JPS6138776Y2 - - Google Patents

Description

[Detailed Description of the Invention] Generally, in the manufacturing process of steel strips, for example, cold-rolled steel strips are sequentially joined and sent to a subsequent process in order to improve productivity. Furthermore, in the steel strip finishing process, for example, reject portions of the cold rolled steel strip are cut off, and only the accepted portions are welded to match the coil unit weight required by the customer.

In this way, when joining steel strips,
It is done by TIG or MIG welding,
These welding methods deteriorate the welded part, especially the thermal effects of the base metal and the ductility of the weld metal, as well as the properties of these parts during rolling, and especially in the case of thin plates, burn-through occurs at the welded edge. occurs. For this reason, recently they are joined by laser beam welding. In this welding, the leading and trailing steel strips are fused or cut to form a new groove surface, and each of these steel strips is independently clamped and welded along the groove line between them. Welding is performed by running a laser beam. In this case, the laser beam is usually traveled by a traveling device as shown in Figure 1, but this traveling device has a problem with the straightness of the laser beam traveling line, and improvement is desired. There is.

That is, FIG. 1 is a front view of a conventional butt welding apparatus for steel strips, etc., and FIG. 2 is a longitudinal sectional view taken from the - line in FIG. 1. In FIG. 1, reference numeral 1 indicates a steel strip such as a thin plate, and this steel strip is fed in the direction of the arrow along a traveling line.

The leading steel strip 1 is positioned on the sliding table 6b with one side edge in contact with the reference surface of the side guide plate 2b, and in this state, the clamp piece 3b on the exit side is lowered to secure the rear end of the leading steel strip 1. Clamp the section onto the sliding table 6b.

Next, the leading end of the trailing steel strip 1 is cut with a scale shear or the like to form a butting surface, and one side edge is brought into contact with the reference surface of one of the side guide plates 2a, and the trailing end of the trailing steel strip 1 is A groove is formed therebetween, and in this state, one clamp piece 3a is lowered and clamped.

Next, each steel strip 1 on the leading side and the trailing side is held in a clamped state by, for example, the handle 7.
Activate the parallel adjustment mechanism, in particular, slide the sliding tables 6a and 6b left and right as shown in FIG. For example, the rotary table 8 is rotated around the rotary shaft 11 to align the butt groove line with the traveling line of the laser beam. Thereafter, a laser beam is run along the groove line to perform butt welding. For example, a U-shaped support stand 23 is attached to the running bed 24 as a reciprocating mechanism configured to freely move back and forth in the width direction of the steel strip 1, that is, approximately perpendicular to the running line 2, in the direction of the arrow in FIG. The support stand 23 is driven by a motor 25, and the laser beam 21 and torch 22 are attached to the tip of the support stand 23 facing downward.

However, in this traveling device, since the traveling bed 24 and the support stand 23 are joined by a dovetail groove and a sliding surface, clearance is required, and therefore, the straightness of the laser beam traveling line is expected to be highly accurate. It's tough. For this reason, it is possible to reduce the clearance and tighten the fit, but
In this case, since the running resistance increases, it is necessary to increase the running horsepower, and the output of the motor 25 increases. Basically, since the distance from the sliding surface to the welding torch is long, the accuracy of the sliding part is actually amplified and the straightness of the laser beam deteriorates. For example, board thickness
In order to weld thin plates of about 0.20 mm, the deviation between the butt groove line and the center of the laser beam must be 0.05 mm or less.

Therefore, even if the straightness of the shear cutting line is 0.03mm, the straightness of the laser beam travel line is 0.02mm.
Is required. Laser beam traveling speed 10m/
In order to achieve min, the clearance of the sliding part is 0.1 mm, the straightness of the laser beam travel line is 0.5 mm, and the conventional travel device is 0.20 mm.
The thin plates could not be welded.

The present invention aims to solve the above-mentioned drawbacks, and specifically, a welding torch that reciprocates in a direction approximately perpendicular to the running line of the steel strip, etc. is attached to one end of the running arm, and guide rails are installed on both sides of the running arm. We propose a laser beam traveling device in which these guide rails are supported by blocks via bearings.

Embodiments of the present invention will be described below with reference to the drawings.

In addition, FIG. 3 is a front view of a welding part of a butt welding device for steel strips etc. equipped with a traveling device according to one embodiment of the present invention, and FIG. 4 is a longitudinal cross-section on the - line in FIG. FIG. 5 is a sectional view taken along the line -- in FIG. 4, and FIG. 6 is a side view of the traveling device in FIG. 3.

First, in FIG. 3, reference numeral 1 indicates a steel strip such as a thin plate, and this steel strip is clamped by sliding tables 6a and 6b so that the groove line coincides with the laser beam traveling line.

Thereafter, the welding laser torch 22 is reciprocated approximately perpendicularly to the traveling line of the steel strip, etc., and welding is performed.

Next, the welding laser torch 22 is attached to one end of a traveling arm 31, as shown in FIG. It is configured to be movable.

Also, as a transmission mechanism for the driving force of this traveling arm 31, a gear rack 3 is provided on a part of the traveling arm 31.
4 and pinion 3 to this gear rack 34.
8 are engaged, and the pinion 38 is connected to the motor 32 via the reducer 33.

Next, guide rails 35a and 35b are respectively attached to both sides of the reciprocating traveling arm 31, and these guide rails 35a and 35b are connected to support blocks 37a and 37b via ball bearings and the like.
Supported by 37b. Therefore, during welding, by driving the motor 32, the gear rack 34 is operated via the reducer 33, and the traveling arm 31 integral with the gear rack 34 reciprocates. At that time, the guide rails 35 attached to both sides of the traveling arm 31
a, 35b are guided by guide bearings 36a, 36b attached to the respective support blocks 37a, 37b, so that the straightness of the traveling lines of the traveling arm 31 and the welding torch 22 is maintained with high precision.

That is, in FIG. 5, reference numeral 31 indicates a traveling arm, 32 a motor, 33 a reduction gear, 38 a drive pinion, and 34 a gear rack, and the gear rack 34 is integrated with the traveling arm 31. In addition, 35a and 35b are guide rails, which are also integrated with the traveling arm, and 36a and 36b are guide rails.
are guide bearings supporting blocks 37a, 37.
b, respectively, each guide rail 35
a and 35b to guide them.

Further, each support block 37a, 37b is pressed in the horizontal direction by the horizontal adjustment screw 39, thereby eliminating the gap between the guide bearings 36a, 36b and the guide rails 35a, 35b, and improving the straightness angle in the horizontal direction. Can be done.

In addition, the guide bearings 36a and 36b that support each guide rail do not necessarily have to be installed over the entire length of each support block, but it is necessary to install at least one each on each end of each support block. A total of at least 4 pieces are required. However, it is usually preferable to install eight in total as shown in FIG.

As explained above in detail, the present invention is constructed by attaching guide rails to both sides of a traveling arm to which a welding laser torch is attached, and supporting these guide rails by support blocks via ball bearings. Therefore, the straightness of the traveling line of the welding laser torch can be maintained at 0.02 mm or less, and it is therefore possible to butt weld thin plates (1 mm or less).

In addition, the use of guide rails reduces running resistance, and the running parts (welding laser torch,
Since the weight of the traveling arm, rack, and linear driving guide rail is small, the drive device can be made compact. By pressing the guide rail horizontally,
It can exhibit more straightness than the guide rail itself.

In addition to the above-mentioned running devices, this invention is applicable to general machines that require straightness of the running line, TIG or MIG.
It can be applied to traveling devices of welding machines and even laser fusing equipment.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional butt welding device for steel strips, etc., Fig. 2 is a vertical sectional view taken from the - line in Fig. 1, and Fig. 3 is a traveling device according to an embodiment of the present invention. 4 is a longitudinal sectional view taken along the - line of FIG. 3, FIG. 5 is a sectional view taken above the - line of FIG. 4, and FIG. FIG. 4 is a side view of the traveling device of FIG. 3; Code 1... Steel strip, 2... Running line, 2a...
Side guide, 2b...Side guide plate, 3a,
3b...Clamp piece, 6a, 6b...Sliding table, 7...Handle, 8...Rotary table, 9...
... Handle, 11 ... Rotating shaft, 21 ... Laser beam, 22 ... Welding torch, 23 ... Support stand, 24 ... Traveling bed, 25 ... Motor, 3
1...Traveling arm, 32...Motor, 33...Reducer, 34...Gear rack, 35a, 35b...
...Guide rail, 36a, 36b...Guide bearing, 37a, 37b...Support block, 38
... Drive pinion, 39 ... Horizontal adjustment screw.

Claims (1)

[Scope of utility model registration request] In a laser beam traveling device in which a welding laser torch reciprocates approximately perpendicular to the traveling line of the steel strips, etc. on a table on which a pair of steel strips, etc. to be butt welded is placed, one end of the welding torch is A laser beam comprising: a traveling arm that is attached to and travels; guide rails that are attached to both sides of the traveling arm; and support blocks that respectively support the guide rails via bearings. Traveling device.