JP2012061511A - Coil material connection method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil material connection method which does not generate any curve at a welded part as a boundary even if the rear end of a foregoing coil and the top end of a following coil are welded in a production line, and to provide a coil material connection device.SOLUTION: When connecting the ends of a foregoing coil 9a and the following coil 9b, the rear end 91 of a belt-like material of the foregoing coil 9a is butted to the top end 92 of the following coil 9b in the production line. The belt-like material 90 is held by a clamp mechanism 32 at the front and rear of a butted part, and a backing material 6 comprising a heat-resistant ceramic is arranged on the back side of the butted part. Then, the butted part is welded and joined by running the torch 31 of arc welding on the surface of the butted part.

Description

  The present invention relates to a coil material connection method and a coil material connection for connecting a band material end of a preceding coil and a band material start end of a succeeding coil to a coil wound with a band material such as a thick plate used for press working or the like. Relates to the device.

  For example, in a production line for progressive press processing, a strip such as a steel plate is fed from a coil by an uncoiler and supplied to a progressive press machine. When the supplied coil is lost, a new coil is replaced. In order to shorten this switching time and improve the operation efficiency of the production line, the ends of the strips are joined together by welding to lengthen the coil (Patent Documents 1 and 2).

JP 2005-95963 A

Japanese Patent Laid-Open No. 6-23559

  By the way, even if the length of the coil is increased, the winding diameter is limited due to handling such as transportation and the size of the coil attachment portion in the uncoiler. Therefore, it is conceivable to join the end portions of the preceding coil and the succeeding coil by butt welding in a production line such as progressive press working. At this time, if the welded joint is deformed due to thermal distortion and the strip is bent in the shape of a letter in the length direction, if it is supplied to the progressive press as it is, the welded joint will be caught by the progressive die and feed failure will occur. It causes problems such as raising or damaging progressive molds. In particular, when the thickness of the strip becomes thick, the backside is not formed well, and the distortion at the welded joint increases. Accordingly, it has been considered technically difficult to weld and join the preceding coil and the succeeding coil in the production line and supply them to a processing apparatus such as a progressive press machine.

  The present invention has been made in view of the above circumstances, and provides a coil material connection method and a coil material connection device that do not cause bending at the weld joint even when the previous and following coil ends are welded together in a production line. The issue is to provide.

The coil material connection method according to the present invention includes:
A coil material connection method for connecting ends of a preceding coil and a succeeding coil,
The end of the strip material of the preceding coil fed into the production line and the end of the strip material of the succeeding coil are butted against each other, the belt material is held by the clamp mechanism before and after the butted portion, and the back side of the butted portion is heat resistant A backing material made of a conductive ceramic is disposed, and an arc welding torch is run from the front side of the butt portion to weld and join the butt portion.

  With the above configuration, by using a backing material made of heat-resistant ceramic, welding heat is held so as not to escape on the back side of the butt portion. Thereby, it can melt | dissolve fully to the back side of a butt | matching part by arc welding, and can form a favorable back | restoration stably in a welding junction part. In addition, since the heat of heat is retained on the back side of the butt portion by the heat-resistant ceramic backing material, a temperature difference hardly occurs between the front side and the back side of the weld joint, and thermal distortion at the weld joint is suppressed. be able to. Furthermore, by holding the strips before and after the butting portion by the clamp mechanism, it is possible to suppress the bending of the strip with the weld joint as a boundary during welding. Therefore, it is possible to suppress the bending of the band material from the welded joint due to thermal strain.

In the above coil material connection method,
The strip taken out from the coil is intermittently fed at a predetermined feed pitch in the production line. When the end of the strip of the preceding coil is detected, intermittent feed is performed at the end detection time or when it is intermittently fed for one pitch or more after the end detection. By stopping and moving the entire apparatus for connecting the coil material and / or the table on which the torch is disposed, the welding position by the torch is arranged between the abutting portions of the preceding coil and the succeeding coil. It is desirable to perform butt welding.
Thereby, since the said apparatus main body and / or the said table are moved, the welding position by a torch can be positioned easily and rapidly in the middle of the butt | matching part of a preceding coil and a succeeding coil.

In addition, the coil material connecting device according to the present invention includes:
A coil material connecting device for connecting ends of a preceding coil and a succeeding coil,
An apparatus main body installed in a production line that intermittently feeds the strip taken out of the coil at a predetermined feed pitch and supplies it to the processing apparatus;
A clamp mechanism for holding the band material before and after the abutting portion where the ends of the band material end of the preceding coil and the band material start end of the subsequent coil are abutted;
A torch for arc welding from the front side of the butt,
A backing material made of a heat-resistant ceramic that is attached to the table on which the torch is disposed and is disposed on the back side of the butt portion;
Transporting means for allowing the apparatus main body and / or the table to move forward and backward in the belt feeding direction.
With the coil material connecting device having the above-described configuration, the same operation as the above method can be obtained.

  As described above, according to the coil material connecting method and the coil material connecting device according to the present invention, even if the previous and subsequent coil ends are welded together, the band material is bent in the length direction with the welded joint as a boundary. Is suppressed, and can be joined substantially straight. Therefore, in the production line, the band material start end of the succeeding coil can be welded and joined to the end of the band material of the preceding coil, and then can be smoothly supplied to a processing apparatus such as a progressive press machine. Therefore, the production line stop time due to material shortage can be greatly shortened, and the operation rate of the production line can be improved.

It is a side view which shows the production line of the progressive press process by which the coil material connection apparatus by embodiment was arrange | positioned. It is a top view for demonstrating schematic structure of a coil material connection apparatus. It is a side view which shows the strip | belt material of the welding joint vicinity, The figure (a) (b) is a thing made from chromium copper to the backing material, when the thing made from a heat resistant ceramic is used for the backing material. It is a side view which shows the distortion condition of each strip | belt material in the case of using the thing.

  As shown in FIG. 1, the production line for progressive press working includes an uncoiler 11 that supports a strip 90 from a coil 9 (9b) of a press material such as a steel plate, and a strip 90 that is fed from the uncoiler 11. There are provided a leveler 12 for conveying the sheet while correcting the bending wrinkles and a progressive press machine 13 provided with a progressive mold 14. The progressive press 13 is provided with a feed mechanism 15 that intermittently feeds the strip 90 at a predetermined feed pitch and supplies it to the progressive die 14.

  And the coil material connection apparatus 10 of this embodiment is arrange | positioned between the leveler 12 and the progressive press 13, and the coil (preceding coil 9a) 9 currently supplied in the uncoiler 11 is lost, and a new coil (rear) When the row coils 9b) 9 are replaced, the band material end 91 of the preceding coil 9a and the band material start end 92 of the subsequent coil 9b are joined. In addition, the strip 90 between the leveler 12 and the coil material connecting apparatus 10 is disposed in a state of hanging in a loop shape. As a result, the looped portion 96 of the strip 90 serves as a buffer portion, and when the strip material is connected by the coil material connecting device 10, the strip 90 is appropriately moved regardless of the intermittent feed feed pitch during production. Can do.

  The coil material connecting device 10 has a device main body 20 installed so as to be able to move back and forth along the feeding direction of the strip 90, and is installed in the device main body 20 on the welding machine 3 and the inlet side of the welding machine 3. A pair of sandwiching rolls 5 for sandwiching a strip 90 to be introduced into the welding machine 3 from above and below, a strain removing roll 4 installed on the outlet side of the welding machine 3, and a strip end 91 of the coil 9 being intermittently fed. And a sensor 24 for detecting. The upper roll of the sandwiching roll 5 and the upper roll of the strain relief roll 4 are configured to be movable up and down by being connected to the lifting means 51 and 41, respectively. The upper roll of the sandwiching roll 5 and the upper roll of the strain relief roll 4 are arranged in the lowered position when connecting the coil material, and prevent intermittent feeding of the strip 90 during normal production by the progressive press 13. It is raised so as not to be placed in the raised position. The strain relief roll 4 is disposed to straighten even when a slight distortion occurs in the welded joint portion of the strip 90, but the strain relief roll 4 may not be installed.

  The welding machine 3 is an apparatus for welding and joining the end portions of the strip material end 91 of the leading coil 9a and the strip material start end 92 of the succeeding coil 9b material. This welding machine 3 includes a table 33 on which the strips 90 of the preceding coil 9a and the succeeding coil 9b are arranged, and a butt portion between the strip end 91 of the preceding coil 9a and the strip start end 92 of the succeeding coil 9b. A torch 31 for Tig welding, a pair of front and rear work pressers (clamp mechanism) 32 for pressing and holding the strip 90 against the table 33 from above and before and after the butting portion, and a butting portion attached to the table 33 And a backing material 6 disposed on the back side of the.

  In this welding machine 3, the other electrode connected to the tungsten electrode rod of the torch 31 during Tig welding is connected to the conductive table 33 and a voltage is applied between the strip 90 in contact with the table 33. Let Thereby, it is possible to easily and quickly perform the welding operation on the strip 90 intermittently fed in the production line, and to shorten the line stop time during welding joining. Further, the welding of the butt portion is tack welding in which the butt portion is welded intermittently, but the present invention is not limited to this, and the entire length of the butt portion may be welded. The welding method is not limited to Tig welding, but may be various arc welding methods such as plasma welding.

  With reference to FIG. 2, the torch 31 is supported by the torch transfer mechanism 35, and the torch 31 can travel in the direction perpendicular to the feeding direction of the strip 90 by the torch transfer mechanism 35. The torch transfer mechanism 35 is provided on a mounting base 34 that extends laterally from the table 33. The work presser 32 is configured such that a pressing part at the tip thereof can be moved up and down by a lifting mechanism such as a cylinder. The pressing part is lowered to press the band material 90 from above and press and hold it with the table 33. The work presser 32 is supported by a frame (not shown) attached to the table 33. A sensor 24 is also attached to the frame. Note that the torch 31 and the work presser 32 are raised by the torch transfer mechanism 35 and the lifting mechanism and disposed at the raised position so as not to prevent intermittent feeding of the strip 90 during normal production by the progressive press 13.

The backing material 6 is made of heat-resistant ceramic.
By the way, in the case of butt welding by arc welding, the backing material 6 is generally made of chrome copper having excellent heat conductivity so as to quickly release welding heat. Therefore, when the backing material 6 made of chrome copper is used, the temperature difference between the front and back of the strip 90 becomes large and it is difficult to form a good back with a small number of passes. Therefore, it becomes easy to bend in the shape of a strip in the length direction of the strip material due to the thermal strain as a boundary.
On the other hand, according to the backing material 6 made of heat-resistant ceramic, it is held so that the welding heat does not escape on the back side of the butted portion with which the backing material 6 abuts. Therefore, the penetration at the butt portion is deep and a good back surface is formed. As a result, it is possible to weld the coil ends without distortion in the production line. As such a heat-resistant ceramic backing material 6, those made of zirconia are preferably used, but are not limited to those made of zirconia, but may be various heat-resistant ceramics such as silicon nitride and alumina.

  Further, the backing material 6 is formed in a planar shape such as a square bar shape or a plate shape, and the upper surface of the table 33 is flush with the upper surface of the backing material 6 and the upper surface of the table 33. It is attached to the formed groove. As a result, the end portions of the strips 90 of the leading coil 9a and the succeeding coil 9b can be placed in contact with the conductive table 33 in a parallel posture without rattling on the table 33. Therefore, the ends of the preceding coil 9a and the succeeding coil 9b can be held in a parallel posture during welding.

  In addition, the coil material connecting device 10 is installed at the bottom of the device main body 20 and moves the device main body 20 back and forth along the feeding direction of the strip 90 to move the entire coil material connecting device 10 in the first direction. The linear guide device (transfer means) 21 and the welding machine 3 installed on the bottom of the table 33 and moving the table 33 back and forth along the feeding direction of the strip 90 move in the above direction. And a second linear guide device (transfer means) 22 to be operated. In addition, although this coil connection apparatus 10 is provided with the two transfer means of the 1st, 2nd linear motion guide apparatuses 21 and 22, the structure provided with any one transfer means may be sufficient.

  As a method of connecting the preceding coil 9a and the succeeding coil 9b in the production line by the coil material connecting device 10 having the above configuration, first, the strip material end 91 of the preceding coil 9a that is pitch-fed to the progressive press 13 is firstly used. Is detected by the sensor 24, the intermittent feeding is stopped at the time of detection of the belt end 91 or at the time of intermittent feeding of one pitch or more. Subsequently, the apparatus main body 20 is moved forward or backward by the first linear motion guide device 21 so that the traveling position of the torch 31 is arranged at the position of the band material end 91 of the preceding coil 9a.

  On the other hand, the strip 90 of the succeeding coil 9b newly attached to the uncoiler 11 is sandwiched in the vicinity of the strip material start end 92 by the sandwiching roll 5 of the coil material connecting apparatus 10 via the leveler 12, and the strip of the succeeding coil 9b is sandwiched. The material start end 92 is butted against the band material end 91 of the preceding coil 9a. Then, the table 33 is finely moved forward or backward by the second linear motion guide device 22 so that the traveling position of the torch 31 is aligned between the abutting portions of the preceding coil 9a and the succeeding coil 9b. As a result, the abutting portion between the end portions of the strip material end 91 of the preceding coil 9a and the strip material start end 92 of the succeeding coil 9b is arranged on the backing material 6 and the torch 31 runs substantially in the middle of the butted portion. The position is arranged.

  Then, the pressing portions of the front and rear workpiece pressers 32 are lowered, and the band material 90 is pressed and held on the table 33 by pressing it before and after the butting portion. Next, tack welding or total welding is performed while lowering the torch 31 and traveling in the plate width direction from one end of the butted portion toward the other end. As a result, the strip material end 91 of the leading coil 9a and the strip material start end 92 of the succeeding coil 9b are welded together.

  When the welding joining is completed, the torch 31 and the work presser 32 are raised, the strip 90 is intermittently fed, and the weld joint 93 is strained and passed through the roll 4. Thereby, even if it can supply to the progressive press machine 13 without trouble, when the distortion | strain has arisen slightly in the welding junction part 93, it will correct in a straight state. Thereafter, the upper rolls of the strain relief roll 4 and the sandwiching roll 5 are raised and automatically intermittently fed to restart the press work in the progressive press 13.

According to the above embodiment, by using the backing material 6 made of a heat resistant ceramic in the welding machine 3, the welding heat is held so as not to escape on the back side of the butt portion. Thereby, it can fully melt | dissolve to the back side of a butt | matching part by Tig welding, and can form a favorable back | restoration stably in the welding junction 93. Moreover, since the heat of welding is held on the back side of the butt portion by the heat-resistant ceramic backing material 6, a temperature difference hardly occurs between the front side and the back side of the weld joint portion 93, and thermal distortion at the weld joint portion 93 is caused. Can be suppressed. Further, when welding, the band 90 is pressed and held by the work holder 92 before and after the abutting portion, so that the band 90 is not bent at the weld joint 93 during welding or cooling after welding. it can. From the above, even if the previous and following coil ends are welded together, the bending of the strip 90 with the welded joint 93 as a boundary is suppressed, so that it can be joined substantially straight. Therefore, in the production line, the band material start end 92 of the succeeding coil 9b can be welded and joined to the band material end 91 of the preceding coil 9a, and then can be smoothly supplied to the progressive press 13. Therefore, the production line stop time due to material shortage can be greatly shortened, and the operation rate of the production line can be improved. In the case of the present apparatus 10, the welding joining operation is not always performed during production by the progressive press 13, but is performed at a time when the coil 9 is replaced (for example, about every hour). No cooling device is required.
In addition, the coil material connection apparatus 10 of the said embodiment is applicable not only to a progressive press line but another production line.

According to the above embodiment, when the end portions of the preceding coil 9a and the succeeding coil 9b were all welded by Tig welding, the degree of distortion caused by the weld joint 93 was confirmed.
Example 1
・ Backing material 6 in welding machine 3: made of zirconia (heat-resistant ceramic)
・ Strip 90 of coil 9: high tensile steel, plate thickness 4.5 mm, plate width 90 mm
(Example 2)
・ Backing material 6 in welding machine 3: made of zirconia (heat-resistant ceramic)
-Strip 9 of coil 9: SS41, plate thickness 3.2 mm, plate width 100 mm
(Reference example)
・ Backing material 6 in welding machine 3: made of chrome copper ・ Strip material 90 of coil 9: SS41, plate thickness 3.2 mm, plate width 100 mm

(Evaluation)
A band sample obtained by cutting the welded joint 93 into a predetermined length in the middle of the band 90 after welding is joined to the band 90 part on the preceding coil 9a side with the band 90 part on the side of the subsequent coil 9b being horizontal. The lift was measured.
In Example 1, with reference to FIG. 3A, the lift at the position of 180 mm from the weld joint 93 in the length direction on the preceding coil 9a side is 0.3 mm (the distortion angle at the weld joint 93 is About 0.1 degree). It was confirmed that the 0.3 mm float did not change with the degree of distortion caused by bending of the strip 90 itself, and that it could be considered that there was almost no bending due to welding. Further, the back of the welded joint portion 93 of Example 1 was also well formed.
In Example 2, with reference to FIG. 3B, the lift at the position of 150 mm from the weld joint 93 in the length direction on the preceding coil 9a side is 1.2 mm (the distortion angle at the weld joint 93 is About 0.46 degrees). If the float is about 1.2 mm in the length range of 150 mm, it is confirmed that it is within a range that can be smoothly supplied without causing problems such as catching on the progressive die 14 of the progressive press 13. It was. From this, when compared with Example 1, it was confirmed that it is advantageous for suppressing welding distortion with respect to the strip 90 of the thick plate as in Example 1. Further, the back side of the welded joint portion 93 of Example 2 was also well formed.
On the other hand, as compared with Examples 1 and 2, in the reference example (Example 2 and the material and dimensions of the band material 90 are the same), referring to FIG. The lift at the position of 150 mm in the length direction on the side was 6.5 mm (the strain angle at the weld joint 93 was about 2.48 degrees). If a float of 6.5 mm occurs in the 150 mm length range, the progressive die 14 of the progressive press machine 13 is caught and cannot be supplied to the progressive press machine 13 as it is. Moreover, when the back surface of the welded joint portion 93 of this reference example was observed, it was confirmed that the penetration was shallow and no back surface was formed.

3 welding machine 6 backing material 9a leading coil 9b trailing coil 10 coil material connecting device 11 uncoiler 12 leveler 13 progressive press 20 device body 21 first linear motion guide device (transfer means)
22 Second linear motion guide device (transfer means)
24 Sensor 31 Torch 32 Workpiece presser (Clamp mechanism)
33 Table 90 Band material 91 Band material end 92 Band material start end 93 Welded joint

Claims (3)

A coil material connection method for connecting ends of a preceding coil and a succeeding coil,
The end of the strip material of the preceding coil fed into the production line and the end of the strip material of the succeeding coil are butted against each other, the belt material is held by the clamp mechanism before and after the butted portion, and the back side of the butted portion is heat resistant A coil material connecting method in which a backing material made of a conductive ceramic is disposed, and an arc welding torch is run from the front side of the butt portion to weld and join the butt portion. In the coil material connection method according to claim 1,
The strip taken out from the coil is intermittently fed at a predetermined feed pitch in the production line. When the end of the strip of the preceding coil is detected, intermittent feed is performed at the end detection time or when it is intermittently fed for one pitch or more after the end detection. By stopping and moving the entire apparatus for connecting the coil material and / or the table on which the torch is disposed, the welding position by the torch is arranged between the abutting portions of the preceding coil and the succeeding coil. Coil material connection method for butt welding. A coil material connecting device for connecting ends of a preceding coil and a succeeding coil,
An apparatus main body installed in a production line that intermittently feeds the strip taken out of the coil at a predetermined feed pitch and supplies it to the processing apparatus;
A clamp mechanism for holding the band material before and after the abutting portion where the ends of the band material end of the preceding coil and the band material start end of the subsequent coil are abutted;
A torch for arc welding from the front side of the butt,
A backing material made of a heat-resistant ceramic that is attached to the table on which the torch is disposed and is disposed on the back side of the butt portion;
A coil material connecting apparatus comprising: a transfer means that allows the apparatus main body and / or the table to move forward and backward in the band material feeding direction.

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