JPH08187638A - Supporting device for cut workpiece - Google Patents

Abstract

PURPOSE: To minimum the vibration (fluctuation) of a cut workpiece at the time of cutting work. CONSTITUTION: In a device, a cut workpiece 13 is supported at the time of cutting work. A plurality of paired support rolls 14 are rotatably arranged in both side specific positions in the periphery of the cut workpiece 13. A pressing mechanism 16, moving these paired support rolls 14 brought into contact and separated relating to the cut workpiece 13, is set up. In the case of adjacently moving the support rolls 14 against the cut workpiece 13 by this pressing mechanism 16, in order to hold the periphery of the cut workpiece 13 braced while winding around the periphery of the support rolls 14, a belt 17 is arranged. A roll 19, for adjusting tension when this belt 17 holds the cut workpiece 13 braced, and a hydraulic cylinder device 18 for pulling this roll 19 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supporting a pipe during thread cutting of the pipe.

[0002]

2. Description of the Related Art Recent improvements in machine tool manufacturing technology are remarkable. In particular, the machine precision of each part of the machine tool, such as bearings and slide surfaces, is 1/1000 to 5/1.
It is on the order of 000 mm, and it can be said that further improvement in accuracy is almost reaching its limit.

While the accuracy of the machine tool is improved, the machining accuracy of the work material itself manufactured by this machine tool,
That is, the dimensional accuracy has come to be governed by the deformation and vibration of the work material itself. In particular, the quality requirements of users for the pipe end threaded portion and the pipe end sealing surface of oil country tubular goods have become more and more strict, and it is the current situation that it is not possible to handle it simply by improving the machining accuracy of machine tools.

By the way, in the pipe end thread cutting process of oil country tubular goods and the pipe end seal surface cutting process, the finish surface roughness is becoming particularly severe in terms of quality. This is because leakage of the oil well pipe connection is extremely disliked due to the nature of the oil well pipe, and cost reduction is claimed recently. It has been highlighted as an important issue.

An important point for ensuring the machining accuracy of the finished surface is not only the machining accuracy of the machine tool but also the suppression of whirling and vibration of the work material during cutting. However, in the cutting process of the pipe end thread portion of the oil country tubular good, it is the current situation that the quality, particularly the finished surface accuracy is not stable due to the following reasons.

Since there are many types of oil country tubular goods in terms of length and diameter, it is difficult to carry out stable processing under the same conditions. The oil well pipe itself slightly bends in the longitudinal direction, which causes vibration during rotation of the oil well pipe during cutting. This has been a factor that particularly deteriorates the finished surface accuracy of the pipe end seal portion.

Therefore, conventionally, as shown in FIG. 4, a pair of support rolls 1 rotatably arranged vertically at a predetermined interval are arranged on the left and right sides of an oil well pipe 2 to be cut, and The pair of support rolls 1 are moved closer to each other by the respective hydraulic cylinder devices 3 and pressed against the oil well pipe 2 to support the oil well pipe 2.

[0008]

However, the conventional supporting device as shown in FIG. 4 cannot sufficiently support the oil country tubular good. In addition, since conventional support rolls are made of steel or urethane rubber, slight rattling due to uneven wear on the roll surface often becomes the source of vibration for the oil country tubular goods, and Even if the axial center of the oil country tubular good is displaced due to deformation, the supporting effect is drastically reduced.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a supporting device capable of minimizing vibration (fluctuation) of a work material during cutting. .

[0010]

In order to achieve the above object, a supporting device for a work material according to the present invention is a device for supporting the work material at the time of cutting, and both sides of the outer circumference of the work material are supported. A plurality of pairs of support rolls rotatably arranged in a predetermined position, a pressing mechanism that moves the pair of support rolls toward and away from the work material, and this support mechanism makes the support roll a work material. When moved closer to each other, a belt wound around the outer periphery of the support roll and arranged to hold the outer periphery of the work material,
This belt is provided with a roll for adjusting the tension when holding the work material and a pulling mechanism for the roll.

[0011]

According to the support device for a work material of the present invention, a plurality of pairs of support rolls rotatably arranged at predetermined positions on both sides of the outer circumference of the work material, and the support rolls forming these pairs are used as a work material. In order to hold the outer circumference of the work material while being wound around the outer circumference of the support roll when the support mechanism is moved closer to the work material by the pressing mechanism that moves toward and away from the work roll. It is equipped with a belt arranged, a roll for adjusting the tension when this belt holds a work material, and a pulling mechanism for this roll. Support in a hug.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A support device for a work material according to the present invention will be described below with reference to an embodiment shown in FIGS. FIG. 1 is a front view showing a schematic configuration of a work material supporting apparatus according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a plan view illustrating an installation position of a work material supporting apparatus according to the present invention. It is a figure.

As shown in FIG. 3, a plurality of work material supporting devices 11 according to the present invention are arranged at a predetermined interval on the opposite side to the installation position of the thread cutting tool 12a in the thread cutting machine 12 (4 in FIG. 3). It is installed to support the work material 13 at the time of screw cutting and prevents the work material 13 from swinging, and is configured as follows.

In FIGS. 1 and 2, reference numeral 14 denotes, for example, two support rolls that are rotatably supported by a support plate 15 at a predetermined interval, and both sides of the work material 13 on the outer periphery thereof. It is placed in place. The pair of support rolls 14 are respectively pressed by the pressing mechanism 1
It is designed so that it can be moved in and out by 6.

The structure of the pressing mechanism 16 is not limited as long as the pair of support rolls 14 can move toward and away from each other and the work piece 13 can be held by the belt 17 which will be described later. The example discloses the following configuration. That is, for example, 16a is a rocking plate that swings toward and away from the work material 13 with the lower part pivotally supported by the buffer 16c as a fulcrum by the withdrawal and retraction of the rod of the hydraulic cylinder device 16b. The lower part of the support plate 15 is pivotally supported at the intermediate portion of the above, and the upper part of the support plate 15 is pivotally supported at one end of a buffer 16d which is pivotally supported at the upper end of the swing plate 16a.

In the pressing mechanism 16 having the above-described structure, when the rod of the hydraulic cylinder device 16b is moved out, the swing plate 16a uses the lower part as a fulcrum and the upper part as the work material 13
Swing toward. At the same time, the support plate 15 also swings close to the work material 13 due to the close swing of the upper portion of the swing plate 16a, and the two support rolls 14 are attached to the outer periphery of the work material 13 via a belt 17 described later. Abut.

As shown in FIG. 17, the support rolls 14 forming a pair by the pressing mechanism 16 are the work materials 1 respectively.
3 is a belt that is wound around the outer circumference of the support roll 14 so as to hold the outer circumference of the work material 13 when moving closer to the work piece 3. The belt 17 is further moved back and forth by the hydraulic cylinder device 18. The belt 17 is also wound around the roll 19 so that the tension when the belt 17 holds the work material 13 can be adjusted.

The work material supporting apparatus 11 of the present invention is constructed as described above, and the rod of the hydraulic cylinder device 16b is retracted and the rod of the hydraulic cylinder device 18 is projected from the standby state. Hydraulic cylinder device 1
The rod of 6b is projected. As a result, the swing plate 16
In a, the upper part of the support oscillates with respect to the work material 13 with its lower part as a fulcrum, and the support plate 15 also oscillates with respect to the work material 13, so that two pairs of support rolls 14 are formed. The belt 17 approaches the outer periphery of the work material 13 and supports the outer periphery of the work material 13 in a hug shape. Next, the rod of the hydraulic cylinder device 18 is retracted, the belt 17 is pulled through the roll 19, and the tension is set to an optimum value.

In the work material support device 11 of the present invention, the work material 13 is supported in the above-described state, so that the work material 13 is temporarily deformed and the work material 13 is cut during cutting. Even if the axis center position of the
By the action of 6d, the state in which the belt 17 holds the work material 13 can be maintained.

Although the hydraulic cylinder devices 18 and 16b are used as the pulling mechanism and the pressing mechanism in this embodiment, a lead screw feeding mechanism, a jack or the like may be adopted if the same operation is performed. Good.

[0021]

As described above, according to the work material supporting apparatus of the present invention, since the outer periphery of the work material is supported by the belt in a hug-like manner, the supporting state is better than the conventional support roll support. Is also strong and is not affected by rattling of the roll surface. In addition, according to the work material supporting apparatus of the present invention, work materials having various diameters can be stably supported.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a work material supporting apparatus according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view illustrating an installation position of a work material supporting apparatus according to the present invention.

FIG. 4 is a front view showing a schematic configuration of a conventional work material support device.

[Explanation of symbols]

 11 Work Material Support Device 13 Work Material 14 Support Roll 16 Pressing Mechanism 17 Belt 18 Hydraulic Cylinder Device 19 Roll

Claims (1)

[Claims] 1. A device for supporting a work material during cutting, comprising a plurality of pairs of support rolls rotatably arranged at predetermined positions on both sides of the outer circumference of the work material, and a pair of these support rolls. And a pressing mechanism for moving the support roll closer to and away from the work material, and when the support roll is moved closer to the work material by the pressing mechanism, the support roll is wound around the outer circumference of the support roll and the outer circumference of the work material. A device for supporting a work material, comprising a belt arranged to hold the work piece, a roll for adjusting tension when the belt holds the work material, and a pulling mechanism for the roll. .