JPH07164062A - Device for adjusting roll width of split type forming roll - Google Patents

Abstract

PURPOSE:To provide the device for adjusting a roll width which enables the positioning of a split type forming roll with one action. CONSTITUTION:The device is constituted of a hollow spindle 1, which is supported by bearings 2, 2 on both sides and to one end of which a gear 10 to be engaged with a driving source is attached; a pair of left and right hollow cylindrical roll holders 8, 8, which are provided with a clamping means that is fitted freely slidably to the middle outer circumference of the spindle 1 in the axial direction and that is fixed at an arbitrary position on the outer circumferential surface of the spindle; and a pair of left and right split type forming rolls 7, 7 which are each retained by the roll holders 8, 8. In addition, the device is constituted of an adjusting shaft 3, which is fitted freely rotatably in the inside of the hollow spindle 1 with oppositely threaded screw parts 3a, 3b provided on both ends and with a rotary handle 6 provided on one end; and a gear 4 which is each novably linked to the screw part 3a, 3b to freely forwards and backwards on the thread of the screw and by which this movement is transmitted to the roll holder 8. Thus, positioning is performed with one action for the split type forming roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll width adjusting device for split mold forming rolls used for manufacturing welded steel pipes.

[0002]

2. Description of the Related Art A roll forming apparatus in a welded steel pipe production line for continuously processing a strip steel is provided with an upper roll and a lower roll as forming rolls, and the strip steel is passed between the upper and lower rolls to bend a so-called flower. However, replacing the forming rolls every time the tube-making size is changed requires a large number of rolls with different dimensions, and the replacement is not easy and costly.In recent years, the split roll method has become the mainstream. There is.

The split roll system is composed of a split body obtained by dividing the forming roll into left and right parts, that is, a split type forming roll, and the pipe making size can be changed by adjusting the mutual interval. As the adjusting means, for example, JP-A-57-28627 proposes one having a spiral adjusting mechanism, and JP-A-57-209722 proposes replacing the spacer between the split rolls. ing.

The former Japanese Patent Application Laid-Open No. 57-28627 discloses a forming roll which is composed of left and right divided rolls and which is formed by continuously forming a metal strip into a desired cross-sectional shape, wherein an outer shaft is provided outside an inner shaft. It is fitted and connected to each other by a key, and a female screw that is screwed into a male screw on the outer circumference of the outer shaft is provided, and the nut is movable along a key groove provided on the outer surface of the outer shaft in parallel with the axis. Characterized in that the split roll is rotatably engaged with a groove on the side surface of the split roll fitted to the outer shaft, and the split roll can be moved in parallel with the axial center by rotating the nut around the outer shaft. It is a forming roll.

The latter Japanese Patent Application Laid-Open No. 57-209722 discloses that in a breakdown roll stand for producing electric resistance welded steel pipe, the upper roll and the lower roll are provided with an upper roll and a lower roll capable of adjusting a mutual distance. Each of which is composed of a pair of roll members, and is provided between the pair of roll members so as to be replaceable with a spacer for setting a gap between the pair of roll members to a desired gap. A break-down roll stand for electric resistance welded steel pipe, characterized in that a fixing means is provided for clamping and fixing the roll member intervals to each other.

[0006]

However, in the former adjusting means of JP-A-57-28627, since the inner shaft and the outer shaft, which are horizontal main shafts, are the screws themselves, the split roll receives a large load. In that case, there is a great risk that the inner shaft or the outer shaft will be damaged due to stress concentration in the threaded portion. Further, since there is no backlash adjusting mechanism, it is not suitable for thin plate pipe making, which requires particularly high precision.

Further, in the latter case of the adjusting means of Japanese Patent Laid-Open No. 209722/1982, when the spacer interposed between the pair of left and right split rolls is replaced with one having a different size as required,
It has the drawback of requiring considerable time and effort. It is an object of the present invention to provide a roll width adjusting device for a split mold forming roll that solves the problems of the above-described conventional techniques.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a hollow main shaft is supported by bearings on both sides, and a gear linked to a drive source is attached to one end of the hollow main shaft. A pair of left and right hollow cylindrical roll holders that are slidably fitted to the main shaft and that are provided with gripping means for fixing them to arbitrary positions on the outer peripheral surface of the main shaft; An adjusting shaft which is rotatably fitted in the hollow inside of the main shaft and the main forming shaft, and has screw parts with different screw directions screwed on both ends thereof, and a rotation handle provided on one end thereof. And a screw element that is respectively linked to the screw portion so as to be able to advance and retreat and that transmits the screw advance and retreat to the roll holder, a roll width adjusting device for a split-type forming roll.

The roll holder is composed of a hydraulic holder capable of gripping the outer peripheral surface of the main shaft by reducing the diameter of the circumferential surface by pressurizing a two-stage piston mechanism composed of a main piston and an auxiliary piston. preferable.

[0010]

[Operation] According to the present invention, an adjusting shaft provided with a screw and a rotating handle is fitted in the hollow portion of the main shaft, and the pressurization of a two-stage piston mechanism including a main piston and an auxiliary piston is applied. Since the roll holder that can be held by the outer peripheral surface of the main shaft is held by the diameter reducing action of the circumferential surface caused by, the roll holder can be moved by rotating the adjustment shaft. It is possible to position the split mold roll with one touch.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part thereof. In FIG. 1, reference numeral 1 is a hollow main shaft that is rotatably supported by bearings 2 and 2 on both sides, and reference numeral 3 is an adjusting shaft that is rotatably provided inside the hollow main shaft 1. On both ends 3a and 3b of the adjusting shaft 3, screw parts having different screw directions are screwed. Reference numeral 4 denotes a screw element such as a nut screwed to the screw portion, and a flange 5 is fixedly attached to the screw element. Reference numeral 6 denotes a rotating handle attached to one end 3a of the adjusting shaft 3.

Reference numeral 7 is a pair of left and right split-type forming rolls.
Reference numeral 8 denotes a pair of left and right hollow cylindrical roll holders which are supported by the main shaft 1 and hold the split mold forming rolls 7 to be slidable in the axial direction. 9 is a flange 5 and a roll holder 8
It is a transmission rod that connects with. Reference numeral 10 denotes a gear attached to the main shaft 1, which is a shaft 11 coupled to a drive device (not shown).
The main shaft 1 is driven by being driven by meshing with a gear 12 attached to the.

Here, the roll holder 8 which is the main point of the present invention
The configuration will be described in detail. This roll holder 8
2, as shown in FIG.
Hollow cylinder-shaped hydraulic holder 14 that is held integrally via
A first holding metal fitting 16 fixed to the transmission rod 9 by a pin 15 and connected to the hydraulic holder 14, and a second holding metal fitting adjacent to the first holding metal fitting 16 through which the transmission rod 9 penetrates. The holding metal fitting 17 and the spring 18 that biases the second holding metal fitting 17 are mainly configured.

The above-mentioned hydraulic holder 14 is provided with four hydraulic cylinder chambers 19 symmetrically on its circumference, and a hydraulic chamber 20 is bored on the surface side facing the outer peripheral surface of the main shaft 1. It A cylindrical thin film 21 is joined to the inside of the hydraulic chamber 20 by welding or the like, and the thin film 21 is loaded with hydraulic pressure via a pressure oil passage 22. The hydraulic holder 14 is rotatable with respect to the first holding member 16 via bearings 23 and 24.
The bearings 23 and 24 are fixed by an inner ring holding member 25 and an outer ring holding member 26, respectively.

The first holding member 16 has a ring-shaped hydraulic chamber.
27 are provided symmetrically in the axial direction of the transmission rod 9, and the second holding fitting 17 is attached to the auxiliary piston 28 fitted in the hydraulic chamber 27.
Are directly connected. The second holding metal fitting 17 is further rotatable with respect to a holding member 31 fixed to the hydraulic holder 14 via bearings 29 and 30. The inner ring side of the bearing 29 is the nut 32.
The outer ring side is fixed by the outer ring pressing member 33. A main piston 34 fitted in the hydraulic cylinder chamber 19 is fastened to the holding member 31 with a bolt 35. In addition, 36 is an oil seal inserted between the second holding member 17 and the holding member 31.

With this structure, after rotating the rotating handle 6 to position the roll holder 8 at a predetermined position, the roll holder 8 is inserted into the hydraulic chamber 27 via the port 37 formed in the first holding metal fitting 16. When the pressure oil is supplied, the auxiliary piston 28 is pressurized and slides on the second holding metal fitting 17 in the axial direction. Then, the main piston 34 is pressurized and operates in the axial direction, and the oil in the hydraulic cylinder chamber 19 is loaded on the thin film 21 via the pressure oil passage 22. Further, since the thin film 21 causes a diameter reducing action in the circumferential direction to grip the main shaft 1, the roll holder 8 can be fixed. Thereby, the split mold forming roll 7 can be positioned.

Next, when it is desired to change the position of the split mold roll 7, the pressure oil is drained from the port 37 so that the auxiliary piston 28 returns to its original position by the urging force of the spring 18 and follows it. Since the main piston 34 returns to the original position, the diameter expansion action is exerted on the thin film 21 and the gripping force is released. Therefore, the rotation handle 6 can be operated to move the roll holder 8 to a required roll width, so that the position of the split mold forming roll 7 can be changed.

[0018]

According to the present invention, an adjusting shaft having a screw and a rotating handle is fitted in a hollow portion of a main shaft, and a two-stage piston mechanism including a main piston and an auxiliary piston is added. Since the split-type forming roll is held by the roll holder that can be held on the outer peripheral surface of the main shaft by the pressure reducing action of the circumferential surface by the pressure, the roll holder can be moved by rotating the adjusting shaft. Positioning of split mold rolls can be done with one touch, which shortens roll change time, improves product quality by improving roll width setting accuracy, and saves labor and work safety. Contribute to improvement.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

[Explanation of symbols]

 1 main shaft 2 bearing 3 adjusting shafts 3a, 3b screw part 4 screwer 6 rotation handle 7 split mold roll 8 roll holder 9 transmission rod 10 gear 14 hydraulic holder 16 first holding bracket 17 second holding bracket 19 hydraulic pressure Cylinder chamber 20 Hydraulic chamber 21 Thin film (grasping means) 23, 24, 29, 30 Bearing 27 Hydraulic chamber 28 Auxiliary piston 34 Main piston

Claims (2)

[Claims] 1. A hollow main shaft, which is axially supported by bearings on both sides and has a gear linked to a drive source at one end thereof, and an intermediate outer periphery of the main shaft which is slidably fitted in the axial direction. A pair of left and right hollow cylindrical roll holders provided with gripping means for fixing the spindle at an arbitrary position on the outer peripheral surface thereof, a pair of left and right split mold forming rolls respectively held by the roll holders, and It is rotatably fitted inside the hollow, and screw parts with different screw directions are screwed at both ends, and an adjusting shaft having a rotating handle at one end and the screw part are respectively screwed. A screwdriver that is linked to move forward and backward and transmits the screw forward and backward movement to the roll holder;
A roll width adjusting device for a split mold forming roll. 2. The roll holder is composed of a hydraulic holder capable of gripping an outer peripheral surface of a main shaft by a diameter reducing action of a peripheral surface by pressurization of a two-stage piston mechanism including a main piston and an auxiliary piston. The roll width adjusting device for the split mold forming roll according to claim 1.