JPH1158047A - Endless band steel, its welding method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously carry out a series of operations of laser cutting, abutting of cut end faces, and laser welding of the abutting end faces with respect to band steel such as a band saw blade. SOLUTION: This is such a welding method with respect to a band steel BS that a series of processes is continuously carried out, namely, (a) process for bending the band steel BS annularly and superposing its one end on the other in the width direction, (b) process for continuously cutting the one end and the other of the band steel BS by a laser beam, (c) process for abutting and pressurizing the cut end faces, and (d) process for welding the abutting faces by means of the same laser machining head 73. The device is so structured that it is equipped with a first clamp device 5 capable of holding the band steel BS, a second clamp device 7 movable in the Y-axis direction orthogonal to the X-axis at a position adjacent to the first clamp device 5, and the laser machining head 73 capable of cutting and welding the band steel BS held by the first and the second clamp device 5, 7, and moving in the Y-axis direction and that the first clamp device 5 can be moved in the X-axis direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless strip and a method and apparatus for welding the same.
The present invention relates to a band saw blade as a band material and a welding method and apparatus therefor.

[0002]

2. Description of the Related Art Heretofore, in order to weld a band saw blade as a band material endlessly, the band saw blade is cut by a cutting machine, and the cut end faces are butted and joined by flash butt welding. In this flash butt welding, the molten metal is extruded to the outer periphery and generates large burrs,
There is a problem that secondary processing such as grinding is required to remove the burrs.

In recent years, attempts have been made to join the band saw blade endlessly by laser welding.

[0004]

By the way, in butt welding by laser, a gap of about 10% of the plate thickness is limited, but strictly speaking, it is actually more severe depending on the processing speed. is there. When laser welding is performed after laser cutting, the laser cutting is a pre-processing for welding, and thus requires finishing accuracy. Therefore,
Great care must be taken when the cutting and welding steps are performed by separate laser machines.

[0005] Actually, in the cross section of laser cutting, a joining surface having a high joining accuracy required for laser welding cannot be obtained, or the joining surfaces at both ends of the strip do not coincide. In addition, the welding line shifts and the time variation of the laser beam is added, so that when welding is performed in a separate process and then fixed and later re-welded, the right and left joint surfaces are strictly Since it is not easy to see the coincidence, the processing accuracy is not maintained, and dents and grooves are formed on the welding joint surface.
There is a problem that a so-called undercut or underfill occurs to cause insufficient welding strength or defects.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an invention according to a first aspect of the present invention is to butt a cut end face cut by a laser beam in an endless strip. The endless strip is configured to be joined by laser welding.

According to a second aspect of the present invention, the band material formed endlessly is a band saw blade, which is cut at a position avoiding the tip of the tooth of the band saw blade, and the cut end faces are butted and joined by laser welding. This is a band saw blade having a configuration as described above.

According to a third aspect of the present invention, there is provided a method for welding a band material, wherein the band material is curved in a ring shape, and one end side of the band material and an appropriate position of the trunk or the other end side are formed in the band material. (A) step of appropriately overlapping in the width direction of (a), and continuously cutting one end side of the strip and an appropriate position or the other end side of the body by a laser beam emitted from a laser processing head (b) The steps of (c) abutting and pressing the cut end surfaces cut by the laser beam and (d) performing laser welding of the butted cut end surfaces using the same laser processing head are continuously performed. This is the method of welding the strip.

According to a fourth aspect of the present invention, there is provided a first clamp device capable of gripping a strip, and a second clamp device movable in a Y-axis direction orthogonal to the X-axis at a position adjacent to the first clamp device. And a laser processing head capable of laser cutting and welding the strip held by the first and second clamp devices and capable of moving in the Y-axis direction, wherein the first and second clamps are provided. This is a strip welding apparatus in which one of the apparatuses is appropriately movable in the X-axis direction.

According to a fifth aspect of the present invention, in the strip material welding apparatus according to the fourth aspect, a cutting receiver is provided between the first and second clamping devices so as to be movable in the Y-axis direction. is there.

According to a sixth aspect of the present invention, there is provided the strip welding apparatus according to the fifth aspect of the present invention, further comprising a seal gas ejection part for injecting a seal gas into the strip in a part of the cutting receiver.

The invention according to claim 7 is the invention according to claim 4, 5 or 6, wherein the band material is a band saw blade.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention include:
A case in which a band saw blade as an example of a band material is welded in an endless manner will be exemplified, but the band material may be a simple band material or a hoop material.

Referring to FIG. 1, a welding apparatus 1 for welding a band saw blade BS as an example of a band material endlessly includes a base 3, and the base 3 is provided with the band saw blade BS. A first clamp device 5 and a second clamp device 7 that can be gripped are mounted.

The first clamping device 5 has a slide base 11 which is movable in the X-axis direction along a guide member 9 provided on the base 3 in the X-axis direction. A platen 13 for clamping and supporting the band saw blade BS is mounted horizontally, and a backrest 15 for abutting and positioning the back of the band saw blade BS is provided movably in the X-axis direction along a guide in the X-axis direction. It is.

Further, a bracket 17 is erected on the slide base 11, and the swing arm 2 is supported by the bracket 17 via a pivot 19 so as to be able to swing up and down.
A pressing member 23 for pressing and fixing the band saw blade BS to the surface plate 13 is swingably pivoted at a tip end of the base member 1 via a hinge pin 25. A hydraulic cylinder 27 is mounted on the slide base 11 to swing the swing arm 21 up and down. The piston rod (not shown) that can move up and down in the hydraulic cylinder 27 is attached to the swing arm 21. Are linked as needed.

A hydraulic cylinder 29 as an example of a reciprocating device for reciprocating the slide base 11 in the X-axis direction along the guide member 9 is mounted on the base 3. In FIG. 1, a piston rod (not shown) reciprocally movable in the X-axis direction and the slide base 11 are appropriately connected.

Further, in order to regulate the amount of movement of the slide base 11 in the X-axis direction, a rod 33 penetrating a bracket 31 erected on the base 3 so as to be movable in the X-axis direction is connected to the slide base 11. In the vicinity of the end of the rod 33, a stopper 35 capable of abutting on the bracket 31 is attached so as to be adjustable in position.

The second clamping device 7 is arranged adjacent to the first clamping device 5 so as to be aligned in the X-axis direction. The second clamp device 7 includes a slide base 39 movable along a Y-axis direction guide member 37 provided on the base 3 adjacent to the first clamp device 5. A platen 41 for clamping and supporting the band saw blade BS is horizontally mounted on the top, and a side backrest 43 for abutting and positioning the back of the band saw blade BS is provided movably along a guide in the X-axis direction. is there.

Further, a bracket 45 is erected on the slide base 39, and the swing arm 4 is supported by the bracket 45 via a pivot 47 so as to be able to swing up and down.
A pressing member 51 for pressing and fixing the band saw blade BS to the surface plate 41 is pivotally connected to a tip end of the base 9 via a hinge pin 53 so as to be swingable.

In order to swing the swing arm 49 up and down, a fluid pressure cylinder 55 is mounted on the slide base 39. In this fluid pressure cylinder 55, a vertically movable piston rod (not shown) is provided. The swing arm 4
9 as appropriate.

One of the reciprocating devices for reciprocating the slide base 39 in the Y-axis direction along the guide member 37.
A fluid pressure cylinder 57 as an example is mounted on the base 3, and a piston rod 57 </ b> R reciprocally movable in the Y-axis direction in the fluid pressure cylinder 57 is appropriately connected to the slide base 39.

The movement of the slide base 39 in the Y-axis direction is regulated, and the position is adjusted so that the second clamp device 7 is accurately aligned with the first clamp device 5 in the X-axis direction. A position adjusting mechanism 59 is provided. More specifically, an adjusting screw 63 with which the slide base 39 abuts on the distal end is screwed to a bracket 61 erected on the base 3 so that the position can be adjusted in the Y-axis direction.

A guide member 65 extending in the Y-axis direction is provided between the first and second clamping devices 5 and 7,
On this guide member 65, a cutting receiver 67 for supporting the protruding portion of the band saw blade BS clamped by the first and second clamping devices 5 and 7 from below is provided movably in the Y-axis direction.

As shown in FIG. 2, the cutting receiver 67
It has a groove with an opening on the upper side, and at one end side of the cut receiver 67, a seal gas jetting portion 69 for jetting a sealing gas such as an inert gas to the band saw blade BS from below is provided. In order to move the cutting receiver 67 in the Y-axis direction along the guide member 65, a piston rod 71R that can reciprocate in the Y-axis direction in the hydraulic cylinder 71 mounted on the base 3 and the cutting receiver 67 are appropriately mounted. Connected to.

In order to perform laser cutting and laser welding of the band saw blade BS clamped by the first and second clamping devices 5 and 7, a laser processing head 73 is provided at an upper position facing the cutting receiver 67. It is provided so as to be movable in the axial direction and to be vertically adjustable. This laser processing head 7
Since 3 is a general configuration, a detailed description of the laser processing head 73 will be omitted.

In the above configuration, when the slide base 39 of the second clamp device 7 comes into contact with the adjusting screw 63, the backrest 15 of the first clamp device 5 and the side Hit 43
The adjusting screw 63 is adjusted in advance so that and are linearly and accurately aligned in the X-axis direction.

Now, as shown in FIG. 1, the first clamping device 5 and the second clamping device 7 have the band saw blade B in the Y-axis direction.
When the position of the band saw blade BS is in contact with the backrest 15 of the first clamp device 5 when the position of the band saw blade BS is in a state of being largely displaced more than the width dimension of S, and the end of the band saw blade BS is in the second clamp device. It is set on the surface plate 13 so as to slightly protrude to the side 7 and is pressed and fixed by the pressing member 23.

Then, the band saw blade BS is curved in an annular shape (loop shape), and the trunk portion of the band saw blade BS is appropriately overlapped in the width direction when the band saw blade BS is extremely long. As an embodiment, it is set on the surface plate 41 of the second clamp device 7 and fixed by the pressing member 51. in this case,
The back of the band saw blade BS is in contact with the side backrest 43 of the second clamp device 7. That is, as shown in FIG. 3, the band saw blade BS moves in the width direction (Y
(Axial direction).

As described above, when the band saw blade BS is gripped and fixed by the first and second clamping devices 5 and 7, the tip portions of the teeth T at one end and the other end of the band saw blade BS are as shown in FIG. As shown, it is set so as to avoid the cutting position L by the laser processing head 73. Since the cutting position L is substantially at the center of the groove width of the groove in the cutting receiver 67, the band saw blade may be set so that the tooth tip is not located at the center of the groove, so that the setting operation is easy. . The bottom of the gullet portion G between the teeth T of the band saw blade BS is the cutting position L.
It is desirable to set it so as to match. With this setting, the band saw blade BS is laser-cut and laser-welded at the bottom of the gullet, and a band-saw blade laser-welded at the bottom of the gullet G is obtained.

As described above, after setting and clamping the band saw blade BS in the first and second clamping devices 5 and 7, the laser processing head 73 is linearly moved in the Y-axis direction. Perform laser cutting. At this time, it is desirable to use an inert gas as an assist gas to prevent oxidation of the cut surface. Further, the spatter or the like blown downward during laser cutting does not enter the groove of the cutting receiver 67 and scatter around.

After performing laser cutting of the band saw blade BS, the fluid pressure cylinder 57 is operated to move the second clamping device 7 and the band saw blade BS in the direction of arrow A, and the slide base 39 is brought into contact with the adjusting screw 63. When the positioning is performed, the cut end faces EF at both ends of the band saw blade BS accurately face each other in the X-axis direction. Thereafter, when the fluid pressure cylinder 29 is operated to move the first clamping device 5 and the band saw blade BS in the direction of arrow B, the cut surfaces ES of the band saw blade BS abut each other.

At this time, the cut end faces ES at both ends of the band saw blade BS
Are continuously laser-cut by the same laser beam emitted from the laser processing head 73 that moves linearly, so that the cut end faces at both ends have the same shape. Are exactly matched to

As described above, the cut end faces ES at both ends of the band saw blade BS are butted, and the seal gas jetting portion 69 of the cut receiver 67 is moved below the butting portion. Then, the laser processing head 73 is vertically adjusted. Laser welding of the butt portion by linearly moving the laser processing head 73 in the Y-axis direction along the cutting position L by setting appropriate welding processing conditions by changing the focal position or changing the output. It is.
At this time, the laser processing head 73 and the laser gas
The sealing gas such as an inert gas is jetted from 9 toward the welding portion, and laser welding is performed in a state where oxidation is prevented.

As described above, while the band saw blade BS is clamped by the first and second clamping devices 5 and 7, laser cutting is performed by the laser processing head 73, and the first and second clamping devices 5 and 7 perform laser cutting. Since the cut end faces are butted while being clamped, the cut end faces can be butted with high accuracy, and the next laser welding can be reliably performed. That is,
Since a series of operations of laser cutting of the band saw blade BS, butting of the cut end surfaces, and laser welding of the butted cut end surfaces are continuously performed, laser welding of the band saw blade can be performed accurately and efficiently.

The present invention is not limited to the above-described example,
The present invention can be implemented in other aspects by making appropriate changes. For example, a configuration in which the second clamp device is moved not only in the Y-axis direction but also in the X-axis direction is also possible.

[0037]

As can be understood from the above description, the invention according to the first aspect is, in the endless strip material, a structure in which the cut end faces cut by the laser beam are butted and joined by laser welding. Therefore, the heat-affected zone due to welding is narrowed, and no large burrs are generated due to the projection of the molten metal, so that an endless strip having a large bonding strength is obtained.

According to a second aspect of the present invention, the band material formed endlessly is a band saw blade. The band material is cut at a position avoiding the tip of the tooth of the band saw blade, and the cut end faces are joined together by laser welding. With this configuration, the heat affected area is narrow, and the band saw blade has no burrs due to the rise of the molten metal.

According to a third aspect of the present invention, there is provided a method for welding a band material, wherein the band material is curved in a ring shape, and one end of the band and an appropriate position of the body or the other end are connected to the band. (A) step of appropriately overlapping in the width direction of (a), and continuously cutting one end side of the strip and an appropriate position or the other end side of the body by a laser beam emitted from a laser processing head (b) The steps of (c) abutting and pressing the cut end surfaces cut by the laser beam and (d) performing laser welding of the butted cut end surfaces using the same laser processing head are continuously performed. Since the method is a method for welding a strip, it is possible to perform high-precision butting after cutting the end face of the strip, and to easily perform continuous laser welding.

According to a fourth aspect of the present invention, there is provided a first clamp device capable of gripping a strip and a second clamp device movable in a Y-axis direction orthogonal to the X-axis at a position adjacent to the first clamp device. And a laser processing head capable of laser cutting and welding the strip held by the first and second clamp devices and capable of moving in the Y-axis direction, wherein the first and second clamps are provided. Since one of the devices is configured to be movable in the X-axis direction, a series of operations of laser cutting of the end of the strip, butting of the cut end faces, and laser welding of the butted cut end faces are continuously performed. The laser welding of the strip can be performed efficiently.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, a cutting receiver is provided between the first and second clamping devices so as to be movable in the Y-axis direction. Even when an appropriate assist gas is jetted from the laser processing head at the time of laser cutting, it is possible to prevent spatter and the like from scattering on the lower side of the band material.

According to a sixth aspect of the present invention, in the invention according to the fifth aspect, a seal gas ejection portion for injecting a seal gas into the band material is provided in a part of the cutting receiver.
The welding can be performed while preventing oxidation in an inert gas atmosphere.

According to a seventh aspect of the present invention, in the fourth, fifth or sixth aspect of the present invention, since the band material is a band saw blade, laser cutting of the band saw blade, butting of the cut end faces, and laser welding are easily performed. Is what you can do.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view showing the overall configuration of a welding device.

FIG. 2 is a perspective explanatory view of a cutting receiver.

FIG. 3 is an explanatory diagram for explaining laser cutting, butting of cut end faces, and laser welding of a band saw blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding apparatus 3 Base 5 1st clamp apparatus 7 2nd clamp apparatus 11, 39 Slide base 13, 41 Surface plate 23, 51 Pressing member 67 Cutting receiver 69 Seal gas ejection part 73 Laser processing head

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Noriaki Hashimoto, Inventor 1705-3 Kako, Inami-cho, Kako-gun, Hyogo

Claims (7)

[Claims] 1. In an endless strip material,
An endless strip having a configuration in which cut end faces cut by a laser beam are butted and joined by laser welding. 2. A band material formed endlessly is a band saw blade, which is cut at a position avoiding the tip of a tooth of the band saw blade, and the cut end faces are butted and joined by laser welding. Characteristic band saw blade. 3. A method for welding a strip, comprising: (a) bending the strip in an annular shape, and connecting one end of the strip and an appropriate position of the trunk or the other end to the width direction of the strip; A process of appropriately overlapping the
(B) a step of continuously cutting one end of the strip and an appropriate position or the other end of the body by a laser beam emitted from a laser processing head; (c) abutting cut end faces cut by the laser beam; Pressurizing, and (d) laser welding the butted cut end faces using the same laser processing head. 4. A first clamp device capable of gripping a strip, and X at a position adjacent to the first clamp device.
A second clamp device movable in the Y-axis direction orthogonal to the axis, and a laser capable of laser cutting and welding the strip held by the first and second clamp devices and movable in the Y-axis direction; A band material welding apparatus comprising: a processing head; and one of the first and second clamping devices is configured to be movable in an X-axis direction as appropriate. 5. The method according to claim 4, wherein:
A strip welding device comprising a cutting receiver movably in the Y-axis direction between the second clamp devices. 6. The strip welding apparatus according to claim 5, further comprising a seal gas jetting part for jetting a seal gas to the strip in a part of the cutting receptacle. 7. The strip welding apparatus according to claim 4, wherein the strip is a band saw blade.