JP3348603B2 - Shaft fixing device for pipe forming mill roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for fixing a pipe forming mill roll (hereinafter, simply referred to as a roll) fitted to a rotating shaft to the rotating shaft.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a shaft fixing device for a pipe forming mill roll in a conventional pipe forming mill stand. In FIG. 4, reference numeral 1 denotes a rotating shaft, which is rotatably supported between a pair of stands 2. Reference numeral 3 denotes a motor, which rotates the rotary shaft 1 via a power transmission device 4. 5 is a first fixed to the rotating shaft 1
Role. Reference numeral 6 denotes a fixed shaft fixedly held between the pair of stands 2 and the second roll 7 is rotatably supported by the shaft. Reference numeral 8.8 denotes a hydraulic cylinder, which presses the second roll 7 so as to maintain a gap between the first roll 5 and the second roll 7 at a desired value. First roll 5
The material is formed according to the shape of the gap by passing the material through the gap of the second roll 7. In this example, the peripheral surface of the first roll 5 is concave in cross section,
The peripheral surface of the roll 7 is convex in cross section.

In such a configuration, when the prime mover 3 rotates the rotary shaft 1 via the power transmission device 4 and inserts a material between the first roll 5 and the second roll 7, The material is drawn in as it rotates, and the second roll 7
The pipe forming is performed by also entraining.
Conventionally, a method of fixing a roll to a rotating shaft has been a method of interposing a tapered sleeve between the roll and the rotating shaft, a method of inserting a key between the roll and the rotating shaft, and the like.

FIG. 5 shows a conventional example in which a tapered sleeve is interposed. The roll fixing portion of the rotating shaft 1 is provided with an inclined portion with diameters on both sides being different from each other. When the roll 5 is mounted and fixed to the rotating shaft 1, a spacer 9 is fitted into the step of the rotating shaft, and after the roll 5 is fitted, a tapered sleeve 10 is provided between the rotating shaft 1 and the roll 5.
Is inserted, and the nut 12 is further tightened via the holding member 11. Thereby, the roll 5 is fixed to the rotating shaft 1.

[0005] However, in the above-mentioned configuration of the prior art,
There are the following problems. First, it requires several to several tens of roll changes per day, depending on the type of product to be pipe formed. Therefore, it is necessary to attach and detach the fixing member each time, and the replacement work is troublesome. Second, due to the large torque generated during operation,
The rotating shaft 1 and the tapered sleeve 10 are worn, and the roll 5 slides and plays, and in some cases, seizure may occur between the roll and the shaft. Third, the nut 12 pressing and fixing the tapered sleeve 10 is loosened by the torque and vibration during operation, and as a result, the tapered sleeve 10 is loose.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, in which the exchange of rolls is easy and the abrasion and loosening of the roll fixing member are eliminated. It is an object of the present invention to provide a shaft provided with a device for fixing a pipe forming mill roll, which is capable of improving the number of parts and reducing the cost by reducing the number of parts.

[0007]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. 2. The inner peripheral surface of a pipe forming mill roll having a swelling portion formed by hydraulic pressure on an outer peripheral portion of a rotating shaft, applying swelling pressure to the swelling portion and inserting the swelling portion into the swelling portion. To fix the pipe forming mill roll to the rotating shaft.

According to a second aspect of the present invention, an annular hydraulic chamber provided inside a bulged portion having a constant thickness along an outer peripheral surface of a pipe forming mill roll fixing portion of the rotating shaft, and one of the rotating shafts A hydraulic nipple for supplying hydraulic pressure, provided at an end of the hydraulic nipple, a hydraulic valve for holding or releasing the hydraulic pressure, and a hydraulic hole for communicating the hydraulic chamber with the hydraulic nipple and the hydraulic valve. In addition, hydraulic pressure is applied to the hydraulic chamber from the hydraulic nipple through a hydraulic hole to bulge the bulging portion and press against the inner peripheral surface of the pipe forming mill roll, thereby fixing the pipe forming mill roll to a rotating shaft.

According to a third aspect of the present invention, a spiral groove is provided on at least one of the pipe forming mill roll fixing portion of the rotary shaft and the inner peripheral surface of the pipe forming mill roll.

According to a fourth aspect of the present invention, spline teeth are provided on at least one of the fixed portion of the rotating shaft of the pipe forming mill roll and the inner peripheral surface of the pipe forming mill roll.

[0011]

Embodiments of the present invention will be described below in detail. FIG. 1 shows an embodiment of the present invention, in which 21 is a rotating shaft, and 21a is a roll fixing portion thereof. The roll fixing portion 21a is provided with an annular hydraulic chamber 23 inside a bulging portion 22 having a certain thickness along the outer peripheral surface. 24 is the rotating shaft 21
A hydraulic nipple, which is provided at one end of the nipple and is connected to a hydraulic hose (not shown) and supplies high-pressure hydraulic oil by a hydraulic pump (not shown), is tightened with hydraulic pressure applied. Is a hydraulic valve that holds the hydraulic pressure and releases it by releasing it, and a hydraulic hole 26 that communicates the hydraulic chamber 23 with the hydraulic nipple 24 and the hydraulic valve 25.

Next, a method of attaching and detaching the roll 5 to and from the rotating shaft 21 in the present invention will be described. Hydraulic valve 2 in advance
5 is loosened, and the roll 5 is inserted into the rotating shaft 21 and set on the roll fixing portion 21a. The inner diameter of the roll 5 is slightly larger than the outer diameter of the roll fixing portion 21a so that it can be easily inserted and removed. Then, when a hydraulic hose is connected to the hydraulic nipple 24 and high-pressure hydraulic oil is supplied, the hydraulic oil enters the annular hydraulic chamber 23 from the hydraulic nipple 24 through the hydraulic hole 26 and causes the bulging portion 22 to bulge. . The bulged portion 22 is brought into pressure contact with the inner peripheral surface of the roll 5 to be in a fixed state. Then, when the hydraulic valve 25 is tightened, the state where the hydraulic pressure is applied to the hydraulic chamber 23 is maintained, so the hydraulic hose is removed. When the roll 5 is removed, if the hydraulic pressure is released by loosening the hydraulic valve 25, the bulging portion 22 contracts and the roll 5 can be removed.

The shaft provided with the apparatus for fixing the pipe forming mill roll according to the present invention comprises an annular hydraulic pressure provided on the inner surface of the bulged portion 22 having a constant thickness along the outer peripheral surface of the roll fixed portion of the rotating shaft. A chamber 23, a hydraulic nipple 24 provided at one end of the rotary shaft for supplying hydraulic pressure, and a hydraulic valve 25 for holding or opening the state where the hydraulic pressure is applied;
The structure includes a hydraulic chamber 23, a hydraulic nipple 24, and a hydraulic hole 26 that communicates with the hydraulic valve 25.

In the above configuration, after the roll 5 is fitted into the roll fixed portion of the rotating shaft 21, hydraulic pressure is applied to the hydraulic chamber 23 from the hydraulic nipple 24 through the hydraulic hole 26, and the bulging portion 22 is bulged to roll. Press against the inner peripheral surface. Thereby, the roll 5 can be fixed to the rotating shaft. Also,
When replacing the roll 5, if the hydraulic valve 25 is loosened to release the hydraulic pressure, the swollen portion of the rotating shaft is reduced, and the roll 25 is rotated.
Can be easily removed.

In the case where a high torque is required, a spiral groove 31 is provided in the roll fixed portion of the rotating shaft or the inner peripheral surface of the roll as shown in FIG. 2, or as shown in FIG. It is also possible to provide spline teeth 32.

[0016]

As described above, the present invention has the following advantages. First, the work of replacing the pipe forming mill roll is facilitated, and the working time can be reduced.

Second, wear of the rotating shaft and the pipe forming mill roll is eliminated, so that generation of backlash and seizure can be prevented, and the life of the rotating shaft and the pipe forming mill roll can be extended. Further, reliability can be improved and cost can be reduced.

Third, the exchange of the roll 5 is extremely easy,
Work time is reduced. Also, depending on the torque during operation,
There is no abrasion of the rotating shaft 21 and the roll 5, so that there is no backlash and the occurrence of seizure can be prevented. Since there is no wear, the life of the rotating shaft 21 and the roll 5 is extended, and
Since the structure is simple, the reliability is high, the number of parts is reduced, and the cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a shaft including a device for fixing a pipe forming mill roll according to an embodiment of the present invention.

FIG. 2 is a view showing an example in which a spiral groove is provided in a roll fixing portion of a rotating shaft according to the present invention.

FIG. 3 is a diagram showing an example in which spline teeth are provided on a roll fixing portion of a rotating shaft according to the present invention.

FIG. 4 is a view showing an example of a pipe forming mill stand.

FIG. 5 is a diagram showing a conventional method of fixing a rotating shaft and a roll.

[Explanation of symbols]

 5 Pipe Forming Mill Roll 21 Rotary Shaft 21a Roll Fixed Part 22 Swelling Part 23 Hydraulic Chamber 24 Hydraulic Nipple 25 Hydraulic Valve 26 Hydraulic Hole

Continued on the front page (72) Inventor Tsuyoshi Sagawa 3-10-10 Tsukiji, Chuo-ku, Tokyo Nakamura Motor Co., Ltd. (56) References JP-A-7-164062 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21D 5/12 B21C 37/08 F16B 4/00 B21D 1/02 B21D 1/05 B21D 3/05

Claims (4)

(57) [Claims] An oil pressure bulge is provided on an outer peripheral portion of a rotary shaft, and the bulge is swelled by applying hydraulic pressure to an inner peripheral surface of a pipe forming mill roll inserted into the bulge. An apparatus for fixing a shaft of a pipe forming mill roll, wherein the shaft is pressed and fixed to the rotating shaft. 2. An annular hydraulic chamber provided inside a bulging portion having a constant thickness along an outer peripheral surface of a pipe forming mill roll fixing portion of the rotary shaft, and an annular hydraulic chamber provided at one end of the rotary shaft. A hydraulic nipple for supplying hydraulic pressure, a hydraulic valve for holding or releasing a hydraulic pressure applied state, and a hydraulic hole for communicating the hydraulic chamber with the hydraulic nipple and the hydraulic valve; A pipe forming mill, wherein hydraulic pressure is applied to the hydraulic chamber through a hydraulic hole to swell the bulging portion and press against the inner peripheral surface of the pipe forming mill roll to fix the pipe forming mill roll to a rotating shaft. Roll fixing device. 3. The pipe forming mill roll shaft fixing according to claim 2, wherein a spiral groove is provided on at least one of the pipe forming mill roll fixing portion of the rotating shaft and the pipe forming mill roll inner peripheral surface. apparatus. 4. The shaft fixing of the pipe forming mill roll according to claim 2, wherein spline teeth are provided on at least one of the pipe forming mill roll fixing portion of the rotating shaft and the inner peripheral surface of the pipe forming mill roll. apparatus.