JP5045141B2 - Stub welding monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a welding by which the degree in the inclination of a stub upon welding is securely detected, and the deviation of a base line is minimized. <P>SOLUTION: The stub welding monitoring apparatus, by which the welding point W at the edge face of a fixedly supported consumption electrode 1 is matched with the central shaft C of a standing stub 2, and the lower edge face thereof is welded, is provided with: an X-Y table 4 movably holding the upper edge of the stub 2 in the horizontal plane; encoders 41, 42 detecting the moving position at the upper edge of the stub 2; and a display monitor 6 displaying the moving position at the upper edge of the stub 2 during welding. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a stub welding monitoring device, and more particularly to a stub welding monitoring device for monitoring a change in posture of a stub when the stub is welded to a consumable electrode in vacuum arc remelting or the like.

In vacuum arc remelting, electroslag remelting, etc., the consumable electrode is suspended in a water-cooled mold provided in the remelting furnace. The upper end of the stub is gripped by the stub clamp. Patent Document 1 discloses a spherical centering bearing provided so that the posture of the consumable electrode can be adjusted by swinging in the mold.
JP 6-38031

   By the way, in order to prevent roughening and segregation of the ingot due to uneven distribution of the vacuum arc and temperature distribution of the molten slag, the side between the outer periphery of the consumable electrode suspended in the cylindrical mold and the inner periphery of the mold is used. It is necessary to make the gap uniform over the entire circumference. Therefore, Japanese Patent Application No. 2005-262213 proposes a method for determining a stub welding point for maintaining a side gap substantially evenly with respect to a consumable electrode curved in the longitudinal direction.

   According to this method, the welding position of the lower end of the stub to the upper end surface of the consumable electrode can be reliably determined and welded. However, according to experiments by the inventors, the stub is placed on the consumable electrode due to welding distortion during welding. Since it is inclined with respect to the end face, there is a problem that the core is displaced from the consumable electrode through the stub and the uniformity of the side gap is lost. Therefore, the operator changes the welding direction as appropriate to minimize the inclination of the stub, but there is a problem that there is no certainty because the inclination posture is monitored visually.

  The present invention solves such problems, and enables welding that reliably detects the degree of inclination of the stub during welding and minimizes misalignment of the core, thereby reducing the side gap around the consumable electrode. An object of the present invention is to provide a stub welding monitoring device that can be made uniform.

  In order to achieve the above object, according to the first aspect of the present invention, the center axis (C) of the standing stub (2) is aligned with the welding point (W) of the end face of the consumable electrode (1) fixedly supported. A stub welding monitoring device for welding a lower end surface, a holding means (4) for holding the upper end of the stub (2) so as to be movable in a horizontal plane, and a position detecting means for detecting a moving position of the upper end of the stub (2) (41, 42) and display means (6) for displaying the moving position of the upper end of the stub (2) during welding.

  In the first invention, when the operator welds the lower end of the stub to the welding point, the stub rotates and tilts around the welding point according to the welding direction due to welding distortion at this time. The upper end of the stub moves in the horizontal plane in accordance with the amount of inclination of the stub, and the movement position is detected by the position detection means. Since the detected moving position is displayed by the display means, the operator can perform welding while changing the welding direction while checking the moving position, thereby suppressing the inclination of the stub and minimizing the deviation of the core. Can do.

  In this 2nd invention, the said display means (6) displays the said movement position on the secondary coordinate centering on the said welding point (W). In the second aspect of the invention, since the moving direction of the stub upper end, that is, the inclination direction of the stub can be known with certainty, the welding direction can be changed more smoothly.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

   As described above, according to the stub welding monitoring device of the present invention, since welding that minimizes the deviation of the core is possible by reliably detecting the degree of inclination of the stub during welding, The side gap around the consumable electrode can be made uniform, and the roughening and segregation of the remelted ingot can be effectively prevented.

  FIG. 1 shows the configuration of a stub welding monitoring device. In FIG. 1, the consumable electrode 1 is held in a predetermined standing posture by a holding mechanism or the like, and the W point on the upper surface thereof is, for example, a stub welding point determined by the method disclosed in Japanese Patent Application No. 2005-262213. ing. The rod-like stub 2 is held in a suspended state by a stub clamp (not shown) having a known structure provided in the stub clamp device 3 constituting the holding means.

  The stub clamp device 3 is supported by an XY table 4 that constitutes a holding unit, and is movable in a horizontal plane. The movement position of the upper end of the stub clamp device 3, that is, the stub 2 held by the stub clamp device 3, is an encoder in the X direction (direction perpendicular to the paper surface) and Y direction (direction parallel to the paper surface) attached to the XY table 4. 41, 42. The detected position of the upper end of the stub 2 is input to the processing device 5 having a CPU.

  The XY table 4 is driven by an output from the processing device 5. This XY table 4 is fixed to a support base (not shown), and can move up and down and swivel toward a water-cooling mold (not shown) of a remelting furnace. A display monitor 6 is provided at a position where the worker M can visually recognize the display monitor 6. The display monitor 6 is connected to the processing device 5, and a display as described later is made on the display monitor 6 by an output signal from the processing device 5. .

  In the stub welding monitoring device having such a configuration, the upper end of the standing stub 2 is held by the stub clamp device 3 supported by the XY table 4 that is swung on the consumable electrode 1 and is determined in advance. The stub 2 is moved by the XY table 4 while detecting the movement position by the encoders 41 and 42 so as to be positioned immediately above the stub welding point W on the upper end surface of the consumable electrode 1.

  The XY table 4 and the stub 2 that have reached directly above the stub welding point W are lowered, the center axis C of the standing stub 2 is made to coincide with the stub welding point W, and the lower end surface of the stub 2 comes into contact therewith. Be made. Next, the operator welds the lower end of the stub 2 to the welding point W (the state shown in FIG. 1). The stub 2 rotates around the welding point W on the upper end surface of the consumable electrode 1 according to the welding direction due to welding distortion. It is inclined dynamically (arrow in FIG. 1).

  Since the upper end of the stub 2 and the stub clamp device 3 that holds the stub 2 move in the horizontal plane according to the amount of inclination of the stub 2 at this time, this movement is detected by the encoders 41 and 42 of the XY table. The processing device 5 inputs position signals from the encoders 41 and 42 at regular intervals (for example, 2 seconds), and displays the moving position of the upper end of the stub 2 on the display monitor 6. An example of the display is shown in FIG.

  On the display monitor 6, an XY coordinate centered on the stub weld point W and a circular range having a predetermined diameter centered on the stub weld point W are displayed as an allowable range R by the processing device 5. Then, the sequentially detected movement position of the upper end of the stub 2 is displayed on the XY coordinates by circles P1, P2, P3. That is, when the movement position is within the allowable range R, for example, a light blue circle P1 is displayed, and when the movement position is out of the allowable range R, a red circle P2 is displayed, and the current movement position is a slightly larger green circle P3. Is displayed.

  The worker M changes the welding direction as appropriate so that the movement position of the upper end of the stub 2 always falls within the allowable range R by performing welding while visually checking the monitor display. Thus, since the moving position of the upper end of the stub 2 during welding, that is, the degree of inclination of the stub 2 is displayed on the display monitor 6, the operator changes the welding direction while checking this, Deviation can be minimized.

  After the welding is completed, the consumable electrode 1 welded to and integrated with the stub 2 is swung onto the water-cooled mold of the remelting furnace and then lowered into the water-cooled mold. In addition, the x mark in the monitor display indicates a mechanical core passing through the mold center.

It is a block diagram which shows the structure of a stub welding monitoring apparatus. It is a front view of the display screen of a display monitor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Consumable electrode, 2 ... Stub, 3 ... Stub clamp apparatus (holding means), 4 ... XY table (holding means), 41, 42 ... Encoder (position detection means), 6 ... Display monitor (display means), C: central axis, W: welding point.

Claims (2)

A stub welding monitoring device that welds the lower end surface of the stub with the center axis of the standing stub aligned with the welding point of the end face of the fixedly supported consumable electrode, and holds the upper end of the stub so as to be movable in a horizontal plane. Stub welding monitoring apparatus comprising: holding means; position detecting means for detecting the moving position of the stub upper end; and display means for displaying the moving position of the stub upper end during welding. The stub welding monitoring apparatus according to claim 1, wherein the display means displays the movement position on an XY coordinate centered on the welding point.

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