JPS643567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill in which upper and lower roll rolling devices operate in conjunction with each other.

As shown in FIGS. 1 and 2, conventional rolling mill roll rolling devices normally operate one of the upper and lower rolling devices by an electric motor-driven rolling screw A and a rolling nut B, and the other by a hydraulic screwdriver. The position of the rolling screw is fixed during the rolling operation, and the rolling position is advanced exclusively by the hydraulic cylinder as the rolling progresses. Due to A, the rolling position gradually approaches the fixed roll, which has the disadvantage that the pass line is not constant. This drawback is particularly unbearable in the case of pipe mills where the straightness of the product is an issue, so the upper and lower rolling devices are constructed with hydraulic cylinders as shown in Figure 3, and both rolling devices are arranged symmetrically with respect to the pass line. Countermeasures have been considered to maintain the pass line constant by operating the cylinder up and down, but this would significantly increase costs as the number of hydraulic cylinders would be doubled. Further, since the hydraulic cylinder is usually incorporated into the housing, in the case of a rolling mill in which the rolls are replaced for each housing, the hydraulic system must be replaced as well, resulting in particularly high costs.

In view of the above-mentioned drawbacks, the present invention has been made with the object of providing a rolling mill that maintains a constant pass line and is low in cost.The present invention consists of a rolling screw with a gear attached to one end of the shaft and a rolling nut. By providing lowering devices at the upper and lower portions of the housing, and by providing a connecting means consisting of a gear device and a connecting shaft that engage and interlock with the gears at the upper and lower portions, the screws at the upper and lower portions can be moved up and down symmetrically with respect to the pass line. The present invention relates to a hydraulic rolling mill, which is provided with an interlocking mechanism configured as described above, and further includes a hydraulic cylinder that engages with a part of the interlocking mechanism to cause relative movement between the reduction screw and the reduction nut.

The attached drawings (No. 4
This will be explained in detail based on Figure).

The rolling positions of the rolling rolls 1, 2 are determined by upper and lower rolling screws 3, 3', 4, 4', respectively.
The reduction screws 3, 3', 4, 4' are attached to the upper and lower parts of the housing 5 by means of reduction nuts 6,
6', 7, 7', and gears 10, 10',
11, 11'. This gear 10, 10', 1
1 and 11' are engaged with upper and lower worms 12, 12', 13, and 13' fixed to the housing 5, and the shaft ends of the shafts 15 and 16 of the upper and lower worms are connected to each other through upper and lower bevel gear sets 17 and 18. They are respectively connected to the upper and lower parts of a single connecting shaft 19 arranged vertically along the rolling mill, and when the connecting shaft 19 is rotated, the upper and lower rolling devices are interlocked. The power for driving the lowering device is a hydraulic cylinder 20 operated by hydraulic pressure.
The rack 22 attached to the rod 21 of the hydraulic cylinder engages with the gear 23 attached to the connecting shaft 19.

To explain the operation of the above-mentioned lowering device and connecting device, first, the rod 21 of the hydraulic cylinder 20 is
When the shaft 19 moves in the direction of arrow B, the rack 22 and gear 23 rotate the shaft 19 in the direction of arrow B, and the rotation of this shaft causes the upper and lower worm shafts 15 and 16 to rotate in the direction of arrow C via the upper and lower bevel gear sets 17 and 18. Upper and lower gears 10, 10', 11, which rotate and engage with the worm.
Rotate 11'. This gear 10, 10', 1
1 and 11' are fitted into the spline S cut into the shaft of the reduction screw, so the reduction screw 3,
3', 4, and 4' rotate the threaded portion of the reduction nut in the direction of arrow D and move up and down in the direction of arrow E. Since the upper and lower lowering devices and the system for driving them are all manufactured symmetrically, the upper and lower lowering screws move up and down symmetrically to the pass line P by the operation of the hydraulic cylinder, and the pass line is always maintained constant.

Next, a second embodiment of the present invention will be described in the attached drawings (fifth embodiment).
This will be explained using Figure). The upper and lower reduction screws 3, 3', 4, 4' are connected to reduction nuts 6, 6', 7, respectively.
7'. However, either one of the upper and lower screws (in this embodiment, the upper screw 3,
3') is held so that it can only move up and down without rotating, and the upper lowering nuts 6 and 6' have sector gear teeth T carved on the outer periphery of the nut.
engages a rack 22 attached to a piston rod 21 of a hydraulic cylinder 20 mounted on the housing 5. Note that the nut is held horizontally rotatably within the housing. Upper gears 10, 10' are attached to the shaft ends of the upper screws 3, 3', and these gears 10, 10' can freely rotate around the screw shafts 8, 8'.
The screw shafts 8, 8' are fitted into the screw shafts 8, 8' so as to be free against the vertical movement of the nuts 6, 6', and the lower surface of the gear and the upper surface of the rolling nut are connected by cylinders 24, 24'. ′ rotates gears 10 and 1.
0' is also adapted to rotate about screw axes 8, 8'. The lower gears 11, 11' are the first
It is attached to the shafts 9, 9' of the lower screw via splines S as in the embodiment. Upper gears 10, 10' are engaged with upper worms 12, 12' which have sufficiently small lead angles and can be driven from the gear side, and one end of the shaft 15 of this worm is a bevel gear connected to a vertical connecting shaft 19. Set 17 is installed. Worms 13 and 13' engage with the lower gears 11 and 11' in the same way as the upper gears, and a bevel gear set 1 connected to a connecting shaft 19 is connected to one end of the shaft 16 of the worm.
8, and lower the upper and lower reduction screws 3, 3', 4,
4' are configured to be integrated and interlocked by the connecting shaft 19.

To explain the operation of the device in the second embodiment, when the hydraulic cylinder 20 moves in the H direction, the easy 2
2, 22' rotate the upper nut 6, 6', and the cylinder 2
The upper gears 10, 10' are driven to rotate in the same direction as the nut via the upper gears 4, 24'. The rotation of this gear is caused by the upper worms 12, 12', the worm shaft 15, the upper bevel gear set 17, the connecting rod 19, and the lower bevel gear set 1.
8, Worm shaft 16, lower worm 13,1
3', the lower gears 11, 11' are rotated in the I direction. On the other hand, the upper screws 3, 3' move downward (arrow J) by the action of the screws of the nuts 6, 6' without rotating themselves. Further, the lower screws 4, 4' move upward (arrow J) while turning along the threads of the lower nuts 7, 7', and thus the vertical lowering device moves up and down symmetrically to the pass line P according to the reciprocating motion of the hydraulic cylinder. Exercise.

Next, the control device for the screw down device will be explained with reference to FIG. 7. The control device includes a screw down position setter 25,
It consists of a device (hydraulic cylinder position detector) 26 for detecting the actual reduction position, and a control valve 27 that operates the hydraulic cylinder in proportion to the difference between the actual reduction position and the set reduction position. The rolling position is set manually, or the rolling amount of each pass is set automatically using a predetermined program.

Another control method is to lower the rolling position by an amount proportional to the rolling force (FIG. 8).
In this case, the lower lowering nuts 7, 7' are provided with a spline F on the outer periphery parallel to the central axis of the nut, and are installed in the housing so as to be slidable in the vertical direction with respect to the housing, and the lower lowering nuts 7, 7' A load detector 28 is provided between the housing mounting part and the rolling force is directly detected and sent to the control valve 27 through a command device 29.
controls the hydraulic cylinder. That is, as rolling progresses and the rolling load decreases, the rolling position is further advanced.

Since the above-mentioned hydraulic system uses hydraulic pressure, it has the advantage of sensitive control response, reliable operation, and easy automation.

It should be noted that the present invention is not limited only to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

Since the hydraulic rolling mill of the present invention has the above-described configuration, it exhibits the following effects.

(i) Since the upper and lower lowering devices are mechanically coupled and interlock symmetrically with the pass line, the pass line is held constant. It is particularly suitable for pipe mills where straightness of the product is required.

(ii) In rolling mills in which the rolls are replaced in each housing, no hydraulic system is used in the housing, so there is no need to replace the expensive hydraulic system, and the replacement cost is low.

(iii) Since the control device uses hydraulic pressure, the response is quick and reliable, and automation is easy.

[Brief explanation of drawings]

1 and 2 are conceptual diagrams showing the arrangement of the rolling device of a conventional rolling mill, FIG. 3 is a conceptual diagram showing the arrangement of the vertical rolling device in a hydraulic type, and FIG. FIG. 5 is a conceptual diagram showing the second embodiment, and FIG. 6 is a conceptual diagram showing the second embodiment.
7 is an explanatory diagram showing a control mechanism of the hydraulic rolling mill of the present invention, and FIG. 8 is an explanatory diagram showing another control mechanism of the hydraulic rolling mill of the present invention. In the figure, 3, 3' are upper screws, 4, 4' are lower screws, 6, 6' are upper screws,
7 and 7' are lower lowering nuts, 10 and 10' are upper gears, 11 and 11' are lower gears, 12 and 12' are upper worms, 13 and 13' are lower worms, 19 is a connecting shaft, and 20 is a hydraulic cylinder. , 25 is a pressure-down position setter, 26 is a pressure-down position detector, 27 is a control valve, 2
8 is a load detector, and 29 is a command device.

Claims (1)

[Scope of Claims] 1. A lowering device consisting of a lowering screw and a lowering nut is provided at the upper and lower portions of the housing, and gears are attached to the ends of the upper and lower lower screwing screws so as to be rotatable integrally with the lowering screws, and, By connecting the upper and lower gears using a gear device and a connecting shaft, the upper and lower lower screws can be moved up and down symmetrically with the pass line. Furthermore, a gear is attached to the connecting shaft, and a hydraulic pressure is applied to the gear. A hydraulic rolling mill characterized by engaging racks attached to cylinder rods. 2. A rolling device consisting of a rolling screw and a rolling nut is provided in the upper and lower parts of the housing, and a gear is provided at the end of one of the rolling screws in the upper and lower parts so as to be rotatable integrally with the rolling screw, and the other A gear is provided at the end of the reduction screw so that it can rotate integrally with the reduction nut, and by connecting the upper and lower gears using a gear device and a connecting shaft, the upper and lower reduction screws can be connected to the pass line. A hydraulic rolling mill characterized in that a gear is provided on the outer periphery of a rolling nut which is capable of symmetrical vertical movement and which rotates integrally with the gear, and a rack attached to a rod of a hydraulic cylinder is meshed with the gear. 3. A rolling device consisting of a rolling screw and a rolling nut is provided at the upper and lower portions of the housing, and gears are attached to the ends of the upper and lower rolling screws so as to be rotatable integrally with the rolling screws, and between the upper and lower gears. By connecting them using a gear device and a connecting shaft, the upper and lower lower screws can be moved up and down symmetrically with the pass line, and a gear is attached to the connecting shaft, and the gear is attached to the rod of a hydraulic cylinder. It is characterized by having a device that engages the racks to set the rolled down position, a device that detects the actual rolled down position, and a control device that operates the hydraulic cylinder in proportion to the difference between the actual rolled down position and the set position. Hydraulic rolling mill. 4. A rolling device consisting of a rolling screw and a rolling nut is provided in the upper and lower parts of the housing, and a gear is provided at the end of one of the rolling screws in the upper and lower parts so as to be rotatable integrally with the rolling screw, and the other A gear is provided at the end of the reduction screw so that it can rotate integrally with the reduction nut, and
By connecting the upper and lower gears using a gear device and a connecting shaft, the upper and lower rolling screws can be moved up and down symmetrically with the pass line, and the outer periphery of the rolling nut that rotates integrally with the gears can be moved up and down symmetrically with the pass line. A gear is provided, and a device is provided to set the rolling position by engaging a rack attached to the rod of the hydraulic cylinder with the gear, and a device is provided to detect the actual rolling position. A hydraulic rolling mill characterized in that it is equipped with a control device that operates a hydraulic cylinder. 5. A rolling device consisting of a rolling screw and a rolling nut is provided at the upper and lower portions of the housing, and gears are attached to the ends of the upper and lower rolling screws so as to be rotatable integrally with the rolling screws, and between the upper and lower gears. By connecting the screws using a gear device and a connecting shaft, the upper and lower lower screws can be moved up and down symmetrically with the pass line, and a gear is attached to the connecting shaft, and the gear is attached to the rod of a hydraulic cylinder. A hydraulic rolling mill characterized in that a load detector is provided between a lower reduction nut and a lower inner surface of a housing when the racks are engaged with each other, and a command device is provided to cause a reduction device to be rolled down by an amount proportional to the rolling force. 6. A rolling device consisting of a rolling screw and a rolling nut is provided in the upper and lower parts of the housing, and a gear is provided at the end of one of the rolling screws in the upper and lower parts so as to be rotatable integrally with the rolling screw, and A gear is provided at the end of the reduction screw so that it can rotate integrally with the reduction nut, and by connecting the upper and lower gears using a gear device and a connecting shaft, the upper and lower reduction screws can be connected to the pass line. A gear is provided on the outer periphery of the reduction nut that can be moved up and down symmetrically and rotates integrally with the gear, and a rack attached to the rod of the hydraulic cylinder is engaged with the gear to reduce the load between the lower reduction nut and the inner surface of the lower part of the housing. A hydraulic rolling mill characterized in that a detector is provided and a command device is provided to cause a rolling device to roll down by an amount proportional to rolling force.