easy, the machining accuracy is improved, and it is not necessary to prepare many kinds of blades for each machining dimension.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a spherical surface processing machine according to the present invention.

FIG. 2 shows another embodiment of the spherical surface processing machine according to the present invention,
It is a longitudinal cross-sectional view of a tool post portion.

3 is a cross-sectional view of FIG.

FIG. 4 is a view showing a modified example of the tool post drive gear mechanism in the spherical surface processing machine of FIG. 2;

FIG. 5 is a diagram showing still another modification of the tool rest drive gear mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Worm gear 3 Outer shaft 4 Bearing tube 5 Turret 6 Tool post 7 Work 8 Inner shaft 9 Gear 10 Gear 11 Gear 12 Gear 13 Gear 13 Link mounting hardware 14 Link mechanism 21 Tool fixing bolt 22 Screw (male screw) 23 Screw (female screw) 24 Driven-side bevel gear 25 Drive-side bevel gear 26 Drive part 27 Groove 28 Non-rotating bolt 29 Tool post mount 30 Bush 31 Arm 32 pin 33 Fixed ring 34 Bush 41 Worm gear 42 Face gear 43 Worm 44 Screw (female screw) 45 Pinion 46 Drive unit 47 screw (female screw)

Claims (2)

[Claims] 1. A concentric two-axis rotating shaft composed of an outer shaft and an inner shaft, an electric motor for rotating the outer shaft via a worm gear, and a gear mechanism for rotating the inner shaft by the rotation of the outer shaft. And a tool rest having a tool, which is rotated by the rotation of the outer shaft, a link fitting that is screwed into the threaded portion of the inner shaft, and moves in the axial direction by the rotation of the inner shaft, and the link fitting. And a link mechanism for connecting the tool post to the tool post and moving the tool post in an arc direction by axial movement of the link mounting hardware. 2. The spherical surface processing machine according to claim 1, wherein the tool rest is a cylindrical tool rest having a screw part in a part thereof,
A spherical processing machine provided with a gear mechanism that is screwed into the threaded portion of the cylindrical tool rest to vertically move the tool rest.