JPS60244484A - Welding device for electric welded pipe - Google Patents

Abstract

PURPOSE:To provide a titled device which welds satisfactorily a pipe-shaped material up to the rear end thereof by a profiling current conducting piece by inserting a current conducting jig into the plate-shaped material near the rear end of said material in the advancing direction thereof in the stage of forming the pipe-shaped material to be welded after the ends on both sides of the plate- shaped member are butted and pressed to face each other by squeeze rolls. CONSTITUTION:A material 12 to be welded formed to the pipe shape by bending the ends on both sides of the plate-shaped member is fed by pinch rolls 13, 14 and the ends on both sides are pressed by the squeeze rolls 16. Said ends are welded by the current conducted contactually from the current conducting tip positioned by cylinders 23, 29. The current conducting jig 46 is lowered by a cylinder 37 near the rear end of the plate-shaped material in the advancing direction thereof and is inserted into the pipe-shaped material by a cylinder 45 to butt and press the current conducting piece 49 thereof to the rear end of the material 12. The current conducted to the tip 18 flows through the piece 49 to the material 12 and welds satisfactorily said material to the terminal thereof. The piece 49 is held by a supporting spherical joint 56 of a spring 62 to a frame 52 and contacts satisfactorily and flatly with the material 12.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an electric resistance welding tube welding device t, and in particular to an energizing jig for the electric resistance welding device that welds the rear end of the electric resistance welding tube without causing welding defects. Regarding.

In conventional electric resistance welding pipe welding, there is a part at the rear end of the pipe that remains unwelded, and this part does not become a product. Conventionally, this
As a method to prevent this, an auxiliary welding piece is welded to the rear end of the tube. Blindness to sexuality. Also extra material (auxiliary piece)? Must be used.

KolrL? Now let me explain by referring to Figures 1 and 1 to 3.

2 is a workpiece that is fed by a vinyl roll l, and a current-carrying tip (hereinafter simply referred to as a chip) 3a, 3b'ii is brought into contact with the side parts 2a, 2b of the workpiece, and the side part 2a, 2b is placed in the vicinity of the side part 2a, 2b of the workpiece. Make contact in a v-shape of ±2. As a result, 'ta' from the high frequency source connected to the chips 3a and 3b is
1I1 forms a seven-figure shape as shown by arrows a and b in Figure 1.
Part 1 26 * 2 Convex flow n, its turning point (7
At the apex of the letter n), it is rapidly heated due to the proximity effect.
easily reach the bath contact temperature.

Therefore, 711 from both sides of the 7-character apex work 20]
Pressure 0-roll (squeeze roll) 4 to press knife n, 1I
This is because parts 2a and 2b of 11 are not welded to the wall.

In the figure, arrow A is the direction in which the workpiece 2 moves.

In the above case, as shown in Fig. 2a and b, the chips 3a+3b are removed from the workpiece 2 at the rear end of the workpiece 2, and the rear end of the workpiece 2g) becomes longer, making it impossible to weld by that amount. Become. For this reason, conventionally, the rear end of the workpiece 2 is also welded by welding or pressure-welding the contact auxiliary pieces 5a and 5b shown in FIG. 3 and applying current to the workpiece 2.

However, according to the above method, the progress mentioned before ■ERW pipe welding? After this, the welding auxiliary pieces 5a+5b must be completely cut off, and it is inefficient to incorporate the process of f# connection and cutting of the welding auxiliary pieces into the electric resistance welding pipe welding line. ■To cut the welding auxiliary piece, you can either cut it at the welded part between the welding auxiliary piece and the workpiece, or cut off a part of the workpiece and throw it away. The former method had drawbacks such as requiring a lot of labor time for the work and also requiring labor to correct the workpiece.

Therefore, the applicant previously filed Japanese Patent Application No. 57-157745 and proposed an electric resistance welding pipe welding device t which improved the above-mentioned conventional drawbacks. This includes a material to be welded which is formed into a tubular shape with both sides of a plate member facing each other, a feeding means for feeding the material to be welded in the fine direction, and a feeding means that feeds the material to be welded in a fine direction, and a means for feeding the material to be welded in the vicinity of both sides while feeding the material to be welded. In the electric resistance welding tube bath welding device, the electric resistance welding tube bath welding device is comprised of a pair of energizing tips that weld the electric resistance welding tube to both sides of the electric resistance welding tube. an energizing jig that extends the rear end of the energizing tip that contacts the energizing tip and is energized; and a moving means that moves the energizing jig into or out of the welding line. and a traveling means for causing the energizing jig to travel in a direction in which the material to be welded is fed out.

Since the above-mentioned structure is clearly seen in Application No. 57-157745, the overall outline will be explained here with reference to FIG. 4. That is, in the same figure, 11 is on the bed and 12 is on the bed? #NjJ is the material to be bathed (hereinafter referred to as the work). Three pairs of pinch rolls 13, 14, and 15 are provided on the bed 11 as means for sending out the work 12'i, and a pair of squeeze rolls 16 for pressurizing the work 12 from both sides are provided.

In this embodiment, the workpiece 12 is one side portion 1 of a plate-like member.
7 facing each other and formed into a square tube shape is used. 18 is a pair of power-carrying chips.

It is attached to the tip of the contact support d@32. 30 is a matching transformer, and the contact support device 1t32 is installed at the bottom of this transformer.
is installed. The energizing tip 18 is connected to the workpiece 1
During the feeding of 2, it comes into contact with the vicinity of both side parts 17.
, and when energized, the portions of the both sides 17 that are pressurized by the squeeze roll 16 are brought into contact with the tube.

Since the energizing tip 18 must be moved depending on the size of the workpiece 12, etc., it has the following structure.

That is, a support member 20 is provided over two frame metals (not shown in the figure) that are substantially perpendicular to the workpiece 12, and the support member 20 is moved in the longitudinal direction of the workpiece 12 into the dovetail groove of the support member 20. The vertical movable table 22 is fitted into the frame. Then, the vertical moving table 22 (1-
A hydraulic cylinder 23 for moving along the dovetail groove is fixed to the support member 20.

The vertical moving table 22 is also provided with a dovetail groove.
A companion hydraulic cylinder 26 is fixed to the vertically movable table 22 into which the horizontal movable table 25 is fitted, and which moves the vertically movable table 25 along the dovetail groove. Lateral transfer @ Sora 25 is a') #IIjft
A vertically movable table 82B is provided so as to be movable in the vertical direction, and a hydraulic cylinder 29 for moving the vertically movable table 28' (i- is fixed to a horizontally movable column 825. 3 in the figure).
Reference numeral 1 denotes a power supply cable that supplies all of the high frequency current to the matching transformer 30.

Furthermore, a jig 46 is provided below the matching transformer 30 with respect to the vertically movable table 28 and is movable in the vertical direction and in the direction in which the workpiece 12 moves.

That is, the energizing jig 46 is connected to the rod 45' of the hydraulic cylinder 45 as a traveling means, the moving member 44, and the holding member 47 at the tip thereof.

The hydraulic cylinder 45 is operated by the hydraulic cylinder 37.
It is attached to the suspension member 3B to be used. and.

The hydraulic cylinder 37 is attached to the support plate 33 via the connecting members 34, 35, 36i. The support plate 33 is moved up and down @stand 2
8 (5).

To explain the operation of the above-mentioned electric resistance welding pipe welding device, the workpiece 12 transferred by the vinyl rolls 13 and 14 is pressurized from both sides by the squeeze roll 161C, so that both sides s17, which were separated from each other, It is pressed in position. on the other hand,
The high-frequency current fed from the power supply cable 31 is transformed by a matching transformer 30, flows from the current-carrying tip 18 to the workpiece 12, and is folded at the center of the line segment where the axis of the squeeze 16 is fully seated. The workpiece 12 is then returned to be heated and welded.

When the rear end of the work 12 comes close to the squeeze roll 16 as shown in FIG.
The vinyl rolls 13 and 14, which were being transferred while being completely clamped, move in a direction away from the work 12, and at the same time, the hydraulic cylinder 37 is activated and lowered to a position slightly lower than the upper surface of the work 12.

Next, a limit switch (not shown) detects that the energizing jig 46 has descended to a predetermined position, and the hydraulic cylinder 45 is actuated, and the energizing jig 46 cuts the workpiece 12 at a faster speed.
When the node 12i4 was applied, a touch sensor (not shown) detected that the tip of the current-carrying piece 49. At the same time, the workpiece 12 moves at the same speed as the workpiece 12.
Let's run it together.

Even when the workpiece 12 is fed out in this state and the threading tip IB is recessed outward from the rear end of the workpiece 12, the current-carrying tip 1B rests on the current-carrying pieces 49 and 49'.
As a result, the current can be passed from the current-carrying tip 18 to the work 12 by valving the current-carrying pieces 49 and 49' until the rear end of the work 120 reaches the welding position.

In other words, in the process explained in FIG. is activated, the energizing jig 46 returns to its original position, and one cycle is completed.

Purpose of the Invention The present invention relates to an electric resistance welding pipe welding apparatus as claimed in the applicant's earlier application, and in particular improves the electric jig by: It is an object of the present invention to provide a current-carrying jig which is of good quality and which allows a current-carrying tip to smoothly come into contact with a current-carrying piece.

SUMMARY OF THE INVENTION In order to achieve all of the above objects, the present invention involves feeding a material to be welded, which is formed into a tubular shape f' with both sides of a plate-like member facing toward each other, in the axial direction of the material to be welded. means, a pair of energizing tips that come into contact with the vicinity of both aS and are energized and are statically in contact with the electrically welded tubes on both sides while the material to be welded is being fed at a voltage;
The through hole 1 is brought into contact with the beam end of the workpiece to be welded.
; an ijiζ jig that abuts the tip and extends the rear end portion of the aIL; a moving means for moving the entire energizing jig into or out of the line of the workpiece; In the electric resistance welding pipe welding apparatus 1, which comprises a traveling means for causing the tool to travel in the welding material delivery direction, the current-carrying jig has a current-carrying piece that moves at a constant angle of F9T in the left-right direction via a spherical joint. .01 It is supported so that it can move freely, and it is also supported so that it can move up and down on the back of a spring. Therefore: 11!1 The electric piece contacts the inner surface of both sides of the rear end of the workpiece with pressure at the cutting edge. The explanation will be made assuming that the structure is such that the workpiece can be closely attached to the workpiece and can be freely swung according to the tilting of the workpiece.

Each figure shows the details of the energizing jig 46.
, is a 49'tsmm piece (mA board), and the current-carrying tip 18 on the top surface slides and runs to supply power to the armature.
Ru. Each: A electric piece 49, 49'&S, as shown in Fig. 5 IAI and Fig. 7, are arranged in parallel on the left and right with insulation &50 placed in the middle, and in the front direction is related to maintenance etc. The S1 pieces 49 and 49' are separated by a bolt 51 and connected so as to be separable. An insulating plate 52 is further provided horizontally at the lower end of the intermediate insulating I&50. This insulating plate 52 is attached to the upper surface of a frame 53, which will be described later, as shown in FIG. This L sea urchin,
The acidic pieces 49.degree. and 49' are electrically insulated from the frame 53 and have an N-hole structure.

Reference numeral 54 denotes an L-shaped inner for adjusting the thickness of the workpiece, which is attached to the tip of the front current-carrying piece 49'. As shown in FIG. 6 IBI, the L-shaped inner 54 is provided on the upper 1s edge of the rising portion 54' or on the same surface as the upper surface of the current-carrying piece 49'.
In addition, the height of the rising portion 54' is set to be equal to the root thickness of the workpiece 120. Therefore, the passage pieces 49, 49'
When it moves forward and catches up with the workpiece 2, the inner side of the workpiece 12 on the other side 2', 2' (Fig. 6 (Al)) enters the L-shaped inner 54, so that the upper surface of the workpiece 12 and the current-carrying piece The upper surface of the current-carrying piece 49' is flush with the top surface of the current-carrying piece 49', and there is no problem such as when the current-carrying tip 18 is transferred from the workpiece 12 to the current-carrying piece 49', such as getting caught or jumping from the top surface.

This L-shaped inner 54 is designed to be replaced with one having a height of the rising portion 54' commensurate with the change in the thickness of the workpiece 12.

The sieving quality of the rising portion 54' can be easily adjusted by varying the thickness t of the bottom of the L-shaped inner 54.

Next, the current-carrying pieces 49 and 49' are elastically supported by the frame 53 so as to be able to follow the inclination A of the workpiece 12. That is, in FIGS. 5, 7, and 8, two bearing members 55 each having a border-shaped cross section are attached to the lower surface of each utility pole 49 and 49'.
5, a ball joint 56 is inserted through the shaft hole 55' at the bottom thereof.
It is inserted and supported in the 82I movement position.

On the other hand, the upper wall 53'iC of the frame 53 is attached with an 8t&t bushing 57i made of electrically insulating material, and a threaded shaft 58, which is an example of a thin threaded shaft 58, is pushed through the inside of this bushing 57 and integrally supported from the ball joint 56. is hanging down.

The frame 53 is made of a steel material having a T-shaped cross section, for example, as shown in FIG.
A' (1) Bolts 59 and rainbow L-shaped supports 60 on both sides
A bush 61 made of an electrically insulating material is attached to the support 60iC, and the screw shaft 58 of the upper S is inserted through this bush.

The above screw shaft 5811! A coiled spring 62 is wound around the spring 62, and the upper and lower ends of the spring 62 are locked by spring holders bA and 64 having a dish-shaped cross section. The upper spring retainer 6A has a pressure adjustment nut 65 that is tightened with a double nut.
I'm holding it down. The lower spring presser 64 is the bushing 6.
It's on 1. Push; screw inserted into L61 +
The tip of '11158 is a dapurnatsu) which spirals into ti6. 67 is a washer made of flexible P edge material L9. Therefore, 1. According to the above structure, the 4λ screw shaft 58 can be moved up and down by the spring 62, and the ball joint 56 is attached to the upper end of the screw shaft 58. J7 squirrel, energized piece 49
, 49' are supported, so dK through' turtle piece 49,
49' is in the direction of arrow ll:l]1o) I (c) in Figure 7,
In other words, it can be moved up and down, and the left and right ICL can be rotated by a degree. In other words, with the force of the spring 62, a
The electric poles 49, 49' can completely suppress the blow caused by hitting the lower part of the workpiece 12, and the workpiece 12 and the current-carrying pieces 49, 49' are elastically in contact with each other and are closely interlocked. The upper nut 65 is used to perfectly adjust the spring b2, and the lower nut 66 is used to adjust the gap G (
(This is being adjusted.

In addition, in FIG. 5, a support member 68 is fixed at the base end of the frame 53, and the support member 68 is attached to the flange b.
It is pivotally supported by a support shaft 71 on a bracket 70 fixedly attached to the base plate 9. A nut 73 is fixed to the support member 68, and 72 adjustment bolts are screwed into the support member 68 so as to be able to move forward and backward in the horizontal direction. ing. In other words, 31! l Since the electric jig 46 is completely under control and the influence of the movement is caused, turn the knob f72'/(turning # In order to make the above fC
It becomes weaker during the Wami-kai. The flange 69 is fixed to the holding member 47 at the tip of the sliding member 44 as shown in FIG.
Ru.

9. In Fig. 5, 74 is a cooling water circuit provided on the current-carrying piece 49, and 75 is a nipple for connecting a water supply hose, which sends cooling water t1f@ to the circuit 14, and generates heat due to the current in the current-carrying piece 49°49'. ? It is prevented.

As described in detail, according to the present invention, there is no need to weld an auxiliary welding piece to the material to be bathed, unlike floor contact.

Since the rear end of the material to be bathed can be welded, it goes without saying that the work can be done efficiently without stopping the flow of the line, and the energizing jig used for this work can Since it is elastically supported so that it can be freely rotated, and can also be freely rotated in the left and right directions, the energizing jig and the material to be welded can be easily moved. l! I! !
11-I will lose by making it good,

[Brief explanation of drawings]

Figures 1, 42, and 3 are explanatory diagrams of the loosely sewn pipe bathing joints in contact with the floor, Figure 4 is an overall perspective view of the ERW pipe bathing device embodying the present invention, and Figure 5 [Al , IBI is a tttta tool.
F view and partially cutaway front view, Figure 6 Chin 1, IBI is a plan view and cross-sectional view of the tip of the energizing jig, Drain 7 is Figure 5 IB
FIG. 8 is a cross-sectional view of the support structure of the current-carrying piece. 12... Workpiece, 13.14.15... Vinci roll, 18... Energizing tip, 46... Energizing jig, 49
゜49'-a IiL piece, 53-°7+/-A, 56
°-*Joint, 58...Screw shaft, 62...Spring. Figure 1 Figure 2 Figure 3 (c) Figure 8 Procedural amendment 1. Indication of the case 1982 Special Request No. 100739 2, Name of the invention 11 Sewing pipe welding device 3, Person making the amendment (61Oon Co., Ltd., Mei 11L, To 4, Agent: Akii, Chuo-ku, Higashi 5i, 104 Japan) Town 1-29 Kawasaikai Building-15
Corrected to 7645J.

Claims (1)

[Scope of Claims] A means for feeding in the fine direction of the welded material T-, M which is formed into a tubular shape with both sides of the plate-like member facing each other; Abuts near the both sides n
a pair of current-carrying tips that connect the both sides to the electric resistance welded tube 811; and a rear end that abuts the rear end of the workpiece and is energized by contacting the current-carrying tips. an energizing jig that extends the energizing jig; a moving means that moves the energizing jig into or out of the line of the welded material; and a traveling means that moves the energizing jig in a direction in which the welded material is delivered. ERW pipe 11 made up of! In the I-connection device, the energizing jig rotatably supports the energizing piece on the spherical joint, and the support shaft provided integrally with the spherical joint is
An electric resistance welding pipe welding device characterized by a structure in which it is supported by a frame so that it can be raised and lowered by a spring.