JPH0596384A - Squeeze roll for welded tube - Google Patents

Abstract

PURPOSE:To manufacture a roll with a cooling path by casting a hollow tube in the inside of a squeeze roll for welded tube. CONSTITUTION:A hollow tube 15 is bent to the prescribed shape, blind caps are attached at both ends, and a cylindrical blank is manufactured by cost-in. This is machined and made to a working roll piece 1. A rotary joint 3 for supplying/ discharging the cooling medium is attached to the end part of the shaft center so as to be connected to the hollow tube 15. The cooling range and the cooling capacity can be adjusted due to the length and shape of the hollow tube 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeeze roll for a welded pipe, in which a metal strip is passed through a multi-stage roll stand and bent in the width direction thereof, and then both edges of the strip are heated and butt welded. In particular, it relates to one provided with a cooling device.

[0002]

2. Description of the Related Art Among strip plate forming rolls, a squeeze roll for welded pipes, in particular, comes into contact with a material to be heated which has been heated to a high temperature between both edges thereof for welding, so that the temperature of the material is increased as it is and seizure with a material to be treated And the tempering action impairs material performance such as wear resistance.
The largest squeeze roll is 350mm in diameter and width.
Some have a diameter of about 200 mm, but generally they are small with a diameter of 200 mm or less. Further, in resistance welding, in order to bring the contact shoe as close as possible to the welding point, it is required to reduce the diameter of the squeeze roll in order to improve the welding efficiency. As a solution to this heating of the roll, conventionally, water is poured over the entire weld including the squeeze roll, cooling water passages are provided in the squeeze roll body, and cooling water is allowed to flow through. It was adopted to increase the radiating area by increasing the radiant area and also to use a blast. However, when water is injected into the entire welded portion, performance and reliability due to oxidation of the welded portion are likely to remain, and the method of providing a cooling water passage according to the conventional method has a small roll piece and will be described later. As described above, since the cooling water passage is formed to prevent water leakage, the roll structure is complicated and large, and there are some cases where a sufficient cooling effect cannot be obtained due to restrictions on the processing for forming the cooling water passage. Further, when the outer diameter of the roll is increased and an air blast is also used, the outer diameter of the roll is restricted due to the relationship between the welding efficiency and the roll attachment device, and a sufficient cooling effect cannot be obtained. Figure 6
Shows a structural example (Japanese Patent Application Laid-Open No. 1-87013) in which a cooling water passage is provided by the above-mentioned conventional method. Since the entire roll forms the cooling water passage, the work roll piece 1 and the sleeve 2-1. , A ring 2-2, a cap 2-3 and a rotary joint 3, a partition plate 4 [see (b)], a large number of O-rings for sealing, plugs, bolts and other accessory parts, and a work roll piece. 1, the sleeve 2-1, the ring 2-2, and the cap 2-3 all require complicated processing such as end mill processing and drilling in order to form the cooling water passage. The cooling water is A
Flow through the passage of ~ K.

[0003]

As described above, the conventional roll with cooling water passages has a complicated structure and is practically impossible for a small squeeze roll.
Moreover, the size was unnecessarily increased, and the cooling effect was not sufficient. An object of the present invention is to provide a squeeze roll for a welded pipe, which has a novel manufacturing method and a cooling structure, which simplifies the structure, enhances the cooling effect, and can reduce the diameter.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a squeeze roll for a welded pipe, in which the two edges of a metal strip bent in the width direction are heated and butt-welded via a multi-stage roll stand. A squeeze roll for a welded pipe, characterized in that a cooling medium passage is easily formed by casting a hollow pipe around the inside thereof.

[0005]

The present invention is, to put it simply, in a welded pipe squeeze roll having a water-cooled structure, the roll having the conventional structure complicates the entire structure, and in particular, it cannot be practically applied to a small roll. In view of the above, it has been found that forming a hollow pipe in a roll can facilitate formation of a cooling water flow path. By adopting the roll of the present invention, the structure is greatly simplified, the processing cost,
The number of man-hours can be reduced, the size can be prevented from increasing, and the cooling capacity can be increased. JP-A-58-16229
The publication proposes a roll in which a cooling water passage is formed by casting a hollow pipe around the metal strip as a roll for cooling the metal strip uniformly in the width direction. However, the proposal is
In the conventional metal band cooling roll, the cooling water has a bypass flow other than a predetermined flow path in the roll body, paying attention to the fact that the cooling becomes non-uniform, and aims to prevent this, The metal strip cooling roll is larger than a squeeze roll for a welded pipe, and the roll structure cannot be particularly simplified by forming the cooling water flow path with a cast-in pipe. The material of the roll piece to be cast is whether or not the roll is a work roll, the difficulty of cast casting,
Although it is determined in consideration of the material of the hollow pipe and the required heat conductivity, wear-resistant copper alloy is suitable for the work roll piece, and specifically, a series of Alepco Metal (trade name) or similar material. There is one. The hollow pipe may be made of stainless steel or copper. On the other hand, when the cast roll piece is not a work roll, copper or a low alloy copper alloy is preferable. And, when the melting point is high, a stainless steel pipe is suitable as the hollow pipe. Copper pipes have excellent thermal conductivity and bend formability.

[0006]

The present invention will be described in detail with reference to the drawings of the embodiments.
1 to 5 show examples of squeeze rolls embodying the present invention. Each of the rolls shown in the drawings is formed as a hollow pipe 15 by bending it into a predetermined shape, is attached with blind lids at both ends, and holds the ends on one axis by pipe stays (not shown) that also serve as gas vents and rods on the circumference. Stay 1
The work roll piece 1 is formed by cutting a cylindrical material which has been cast and provided with 5 ', and a commercially available rotary joint 3 for supplying and discharging a cooling medium is attached to the end axis of the work roll piece 1. It is understood that the structure of each of these examples is extremely simplified, not to mention a long sentence. FIG. 3 shows the hollow pipe end with the cooling medium passage sleeve 16 having the cooling medium passages B and E and the rotary joint 3 attached thereto. The roll shown in FIG. 4 is obtained by casting a hollow pipe 15 inside a cooling ring 17 assembled so as to be in close contact with the work roll piece 1. In this figure, the roll piece 1 and the cooling ring 17 may be brought into direct contact with each other, or a soft steel plate or the like may be sandwiched to improve heat conduction. In the above-mentioned embodiment, FIG.
3 and the work roll piece 1 shown in FIG. 5 and the cooling ring 17 shown in FIG. 4 are made of wear-resistant copper alloy having good thermal conductivity, and the hollow pipe 15 is made of a copper pipe. The work roll piece 1 shown in FIG. 4 can be combined with the cooling ring 17 and a different material such as different cold die steel to further improve the wear resistance of the work roll piece and also to cool the work roll piece. It was possible. FIG. 6 is a view showing another type of hollow pipe that is cast and cast. In this example, a mating roll piece having two paths of water supply and drainage is required.

[0007]

As described above, the conventional method using a cooling water passage formed by cutting or the like has a complicated structure and a large size. As shown in FIG. In the case of a roll having a structure for rotationally supporting, the water leakage preventive device was not attached within the limited roll cross-sectional dimension, and the cooling water passage could not be configured, but the present invention prevents water leakage even with a roll having a small diameter. Internal cooling became possible. Also, by adjusting the length and shape of the hollow pipe to be cast, it is possible to freely adjust the roll cooling range and cooling capacity. In the case of the conventional method, it was necessary to pay attention to the use of a large number of O-rings and the machining accuracy of the structure as a water leakage prevention measure. However, in the present invention, since the cooling is performed through the hollow pipe, the structure is simple, The precision does not need to be particularly high.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a roll with a cooling device according to the present invention.

FIG. 2 is a diagram showing another embodiment of a roll with a cooling device according to the present invention.

FIG. 3 is a view showing still another embodiment of the roll with a cooling device according to the present invention.

FIG. 4 is a view showing still another embodiment of the roll with a cooling device according to the present invention.

FIG. 5 is a view showing still another embodiment of the roll with a cooling device according to the present invention.

FIG. 6 is a view showing another embodiment of the hollow pipe of the present invention.

FIG. 7 is a diagram showing an example of a conventional roll with a cooling device.

[Explanation of symbols]

 1 Work Roll Piece 2-1 Sleeve 2-2 Ring 2-3 Cap 3 Rotary Joint 4 Partition Plate 5-8 Halt 9-14 O-ring AK Cooling Path 15 Hollow Pipe 16 Sleeve for Cooling Path 17 Cooling Ring

Claims (2)

[Claims] 1. A welded pipe squeeze roll in which both edges of a metal strip bent in the width direction are heat butt welded through a multi-stage roll stand, and a hollow pipe is cast inside along the roll peripheral surface. A squeeze roll for a welded pipe characterized by facilitating the formation of a cooling medium flow path by wrapping around. 2. The squeeze roll for a welded pipe according to claim 1, wherein a roll piece having a roll caliber and a roll piece having a cooling medium flow channel, which are separately manufactured, have a closely assembled structure.