JPH06143001A - Machine tool for working end part of lengthy material - Google Patents

Abstract

PURPOSE:To reduce core deviation between each process, and to carry out machining at high accuracy by transferring a material to be processed from a first process to a second process while chucking is done. CONSTITUTION:A plurality of lengthy materials 9 are machined at the same time in each process by a plurality of working machines 2. Since a supporting device W, with which the lengthy material 9 is supported, and a clamp device U, by which the lengthy material is held, are rotated synchronously, a lengthy material, for which a first process B is finished, and a lengthy material which is at a carry-in point A are moved in parallel to one another, and are moved at the same time to a position C of the second process and to the position B of the first process. Since the supporting device W is rotated once per one revolution, the fixed position is constantly maintained. The lengthy material 9 is transferred from the side and the like to the supporting device, or from the supporting device W to the side and the like. Although the position of the lengthy material is changed to rotational direction, it is held tight by the clamp device U and is thus machined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool, and more particularly to a machine tool having a plurality of steps including a threading process for an end of a long material such as a steel pipe for oil wells with high accuracy, high efficiency and labor saving. Regarding machine tools.

[0002]

2. Description of the Related Art A long material, for example, an end portion of a steel pipe for oil wells is processed by a plurality of steps. Since the steel pipes for oil wells are connected and used, processing for connection is performed. Since sealing property is required for the connecting portion, taper surface processing,
High shape and positional accuracy such as squareness and concentricity are required between a plurality of processing surfaces in processes such as end surface processing and thread cutting processing.

There are two conventional processing methods. One is a method of gripping a pipe material with a chuck by a lathe method, rotating the pipe material integrally with the chuck, and processing by relative movement of the pipe material and a tool. The other is a method in which a pipe material is gripped by a chuck fixed to a machine base by a tool rotation method, and the tool is rotated to perform a relative movement between the pipe material and the tool.

According to the above-mentioned lathe system, it is possible to perform the full turning of the inner diameter, the end surface, the outer diameter, the screw portion and the seal portion without performing the gripping operation of the pipe material by the chuck. However, when exchanging processed and unprocessed tubing, the tubing is moved in and out of the rotary chuck, and the spindle is started / machined for each process.
There is a problem that it takes a long time to stop the process and the like, so that highly efficient processing cannot be performed. Further, since a long pipe material is rotated and cut, there is a drawback in that it is difficult to obtain a good finished surface particularly with a small-diameter pipe material that is susceptible to vibration.

On the other hand, there is a tool rotation type machining method.
A. P. I (American Petroleum
The standard outside diameter screw specified by Institute can be processed with high efficiency. For example, in FIG.
As shown in (a), an end surface processing A ₁ performed by moving a rotary blade of a tool rotating about an axis L in the radial direction, and a tapered surface processing A ₂ performed by moving the rotary blade forward while moving in the radial direction,
_Three chamfering processes A ₃ for chamfering the end portion on the inner peripheral surface side are performed by the pipe end processing machine in the first step. Next, as a second step using a thread cutting machine, as shown in FIG.
As shown in (b), taper surface screw down processing and taper surface thread cutting processing B ₁ are performed.

Unlike the lathe method, these machining operations do not require starting and stopping of the spindle, and the first process is the first machining machine.
Since the second step is performed by the second processing machine, the processing can be performed with high efficiency.

However, in the case of the special screw for improving the sealing performance, as shown in FIGS. 2 (a) and 2 (b), inner diameter processing and sealing surface processing are added, X-axis stroke restriction, rotary blade head Due to the space limitations of the above, machining by the tool rotation method is difficult.

[0008]

Since there are problems in each of the above-mentioned two methods of machining, a machining method in which the steps are divided while taking advantage of the above-described advantages of the tool rotation method has been considered. That is, at the same time when the inner diameter of the pipe material is processed in the first step, a part of the outer diameter is discarded. The processed pipe material is removed from the chuck in the first step, transferred to the second step, the outer peripheral surface discarded in the first step is centered with the centering chuck, and clamped with the floating chuck.
A method of performing the processing in the second step shown in FIG. 2B has been considered.

However, there is a problem in the processing of the improved system. This improved machining is effective for medium-diameter pipe materials with relatively high rigidity, but in general, due to bending of the tip side of the pipe, elastic deformation, etc., There is a problem in that concentricity defects occur because it is impossible to avoid the occurrence of misalignment when moving the tube material in two steps and grasping the tube material.

The present invention has been invented in such a technical background and achieves the following objects.

An object of the present invention is to provide a machine tool for processing a long end portion for processing an end portion of a long material with high accuracy and high efficiency.

Another object of the present invention is to provide a target machine tool for machining a long end which can save labor.

[0013]

The present invention adopts the following means in order to achieve the above object.

According to the present invention, two or more processing machines each of which performs each processing are provided at the same time so as to be rotatable and indexable integrally with the first rotary shaft, and the first rotary shaft is shared. Revolved and stopped at the long material loading position (A), each processing position (B, C) facing the two or more processing machines, and the long material unloading position (D), and the length Clamping device having a plurality of chucks for holding a scale and a second rotary shaft having an axis parallel to the axis of the first rotary shaft, and rotating indexing integrally with the first rotary shaft and in synchronization with the first rotary shaft. It is freely provided, revolves around the second rotation axis, and carries in a long material loading position (A), each processing position (B, C) facing the two or more processing machines, and a long material. Material carry-out position (D)
And a rest device having a plurality of rotating bodies that are positioned and stopped to rotate once per revolution of the second rotating shaft in a direction opposite to the second rotating shaft, and are attached to the rotating body, respectively. A supporting device for supporting the long material, a synchronizing device for synchronously rotating the first rotating shaft and the second rotating shaft, and carrying the long material onto the supporting device at the carry-in position A. In addition, the machine tool for processing a long material is provided with a transfer device for carrying out the long material on the support device at the carry-in position D.

The rest device is a rotary indexable rotary disk integrally provided with the second rotary shaft, a sun gear provided on a fixed side of the machine tool section, and a rotary disk around the rotary disk. A plurality of intermediate gears that are arranged and mesh with the sun gear, and a plurality of planetary gears that are arranged around the rotating disk and mesh with the intermediate gears may be used.

Further, if a plurality of the rest devices are arranged, it is possible to cope with a long object.

[0017]

A plurality of long materials are processed simultaneously by a plurality of processing machines. Since the supporting device that supports the long material and the clamp device that grips the long material rotate in synchronization, the long material that has completed the first process and the long material that is at the loading position are parallel to each other. At the same time, it moves to the position of the second process and the position of the first process.

Since the support device rotates once per revolution, the support device always keeps its posture constant. The long material is transferred from the side or the like onto the support device, and is transferred from the support device to the side or the like. Although the long material changes its position in the rotation direction, it is firmly gripped and processed by the clamp device.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIGS. 3-8 show one embodiment of the present invention. The present invention comprises a processing machine, a clamp device, a rest device, a supporting device, a synchronizing device, first and second transfer devices, and the like. Hereinafter, each device will be sequentially described.

Processing Machine T As shown in FIG. 3, the processing machine 2 is placed on the bed 1. The first servomotor 3 is for controlling the position of the processing machine 2 on the bed 1 in the axial direction (left and right in the plane of the drawing) to move it back and forth. The second servo motor 4 is the processing machine 2
The position of the cutting blade (not shown) is controlled in the direction perpendicular to the axis to be moved.

In this embodiment, two processing machines 2 are provided and arranged side by side in a direction orthogonal to the paper surface. First and second
The servomotors 3 and 4 are attached to each processing machine 2. Although the structure of the processing machine 2 is well known, its description is omitted, but it is disclosed in detail in, for example, Japanese Patent Publication No. 3-2601 and drawings. The two processing machines 2 and 2 are for the first step and the second step, and are simultaneously controlled.

Clamping device U As shown in FIGS. 3 and 4 (section E-E in FIG. 3),
The disk-shaped index plate 5 has a first rotary shaft 6, which is rotationally driven by a hydraulic motor or an electric motor 7. This rotary shaft 6 is provided with a hydraulic servomotor or a known indexing mechanism, and is accurately indexed by 72 degrees.
It is fixed in the stop position hydraulically or by mechanical clamping means.

On the front and back of the index plate 5, chucks 8, 8 ... Which independently operate at five positions on the same circumference are provided by being fitted in the axial direction one by one. As each chuck 8, a workpiece to be gripped, for example, a chuck for centering that can fix the center of the pipe material 9 at a fixed position, or a floating chuck is used. A known hollow chuck for a lathe may be used.

When the machining position is set to two positions, four machining positions of two machining positions, a carry-in position and a carry-out position may be indexed. However, in consideration of the rigidity of the whole, in the present embodiment, as shown in the figure. It is a 5-position index. Therefore, one position is an idle station with no machining.

Rest Device V FIG. 5 is a sectional view taken along line BB in FIG. A support block 12 is movably provided on a base 10 via a screw type jack 11 driven and controlled by a drive motor (not shown), and a support base 13 is fixed to the support block 12. One second rotating shaft 14 passes through the support base 13, and the rest device body 15 is coupled to the rotating shaft 14.

FIG. 6 (a sectional view taken along the line DD in FIG. 3) shows the inside of the casing of the rest device body 15. A sun gear 16 is rotatably fitted on the second rotating shaft 14. The sun gear 16 is rotatable with respect to the rest device body 15 and the second rotating shaft 14, but is fixed with respect to the support base 13 and does not rotate.

The sun gear 16 includes five intermediate gears 17
Mesh with each other, and the intermediate shaft 18 of each intermediate gear 17 is rotatably supported by the rest device body 15. A planetary gear 19 is meshed with each intermediate gear 17 one by one, and each rotation shaft (hereinafter referred to as a rotation shaft) 20 is also supported by the rest device body 15 in the same manner as the intermediate shaft 18.

The sun gear 16 and each planetary gear 19 have the same number of teeth, and both gears 16 and 19 mesh with the intermediate gear 17 in common, and each planetary gear 19 revolves once with respect to the sun gear 16. Rotate once. The rotation shaft 20 of the planetary gear 19,
20, ... Are equidistant from the second rotating shaft 14 and are arranged at positions divided into five equal parts on the same circumference.

Supporting device W The rotation shafts 20, 20, ...
1 ... is fixed. On the roller supporting bases 21, 21, ..., So-called V-shaped rollers 22, 22, ... In the form in which two truncated cones are butted against each other are rotatably supported. It also serves as a guide roller for transferring the pipe material in the axial direction of the spindle, and also has a role of supporting the pipe material during indexing, stopping, and processing.

The rotation axes of the V-shaped rollers 22, 22, ... Are always maintained in the horizontal direction and are orthogonal to the second rotation axis 14. The rotating shafts 20, 20, ... Are not on the extension of the center line of each chuck 8 of the clamping device U. Chuck 8,
When the extension lines of the center lines of 8, ... Are translated by the same size, they all coincide with the axis lines of the rotation axes 20, 20 ,.

Synchronizing device X The index plate 5 of the clamp device U and the main body 15 of the rest device V rotate synchronously at the same speed.
Although the synchronizing device X for that purpose is not shown in the figure, it can be easily constructed by a known means. For example, a universal joint is connected to the end of the first rotating shaft 6 of the clamp device U and the end of the second rotating shaft 14 of the rest device V, and one connecting shaft is provided between the universal joints at both ends. Join. Alternatively, both rotary shafts 6 and 14 may be driven by servo motors, respectively, and the relative phases of the rotation angles of both servo motors may be controlled to be zero.

First Transfer Device Y FIG. 7 is a sectional view taken along the line FF of FIG. 3, showing the first transfer device Y. The pipe material 9 rolls on the carry-in rail 50 inclined at a predetermined angle, contacts the stopper 51, and is stored on the carry-in rail 50. A walking arm device 40 is provided on the support block 12. That is, the walking arm body 43 is attached to the support block 12.

The walking arm main body 43 is provided with an arm 41 so as to rotate counterclockwise in FIG. A V-roller 44 is provided at the tip of the arm 41. That is, when the arm 41 rotates, the pipe material 9 is supported by the V-roller 44 and lifted from the carry-in rail 50, passes above the stopper 51, and passes through the rest device V.
It is transferred onto the supporting device W at the position A in FIG.

[0034]Second transfer device Z  FIG. 7 also shows a second transfer device Z. No. 46 of the cradle
On the opposite side of the first transfer device Y from the first transfer device Y,
A walking arm device 40a having the same structure is provided.
There is. Therefore, the support of the position D of the processed rest device V is
When the pipe material 9 on the holding device W is supported by the V roller 44,
Carrying out race that is lifted up and tilted at a certain angle
52 is transferred. The transferred pipe material 9 is a unloading rail.
It rolls on 52 and is carried out.

Vertical Feed Transfer Device S FIG. 8 is a sectional view taken along the line CC in FIG. 3, showing the vertical feed transfer device S. The left and right moving bodies 36, 36 slide in the front-rear direction (left-right direction in FIG. 3) by being guided by the guide portion 35a provided on the transfer base 35 on the base 10. The two pairs of moving bodies 36, 36 are driven by the rotation of the ball screws 38, 38 to which the driving forces of the respective drive motors 37, 37 fixed only to the transfer base 35 are transmitted, and move in the front-rear direction. At the side of the moving body 36, the pipe material feeding gripping device 3 is provided.
0 is provided.

The gripping device 30 for feeding the pipe material moves the contact rollers 34 provided at the tips of the three pairs of holding members 33 in the radial direction by driving the cylinder 32 provided in the gripping device main body 31, thereby making the pipe material of various diameters. 9 can be always held on the same center line. The structure of the pipe material feeding gripping device 30 is well known and will not be described, but it is disclosed in detail in, for example, Japanese Patent Publication No. 47-29836.

Operation Using the index positions A, B, C, D and F shown in FIG. 7, the processing positions are indicated by B and C. The pipe material 9 on the carry-in rail 50 is transferred onto the support device W at the position A of the rest device V by the first transfer device Y. Next, the pipe material 9 is gripped by the pipe material feeding gripping device 30 of the vertical feed transfer device S, and is axially transferred by the vertical feed transfer device S toward the chucks 8A, 8A whose gripping claws are in the open state. . The gripping device having the same structure as the pipe material feeding gripping device 30 provided in front of the chuck 8A and the pipe material feeding gripping device 30 perform centering, and the gripping claws of the chucks 8A and 8A are closed and clamped. The gripping device 30 for feeding the pipe material of the vertical feed transfer device S is opened and returned to the initial position.

When the carrying-in operation is completed, the electric motor 7 is operated to rotate the rest device body 15 of the rest device V and the index plate 5 of the clamp device U by 72 degrees and stop them. The pipe material 9 that has completed the carry-in operation moves from the position A to the position B. The processing machine 2B (2B indicates a processing machine at the position B) moves forward, the servomotors 3 and 4 operate according to a processing program or sequence, and the processing machine 2B moves forward and backward and the processing machine 2B has a machining blade radial direction. The forward and backward movements of are controlled.

At the position B, the processing of the first step shown in FIG. 1A or 2A is performed. Processing of the end face, outer diameter, inner diameter, and chamfering of the end face are performed. When the processing is completed, the electric motor 7 operates and the first rotary shaft 6 of the clamp device U and the second rotary shaft 14 of the rest device V are moved to 72.
It rotates once and stops. Tube material 9 that has been processed in the first step
Shifts from position B to position C.

The next pipe material 9 transferred to the position A is also transferred to the position B. Next, the other pair of first and second servomotors 3 and 4 are also operated, and the pipe material 9 at the position B is processed in the first step shown in FIG. 1A or 2A. Simultaneously with the processing in the first step, the pipe material 9 at the position C is processed in the second step shown in FIG. 1 (b) or FIG. 2 (b). In this process, in addition to taper thread cutting, processing for finishing the sealing surface is performed.

While the processing of the first step is performed at the position B and the processing of the second step is simultaneously performed at the position C, the above-mentioned first transfer device Y and the vertical feed transfer device S are operated. Then, as described above, the new pipe material 9 is used for the chucks 8A, 8A at the position A.
Clamped to. When the first step at the position B and the second step at the position C are completed, the electric motor 7 is driven again, the index plate 5 rotates 72 degrees, and the processed pipe material 9 is transferred to the position D.

When transferred to the position D, the grip of the chuck 8D at the position D is released. When the opening of the chuck 8D is completed, the tubular material feeding gripping device 30 of the vertical feed transfer device S is advanced to the chuck 8D side in the open state, and after moving to a predetermined position, the tubular material feeding gripping device 30 is closed to close the tubular material 9 To hold. The gripping claws of the chucks 8D, 8D are opened, the longitudinal feed transfer device S is retracted to the initial position by the drive motor 37, and the pipe material 9 is separated by the chuck 8.
The pipe material feeding gripping device 30 is opened. The second transfer device Z transfers the pipe material 9 on the support device W at the position D onto the carry-out rail 52.

The transfer and processing sequence of only one long pipe 9 is as follows. Transfer to the rest device V by the first transfer device Y, carry-in → longitudinal feed to the processing machine side by the vertical feed transfer device and centering → clamp by the chuck 8 → rest device V and clamp device U 7
2-degree indexing transition (from position A to position B) → first step machining → 72-degree indexing transition of rest position V and clamp device U (position B to position C) → second step machining → rest device 72-degree indexing transition of V and clamp device U (from position C to position D) → unclamping of chuck 8 → vertical feed to vertical side by vertical feed transfer device S → second transfer device Z
Transfer from the rest device V, and carry out.

[Other Embodiments] In the above embodiments, the walking arm device 40 was used as an example of a device for transferring the pipe material 9 from the side, but the device is a known so-called lift and carry system. May be. The rest device V takes into consideration the length, weight, size of the factory, etc. of the pipe material 9,
Determine the radix used. Further, if the diameter of the long material to be processed is always constant, the height adjustment of the rest device V is unnecessary, and thus the screw type jack device is unnecessary.

[0045]

EFFECT OF THE INVENTION From the first step to the second step while chucking.
Since the workpiece is transferred to the process, misalignment between processes can be reduced and high-precision processing can be performed. Since the processing of the first step and the processing of the second step are performed simultaneously, the processing time can be shortened. Since the long material is loaded and unloaded during processing, the time required for processing preparation and processing after completion of processing is shortened.

Similarly, gripping a long material in standby during processing,
Since the gripping is canceled, the time required for processing preparation and processing after the processing is completed is shortened. By consolidating the processes, the equipment area is compressed, and the initial cost is reduced, which has an economic effect.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a processing target.
FIG. 1A is a sectional view showing the first step, and FIG.
(B) is sectional drawing shown about the 2nd process.

FIG. 2 is an explanatory view showing another example of a processing target, FIG. 2 (a) is a cross-sectional view showing a first step, and FIG. 2 (b) is a second step. It is the sectional view shown.

FIG. 3 is a front view showing a first embodiment of the present invention.

4 shows a clamping device U, EE of FIG.
FIG.

5 is a cross-sectional view taken along the line BB of FIG. 3, showing the rest device V. FIG.

FIG. 6 is a cross-sectional view taken along the line DD of FIG. 3, showing the rest device V.

FIG. 7 shows first and second transfer devices Y, Z,
FIG. 4 is a sectional view taken along the line FF of FIG. 3.

FIG. 8 shows a vertical feed transfer device, which is taken along line CC of FIG.
FIG.

[Explanation of symbols]

 U ... Clamping device V ... Resting device W ... Supporting device Y ... First transfer device Z ... Second transfer device S ... Vertical feed transfer device 1 ... Bed 10 ... Base 2 ... First and second processing machine 3 ... 1st servo motor 4 ... 2nd servo motor 5 ... Index plate 6 ... 1st rotating shaft 7 ... Electric motor 8 ... Chuck 9 ... Long material (long pipe material) 11 ... Screw type jack 12 ... Bearing stand 13 ... Bearing 14 ... Second rotating shaft 15 ... Rest device main body 16 ... Sun gear 17 ... Intermediate gear 19 ... Planetary gear 20 ... Rotating shaft (rotating shaft) 22 ... V-shaped roller 30 ... Pipe material feeding gripping device 36 ... Moving body 37 ... Drive motor 40 ... Walking arm device 50 ... Carry-in rail 52 ... Carry-out rail A, B, C, D, E ... Position

Claims (3)

[Claims] At the same time, two or more processing machines for performing the respective processes and a first rotary shaft are integrally provided so as to be rotatable and indexable, and revolve around the first rotary shaft in common. , The long material carry-in position (A), the processing positions (B, C) facing the two or more machines, and the long material carry-out position (D), and the long material is stopped. A clamping device having a plurality of chucks for gripping a workpiece, a second rotating shaft having an axis parallel to the axis of the first rotating shaft, and being rotatable and indexable in synchronization with the first axis. It is provided and revolves around the second rotary shaft in common to carry in a long material loading position (A), each processing position (B, C) facing the two or more processing machines, and a long material. Positioning is stopped at the carry-out position (D), and is opposite to the second rotating shaft for each revolution of the second rotating shaft. A rest device having a plurality of rotating bodies that rotate once in a direction, a supporting device that is attached to each of the rotating bodies and supports the elongated member, and the first rotating shaft and the second rotating shaft. A synchronizing device for rotating synchronously, and a transfer for loading the long material on the support device at the loading position (A) and unloading the long material on the support device at the loading position (D). A machine tool for processing a long material, comprising a device. 2. The rotary device according to claim 1, wherein the rest device is a rotary indexable rotary disk integrally provided with the second rotary shaft, and a sun gear provided on a fixed side of the machine tool section. A long member comprising a plurality of intermediate gears arranged around the rotary disk and meshing with the sun gear, and a plurality of planetary gears arranged around the rotary disk and meshing with the intermediate gears. Machine tools for processing. 3. The machine tool for processing a long material according to claim 1, wherein a plurality of the rest devices are arranged.