JPH11267856A - Squeezing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a squeezing device, which can carry out side roll driving, side roll opening/closing, and water cooling of the inside of the roll at the same time, and further can reduce the holding cost of the devices to be equipped for every product size. SOLUTION: In this squeezing device, a side roll shaft 2 and a driving force transmitting shaft 3 are engaged by a worm gear system, and a worm gear engaging part 6 and bearing parts 2A, 2B of the side roll shaft are movably supported in the direction of the driving force transmitting shaft. A water passage 4 extending from the bottom end to the inside of the side roll 1 is installed inside the side roll shaft, and a rotary joint 5 for supplying/discharging water to the water passage 4 is connected to the bottom end of the side roll shaft. Furthermore, the side roll shaft is divided into the upper and lower parts, and both divided ends are connected via a rubber packing 11 by a gear coupling 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeeze apparatus, and more particularly, to a squelp (a steel strip as a tube material) heated to a warm temperature range, formed into a tube, and then heats and presses and joins the skelp edge. The present invention relates to a squeezing device that can advantageously perform pressurization in a pipe forming process.

[0002]

2. Description of the Related Art Conventionally, welded steel pipes are roughly classified into forged pipes and electric resistance welded pipes. Forged pipes, skelp was continuously heated in a heating furnace at 1350
After heating to 11400 ° C., forming into a tube (open tube) having a V-shaped open portion with a forming roll, and further heating the edges forming both ends of the open portion with the heat of oxidation by oxygen blowing. The pipe is made in the process of pressing and joining the tip with a forging roll. In general, a pair of two-hole rolls is used as the forged rolls, and cooling water is constantly applied to the rolls in operation from outside to prevent thermal damage. Since the forged pipe is heated to 1350 ° C. or more, even if the forged roll is cooled, the forged pipe does not become so cold that it cannot be forged.

On the other hand, an electric resistance welded tube is formed by continuously forming a skeleton at room temperature into an open tubular shape by a molding device, and heating the edges forming both ends of the open portion to a temperature range of a melting point or higher by high frequency to a temperature range above a melting point. , V are formed in a step of pressing and joining at the tip of the squeezing device. The squeezing device is generally formed by supporting a pair of left and right hole-shaped rolls with a housing. The roll may not be driven in principle, but is driven when there is an inconvenience such as a tube being twisted due to insufficient transport force. In this case, a bevel gear system is generally used for transmitting the driving force.

[0004]

SUMMARY OF THE INVENTION Forged pipes have a low pipe making speed.
Although the productivity is high as fast as 300 m / min or more, since it is heated to a high temperature of 1350 ° C or more, the scale tends to remain on the skelp edge, so the strength of the seam is considerably inferior to that of the base material and the scale on the pipe surface It cannot be applied to high-grade steel pipes that require strength reliability and surface quality, such as JIS STK, because they are formed and have poor surface texture.

[0005] Since the ERW pipe is formed at room temperature, it has good seam quality and surface texture, and is used for high-grade steel pipes. However, a weld bead with a large seam formed by melting and pressing a skelp edge is used. Since it is necessary to cut the material online, the pipe forming speed can be increased only up to about 100 m / min, resulting in poor production efficiency. These problems are invented by the present inventors. After heating the skelp to a warm temperature range (for example, around 600 ° C.) where the amount of scale generation is small, the skelp is formed in the same manner as an ERW pipe, and the edges are welded to a large size. According to a new pipe forming method (temporary name of ERW type solid-state pressure welding pipe forming method) in which high-frequency heating is performed to a temperature range lower than the melting point where no bead is generated and pressure and bonding are performed, this can be solved all at once.

However, in this new pipe forming method, since an open pipe in a warm temperature range is pressurized by a squeezing device, the roll shaft bearing is heated to a temperature exceeding the usable temperature due to heat conduction from the roll in contact with the high-temperature skeleton. As a result, the pressurization accuracy is deteriorated and the quality of the seam is deteriorated. In order to prevent this, water cooling of the rolls is necessary, but when performing external water cooling, unlike the case of forged pipes, the cooling water applied to the skelp lowers the skelp temperature, and the edge part is directly below the melting point by high-frequency heating Therefore, it is difficult to maintain the temperature in the temperature range where solid-state pressure welding is possible, so that internal water cooling must be performed.

Further, in order to minimize the swelling of the seam due to the pressurization, it is necessary to provide a hole type roll which presses the seam simultaneously with the pressurization. In addition, assuming that the pipe is conveyed with the seam portion facing upward, a hole-shaped roll pressing the seam portion is referred to as a top roll, and left and right hole-shaped rolls of the squeezing device are referred to as side rolls. This top roll also requires internal water cooling for the same reasons as the side rolls. In order to avoid leakage of high-frequency current that heats the edge, a ceramic roll, which is an insulator, should be used for the top roll, but the ceramic roll can be manufactured with a throat diameter (diameter at the bottom of the hole of the hole-type roll). To the upper limit (25
0mm φ). Thereby, the side rolls are also dimensionally restricted. That is, in order to receive the pressing force of the top roll evenly with the side rolls and synchronize the pressing (upset) from the left and right with the pressing of the seam portion, the top roll and the side rolls are positioned on the same plane on the roll axis. The lines need to be laid and have the same throat diameter. As described above, the throat diameter of the side roll has an upper limit, and water cooling inside the roll is indispensable to ensure roll durability.

In order to stabilize the seam quality, the side rolls are driven, and the horizontal distance between the side rolls is changed so that the displacement (upset) corresponding to the pressure can be adjusted while driving the side rolls. It is requested that it be possible. On the other hand, with the diversification of steel pipe products, it is necessary to cope with high-mix low-volume production, which requires replacement and use of squeeze equipment of the appropriate size for each product size. Although it is necessary to have as many squeeze units as possible, it is required to reduce the number of squeeze units because of the high cost of owning them.

[0009] The conventional squeezing apparatus cannot simultaneously satisfy these requirements. As described above, in the conventional squeezing device, the transmission of the driving force is performed by a bevel gear system. In the bevel gear system, the left and right side roll shafts and the left and right driving force transmission shafts are orthogonally aligned in the same plane, and the intersection of the two shafts is gear-coupled by a bevel gear. The gear coupling portion is provided at one of the upper and lower ends of the side roll shaft,
From the above request, there is no choice but to provide it below because there is a top roll above and no space. But then,
The installation space for the rotary joint, which is an essential member for cooling the inside of the roll, is eliminated.

[0010] Conventionally, the side roll shaft is integrally formed. Therefore, when changing rolls in response to a change in product size, the universal joint that connects the driving force transmission shaft and the drive source such as a motor must be disengaged and the entire squeeze device must be replaced. There is no room to reduce. Thus, in the conventional squeeze device, the side roll drive, the side roll opening and closing,
Since it is extremely difficult to simultaneously perform water cooling inside the roll, there has been a problem in that it is difficult to stabilize the seam quality of the product by the electric resistance solid-state pressure welding tube method, and that the durability of the roll is low. In addition, since the entire squeeze device must be held for each product size, there is a problem that the device holding cost is high.

Therefore, the present invention provides a squeezing device that can simultaneously perform side roll driving, open and close the side rolls, and water-cool the inside of the rolls, and further reduce the cost of holding the devices to be aligned for each product size. Aim.

[0012]

A first aspect of the present invention is that a pair of left and right side rolls, a side roll shaft that forms a rotation axis of each side roll and extends below the side rolls, and that the two side rolls are provided at the downwardly extending portions. In a squeeze device having a driving force transmission shaft that transmits a driving force by engaging with a roll shaft, a side roll shaft and a driving force transmission shaft are engaged by a worm gear system, and the worm gear engagement portion and the side roll shaft A bearing part is movably supported in the driving force transmission axis direction, and a water passage extending from the lower end to the side roll inside is provided inside the side roll shaft, and a rotary joint for supplying and discharging the water passage is provided at the lower end of the side roll shaft. A squeezing device characterized by being connected.

In order to engage the side roll shaft and the driving force transmission shaft by a worm gear system, a worm wheel may be fitted to the side roll shaft, and a worm meshing with the worm wheel may be fitted to the driving force transmission shaft. . Also,
In order to support the engaged engagement portion so as to be movable in the axial direction of the driving force transmission shaft, the fitting between the worm and the driving force transmission shaft may be performed by spline fitting.

With this configuration, the phases of the driving force transmission shaft and the side roll shaft can be shifted (the axes of both shafts are not placed on the same plane), and the side roll internal cooling is provided below the side roll shaft. Space for installing the rotary joint, which is an indispensable member for supplying and draining cooling water, can be secured, and the side rolls can be opened and closed while rotating the left and right side rolls. The top roll can be disposed so as to be internally water-cooled with a space. Therefore, it is possible to secure the stable quality of the product pipe seam by the electric resistance welded solid-state pressure welding pipe method and improve the roll durability of the top roll and the side roll.

According to a second aspect of the present invention, in addition to the first aspect, the side roll shaft is vertically divided and both divided ends are connected by a gear coupling via a rubber packing. Device. As a result, when changing rolls in response to a change in product size, it is sufficient to replace only the upper part of the squeeze device including the upper part of the split side roll shaft, so only the upper part of the squeeze device is retained for each product size. The squeeze device can be greatly reduced as compared with the related art in which the entire squeeze device has to be replaced.

[0016]

FIG. 1 is a partially cutaway front view showing an example of a squeezing device according to the present invention. A pair of left and right side rolls 1 and 1, a side roll shaft 2 that forms a rotation axis of each side roll 1 and extends below the side rolls, and engages with both side roll shafts 2 and 2 at a portion extending below the side roll shaft 2. Although the point having the driving force transmission shaft 3 for transmitting the driving force is the same as the conventional one, the squeeze device of the present invention employs the side roll shaft 2
And the drive power transmission shaft 3 are engaged by a worm gear system instead of the conventional bevel gear system, and the worm gear engagement portion 6 and the bearing portions 2A and 2B of the side roll shaft 2 are connected in the axial direction of the drive power transmission shaft 3. Movably supported. The worm gear system uses a worm wheel 6 on the side roll shaft 2.
A, and a worm 6B meshing with the worm wheel 6A is fitted to the driving force transmission shaft 3, and the worm 6B is spline-fitted to the driving force transmission shaft 3. And can freely move along the driving force transmission axis direction (left-right direction).

The worm gear engaging portion 6 and the bearing portion 2A are connected to a lower frame.
70, the bearing 2B is held by the upper frame 71, respectively.
The upper frame 71 and the upper frame 71 are slidably held by the housing lower member 80 and the housing upper member 81, respectively, in a state in which the upper frame 71 and the upper frame 71 are engaged with each other so as to be able to interlock horizontally by uneven fitting.
It is pushed and pulled by the electric jack 8 on 81 and moves left and right with the lower frame 70. Therefore, the side roll can be opened and closed while the side roll 1 is driven to rotate. In addition, a pile member 90 having a cotter hole is provided on the upper surface of the housing lower member 80, while a through hole for the pile member 90 is formed in the housing upper member 81. By inserting the cotter 91 into the cotter hole, the housing lower member 80
The housing upper member 81 can be fixed on the above.

According to the worm gear system, the phase of the side roll shaft 2 and the driving force transmission shaft 3 can be shifted, and a space can be secured below the side roll shaft 2, so that the squeezing device of the present invention A water passage 4 extending from the lower end of the roll shaft to the inside of the side roll is provided, and a rotary joint 5 for supplying and discharging water to and from the water passage 4 is provided.
Can be connected to the lower end of the side roll shaft, so that side roll driving, side roll opening / closing, and water cooling inside the roll can be performed simultaneously.

Further, the side roll shaft 2 is divided into upper and lower parts, and both divided ends are connected by a gear coupling 12 via a rubber packing 11. This allows the upper and lower side roll shaft ends to be connected in a watertight manner, and is easy to separate. The divided upper portion is the housing upper member 81 via the bearing 2B and the upper frame 71, and the lower portion is the housing lower member 80 via the worm gear engaging portion 6, the bearing 2A and the lower frame 70. , Respectively.

In FIG. 1, reference numeral 9 denotes a ceramic top roll for pressing a seam portion suitable for carrying out an electric resistance type solid-state pressure welding tube method, and reference numeral 10 denotes a drive source (motor not shown) having one end of a drive transmission shaft. ) Is a universal joint. The top roll 9 is also provided with a water passage 4 for internal water cooling and a rotary joint 5. The top roll 9 is supported by a support mechanism (not shown) so as to be able to move up and down.

When changing rolls, the top roll 9 is retracted upward, the gear coupling 12 is released, the cotter 91 is removed, and the housing upper member 81 is pulled up above the housing lower member 80. Thus, the members (the side roll 1, the bearing 2B, the upper frame 71, etc.) held by the housing upper member 81 can be removed at a time. Since the lower part of the squeezing device including the worm gear engaging part 6 and the bearing part 2A can be used even when the product size changes, the amount of equipment held in accordance with the product size change is changed by removing the universal joint 10 and replacing the entire squeezing device This is about half of the conventional method, and the cost of owning the device is reduced by half.

[0022]

EXAMPLE A skeleton (strip) of 4.5 mm thick and 270 mm wide heated to 600 ° C. was heated at 600 ° C. at the solid-state joining temperature (about 450 ° C.) by high-frequency heating, with the edge shown in FIG. Squeeze equipment (side roll throat diameter = 250 mm
(φ) was used for continuous upsetting and joining to form a solid pressure welded tube. At this time, the transition of the roll temperature measured on the roll surface of the side roll and the roll shaft side was compared between the case where the cooling water was passed through the water passage at 51 / min and the internal water cooling was performed, and the case where the cooling water was not passed. As shown in FIG. The temperature was measured by pressing a contact thermometer against the surfaces of the left and right side rolls (roll surface) and the roll shaft portion near the base (roll shaft side). FIG. 2 shows the higher of the left and right temperature measurement data on both the roll surface and the roll axis side.

As shown in FIG. 2, the temperature of the roll surface with internal water cooling is suppressed to about 1/2 of that without internal water cooling, and the temperature on the roll shaft side is the upper limit of the usable temperature of the bearing. The temperature was able to be suppressed to 120 ° C, which is much lower than a certain 200 ° C.

[0024]

As described above, according to the present invention, when performing the ERW type solid-state pressure welding tube method, it is possible to simultaneously open and close the side rolls while rotating and driving and perform water cooling inside the rolls. The seam quality can be stably ensured, the roll durability is improved, and the cost of owning the apparatus for each product size is significantly reduced, so that there is an excellent effect that multi-product small-lot production can be advantageously promoted.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an example of a squeezing device of the present invention.

FIG. 2 is a graph showing an example in which a rise in roll temperature is suppressed by internal water cooling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side roll 2 Side roll shaft 2A, 2B Bearing part 3 Drive power transmission shaft 4 Water passage 5 Rotary joint 6 Worm gear engaging part 6A Worm wheel 6B Worm 8 Electric jack 9 Top roll 10 Universal joint 11 Rubber packing 12 Gear coupling 70 Lower frame 71 Upper frame 80 Lower housing member 81 Upper housing member 90 Pile material 91 Cotta

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Kagawa 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Inside the Chita Works of Kawasaki Steel Corporation (72) Inventor Toshio Onishi 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki Inside the Chita Works, Steel Works (72) Inventor Yuji Hashimoto 1-1-1, Kawasaki-cho, Handa City, Aichi Prefecture Inside the Chita Works, Kawasaki Works (72) Inventor Ryoji Kusakabe 2-1-21-2 Muroya, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kusakabe Electric Co., Ltd.

Claims (2)

[Claims] 1. A pair of left and right side rolls, a side roll shaft that forms a rotation axis of each side roll and extends below the side rolls, and engages with both side roll shafts at the downward extension to transmit driving force. In a squeeze device having a driving force transmitting shaft, a side roll shaft and a driving force transmitting shaft are engaged by a worm gear system, and the worm gear engaging portion and a bearing portion of the side roll shaft are moved in the driving force transmitting shaft direction. A squeezing device characterized in that a water passage extending freely from the lower end of the side roll shaft to the inside of the side roll is provided inside the side roll shaft, and a rotary joint for supplying and draining the water passage is connected to a lower end of the side roll shaft. 2. The squeezing apparatus according to claim 1, wherein the side roll shaft is divided into upper and lower parts, and both divided ends are connected by a gear coupling via a rubber packing.