JP2812781B2 - Swivel molding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial application field The present invention relates to a roll stand row for continuously forming a metal strip, a driving device therefor, and a welding apparatus for welding an edge of the formed metal strip. TECHNICAL FIELD The present invention relates to a forming apparatus capable of substantially eliminating a roll changing operation accompanying a change in a forming dimension in a forming mill including various kinds of metal working apparatuses.

An object of the present invention is to maintain the operating rate of a molding apparatus at a high level, particularly under conditions of high-mix low-volume production.

(B) Prior art In the case of continuously forming metal strips in a row of roll stands, for example, when changing the outer diameter, etc.
The operation of the forming device must be paused in order to convert all or part of the roll. In order to shorten the stop time, the following various countermeasures have been conventionally implemented.

Adoption of open-top type stand structure Adoption of pull-out type stand housing Adoption of stand batch exchange type reassembly method Each of the above can be used to a certain extent to shorten the equipment stoppage when changing the molding dimensions. However, it also has disadvantages.

 The advantages and disadvantages are summarized below.

Features of open-top type stand structure As shown in FIG. 1 (a), the upper part of the roll stand has an open-head type structure, and when exchanging rolls, the upper part is opened and rolls are taken in and out from here by a crane or the like.

In this method, since the roll changing operation is performed while the roll stand row is set on the pass line through which the metal strip passes, there is a limit to the effect of shortening the changing time.

For example, in the case of a row of roll stands for producing a steel pipe having an outer diameter of 10 inches or more, it is not uncommon that the change time per operation may be several hours.

Furthermore, after reassembly, the initial setting of the rolls to readjust each roll to a state in which continuous operation can be performed is prolonged, and material loss occurs due to repeated test operations during this time, and the yield loss is avoided accordingly. I can't. However, this law requires dedicated staff and spare stands for changing rolls,
It is the most economical in that no extra roll is required.

Features of pull-out type stand housing As shown in FIG. 1 (b), the roll stand has a divided structure of the work side and the drive side, and when changing rolls, only the work side is moved to the work side and pulled out of the roll shaft. Then roll in and out.

In this method, the roll change is performed in the pass line of the metal strip. Therefore, there is a limit to the reduction of the reassembling time, and at the time of initial setting of the roll after the reassembly, a material loss occurs due to several test operations, and the yield is reduced.

However, this method is economical in that it does not require dedicated personnel for roll change, a spare stand, and spare rolls.

Features of the stand batch replacement type reassembling method As shown in FIG. 1 (c), apart from the row of roll stands operating in the pass line, the standby is performed with the rolls incorporated in the spare roll stand. This and the roll stand in the pass line are replaced collectively.

Conventional stand methods include a method of replacing one roll stand at a time, a method of replacing a group of roll stand rows and their beds by lifting them with a crane, etc., and mounting a roll stand row on a bed carriage. There is a variety of methods, such as a method of carrying in and out on a track, a structure in which a removable inner roll stand can be inserted into the inside of a stand frame, and replacing only the inner roll stand when changing dimensions.

This method has the greatest effect of reducing the roll change time and the adjustment time. However, spare rolls and roll stands, exchange heads, exchange carts, inner roll stands, and the like are required, and equipment costs increase accordingly. In addition, there are disadvantages such as the necessity of extra dedicated personnel for performing these offline maintenance.

(C) Problems to be solved by the invention Recently, metal products (for example, steel pipes) have been developed with the advancement of industry
Are increasing (mainly outer diameter and thickness), and production lots are rapidly being subdivided. Furthermore, against the background of the growing need for short delivery times in the market, producers have to cope with multiple roll cycles, and this situation has further accelerated the division of production lots. As a result, most existing mills suffer from a significant decrease in mill availability due to a sharp increase in the number of roll changes, resulting in a mill availability of 50%.
The example of interrupting is no longer uncommon at present.

An important issue in the future for addressing this problem of inefficient production is, of course, schedule-free production lines. An object of the present invention is to provide a metal strip forming apparatus capable of exhibiting the following effects in order to fundamentally solve this problem.

First, there is a substantial omission of the roll change work.Secondly, the adjustment time required for the initial setting of the rolls and the yield loss due to the trial operation are minimized. This eliminates the need for holding a spare stand, exchange cart, roll, inner stand, and the like.

(D) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

Various types of metal processing apparatuses for continuously processing a metal strip on each surface of the rotary bed by supporting a rotary bed having a rotation center parallel to a fixed pass line through which the metal strip passes by a support device. A set of forming mills, each consisting of one type, and a row of forming mills mounted on each side of the rotating bed as a whole,
Further, the center lines of all the forming mills are arranged on a circular orbit whose radius is the distance from the center of rotation of the rotary bed to the fixed pass line of the metal strip, and the axis of the drive shaft of all the forming mills is set at the center of rotation. From the path to the pass line on a circular orbit, and the rotary bed is rotated to stop the pass line of any one of the forming mills in line with the pass line of the metal strip. Each of the forming mills is arranged on a rotary bed at a position where the axis of the drive shaft of the forming mill also coincides with the axis of the power shaft that drives the forming mill, and also serves as a power source.

More specifically, in a metal strip forming apparatus, when unwinding a coil of a metal strip and sequentially processing the product cross section, a plurality of rods parallel to a fixed pass line passing through the strip and around a rotating shaft formed of a parallel rod are used. A work bed surface is assembled, the work bed surface is supported by a support device for the rotation shaft, and the work bed surface is rotatable, and a disk gear forming a part of the rotation bed is connected from a fixed position that does not interfere with the rotation of the work bed. A rotating device having another drive disk gear for rotating the
A fixing device for locking the rotating bed after the rotation of the rotating bed is stopped, and mounted on a work bed surface of each of the rotating beds,
A roll stand row for continuously forming a metal strip in its longitudinal direction, a distribution gear for driving the roll, a drive shaft commonly connected to the roll stand, and various metal working devices including a welding device. A plurality of rows of forming mills sequentially arranged in accordance with the process, and an arbitrary fixed to a position not in contact with the rotating orbits of the rotary bed and all the forming mills and set on a pass line on the rotary bed Assembling from a power source having a power shaft capable of driving a drive shaft of one forming mill, and a clutch mechanism coupled to the power shaft side to connect or disconnect the driving shaft of the forming mill and the power shaft. In particular, all the rolling mills mounted on the rotary molding machine are provided with a roll center line that rotates the rotary bed. The core of the drive shaft, which rides on a circular orbit having a radius equal to the distance from the center to the fixed path line of the metal strip and rotates the rolls of the forming mill, is also fixed from the rotation center of the rotary bed to the power shaft. Is arranged on a rotary bed having a radius equal to the distance to the axis of the rotary bed, and further, the center line of any forming mill coincides with the fixed pass line of the metal strip by rotating the rotary bed. When stopped at the position, the driving source is arranged at a position corresponding to the fixed axis position of the driving shaft of the forming mill and the power shaft, whereby any rotation can be performed by merely rotating the rotary bed. The center line of one forming mill coincides with the pass line of the metal strip, and at the same time, the drive shaft of the forming mill and the power system of the power source The above-mentioned rotary forming apparatus for continuously forming a metal strip capable of connecting and disconnecting both shafts by a clutch mechanism by aligning both shaft cores of the shaft.

(E) Embodiment The problems to be solved and means to be solved by the present invention are as described above. Next, the configuration of the embodiment shown in the attached drawings will be described.

An embodiment applied to an electric resistance welded tube mill in which a metal strip is continuously roll-formed and an edge portion is welded to produce a tube will be described with reference to the drawings. FIG. 2 is a perspective view of the swing forming apparatus, and FIG. 3 is a cross-sectional view showing a positional relationship between a row of roll stands and a driving device of the swing forming apparatus of FIG. FIG. 4 is a plan view of the swivel forming apparatus according to the present invention, FIG. 5 is a side view in a direction parallel to the pass line, FIG. 6 is a lock pin for fixing the swivel bed at a predetermined position, and FIG. 5 is a side view A, and FIG. 8 is a side view B of FIG.

In FIG. 2, 1 is a metal strip, and 2 is a fixed pass line passing therethrough. Reference numeral 3 denotes a rotating shaft of the swing forming apparatus according to the present invention, which is located parallel to the pass line of the metal strip, and reference numeral 4 denotes a rotating bed assembled around the rotating shaft, which is supported by a supporting device 5.

In FIG. 5, the rotating bed is rotated by the driving of a rotating device 8 having another disk gear b7 connected to a non-driven disk gear a6 formed as a part thereof. In this example, the rotating device is fixed to the supporting device 5, but it may be arranged on another independent base that does not interfere with the rotation of the rotating bed.

In FIG. 5, in the present embodiment, the rotation bed 4 is reliably stopped by inserting the lock pin 10 into the keyhole 9 of the disc gear a6 from a fixed position. Good.

In FIG. 2, on each work bed surface of the rotary bed 4, an entrance guide device 23 for guiding a regular strip to a pass line, and the metal strip are continuously connected to the tubular body 11 are shown.
A roll stand row 13 holding a roll 12 having a hole shape for forming into, a welding coil 14 for heating and welding both edges of the tubular body, and a welding roll 15 for pressurizing a welding point, A bead cutting device 16 for cutting a weld bead, a pull-out stand 18 for guiding a tube 17 to be welded backward, and a turks head 21 for correcting a bend of the welded tube 17 if necessary. Each of the forming mills is arranged in this order, and further comprises a drive shaft 20 for connecting the rolls of the roll stand row 13 and the pull-out stand 18 to the distribution gear 19 and connecting them in common.
Row mounted.

The output transformer 22 connected to the welding coil is set at a position close to the power supply unit so as not to make physical contact with all the forming mills mounted thereon when the rotary bed rotates.

In FIGS. 5 and 8, the driving source for driving the rolls of one roll stand row on the rotary bed is installed at a position that does not interfere with the outer rotary trajectories of the rotary bed and all the forming mills mounted thereon. And a speed reducer 27 having one motor 25 and a power shaft 26. In this example, the power shaft 26 and the drive shaft 20 are formed of a metal strip pass line 2.
Although the axis is shared in parallel with the above, there is no problem even if the drive shaft 26 is arranged in the perpendicular direction.

In FIG. 5, a drive shaft 20 of any one of the forming mills, which is set on the metal strip pass line 2 by rotating a rotary bed, and a power shaft sharing the axis of the drive shaft 20
The clutch mechanism 28 for connecting / disconnecting to / from the drive shaft 26 uses the clutch gear 24 in this row.However, a method in which the spline mantle is moved in the axial direction of both shafts by a lever, or the drive shaft 20 and the power shaft The two ends of 26 may be connected by an intermediate universal shaft.

In FIG. 3, all the forming mills mounted on the rotating bed have a center line whose radius is the radius of the distance from the axis of the rotating shaft 3 of the rotating bed to the pass line 2 of the metal strip. Similarly, the axis of the drive shaft 20 is also placed on the drive shaft rotation drive 30 having a radius equal to the distance from the axis of the rotary shaft 3 to the axis of the power shaft 26, and the rotary bed is further rotated. To align the center line of any one forming mill with the pass line 2 of the metal strip and at the same time
The axis of the power shaft 20 and the axis of the power shaft 26 are also arranged at the same geometrical relationship position on the rotary bed, and the power source is also arranged. Therefore, the change of the molding size in the present apparatus is merely a rotation operation of the rotary bed 4 and a detachment by the clutch mechanism 28 of both the drive shaft 20 and the power shaft 26.

In the swing forming apparatus according to the present invention, the material of the metal material, the size and shape of the formed cross section, the difference in the welding method, and the like do not limit the originality of the present invention at all. In addition, the number of roll stand rows on the rotating bed can be increased or decreased, the welding device including a welding coil, a welding roll, and a bead cutting device, and a pull-out stand, a tursk head, and the like can be deleted. The present invention also includes a row of swivel forming apparatuses to which a swivel forming apparatus according to the present invention is added at the rear, comprising a row of stands whose purpose is only the sizing of pipes. In addition, this also includes dividing the drive shaft 20 and dividing the drive shaft 20 for each roll stand or grouping each of them, and attaching a motor, a speed reducer, and the like to each.

(F) Operation of the Invention In the rotary molding apparatus configured as described above, if a molding mill for processing different molding dimensions is mounted on the rotary bed, any rotation operation of the rotary bed can be performed. One forming mill can be selected on the pass line through which the metal strip passes, and at the same time, the driving shaft of the forming mill can be connected to the power shaft via the clutch mechanism, so that the forming dimensions can be changed easily and in a short time.

(G) Effects of the Invention The present invention is configured as described above, and thus exhibits the following effects. The first is the substantial deletion of the role change operation. When changing the outer diameter dimension, after cutting the metal strip on the pass line at the front of the swivel forming apparatus according to the present invention, the remaining material strip is discharged out of the pass line while the roll is jogged, After pulling out the clutch mechanism from the drive shaft with the operation button and separating it from the power shaft, release the lock pin, rotate the rotary bed 1/4 turn and set the center line of the new forming mill on the pass line of the metal strip. It is only necessary to connect the drive shaft and the power shaft again with a clutch. The downtime of the apparatus during this period is about 10 minutes or outside, and the roll changing work for changing the outer diameter is completely eliminated. By the way, in the existing ERW pipe mill,
The roll change time when changing the outer diameter is, for example, 2 to 3 hours for a 2 inch mill and 3 to 4 hours for a 4 inch mill.

A second advantage of the present invention is that the initial roll setting is substantially eliminated. The rolls of the roll stand row mounted on the rotary bed of the rotary forming apparatus according to the present invention are not removed except when an abnormality such as abrasion or damage occurs. Therefore, the ideal roll setting reached at the end of the previous operation is always preserved until the next use. As a result, the apparatus can be fully operated immediately with only a slight roll reduction adjustment for the thickness change. In addition, the production capacity will be increased by the increase in the mill operation rate. On the other hand, in the existing mill, for example, in the case of a 2 inch mill, the initial setting after the roll change requires about 0.5 to 1 hour, and a yield loss occurs during several trial runs during this time.

By the above first and second effects, the rotary forming apparatus according to the present invention is a substantially schedule-free mill capable of coping with the production of small lots and multiple sizes at a high operation rate.

In addition to the above, when the swivel forming apparatus according to the present invention is used, a dedicated staff for changing the roll is not required. Since the roll is not replaced except in the event of an abnormality such as breakage, the roll replacement is merely one of ordinary maintenance work. Further, for example, a spare stand, a spare roll, a spare bed, a spare cart, and the like that the existing mill must provide for shortening the roll changing time are not required.

[Brief description of the drawings]

1 (a), 1 (b) and 1 (c) are illustrations of various roll changing methods in an existing forming mill, and FIG. 1 (a) is a diagram showing roll changing of a forming mill having an open-top type stand structure. Fig. 1 (b) shows the situation of the roll exchange of the forming mill having the pull-out type stand housing, and Fig. 1 (c) shows the situation of the roll exchange of the molding mill when the stand batch exchange type is adopted. Is shown. FIG. 2 is an overall perspective view of an embodiment in which the swivel forming apparatus according to the present invention is applied to an electric resistance welded tube mill, and FIG. 3 is a view of a rotating bed, a rotating shaft, a roll stand, a pass line, a shaft of a drive shaft, and the like. It is sectional drawing explaining a geometrical positional relationship. FIG. 4 is a plan view of the swivel molding device according to the present invention, FIG. 5 is a side view in a direction parallel to the pass line, FIG. 6 is a lock pin for fixing the swivel bed at a predetermined position, and FIG. 5 is a side view A, and FIG. 8 is a side view B of FIG. DESCRIPTION OF SYMBOLS 1 ... Metal strip, 2 ... Pass line 3 ... Rotating shaft, 4 ... Rotating bed 5 ... Support device, 6 ... Disc gear a 7 ... Disc gear b, 8 ... Rotating device 9 ... Key Hole, 10 Lock pin 11 Upper pipe, 12 Roll 13 Roll stand row, 14 Welding coil 15 Welding coil 16, Bead cutting device 17 Pipe, 18 Pull-out stand 19: Distribution gear, 20: Drive shaft 21: Turks head, 22: Output transformer 23: Input guide device, 24: Clutch gear 25: Motor, 26: Power shaft 27 ... Reduction gear, 28 …… Clutch mechanism 29 …… Pass line rotation trajectory 30 …… Drive shaft rotation trajectory

Claims (1)

(57) [Claims] A rotary bed having a center of rotation parallel to a fixed pass line through which a metal strip passes is supported by a supporting device, and a metal strip is continuously processed on each surface of the rotary bed. A set of forming mills composed of various types of metal processing equipment is mounted one by one, and as a whole, an assembly is formed in which a row of forming mills is mounted on each surface of the rotary bed in a single row. The line is placed on a circular orbit whose radius is the distance from the center of rotation of the rotary bed to the fixed pass line of the metal strip, and the axis of the drive shaft of all forming mills is set to the distance from the center of rotation to the pass line. When placed on a circular orbit having a radius and rotating the rotary bed to stop the pass line of any one forming mill in line with the pass line of the metal strip, Relationship position the axis of the drive shaft of the forming mill is coincident with the axis of the power shaft for driving the pivoting molding device, characterized in that arranged each forming mill on a rotating bed and also serves as a power source.