JP3321628B2 - Dimension measurement device of material in rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill for rolling a ring-shaped material in a radial direction and an axial direction by a main roll, a mandrel roll and a pair of axial rolls. The present invention relates to a dimension measuring device for measuring a dimension in a radial direction.

[0002]

2. Description of the Related Art A rolling device for producing ring-shaped products such as pipe flanges, gears, bearing races, etc. is provided with a main roll and a mandrel roll having different diameters, and a pair of axial rolls formed in a conical shape and opposed vertically. Rolling mills are known. In this rolling mill, the ring-shaped material is rolled in the radial direction (thickness direction) by bringing the mandrel roll inserted into the through-hole of the ring-shaped material close to the rotationally driven main roll. The ring-shaped material is rolled in the axial direction (height direction) by bringing the upper axial roll, which is positioned axially above the ring-shaped material, closer to the lower axial roll positioned on the lower side in the axial direction of the ring-shaped material. Is done.

[0003] When the ring-shaped material is rolled by the rolling mill, the diameter and height of the material change with time, and the upper and lower axial rolls are moved forward and backward in the radial direction of the material while following the change. It is necessary to move the upper axial roll up and down in the axial direction of the material. Therefore, the measuring roll disposed so as to always contact the outer peripheral surface of the ring-shaped material is moved as the diameter of the material increases, and the amount of movement of the roll is detected to calculate the material diameter. Then, based on the calculation results, the amount of axial roll advance / retreat and the amount of elevation are set.

[0004]

Since the measuring roll is configured to always contact the ring-shaped material being rolled, if the ring-shaped material is deformed into a distorted shape due to any cause during rolling, Due to the deformation, an excessive load is applied to the measuring roll. In this case, there is a problem in that a load is applied to the means for detecting the amount of movement of the measurement roll, the support mechanism for the measurement roll, and the like, causing a failure or breakage. In addition, it takes a long time to inspect a failed part or replace a damaged part, and it is pointed out that a disadvantage that the manufacturing efficiency is reduced is caused.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has been proposed in order to solve the problem suitably, and the occurrence of failure or breakage due to an excessive load applied to a measuring roll due to deformation of a ring-shaped material or the like. It is an object of the present invention to provide a dimensional measuring device capable of preventing the occurrence of an error.

[0006]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and appropriately achieve the intended purpose, the present invention provides a main roll that is driven to rotate, and a main roll that can be approached and separated from the main roll. A mandrel roll that is inserted through the center through hole of the ring-shaped material, and a lower axial roll positioned axially below the ring-shaped material and a lower axial roll positioned above the lower axial roll so as to be able to approach / separate from the lower axial roll. The main roll, the mandrel roll, and a pair of axial rolls perform rolling in the radial and axial directions of the ring-shaped material, and contact the outer peripheral surface of the ring-shaped material being rolled. In a rolling mill configured to detect the amount of movement of a measuring roll in contact with and measure a change in the radial dimension of the material, the center of the ring-shaped material being rolled is determined by A holding means movably disposed in the intersecting radial direction, and an operation in which the measuring roll is rotatably supported at one end which is movably disposed with respect to the holding means and which faces the ring-shaped material. A shaft, an air cylinder disposed on the holding means, for urging the measurement roll to always contact the outer peripheral surface of the ring-shaped material via the operating shaft, and an air cylinder which always holds the holding means at a fixed position. A hydraulic cylinder that allows the holding means to move in a direction away from the ring-shaped material when an excessive load equal to or greater than a preset value is applied to the measuring roll.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a device for measuring the dimensions of a material in a rolling mill according to the present invention. FIG. 1 is a schematic perspective view showing an overall configuration of a rolling mill employing a dimension measuring device according to an embodiment, FIG. 2 is a front view showing a schematic configuration of a rolling mill according to the embodiment, and FIG. It is a top view which shows the schematic structure of such a rolling mill. In order to facilitate understanding, the main mechanisms constituting the rolling mill will be described first, and then the description of the dimension measuring device of the present invention will be described.

(Regarding Main Roll and Moving Table) As shown in FIG. 2, a vertical drive shaft 11 is rotatably arranged on a base 10 installed on the floor of a factory, and a drive extending to an upper part of the base. A large-diameter main roll 12 is provided at the upper end of the shaft 11 so as to be integrally rotatable. The lower end of the drive shaft 11 extending below the base is connected to a drive motor 14 disposed in a pit 13 formed on the factory floor via a speed reducer 15 (see FIG. 4). A pair of rails 16, 16 are laid on the upper surface of the base 10 with a predetermined distance therebetween with the main roll 12 interposed therebetween. A movable table 17 for a mandrel roll is slidable on the rails 16, 16. It is mounted on. As shown in FIG. 3, the moving table 17 is connected to a hydraulic cylinder 18 disposed on the base 10 facing between the rails 16, 16.
Is configured to reciprocate along. The moving table 17
Are formed in a shape that does not interfere with the hydraulic cylinder 18.

(Regarding the mandrel roll) As shown in FIG. 2, a column 19 is vertically provided on the left end of the movable table 17 (an end separated from the main roll 12). A projecting portion 20 extending horizontally to the right side (the side facing the main roll 12) is integrally formed. A vertical mandrel roll 23 is rotatably supported on the overhanging end of the overhang 20. The mandrel roll 23 hangs downward from the overhang portion 20 by a predetermined length, and is located on the opposite side of the hydraulic cylinder 18 with the main roll 12 interposed therebetween (rolling position). The mandrel roll 23 is set to a size that can be inserted into the center through hole 24a of the ring-shaped material 24 to be rolled (FIG. 11).
reference). The lifting cylinder 26 is provided on the upper surface of the overhang portion 20.
The mandrel roll 23 is raised and lowered by the cylinder 26 so as to raise and lower a rolling level allowing the loading and unloading of the ring-shaped material 24 to and from the rolling position and a rolling level inserted into the through-hole 24 a of the ring-shaped material 24. It is configured to be moved. In addition, the holder 2 for holding the lower end of the mandrel roll 23 is located at the rolling position
8 is disposed, and the mandrel roll 23 lowered to the rolling level has two upper and lower points sandwiching the ring-shaped material 24.
(The overhang 20, the holder 28). Then, when the hydraulic cylinder 18 is urged in the direction in which the piston rod extends in this state, the mandrel roll 23 approaches the main roll 12 and the ring-shaped material 24 is rolled in the radial direction. A supply unit and a discharge unit (both not shown) for supplying the ring-shaped material 24 are arranged on the side of the base 10 that intersects with the moving direction of the moving table 17.

(Regarding the moving frame and its forward / backward moving mechanism) On the upper surface of the base 10, the side opposite to the side where the mandrel roll moving table 17 is disposed (see FIG. Right), a pair of rails 29,2
9 are laid in parallel with a predetermined separation between the rails 1
6 and 16 extend in the same direction. The rails 29, 29 are provided with upper and lower axial rolls 30, 3, which will be described later.
The movable frame 32 on which the reference numeral 1 is disposed is slidably mounted. Further, a gate-shaped support base 33 is disposed and fixed to the base 10 opposite to the main roll 12 with the moving frame 32 interposed therebetween,
A nut 34 is rotatably supported on the support 33. As shown in FIG.
A ball screw 35 parallel to the extending direction of the ball screw 35 is screwed in, and a tip of the ball screw 35 facing the moving frame 32 is fixed to the frame 32 so as not to rotate. Further, a first servomotor 36 is provided on the support 33, and a gear 37 provided on an output shaft of the motor 36 is provided with a nut 34.
The gear 38 is fixed to the gear 38. That is, when the first servomotor 36 is driven in the forward and reverse directions, the axial roll moving frame 32 reciprocates along the rails 29, 29 under the screwing action of the nut 34 and the ball screw 35, and Of the axial rolls 30 and 31 with respect to the ring-shaped material 24 is adjusted.

The first servomotor 36 is provided with an encoder 39 serving as a rotation pulse generating means for detecting the rotation amount of the motor 36. The encoder 39 generates a pulse according to the movement amount of the moving frame 32. This pulse is input to the control device 40 (see FIG. 11). Further, the control device 40 includes the ring-shaped material 24.
It receives signals from encoders 68, 68 as rotation pulse generating means provided in measuring mechanisms 81, 82, which will be described later, for measuring the diameter of the motor, and calculates an appropriate moving amount of the moving frame 32 based on the number of generated pulses. Thus, the operation of the first servomotor 36 is set to be controlled. As a result, as the diameter of the ring-shaped material 24 changes due to rolling, the two axial rolls 30 and 31 are always positioned at appropriate positions (the imaginary vertex of the lower axial roll 30 is positioned on the axis passing through the center S of the ring-shaped material 24). Position).

(Regarding Lower Axial Roll) A lower axial roll 30 formed in a truncated cone shape is provided on the moving frame 32 on a center line P ₁ parallel to the rail 29 passing through the axial center of the main roll 12. The roll 30 is positioned such that its outer peripheral surface is in horizontal contact with the lower surface of the ring-shaped material 24 supplied to the rolling position (FIG. 11). reference). A motor 41 capable of variably controlling the rotation speed is provided on the moving frame 32, and the lower axial roll 30 is driven to rotate in a required direction by the motor 41.
When the diameter of the ring-shaped material 24 changes by rolling, the contact position between the material 24 and the lower axial roll 30 changes. In this case, the lower axial roll 30
Is a frusto-conical shape, the peripheral speed of its outer peripheral surface differs in the axial direction, and the peripheral speed of the contact position changes with the change of the diameter of the ring-shaped material 24, and the center S of the ring-shaped material 24
Deviates from the center line P ₁ , so that accurate rolling cannot be performed. Therefore, in the embodiment, the lower axial roll 30 is driven by the motor 41 in accordance with a change in the diameter of the ring-shaped material 24.
Of the rotational speed is variable, a constant peripheral speed of the contact position between the ring-shaped material 24 and the roll 30 is controlled so as to face the material center S always on the center line P _1.

(About the upper axial roll) Above the position of the lower axial roll 30 on the moving frame 32, an elevating body 42 is disposed so as to be able to move up and down. As shown in FIG. A tilting frame 43 is provided so as to be tiltable up and down with a pin 44 as a fulcrum. An upper axial roll 31 formed in a frustoconical shape and paired with the lower axial roll 30 is rotatably disposed on the tilting frame 43. Then, the upper axial roll 31 is moved closer (downward) to the lower axial roll 30 by driving a second servo motor 45, which will be described later, so that the ring-shaped material 24 positioned at the rolling position as shown in FIG. Axial rolls 3 are vertically arranged in the axial direction (height direction) on the opposite side of the rolling position by the main roll 12 and the mandrel roll 23 by 180 °.
0, 31 are pressed and rolling in the axial direction is performed.
The upper axial roll 31 is connected to a low-rotation motor 46 provided on the tilting frame 43 via a one-way clutch (not shown), and is always driven at a low rotation. . This is to prevent the upper axial roll 31 from contacting the ring-shaped material 24 in a stopped state during rolling of the ring-shaped material 24, thereby preventing the rotation of the material 24. When the upper axial roll 31 abuts on the ring-shaped material 24 and starts following rotation, the power transmission between the roll 31 and the low-rotation motor 46 is disconnected by the one-way clutch.

(Regarding the Elevating Body Moving Mechanism) A hydraulic cylinder 47 is vertically disposed and fixed on the elevating body 42, and a nut 48 is non-rotatably fixed to the tip of a piston rod 47a pointing upward. I have. And nut 4
8, a ball screw 49 rotatably supported by the moving frame 32 is screwed. Ball screw 49
A worm wheel 50 is fixed so as to be integrally rotatable. The worm wheel 50 meshes with a worm 51 that is driven to rotate by a second servomotor 45. Accordingly, when the second servomotor 45 is driven in the normal and reverse directions to rotate the worm wheel 50 and the ball screw 49 in the normal and reverse directions, the lifting body 42 moves up and down under the screwing action of the screw 49 and the nut 48. I do. As a result, the upper axial roll 31 disposed on the elevating body 42 is raised and lowered,
The rolling amount of the ring-shaped material 24 is adjusted. In addition, the hydraulic cylinder 47 functions as a safety device that, when an excessive load is applied to the upper axial roll 31 during the rolling operation, absorbs the load and prevents the lifting / lowering moving mechanism from being damaged. In FIG. 6, reference numeral 52 denotes an auxiliary cylinder for suspending and supporting the elevating body 42.

The second servomotor 45 is provided with an encoder 53 serving as a rotation pulse generating means for detecting the rotation amount of the motor 45. The encoder 53 generates a pulse in accordance with the lifting amount of the lifting body 42. This pulse is input to the control device 40. Further, the second servo motor 45 is provided with a lifting / lowering amount calculated from the pulse generation number input to the control device 40 from the encoders 68, 68 of the measuring mechanisms 81, 82, and the control device 40
The operation is controlled based on the final rolling shape (bevel shape) data that has been input to. Thus, the upper axial roll 31 can be constantly adjusted to a proper position as the diameter of the ring-shaped material 24 changes by rolling, and accurate rolling is achieved.

(About the tilting mechanism of the upper axial roll)
As shown in FIG. 6, a gear box 55 is pivotally supported by a bracket 54 disposed on the elevating body 42 so that the worm wheel 56 cannot move in the axial direction inside the gear box 55. It is arranged rotatable.
The center through hole formed in this worm wheel 56 has a screw
(Both not shown) are formed, and a ball screw 57 is inserted into this through hole so as to screw with the screw. An end of the ball screw 57 extending downward from the gear box 55 is connected to a rear end of the tilt frame 43 that is separated from a position serving as a tilt fulcrum. Furthermore,
A tilting motor 58 is provided in the gear box 55, and a worm 59 that is rotationally driven by the motor 58 meshes with the worm wheel 56. Accordingly, when the tilting motor 58 is driven in the forward and reverse directions to rotate the worm wheel 56 in the forward and reverse directions, the ball screw 57 is driven by the gear box under the screwing action of the screw of the worm wheel 56 and the ball screw 57. 55 and the tilting frame 4
3 tilts with the pin 44 as a fulcrum. Thereby, the inclination angle of the upper axial roll 31 with respect to the ring-shaped material 24 is adjusted, and the material 24 can be rolled into various shapes.

(Regarding the Dimension Measuring Apparatus for the Ring-shaped Material) A dimension measuring apparatus 80 for measuring the diameter of the ring-shaped material 24, which changes with time by rolling, is provided on the moving frame 32 for the axial roll. . The dimension measurement device 80, in a direction crossing the moving direction of the moving frame 32, and a pair of measuring mechanism 81 and 82 opposed to and disposed across the center line P _1. The measuring mechanism 81,
Since the configuration of 82 is symmetric, only the configuration of one measuring mechanism 81 will be described, and the same members of the other mechanism 82 will be denoted by the same reference numerals.

At the front end of the moving frame 32, a support housing 62 having a predetermined length crossing the moving direction of the frame 32 is provided so as to be movable in a direction crossing the moving direction of the frame. end away from the line P _1, as shown in FIG. 7, is arranged fixed to the movable frame 64 that is slidably mounted on the cam plate 63 disposed fixed to the base 10. That is, the support housing 62 and the moving frame 64 move integrally when the moving frame 32 moves by the driving of the first servomotor 36, and the moving direction of the moving frame 32 intersects with the moving direction of the frame 32. It is configured to be able to move in the direction of
An operating shaft 65 is slidably inserted into the inside of the support housing 62, and a ring-shaped material 2 is attached to a tip of the operating shaft 65 protruding from an end of the support housing 62 that faces the center line P _1.
A holding member 66 that rotatably supports a measurement roll 60 that can contact the outer peripheral surface of the rotation shaft 4 is provided, and can move integrally with the operation shaft 65. Further, as shown in FIG. 9, the rear end of the operating shaft 65 is connected to the air cylinder 6 disposed on the moving frame 64.
The cylinder 67 is urged in a direction in which the measuring roll 60 always comes into contact with the ring-shaped material 24 via the connecting member 83. The measurement roll 60 of the embodiment also serves as a centering roll for detecting the center S of the ring-shaped material 24 that changes with time due to rolling.

As shown in FIG. 8, the support housing 62
And a pinion 69 disposed on a shaft of the encoder 68 meshes with a rack 70 disposed on the operation shaft 65. The encoder 68 generates a pulse according to the amount of movement of the operating shaft 65, and the pulse is input to the control device 40. The controller 40 receives a pulse from the encoder 68 and controls the operation of the servo motors 36 and 45 based on the amount of movement of the moving frame 32 and the amount of elevation of the elevating body 42 calculated from the number of pulses generated. It is set to perform.

[0020] Here, the order to accurately measure the diameter of the ring-shaped material 24 by the measuring mechanism 81 and 82, as shown in FIG. 11, the center line P passing through the material center S and perpendicular to the center line P _{1 The} rolls 60 and 61 need to be brought into contact with the outer peripheral surface of the ring-shaped material 24 with the centers of the measurement rolls 60 and 61 facing the top of the ring-shaped material 24. However, when the diameter of the ring-shaped material 24 is rolled and the diameter thereof increases with time, and this is measured, and the moving frame 32 is moved, the moving frames 64, 64 are integrally formed with the movement of the frame 32. And the contact positions of the measurement rolls 60 and 61 with the material 24 are changed. In Accordingly example, moving the moving frame 64, 64 together with the moving frame 32, always the center of the measuring rolls 60 and 61, the follow-up to a position corresponding to the center line P ₂ passing through the center S of the material 24 extraordinary There is a circulating mechanism.

That is, as shown in FIG. 7, the cam frame 63 on which the moving frame 64 is slidably mounted has an inclined guide portion inclined at 45 ° with respect to the moving direction of the moving frame 32. 72a and a linear guide 7 parallel to the moving direction
2b, and a cam groove 72 made of
4 and a follower 71 rotatably supported on the lower surface of the cam groove 7.
2 is slidably fitted (see FIG. 8). Accordingly, as the moving frame 32 moves away from the ring-shaped material 24 at the rolling position, the follower 71 of the moving frame 64 moves along the inclined guide portion 72a of the cam groove 72, and the measuring roll 60 move away at an angle of 45 ° to the line P _1. Accordingly, the diameter by rolling on the center line P ₂ passing through the center S of the ring-shaped material 24 made over time increases, can be always face the centers of the metering roll 60 and 61, accurate ring-shaped material 24 Can be measured (see FIGS. 13 and 14).

(Regarding the safety mechanism in the measuring mechanism) A fixed frame 73 is disposed and fixed inside the movable frame 64, and is movable in the axial direction of the operating shaft 65 with respect to the fixed frame 73 as shown in FIG. The air cylinder 67 is provided on the holding frame 74 provided. A hydraulic cylinder 75 is disposed at an end of the holding frame 74 facing the bottom side of the air cylinder 67 in a direction opposite to the air cylinder 67. The piston rod 75a of the hydraulic cylinder 75 is
The cylinder 75 is set so as to be fixed to the fixed frame 73 so as to be immovable, and is always urged in the direction in which the piston rod 75a extends to hold the holding frame 74 at the fixed position shown in FIG. You. The operating shaft 65 and the air cylinder 67
Of the flange 83a to connector 83 for connecting the piston rod 67a is formed, the flange 83a has a required relative the front end 74a of the holding frame 74 facing the fixed position (side directed to the center line P ₁₎ They face each other with a gap. When the diameter of the ring-shaped material 24 is measured, the measuring roll 60 and the operating shaft 65 move within the range of the gap according to the change in the material diameter.

When the ring-shaped material 24 being rolled is deformed into a distorted shape and an excessive load is applied to the measuring roll 60, as shown in FIG. 10, the hydraulic cylinder body moves relative to the piston rod 75a. Moving (piston rod 75
a is drawn into the barrel), and the measuring roll 60 and the air cylinder 67 are released together with the holding frame 74 in a direction away from the ring-shaped material 24 to prevent the occurrence of a breakage accident. That is, the measuring roll 60 and the operating shaft 65 are deformed by the deformation of the ring-shaped material 24 so that the connecting tool 8
3 is larger than the gap between the flange 83a and the front end 74a of the holding frame 74, the flange 83a
Abuts on the front end 74a to move the holding frame 74 backward. At this time, the hydraulic cylinder 75 allows the holding frame 74 to move by releasing the hydraulic pressure to a reserve tank or the like.

[0024]

Next, the operation of rolling the ring-shaped material by the rolling mill according to the above-described embodiment will be described. Prior to the operation of the rolling mill, data such as the diameter and the axial dimension of the ring-shaped material 24 to be rolled and the bevel shape to be finally rolled are input to the control device 40. In the state of waiting for the rolling of the ring-shaped material 24, the mandrel roll 23 is waiting at an elevated level. Further, the moving frame 32 is retracted to a position where the dimension measuring device 80 allows the transport of the ring-shaped material 24 to the rolling position, and the upper axial roll 31 is waiting at the ascending position. The upper axial roll 31 is tilted and positioned at an angle corresponding to the bevel shape by driving the tilting motor 58 in advance.

When the ring-shaped material 24 is carried into the rolling position by the supply means, the mandrel roll 23 is lowered to the rolling level by the urging of the lifting cylinder 26,
The lower end is inserted into the holder 28. Further, the axial roll moving frame 32 moves forward by the driving of the first servomotor 36, and the lower axial roll 30 contacts the lower surface of the ring-shaped material 24 facing the rolling position, and the virtual vertex of the material 24 is It faces on the axis passing through the center S.
In this case, a pair of measurement rolls 60 and 61, as shown in FIG. 13, respectively brought into contact with the outer peripheral surface in a state where the face centered on the center line P ₂ passing through the center S in the ring material 24.

Next, the main roll 12 and the lower axial roll 30 are driven to rotate, and the hydraulic cylinder 18 is urged to move the mandrel roll moving table 17 along the rails 16, 16 to the rolling position. By moving the facing mandrel roll 23 close to the main roll 12, the rolling of the ring-shaped material 24 in the radial direction is performed. The upper axial roll 31 is lowered by the driving of the second servomotor 45 to pinch the ring-shaped material 24 between the upper and lower axial rolls 30, 31, whereby the material 24 is rolled in the axial direction.

The four rolls 12, 23, 30, 31
However, when the rolling of the ring-shaped material 24 is performed in the positional relationship shown in FIG. 12, the diameter of the material 24 increases with time,
The pair of measurement rolls 60 and 61 that are in contact with the outer peripheral surface of the ring-shaped material 24 are moved away from each other against the urging force of the air cylinders 67 and 67. This movement amount is detected by the corresponding encoders 68, 68,
A pulse corresponding to the movement amount is input to the control device 40. The control device 40 receives pulses from the encoders 68, 68, calculates the amount of movement of the moving frame 32 and the amount of elevation of the elevating body 42 from the number of generated pulses, and based on the amount of movement and the amount of elevation, Servo motor 36,
45 operation control is performed. That is, the first servomotor 36 is driven to move the moving frame 32 to the rails 29, 29.
Along the direction away from the ring-shaped material 24,
The lower axial roll 3 provided on the frame 32
The virtual vertex of 0 is coincident with the central axis of the material 24 whose diameter has changed. Further, the second servomotor 45 is driven to move the elevating body 42 up and down, and the upper axial roll 31
The material 24 is accurately moved up and down based on bevel shape data set in advance according to the diameter of the material 24. Therefore, accurate rolling is performed on the ring-shaped material 24, and a highly accurate product can be manufactured.

The moving frame 64, which moves with the movement of the moving frame 32, moves along the cam groove 72 formed in the cam plate 63 as described above. as shown in, always faces the position coincident with the center to the center line P ₂ passing through the center S of the ring-shaped material 24, it is possible to measure the exact diameter. Also,
Since the measurement rolls 60, 61 are urged by the air cylinders 67, 67, it is possible to quickly respond to changes in the diameter of the ring-shaped material 24. 13 and FIG.
In FIG. 4, the change in the position of the measurement rolls 60 and 61 is exaggerated for clarity.

When the rolling of the ring-shaped material 24 is completed, the mandrel roll moving table 17 moves forward and arrives at a desired position, and then the mandrel roll 23 rises to a rising level. Next, the one-time rolling operation is completed by unloading the rolled ring-shaped material 24 facing the rolling position by the discharging means. When the rolled ring-shaped material 24 is carried out of the rolling position, the next ring-shaped material 24 is carried into the rolling position by the supply means.

Here, the four rolls 12, 23, 3
Ring-shaped material 24 rolled by 0,31
However, if the shape is deformed into a distorted shape for some reason, an excessive load is applied to the measuring roll 60 (61). At this time, as shown in FIG. 10, the holding frame 74 in which the air cylinder 67 is disposed moves in the direction away from the ring-shaped material 24 to prevent an excessive load from being applied to the air cylinder 67. It is possible to prevent the occurrence of accidents such as breakdowns and breakage.

[0031] Note that, in the rolling of the ring-shaped material 24, if the number of pulses input to the controller 40 from the encoder 68, 68 are different, the center S of the ring-shaped material 24 from the center line P ₁ determines that the deviation, by variably controlling the rotational speed of the lower axial roll 30, a pulse always inputted from the ring-shaped material center S is allowed (both encoders 68, 68 coincides with the center line P ₁ of 24 Numbers match).

Although the embodiment has been described in connection with the case where the ring-shaped material measuring device is constituted by a pair of measuring mechanisms,
The present application is not limited to this. For example, the diameter may be measured by one measuring mechanism that abuts on the outer peripheral surface of the ring-shaped material opposite to the part rolled by the mandrel roll and the main roll. In the hydraulic cylinder, the cylinder itself may be disposed and fixed on a fixed frame, and the piston rod may be disposed and fixed on a holding frame. Further, in the embodiment, the case where the measurement roll also serves as the centering roll has been described, but it is also possible to provide both rolls separately.

[0033]

As described above, according to the apparatus for measuring the dimensions of a material in a rolling mill according to the present invention, the ring-shaped material is deformed into a distorted shape during rolling by any cause, and an excessively large amount is applied to the measuring roll. When a load is applied, the holding means itself, in which the air cylinder for urging the measuring roll is disposed, is allowed to move in a direction away from the ring-shaped material. Therefore, it is possible to prevent the means for detecting the moving amount of the measuring roll, the air cylinder, and the like from being damaged or damaged due to an excessive load. As a result, there is no loss time caused by inspection of a failed part or replacement of a damaged part.
Manufacturing efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an entire configuration of a rolling mill in which a dimension measuring device according to an embodiment is adopted.

FIG. 2 is a front view showing a schematic configuration of a rolling mill according to an embodiment.

FIG. 3 is a plan view illustrating a schematic configuration of a rolling mill according to an embodiment.

FIG. 4 is a side view showing a schematic configuration of a rolling mill according to the embodiment.

FIG. 5 is a front view, partially cut away, showing a moving mechanism of a moving frame in the rolling mill according to the embodiment.

FIG. 6 is a cutaway front view of a main part showing an elevating and lowering mechanism of the elevating body in the rolling mill according to the embodiment.

FIG. 7 is a partially cutaway plan view showing one measuring mechanism in the dimension measuring device according to the embodiment.

FIG. 8 is a partially cutaway side view showing one measuring mechanism in the dimension measuring device according to the embodiment.

FIG. 9 is a partially cutaway plan view showing one measuring mechanism in the dimension measuring device according to the embodiment.

FIG. 10 is a partially cutaway plan view showing one measuring mechanism in the dimension measuring device according to the embodiment in a state where a holding frame is moved.

FIG. 11 is an explanatory diagram illustrating a schematic configuration of a rolling mill according to an example.

FIG. 12 is an explanatory diagram showing a positional relationship between four rolls, a measurement roll, and a ring-shaped material in a rolling mill according to an example.

FIG. 13 is an explanatory diagram showing a positional relationship between a ring-shaped material and a measurement roll at the beginning of rolling.

FIG. 14 is an explanatory diagram showing a positional relationship between a ring-shaped material whose diameter has been increased by rolling and a measurement roll.

[Explanation of symbols]

 Reference Signs List 12 main roll 24 ring-shaped material 24a through hole 23 mandrel roll 30 lower axial roll 31 upper axial roll 60 measuring roll 65 operating shaft 67 air cylinder 74 holding frame 75 hydraulic cylinder S center of ring-shaped material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-89458 (JP, A) JP-A-4-210836 (JP, A) JP-A-4-182005 (JP, A) JP-A 61-89 296201 (JP, A) JP-A-59-170701 (JP, A) JP-A-62-86952 (JP, U) JP-A-61-159489 (JP, U) JP-A-56-59609 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01B 21/10 G01B 5/08

Claims (1)

(57) [Claims] A main roll (12) that is driven to rotate, and is disposed so as to be able to approach and separate from the main roll (12), and is inserted through a center through hole (24a) of a ring-shaped material (24). Mandrel roll (23), a lower axial roll (30) positioned axially below the ring-shaped material (24) and an upper / lower axial roll (30) positioned above and separated from the lower axial roll (30). The main roll (12), the mandrel roll (23) and a pair of axial rolls (30, 31) are provided in the radial and axial directions of the ring-shaped material (24). While rolling, the amount of movement of the measuring roll (60) abutting on the outer peripheral surface of the ring-shaped material (24) during rolling is detected to measure the change in the radial dimension of the material (24). In the rolling mill, the ring-shaped material (24) being rolled is moved in a radial direction orthogonal to the center (S) thereof. Disposed stationary retention means (74)
An operating shaft (65) movably disposed with respect to the holding means (74) and rotatably supporting the measuring roll (60) at one end facing the ring-shaped material (24). An air cylinder (67) disposed on the holding means (74) and for urging the measurement roll (60) to always contact the outer peripheral surface of the ring-shaped material (24) via the operating shaft (65). The holding means (74) is always held in a fixed position, and when an excessive load equal to or larger than a preset value is applied to the measuring roll (60), the ring-shaped material of the holding means (74) ( 24. An apparatus for measuring the dimensions of a material in a rolling mill, comprising: a hydraulic cylinder (75) that allows movement in a direction away from 24).