JPH0544312U - Multiple caliber rolls for multi-roll straighteners - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Regarding multiple caliber rolls for a multi-roll straightening machine that straightens metal tubes with different caliber by repeatedly bending them with selected calibers, To reduce the cost and to reduce the occurrence of caliber flaws when straightening metal pipes. [Structure] A single caliber ring in which a resin ring with a caliber is attached to the outer periphery of a metal ring, and a plurality of support plates having an outer diameter substantially equal to the outer diameter of the caliber ring are alternately passed through one roll shaft in a detachable manner. Then, the support plates are applied to both outermost surfaces, and the whole is tightened and at the same time fixed to the roll shaft. If the caliber wear is remarkable, remove only the caliber ring from the roll shaft, discard the resin ring, and repeatedly use the metal roll.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a plurality of caliber rolls for a multi-roll straightening machine, and more particularly to a roll adapted to eliminate the occurrence of caliber flaws when repairing a metal tube.

[0002]

[Prior Art]

 For example, when manufacturing a seamless steel pipe, a steel material is rolled to form a steel piece with a predetermined size, and the steel piece is perforated by the Mannesmann piercing method or hot extrusion press method to produce an element pipe. After that, sizing and reeling are performed, and then heat treatment is generally performed to manufacture a steel pipe as a product.

In the manufacturing process of such a steel pipe, since the steel pipe tends to bend due to the manufacturing method, a roll straightening machine, for example, straightening rolls having a plurality of calibers is arranged in a staggered pattern. The multi-roll straightening machine is used to select a caliber corresponding to the diameter of the steel pipe to be straightened, and the caliber repeatedly bends the steel pipe to straighten the shape of the steel pipe.

[0004]

[Problems to be solved by the device]

 However, in the conventional multiple caliber rolls for straighteners, the entire roll was made integrally from expensive metal materials such as SKD11, so if some caliber wear becomes noticeable, Since it is necessary to discard the entire roll including a small amount of calibers, there is a problem that the cost becomes high. In order to prevent this total disposal, rolls are manufactured by dividing them into calibers, and composite rolls that combine these are also used.

In addition, in the conventional multiple caliber rolls for straightening machines, steel pipes of slightly different dimensions may be straightened by the same caliber in setting the caliber dimensions for both the integrated roll and the composite roll, and such straightening is performed for a long time. If so, roll wear may cause a two-stage crossover, causing caliber flaws in the steel pipe. In particular, the above-mentioned problem has been remarkable in stainless steel pipes and the like after heat treatment, which have large bending and low hardness.

In view of the above problems, it is an object of the present invention to provide a plurality of caliber rolls for a multi-roll straightening machine that can eliminate the occurrence of caliber flaws and realize a low cost. .

[0007]

[Means for Solving the Problems]

 Therefore, the multiple caliber roll for a multi-roll straightening machine according to the present invention is a "roll of a multi-roll straightening machine for metal pipes, in which a single roll shaft has a resin ring with a caliber attached to the outer circumference of a metal ring. The caliber ring and a plurality of support plates having an outer diameter substantially equal to the outer diameter of the caliber ring are alternately and removably overlapped, and the support plates are applied to both outermost surfaces, and the whole is tightened and the roll is rolled at the same time. The main point is that it is fixed integrally with the shaft. "

Here, the ring may be made of metal, and for example, an inexpensive SS material can be used. Further, a synthetic resin material having desired characteristics such as heat resistance, abrasion resistance, and corrosion resistance, for example, MC nylon can be used for the resin ring.

[0009]

[Action]

 In the present invention, since the resin ring with the caliber is attached to the outer peripheral surface of the metal ring, even if the roll wear is caused by the long-term use and the caliber has two stages, the resin ring Due to the material of the ring, the caliber elastically deforms and adheres to the metal pipe, and the metal pipe is completely free of caliber flaws. Moreover, since both sides of each resin ring are supported by the supporting plates, the shape of the caliber during the straightening of the metal tube is maintained and the straightening action is not impaired.

In addition, when a plurality of caliber rings having resin calibers of different dimensions are arranged on the outer circumference of the roll shaft in the axial direction and are detachably attached, wear of some calibers becomes noticeable. First, the ring with the caliber is replaced, and it is not necessary to discard the entire roll.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 to 10 show one embodiment of the present invention, which is applied to a roll of a two-plane multi-roll straightening machine. As shown in FIG. 1, the two-plane straightening machine 1 has a first roll row 10 for repeatedly bending a steel pipe 6 in a vertical plane to straighten it, and a second roll row 10 for continuously straightening it in a horizontal plane. Each of the roll rows 10 is composed of a plurality of caliber rolls 2 arranged in a zigzag pattern in the steel pipe feed direction A at a predetermined pitch.

As shown in FIG. 2, each of the caliber rolls 2 has a plurality of single caliber rings 8 and support plates 7 alternately and removably inserted and superposed on the outer periphery of the roll shaft 4 so as to overlap with each other. Also, the support plate 7 is applied, the nut 42 is screwed onto the male screw 41 of the roll shaft 4, and the ring-shaped projection 40 is used to tighten the whole body, and at the same time, the nut 42 is fixed integrally with the roll shaft 4. . When the caliber roll 2 is mounted on the straightener 1, the roll shaft 4 is supported by a bearing on the side of the straightener 1, and the sprocket of the roll shaft 4 is connected to a drive source by a chain.

Further, each single caliber ring 8 has a size corresponding to the diameter of the steel pipe 6 to be straightened by fixing the synthetic resin ring 5 to the outer circumference of the metal ring 3 and to the outer circumference of each synthetic resin ring 5. The caliber 51 is formed. The metal ring 3 is manufactured using a steel material, for example, an inexpensive SS material, and a key groove 30 is formed on the inner peripheral surface of the metal ring 3. On the other hand, a detent key 40 is formed on the outer peripheral surface of the roll shaft 4, and the ring 3 is detented with respect to the roll shaft 4 by fitting the detent key 40 and the key groove 30.

Further, a detent key 31 is fixed to the outer peripheral surface of the metal ring 3 by a bolt 32 every 90 degrees, and a key groove 50 is formed on the inner peripheral surface of the synthetic resin ring 5 every 90 degrees. By fitting the key groove 50 and the detent key 31, the synthetic resin ring 5 is detented against the metal ring 3. Here, the ring 5 is made of a synthetic resin material such as MC-901, and a long cylindrical member having an inner diameter equal to the outer diameter of the metal ring 3 is manufactured. It can be manufactured by cutting it to a size, but of course, it may be directly manufactured to have an inner diameter equal to the outer diameter of the metal ring 3 and a width equal to the width of the metal ring 3. Further, the ring 5 may be directly molded instead of being fitted onto the outer circumference of the metal ring 3.

The support plate 7 is made of a steel material, for example, SS material, and has a ring shape having an outer diameter substantially the same as the outer diameter of the synthetic resin ring 5 and an inner diameter the same as the outer diameter of the roll shaft 4. It is manufactured. A key groove 70 is formed on the inner peripheral surface of the support plate 7, and the support plate 7 is prevented from rotating with respect to the roll shaft 4 by fitting the key groove 70 and the rotation preventing key 40 of the roll shaft 4. Has been done.

Next, the function and effect will be described.

When straightening the bending of the steel pipe 6, it is sufficient to send the steel pipe 6 to the caliber 51 of the roll row 10 corresponding to the outer diameter of the steel pipe 6. Then, the straightening rolls 2 arranged in a zigzag pattern repeatedly on the steel pipe 6. Bending is applied to correct the bending of the steel pipe 6.

At this time, since the portion of the caliber 51 is made of a synthetic resin material, even if the caliber 51 has two stages due to roll wear due to long-term use, the synthetic resin ring As a result of the elastic contact of the steel pipe 5 with the steel pipe 6, the steel pipe 6 is not calibrated at all.

Further, if the caliber 51 is simply formed on the surface of the synthetic resin ring 5, there is a concern that the caliber 51 is elastically deformed during the correction and the steel pipe 6 cannot be repeatedly bent in a predetermined manner. However, in the caliber roll of the present embodiment, since both sides of the synthetic resin ring 5 are supported by the metal support plates 7, the caliber shape during straightening of the steel pipe can be maintained and the repetitive bendability of the steel pipe 6 is ensured. Thus, the function of the straightener 1 can be guaranteed.

Further, in the conventional caliber roll for a multi-roll straightening machine, when the wear of a part of the caliber became remarkable, it was necessary to discard the entire roll including the caliber with less wear. In the example caliber roll, the metal ring 3 and the synthetic resin ring 5 constitute a single caliber ring 8, the single caliber ring 8 and the support plate 7 are set, and a plurality of sets are press-fitted onto the roll shaft 4. As it has an assembled structure, if caliber wear becomes noticeable, remove the set from the roll shaft 4 and discard only the synthetic resin ring 5, and attach a new synthetic resin ring 5 to the metal ring 3. The metal ring 3 and the support plate 7 can be repeatedly used, and as a result, a large cost reduction can be achieved.

[0021]

[Effect of the device]

 As described above, according to the plurality of caliber rolls for the multi-roll straightening machine according to the present invention, a single caliber ring in which a resin ring with a caliber is attached to the outer periphery of a metal ring and a plurality of supporting plates are alternately provided. The roll shaft is detachably inserted and overlapped, and the support plates are applied to both outermost surfaces to fix them together, so it is possible to prevent the occurrence of cover defects while ensuring the corrective function, and at a low cost. There is an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a multi-roll straightening machine having a plurality of caliber rolls according to an embodiment of the present invention.

FIG. 2 is a front view showing the overall configuration of the caliber roll.

FIG. 3 is a side view showing a main part of the caliber roll.

FIG. 4 is a plan view showing a main part of the caliber roll.

FIG. 5 is a side view showing a metal ring of the caliber roll.

FIG. 6 is a plan view showing the ring.

FIG. 7 is a side view showing a synthetic resin ring of the caliber roll.

FIG. 8 is a front sectional view showing a main part of the synthetic resin ring.

FIG. 9 is a side view showing a support plate of the caliber roll.

FIG. 10 is a front sectional view showing the support plate.

[Explanation of symbols]

1 2 Plain straightener 2 Caliber roll 3 Metal ring 5 Synthetic resin ring 51 Caliber 6 Steel tube 7 Support plate 8 Single caliber ring

Claims (1)

[Scope of utility model registration request] 1. A roll for a multi-roll straightening machine for metal pipes, comprising a single caliber ring 8 in which a resin ring 5 with a caliber 51 is attached to the outer circumference of a metal ring 3 on one roll shaft 4, and the caliber ring. Alternately, a plurality of support plates 7 having an outer diameter substantially equal to the outer diameter of 8 are removably passed through and overlapped, and the support plates 7 are also applied to both outermost surfaces, and the whole is fastened and at the same time integrated with the roll shaft 4. Multiple caliber rolls for a multi-roll straightening machine characterized by being fixed to.