JPH06701A - Method and device for processing container skirt - Google Patents

Abstract

(57) [Abstract] [Purpose] Highly reliable finishing for a container skirt processing method and device, even when the vicinity of the welded part is deformed or the dimensional accuracy varies. Is carried out efficiently and the strength of the welded portion is secured. [Structure] When processing the inner surface of the weld between the collar and the skirt-shaped tubular body, two inner surface positions sandwiching the weld are measured at multiple locations along the circumferential direction, and the two inner surface positions are measured. A machining line connecting the two is set based on the measurement data to develop the machining lines at multiple locations in the circumferential direction, and based on this machining surface, a cutting tool inserted between the container body and the skirt-shaped cylindrical body. The inner surface of the weld is cut by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for processing a container skirt.

[0002]

2. Description of the Related Art When a reactor pressure vessel is mounted on a support structure, a skirt-shaped tubular body with a downwardly widened portion is welded to the outer peripheral surface of the body of the reactor pressure vessel, and the skirt-shaped tubular body is attached to the reactor. A structure supported by a pedestal may be adopted.

Since a reactor pressure vessel is required to have pressure resistance, heat resistance, mechanical strength, etc., a structure for fitting with a skirt-shaped cylinder is important.

For example, at the time of manufacturing the body of the container, a structure in which a short skirt-shaped collar portion is formed integrally with the outer peripheral surface by a method such as forging, and a skirt-shaped cylinder is welded to the collar portion is adopted. It

Then, in order to confirm the soundness of the nuclear reactor, the welded portion between the collar portion and the skirt-shaped tubular body is
It is desirable to finish the inner and outer surfaces to be flat so that a nondestructive inspection such as ultrasonic flaw detection can be easily performed.

[0006]

However, the processing work on the inner surface side of the welded portion between the collar portion and the skirt-shaped tubular body is performed after the welding, that the inner side of the skirt-shaped tubular body becomes a narrowed portion, and the reactor pressure is reduced. The workability is significantly impaired because the body of the container becomes a large processed product, and the size of the joint between the flange and the skirt-shaped tubular body varies due to machining error or deformation.

The present invention effectively solves the problems of the prior art. In other words, the purpose is to efficiently perform highly reliable finishing even when the vicinity of the welded portion is deformed or the dimensional accuracy varies.

[0008]

The present invention proposes a method and an apparatus as means for achieving the above object. In the processing method of the container skirt portion, when processing the inner surface of the welded portion between the collar portion formed on the outer peripheral surface of the container body and the skirt-shaped tubular body, two inner surface positions sandwiching the welded portion are set. Based on the measurement data, the step of measuring at multiple points along the circumferential direction, the step of inserting the tip of the cutting tool between the container body and the skirt-shaped cylinder, and the machining line connecting the two inner surface positions. It is carried out by the step of setting and the step of cutting the inner surface of the welded portion along the processing surface that develops the processing lines at a plurality of locations in the circumferential direction. In a processing device for a container skirt part, a swivel table for loading a container and rotating it horizontally when processing an inner surface of a welded portion between a collar part formed on an outer peripheral surface of a container body part and a skirt-shaped tubular body. And a machining head for inserting a cutting tool between the body of the container mounted on the swivel table and the skirt-shaped cylindrical body, and a position for measuring two inner surface positions of the machining head sandwiching the welded portion. And a control unit that is connected to the position sensor and calculates a machining line that connects two inner surface positions, and controls the position of the cutting tool along a machining surface that develops the machining line in the circumferential direction. It is adopted.

[0009]

With respect to the inner surface of the welded portion between the collar portion and the skirt-shaped tubular body formed on the outer peripheral surface of the container body, the two inner surface positions of the collar portion and the skirt-shaped tubular body are It is measured at multiple points along the circumferential direction. A processing surface is set by setting a processing line connecting two inner surface positions based on the measurement data of these plural points and expanding the processing lines at the plural points in the circumferential direction. Insert the tip of the cutting tool between the container body and the skirt-shaped cylinder, and cut the inner surface of the weld along the set machining surface. Even if the circularity of the two inner surface positions is insufficient due to processing error or deformation, or if there is a processing error, cutting will proceed with the two inner surface positions as the practical reference points. The processing is performed while maintaining the thicknesses of the collar portion, the skirt-shaped tubular body, and the welded portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for processing a container skirt portion according to the present invention and an apparatus used for implementing the same will be described below with reference to FIGS. In each of these drawings, 1 is a container (container body), 2 is a collar part, 3 is a skirt-shaped cylindrical body, 4 is a welded part, 5 is a vertical lathe, 6 is a turning table, and 7 is a rotary table.
Is a machine body, 8 is a machining head, 9 is a cutting tool, 10 is a control unit, 11 is a turning position sensor, 12 is a radial position sensor,
Reference numeral 13 is a delivery position sensor, and 14A and 14B are measurement position sensors (position sensors).

The vessel (container body) 1 is a single body portion of the reactor pressure vessel in the examples of FIGS.
The outer peripheral surface of the skirt has a short skirt-shaped collar 2 formed by forging or the like.
Are integrally formed, and the skirt-shaped tubular body 3 is attached to the flange portion 2 by the welded portion 4. In the example of FIG.
The container body 1, the skirt-shaped cylinder 3 and the like are mounted on the turning table 6 in a state where the top and bottom are turned upside down. Then, as shown in FIG. 4, a backup ring 4a or the like which is inwardly projected by the welding operation is left on the inner surface of the welded portion 4 of the collar portion 2 and the skirt-shaped tubular body 3, and The protruding part etc. shall be cut.

In the vertical lathe 5, as shown in FIG.
A device main body 7, a processing head 8 for cutting a workpiece mounted on the turning table 6 and a cutting tool 9 are arranged, and a control unit for precisely controlling a cutting location by numerical control or the like. 10 and various position sensors for detecting the position of each part and performing control based on the position information.

The turning table 6 is provided with a drive motor and the like for horizontally turning the turning table 6, and a turning position sensor 11 such as a magnescale for detecting the turning amount and turning angle.

The device main body 7 has means for moving the machining head 8 in the radial direction and the feeding direction, and a radius of a magnetic scale for detecting the movement amount and position of the machining head 8 in the radial direction and the feeding direction. A position sensor 12 and a feeding position sensor 13 are arranged.

The machining head 8 has a drive source 8a, as shown in FIGS. 2 and 3, as means for moving the cutting tool 9 in the inner and outer directions (generally radial directions) orthogonal to the feeding direction. A rotational force transmission system 8b such as a bevel gear connected to the drive source 8a for transmitting rotational force, a ball nut connected to the rotational force transmission system 8b for converting rotational movement into the above-mentioned inward and outward movements, A rotary linear motion converting mechanism 8c including a linear guide, and a tool mounting portion 8d to which the cutting tool 9 and the measuring position sensors 14A and 14B are mounted with the rotary linear motion converting mechanism 8c interposed.
And are provided.

The control unit 10 has, as shown in FIG.
Each position data transmitter 10a connected to each position sensor 11, 12, 13, 14A, 14B, and an arithmetic unit such as a small computer connected to the position data transmitter 10a for comprehensively numerically controlling the vertical lathe 5. 10b and the arithmetic unit 10
A servo drive 10c for controlling the drive source 8a is provided.

The control method will be described below. As shown in FIG. 1, the container body 1, the skirt-shaped cylinder 3 and the like, which are turned upside down, are mounted on the swivel table 6, and the vertical lathe 5 is operated to operate the container body 1 and the collar. The machining head 8 is extended to a narrow portion between the welding portion 2 and the skirt-shaped tubular body 3, and the tool attachment portion 8d and the cutting tool 9 are set so as to be located near the inner surface of the welding portion 4. With these position settings, the position sensor 12 and 13 detect the position in the radial direction (TM ram X coordinate) and the position in the feeding direction (TM ram Z coordinate) in the machining head 8 and the cutting tool 9, and the detection data ( Each coordinate) is the position data transmitter 10
It is transmitted to and stored in the calculation unit 101b via a.

With the tip of the processing head 8 inserted in the narrow space, the container body 1 and the like are set so that they can be horizontally swung while maintaining the non-contact state with the processing head 8 and the cutting tool 9 The precise position adjustment in the radial direction is performed by the servo drive 10c by operating the drive source 8a, the rotary linear motion converting mechanism 8c, and the like.

The tip of the processing head 8 is located at two positions on the inner surface of the welded portion 4, that is, at any two inner surface positions (position A and position B) sandwiching the welded portion 4 as shown in FIG. Is set, and the position (u-axis position) of the cutting tool 9 in the direction orthogonal to the feeding direction is two position sensors 14
The detected data is detected by A and 14B, and the detected data is transmitted to the arithmetic unit 101b via the position data transmitter 10a and stored therein. Similarly, the coordinates of the two inner surface positions are measured at a plurality of points along the circumferential direction and are stored in the control unit 10.

As a result of detecting these two positions, the inner surfaces of the collar portion 2 and the skirt-shaped cylindrical body 3 that sandwich the welded portion 4 are
Even if there is a slight deviation in the radial direction from the reference value, or if there is a slight variation in the circumferential direction, the two inner surface positions are digitized by the operation of the control unit 10. Then, as shown in FIG. 4, a machining line C connecting the two inner surface positions is calculated, and similarly, machining lines C at a plurality of locations are calculated.
The machined surface in a continuous state that is developed in the circumferential direction is set, and cutting is performed up to this machined surface. The number of calculated machining lines in this case can be set according to the resolution of the turning position sensor 11. For example, when there is a resolution of about 0.1 mm along the circumferential direction, the machined surface is very smooth. Will be things.

Further, even when the joint between the collar portion 2 and the skirt-shaped cylindrical body 3 has an error or deformation at the time of processing and the roundness of the two inner surface positions is insufficient, If the inner surface of the welded portion 4 between the two inner surface positions is cut, the cutting is performed in a state where the two inner surface positions are averaged. Therefore, the cutting amount of the inner surface of the welded portion 4 is excessive. A shortage is less likely to occur, and it becomes easy to secure the strength of the welded portion 4. Moreover, cutting workability is remarkably improved by measuring the positions of the two inner surfaces and setting these as the reference points for practical use.

[0022]

As described above, according to the container skirt portion processing method and apparatus according to the present invention, when the inner surface of the welded portion between the collar portion and the skirt-shaped tubular body is processed, Measure two inner surface positions sandwiching the weld along the circumferential direction at multiple points, set the processing line connecting the two inner surface positions based on the measurement data, and develop the processing lines at multiple points in the circumferential direction. At the same time, the inner surface of the welded portion is cut by the cutting tool inserted between the container body and the skirt-shaped tubular body on the basis of this processed surface. (1) Even if the skirt part and the vicinity of the welded part are deformed or the dimensional accuracy such as roundness varies, it is possible to efficiently perform highly reliable finishing work. it can. (2) By performing cutting with a machining line connecting two inner surface positions as a reference, the amount of cutting on the inner surface of the welded portion does not become excessive or insufficient, and the strength of the welded portion can be secured.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an example of an apparatus for carrying out a method for processing a container skirt portion according to the present invention.

FIG. 2 is a front view of a processing head portion in the apparatus of FIG.

FIG. 3 is a side view of a processing head portion in the apparatus of FIG.

FIG. 4 is an enlarged cross-sectional view showing how the position of the container skirt of FIG. 1 is detected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container (container body part) 2 Collar part 3 Skirt cylinder 4 Welding part 4a Backup ring 5 Vertical lathe 6 Turning table 7 Equipment body 8 Processing head 8a Drive source 8b Rotational force transmission system 8c Rotation linear movement conversion mechanism 8d Tool mounting Part 9 Cutting tool 10 Control part 10a Position data transmitter 10b Arithmetic part 10c Servo drive 11 Turning position sensor 12 Radius position sensor 13 Feeding position sensor 14A, 14B Measurement position sensor (position sensor)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G21C 13/024

Claims (2)

[Claims] 1. A method for processing an inner surface of a welded portion between a collar portion formed on an outer peripheral surface of a container body and a skirt-shaped tubular body, wherein two inner surface positions sandwiching the welded portion are surrounded. A step of measuring at multiple points along the direction, a step of inserting the tip of a cutting tool between the container body and the skirt-shaped cylinder, and a machining line connecting the two inner surface positions are set based on the measurement data. And a step of cutting the inner surface of the welded portion along a processing surface that develops a plurality of processing lines in the circumferential direction, and a method for processing a container skirt portion. 2. A device for processing an inner surface of a welded portion between a collar portion formed on an outer peripheral surface of a container body and a skirt-shaped cylindrical body, wherein the container has a turning table for horizontally rotating the container. A machining head that inserts a cutting tool between the body of the container mounted on the swivel table and the skirt-shaped cylinder, and position sensors that measure the positions of two inner surfaces of the machining head that sandwich the welding portion And a control unit that is connected to the position sensor, calculates a machining line that connects two inner surface positions, and controls the position of the cutting tool along a machining surface that develops the machining line in the circumferential direction. Equipment for processing container skirts.