JPS6199581A - Feeding instrument of filler wire - Google Patents

Abstract

PURPOSE:To enable an automatic welding without interfering with the wall of a bevelling even in case of a complicated welding bevelling by controlling all the times the rotation of the wire feeding means so as to locate it in the contact line direction of the curved line like bevelling. CONSTITUTION:The curvilinear coordinates or equation of the weld bevelling 1 is stored in advance corresponding to the running distance on the memory part of the controlling circuit 27 of a direction controlling means 19. On starting the welding work the roller 9 of one end of the arm 8 being fitted to the truck 5 is moved along the lateral profiling template 10 with the movement of the truck 5 on a travelling rail 4. As a result the welding torch 13 being fitted to this other end with the horizontal movement of the arm 8 to the right and left is moved along the curved line of the weld bevelling 1. On the other hand the filler wire 16 rolled out of a wire reel 17 is guided inside the wire guide of a wire feeding means, fed for the weld bevelling 1 of the tip part of the torch 13 and the welding is performed in order. The wire guide is freely rotatable at the prescribed angle in a horizontal direction and the direction is controlled so as to become in the contact line direction of the curved line.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a filler wire supply device attached to an automatic welding device, and particularly relates to a filler wire supply device whose curvature changes? ! The present invention relates to a supply position of a filler wire V which can supply a filler wire even in a curved groove having a curved groove of 221i while avoiding interference between the wall of the groove and a wire feeding means.

[Prior art 1] Generally, as a device for welding a curved welding groove where the curvature changes midway, a welding torch is extended from a trolley that moves on a running rail that is laid along the welding groove; , automatic welding that moves the torch in a curve along the welding groove while performing this horizontal movement using a left-right tracing template, and adjusts the position in the vertical direction by arc length control.
location is already known.

This welding device includes a wire reel on which the necessary pieces of filler wire are wound and attached to the trolley, and a wire reel fixed to the torch side to feed the filler wire unwound from the reel to the groove at the tip of the torch. A filler wire supply device consisting of a wire feeding means is attached, and the filler wire A7 is fed while the welding torch is moved along the welding groove to perform continuous welding.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional supply device, when the curve drawn by the welding groove is a gentle curve whose curvature is not very large, the advancing direction of the filler wire is not constant. To stably feed the filler wire into the groove without interference between the wall of the groove and the wire supply means (specifically, the wire guide that guides the wire into the groove) can be done, so there will be no problem. However, the curvature of the welding groove is large and the curvature changes midway. ! 2. If the curve is rough, the wire supply means can melt 1 m as in the conventional device.
If it was fixed to the equipment side, the wall of the groove would interfere with the wire guide in areas with large curvature, making it impossible to feed the wire to the specified position and making welding impossible. .

Therefore, in the conventional feeding device, the curve -t
It can only be used for welding grooves that are below a certain value, and cannot be applied to complex curved welding grooves that have a large curvature and the curvature changes midway.

[Object of the Invention] The present invention has been developed in order to focus on the above-mentioned problems and to effectively solve them.

The object of the present invention is to constantly control the rotation of the wire feeding means so that it is positioned in the tangential direction of the curved groove,
Even if it is a complicated welding groove with a large curvature 1;;)
To provide a filler wire feeding device which enables automatic welding without interfering with the previous wall.

[Summary of the Invention] To achieve the above object, the present invention provides a wire feeding means including a wire guide on a welding torch side so as to be rotatable around the welding torch as its center of rotation, and a A direction control means for positioning the wire in the tangential direction of the curved groove is provided, and the direction of the wire feeding means is constantly controlled by the control vO means so that the wire feeding means is positioned in the tangential direction of the curved groove. The gist is to avoid interference with the wall ahead.

(Example) Hereinafter, preferred embodiments and implementations of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a plan view showing a welding apparatus equipped with a filler wire supply device according to the present invention, and FIG. 2 is a sectional view taken along the line ff-Ir in FIG.

As shown in the figure, 1 is a welding groove whose curvature changes greatly in the middle and follows a ml curve, and a running rail 4 on which a rack 3 is formed is laid on this groove to allow the automatic welding machine 2 to run. has been done. This automatic welding machine 2 is, for example, a TIG
Welding is now being carried out. The automatic welding machine 2 has a truck 5 that moves along a running rail 4, and is moved using a truck motor 6 attached to the truck as a driving source.

An arm 8 is attached to this cart 5 and is horizontally movable in the direction of the welding groove 1 by a copying motor 7. A roller 9 provided at one end of the arm 8 is aligned with the curve of the welding groove 1. The other end of the arm 8 is moved along the curve of the welding groove by moving it along the measurement surface of the left and right copying template 10 which is formed into the same curved shape.

Note that the length of the arm 8 is made to match the horizontal distance between the template 10 and the welding groove 1.

A TIG welding torch 13 is vertically attached to the extending end of the arm 8 via a bracket 11 and a mounting base 12, and the mounting base 12 is connected to a vertical adjuster including a motor. 14, the white stone moves upward and downward as appropriate.

As shown in FIGS. 3 and 4, a filler wire supply device W115 according to the present invention is attached to such a conventionally known welding apparatus.

FIG. 3 is a longitudinal cross-sectional view showing the main part of the present invention, and FIG. 4 is a plan view thereof.

As shown in the figure, this feeding device 15 includes a wire reel 17 on which a filler wire 16 is wound around five sides and is rotatably attached to a trolley 5, and a wire reel 17 that is unwound from the wire reel 17.
A wire feeding means 18 for feeding 6 to the i8 joint at the tip of the front 21 to 13, and a wire feeding means 18 for appropriately rotating and moving this feeding means 18 to avoid interference with the wall of the groove. It is composed of one direction control means.

Specifically, the wire feeding means 18 described in - is connected to the tip 9i;
a hollow cylindrical wire guide 20 which is directed toward the tip of the welding torch 13 and guides the filler wire 16 through the welding torch 13; The wire feeder 21 feeds the filler wire 16 toward the distal end of the wire guide 20 by a motor (not shown).

Here, the vl of the wire guide 20 and the groove during welding
In order to avoid interference with the torch 13, in the present invention, the entire wire feeding means 18 is made horizontally rotatable about the torch 13. That is, the torch 13 is connected to a hollow cylindrical gear body 24, which has teeth 22 on a portion of its periphery and is rotatably supported on the mounting base 12 via a radial ball bearing 23, through a collet 25. The torch 13 itself is freely rotatable. And (−′l″:
a −t"W 't'y'< 24 h"3 t m
The wire feeder 21 is attached to the wire feeder 26, so that by rotating the gear body 24, not only the gear body 13 itself rotates, but also the wire feeder rz i a sit. --They rotate integrally in the horizontal direction by a predetermined angle around the center 13.

It is desirable that the rotational operation chromaticity 0 of the wire feeding means 18 be set in accordance with the curve of the welding groove curve ≦r. The moving angle of this wire feeding means 18 is controlled by the ail control means 19.

Furthermore, this direction υI 1111 means 1II is attached to the trolley 5 and outputs an angle signal to be rotated.
An I control circuit 27 (see Figure 1), a potentiometer 28 provided in the J stand 12, and a potentiometer 28 provided in the mounting stand 12 to output the driving force to rotate the first wire feed stage 18. It mainly consists of two angle adjustment motors.

Specifically, 1. Drive shaft 29 of the angle adjustment motor 29
A pinion 30 is attached to the pinion 30, and an idle gear 31 that meshes with the 32nd tooth 22 formed on a part of the gear l body 24 is meshed with the pinion 30. Therefore, the motor 29 is rotated appropriately. As a result, this rotational force can be transmitted through the idle gear 31 to the wire feeding means 18 side.

Further, a potentiometer gear 32 is meshed with the onion 30, and the potentiometer 28 also rotates in conjunction with this rotation.

Then, the angle is adjusted by driving the motor 29 until the output voltage from the potentiometer 28 and the command voltage as the angle signal become equal. The block diagram of this direction control means will be further explained based on FIG. 27b stores the travel distance signal a inputted from the side of the truck motor 6 that drives the automatic welding machine in the storage section 27.
The current position is determined by making it correspond to a, and a legal formula for the tangent to the curve is determined, and the position is converted into voltage as an angle signal and output as a command voltage. Then, the comparator 27c compares this command voltage C with the output voltage C from the potentiometer 28 side, and drives the motor 29 for angle A until the two values become the same. Note that this potentiometer 28 is set in advance so that the angle of the wire guide 20 of the first stage 18 of the wire feeding means corresponds to the output voltage. Further, a step motor shade may be used for the direction control means 19 instead of the potentiometer 28 as described above, and in any case, the angle of the wire guide 20 is set to the same angle as the slope of the tangent equation input by the tJ expression part 27b. There is no way to do this if it is possible to control the

Next, a detailed explanation of the present invention will be given below. First, the storage unit 27a of the 1tll-0 circuit 27 of the direction fighter r219 stores in advance the equations (7 to 7) of the curve of the welding groove 1 in correspondence with the traveling N1.

Then, after 6 steps of welding work, the platform U on the traveling rail 4!
While the arm 8 is moving, one end of the arm 8 attached to the roller 9 moves along the left-hand copying template 10, and as a result, the arm 8 moves horizontally from side to side. The girder welding torch 13 is attached to the curve of the welding groove 1)r>
You will have to move.

On the other hand, the filler wire 1 taken out from the Soi N frill 17 or 65
After being guided through the wire guide 20 of the wire feeding means 18, the wire 6 is fed toward the welding groove 1 at the tip of the welding torch 13, and welding is performed in sequence.

Note that the elevation angle α of the wire guide 20 is maintained at approximately 30 to 40 degrees.

Here, when the curvature of the curve of the welding groove 1 becomes large, the wire guide 20 moves g! However, in the present invention, the wire guide 20 can be turned horizontally by a predetermined angle (approximately 30 degrees), and its direction is always υ1t11 so that it is tangential to the curve. , the wire guide 20 never hits the wall 1a of the groove.

That is, as shown in FIG.
A travel distance signal a is inputted to b from the bogie motor side, and the calculation section 27b calculates <3c! based on this signal. tc
H1127°“owso”t,,,ibmt*ic,t
> Find the tangent to the curve of the welding groove 1 and compare the slope of this tangent with the command voltage as the angle a signal 527
Output to c. Then, the comparator 27c outputs the drive signal of the angle adjusting motor 29 until the output voltage C of the potentiometer inputted from the potentiometer 28IIllI becomes equal to the command voltage. When the angle adjustment motor 29 is driven as shown in FIG.
At the same time, the wire feeding means 18 fixed to the gear body 24 is rotated by a predetermined angle, and the wire guide 20 is rotated. It is the same as the tangent direction to the welding point. At this time, the potentiometer 2 is connected via the potentio gear 32 meshed with the pinion 30.
8 is also interlocked, and the output voltage C from now on will gradually change. As described above, when this output voltage C becomes equal to the command voltage from the operating section 27b, the drive of the angle vI4I4 upper motor is stopped and the wire guide 20 is stopped at a position where it is the same as the tangential direction. do.

Since such control is constantly performed during welding work, the direction of the wire guide 20 is always controlled so that it is tangential to the curve even if the curvature of the curve changes significantly.

Therefore, the wire guide 20 does not interfere with the groove wall 1a, and the filler wire 16 can be stably supplied at all times.

In the above embodiment, the torch 13 is also rotated in order to rotate the wire feeding means 18, but
The present invention is not limited to this, and only the wire feeding means 18 may be rotated.

[Effects of the Invention] In short, according to the present invention, the following effects can be achieved.

(1) The direction of the wire guide of the wire feeding means can be constantly controlled so that it is tangential to the curve of the welding groove.

(2) Therefore, in the past, in order to avoid interference of the wire guide with the groove wall, it was possible to weld only grooves whose curvature was within a predetermined range, but according to the present invention, it is possible to weld only grooves whose curvature changes midway. Even with a welding groove curve, it is possible to avoid interference of the wire guide with the groove wall, making it possible to feed the filler wire, and this FI! It is possible to perform groove contact between welds.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a welding apparatus equipped with a filler wire supply device according to the present invention, Fig. 2 is a sectional view taken along the If-[arrow in Fig. 1, and Fig. 3 shows main parts of the present invention. 4 is a plan view thereof, and FIG. 5 is a block diagram showing the direction III 1211 means of the present invention. In addition, in the figure, 1 is a welding groove, 1a is a hard part, 2 is an automatic welding machine,
4 is a running rail, 1o is a left and right copying template, 13 is a welding torch, 17 is a wire reel, 18 is a wire feeding means, and 19 is a direction control means. Patent Applicant: Ishikawajima 111i Heavy Industry Co., Ltd. Representative Patent Attorney: Nobuo Kinutani Figure 1 7 Hoo-hui Y reel

Claims (1)

[Claims] A welding device that performs welding with a welding torch facing the welding groove while moving on a traveling rail laid along a curved welding groove, a wire reel wound with filler wire, and the welding device described above. A wire feeding means, which is rotatably provided on the apparatus side with the welding torch as a rotation center, and feeds the filler wire unwound from the wire reel to the welding groove at the tip of the torch, and the wire feeding means. A supplying device for a welding wire, comprising: direction control means for rotating the means to position the means in a tangential direction of the curved groove so as to avoid interference with the wall of the groove.