JP3345868B2 - Flash welding equipment for welding two members being transported - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash welding device for welding two members to be welded during transportation.

[0002]

2. Description of the Related Art In flash welding, as is well known, two members to be welded are gripped by respective electrodes, end faces of the members to be welded are pressed against each other, a large current flows between the electrodes, and a local portion of the end surface is formed. At the contact points, heat is concentrated and melted, sparks are scattered, and one electrode is moved toward the other electrode so that the end faces are in close contact with each other,
Repeat the spark. After the end faces are sufficiently heated, they are pressed together, thus welding the entire end faces.

When a plurality of members are integrally rolled, in the case of the above-mentioned flash welding, after a plurality of members to be welded are welded one after another, they are brought to a separately prepared rolling facility. Rolling.

[0004]

However, when a plurality of members to be welded are integrated by flash welding and then rolled as described above, the flash welding and the rolling are performed completely independently of each other. There are some problems. First, the flash-welded member must be moved from the position of the welding equipment to the position of the rolling equipment by some means and set at a predetermined position for rolling, so that the efficiency is not good because it is not a continuous operation. Also, when the members to be welded are successively made, for example, by continuous casting, the members to be cooled are cooled before being brought to the rolling equipment, and must be heated again to a predetermined temperature by the heating equipment. , Large heat loss.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a highly efficient flash welding apparatus capable of continuous operation, and in particular, capable of flashing a workpiece to be welded by continuous casting as a continuous process even during transportation. .

[0006]

SUMMARY OF THE INVENTION According to the present invention, a conveying means for conveying a member to be welded, a movable welding carriage provided with electrodes for performing flash welding, and a position detecting means provided on the welding carriage. Speed detecting means for detecting the conveying speed, contact detecting means for detecting contact at the end faces of the two members to be welded, and control means.

A member to be welded is composed of a preceding member running on one route and a following member following the preceding member. The preceding member is
For example, in a member to be rolled from the tip side, the following member is to be welded to the member to be rolled at a predetermined interval,
The conveying member is conveyed at a speed higher than the rear end (unrolled portion) of the preceding member.

[0008] The welding cart is movable along the above-mentioned path, and has a front electrode and a rear electrode for flash welding which respectively hold the rear part of the preceding member and the front part of the following member. The welding cart is provided with position detecting means behind the front electrode. The position detecting means has a detecting element for detecting the end of the member to be welded at at least two positions before and after. On the other hand, at a position behind the position detecting means, a speed detecting means for detecting a conveying speed of the following member is provided.

Further, in the present invention, there is provided contact detection means for detecting that the following member has contacted the preceding member.

According to the present invention, the leading member is gripped by the front electrode at a predetermined position based on the signals from the position detecting means and the speed detecting means in accordance with a command from the control means, and then the following member is decelerated. The speed of the welding cart, the timing of gripping the electrodes, and the transport speed of the transport means are controlled so that the trailing electrode grips the trailing member when the trailing member contacts the preceding member.

More specifically, the control means causes the stopped welding bogie to travel forward at a speed lower than the traveling speed of the preceding member based on a rear end detection signal of the preceding member by the rear detecting element, and When the trailing end of the preceding member is detected or immediately after that, the leading member is gripped by the front electrode, and the welding trolley is placed in the running state at the same speed as the leading member, and the leading end detection signal of the trailing member by the backward detecting element Based on the detection signal of the abutment detection means, grip the following member based on the detection signal of the contact detection means, while adjusting the conveyance means based on the detection signal of the contact detection means while measuring the conveyance speed with the speed detection means. After the flash welding, the gripping of the front electrode and the rear electrode is released, and the welding cart is retracted to the original position.

The contact detecting means may be an acceleration detecting element attached to the front electrode gripping the preceding member and detecting that a trailing member collides with the rear end of the preceding member. It may be a speed detecting element that detects that the speed of the following member has become the same.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a roller conveyor as a conveying device, which is supplied from a heating device or a continuous casting device 2 to a predetermined high temperature suitable for rolling, for example, 800 to 800.
The member to be welded A sent out at a temperature in the range of 1000 ° C. is conveyed one after another in the direction of arrow B. The transfer device 1 is not limited to the illustrated roller conveyor, but may be of another type as long as it can withstand the high temperature, such as a chain conveyor.

A speed detecting device 3 for detecting a conveying speed of the member A to be conveyed is disposed above the conveying device 1. The speed detection device 3 can be either a contact type or a non-contact type with respect to the member A to be welded. For example, the speed detection device 3 can calculate a transport speed from a radius and the number of rotations as a contact roller.

A welding carriage 4 is provided in front of the transfer device 1 so as to be movable on a rail 5 in the transfer direction.
The welding cart 4 is configured so that the member A to be welded can travel therethrough.
A front electrode 6 and a rear electrode 7 for gripping the first member and the following member A2 and flash-welding the two members are provided. The electrodes 6 and 7 respectively hold and release the members A1 and A2 to be welded at predetermined times by driving means such as a cylinder (not shown), and receive electric power at predetermined times from a power supply transformer (not shown). .
A contact detection element 10 is attached to the front electrode 6. The contact detection element 10 detects that the front end of the following member A2 has contacted the rear end of the preceding member A1. In the case of this example, the contact detection element 10 is an acceleration detector that detects a collision between the two members A1 and A2 or A vibration detector or the like can be adopted.

On the welding cart 4, a front detecting element 8 is provided at a plurality of positions behind the front electrode 6, in the illustrated example, between the front electrode 6 and the rear electrode 7, and a rear detecting element is provided at the rear of the welding cart 4. Element 9 is mounted, and both detection elements 8,
Reference numeral 9 constitutes a position detecting device. The detection elements 8, 9
Detects the ends of the leading member A1 and the trailing member A2, which are the members to be welded, and may be a contact type or a non-contact type, but is a non-contact type in consideration of a high temperature of a detection target. Preferably, a photoelectric type, an electromagnetic type, a fluid pressure type, or the like can be adopted. In this case, at the front end and the rear end of the member to be welded, signals from the detection elements 8 and 9 are turned ON / OFF or OF.
Since there is a different change of F / ON, it can be clearly determined whether the signal has detected the front end or the rear end.

The apparatus of this embodiment has a control unit (not shown) other than those described above, and includes a speed detecting device 3, both detecting elements 8, 9 of a position detecting device, and a contact detecting element 10.
The control unit controls the transport device 1, the electrodes 6, 7, the welding cart 4, and a power supply transformer (not shown) based on the signal from the control unit. The contents of this control will be clarified in the operation procedure of the present example device described below.

First, in FIG. 2A, the welding trolley 4 is stopped, and the front electrode 6 or the rear electrode 7 is in a released state. The preceding member A1, which is the member to be welded, runs so as to penetrate the welding cart 4, and in the illustrated example, is rolled from the tip (not shown) of the preceding member A1. Therefore, the leading end of the preceding member A1 is traveling at a high speed, but the rear end, that is, the welding bogie 4
Portion located within the running than a small speed V _1. The trailing edge of the preceding element A1 which runs at a speed V ₁ is detected by the rear detection element 9.

When the rear detection element 9 detects the rear end of the preceding member A1, the welding device 4 is controlled by the control device on the basis of this signal so that the speed of the welding bogie 4 is slightly lower than the above speed, for example, V = 0.90 to 0.95V _1. It is made to run forward at the speed. The speed V of the welding carriage 4 is the speed V of the preceding member A1.
₁ is relatively slower than the preceding member A1.
Then, the front end of the preceding member A1 is detected by the front detection element 8 (see FIG. 2B).

A little after the generation of the signal of the front detection element 8, the front electrode 6 grips the preceding member A 1 according to a command from the control device (see FIG. 2C). at this point,
Welding vehicle 4 is controlled such that the speed is the same as the velocity V ₁ of the preceding element A1, or become free prior member A
1 causes the vehicle to be towed at the speed V.

[0022] The preceding member A1 front electrode 6 is gripped, welding vehicle 4 as described above is also moved at the same speed V ₁ and the preceding member A1, then the trailing member A2 is conveyed so as to follow the welding vehicle 4 You. Conveying speed V ₂ of this Kogyo member A2 is greater than the speed V ₁ of the preceding element, for example, V ₂ = (. 2 to
3) × V ₁ . Therefore, the trailing member A2 catches up with the welding cart 4, and the front end is detected by the rear detection element 9 (see FIG. 2D).

When the front end is detected by the rear detecting element 9, the transporting device 1 receives a command from the control device and reduces the transporting speed to about V ₂ = (1.1 to 1.2) × V _1. The following member A2 is conveyed at the speed shown in FIG. However, since the speed V ₂ of the Kogyo member A2 is still slightly larger than the velocity V ₁ of the preceding element A1, I approach gradually to the preceding member A1, eventually trailing member A2 impinges the preceding member A1. Due to this collision, the contact detection element 10 detects the contact between the two members. At this point, the trailing member A2 is gripped by the rear electrode 7 (see FIG. 2).
(F)). When the trailing member A2 is gripped by the rear electrode 7, the speed V ₂ of the trailing member A2 is controlled to be equal to the speed V ₁ of the preceding element A1.

Thus, the members to be welded A1 and A2 gripped by the electrodes 6 and 7 at predetermined intervals during traveling are:
In the traveling welding cart 4, similarly to normal flash welding, the ends are brought into contact with each other under the relative movement of the two electrodes 6 and 7, and the welding is performed by receiving the supply of electric current.

After the end of the flash welding, the two electrodes 6
7 is released, and the welding cart 4 is returned to its original position (FIG. 2A).
), The following member A2 then becomes the preceding member, and is welded to the next following member.

In this embodiment, the contact detecting element 10 is an accelerometer for detecting a collision. However, the present invention is not limited to this. In the above description, the fact that the following member A2 has the same speed as the preceding member A1 means that both members have the same speed. Because it is nothing but contact
By detecting this, a grip command may be given to the rear electrode 7.
That is, it is possible to detect that the speed of the following member A2 becomes equal to the speed of the preceding member A1 by using the speed detecting device 3 shown in FIG.

[0027]

As described above, according to the present invention, since the preceding member and the following member can be flash-welded while both are running, a series of continuous operations can be performed. Particularly, a heating device or a continuous casting device can be used one after another. Can be flash-welded without reheating the workpiece to be sent out at a high temperature, and the efficiency is extremely improved, and the heat loss can be suppressed to a small level. In particular, when the preceding member is in the rolling process, the effect is large.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a device of the present invention.

FIG. 2 is a view showing steps (A) to (F) up to flash welding in the apparatus shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveying means (conveying apparatus) 3 Speed detecting means (speed detecting apparatus) 4 Welding trolley 6 Front electrode 7 Rear electrode 8 Position detecting means (front detecting element) 9 Position detecting means (rear detecting element) 10 Contact detecting element (acceleration) A, A1, A2 Member to be welded A1 Member to be welded (leading member) A2 Member to be welded (member following)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 11/04 B23K 11/24 B21B 15/00

Claims (4)

(57) [Claims] An apparatus for performing flash welding by holding two members to be welded with electrodes and abutting the end surfaces of the members to be welded with each other. A transporting means for transporting the subsequent member, which is the other member to be welded, at a speed greater than the end portion, and a movable welding bogie having a front electrode and a rear electrode for gripping the traveling preceding member and the transporting trailing member, respectively. And position detection means provided on the welding carriage at least two positions behind the front electrode and having a front detection element and a rear detection element for detecting an end of the member to be welded, and at a position rearward from the position detection means. Speed detecting means for detecting the transport speed of the following member, contact detecting means for detecting that the front end of the following member abuts the rear end of the preceding member, and the position detecting means and the speed detecting means. At the signal A welding bogie is provided so that the leading electrode is gripped by the front electrode at a predetermined position, and then the trailing member is decelerated and the trailing electrode grips the trailing member when the trailing member abuts on the leading member. And a control means for controlling the speed of the electrode, the timing of gripping the electrodes, and the transfer speed of the transfer means. A flash welding apparatus for welding two members to be welded during transfer. 2. The control means causes the stopped bogie to travel forward at a speed lower than the traveling speed of the preceding member based on a rear end detection signal of the preceding member by the rear detecting element. When the rear end is detected or immediately thereafter, the front electrode is used to grip the preceding member and the welding trolley is placed in the running state at the same speed as the preceding member. Adjusting the conveying means based on the front end detection signal of the row member so as to decrease to a speed slightly larger than the preceding member,
The rear electrode is gripped by the rear electrode based on the detection signal of the contact detection means, the gripping of the front electrode and the rear electrode is released after flash welding, and the welding cart is set back to the original position. The flash welding apparatus for welding two members to be welded during transportation according to claim 1. 3. The contact detecting means according to claim 1, wherein the contact detecting means is an acceleration detecting element or a vibration detecting element which is attached to the front electrode and detects a collision of the following member with the preceding member. A flash welding device that welds two members being transported. 4. The transporting device according to claim 1, wherein the contact detecting means is a speed detecting element for detecting that the speed of the following member has become equal to the speed of the preceding member. Flash welding equipment for welding two workpieces.