JPH0144252Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is an inner support that evenly supports the inside of a steel pipe when performing pipe end processing with a pipe end processing machine such as a thread cutter, and a hollow processing method for steel pipes (deformed pipes). This invention relates to a hand as a means for holding and moving an object.

[Conventional technology]

Conventionally, the means known as an inner support for supporting the inner diameter part of a steel pipe when performing pipe end processing with a pipe end processing machine includes a means for mechanically converting movement in the A-axis direction into radial movement using a wedge. Another method is to arrange a plurality of pressers movable in the B radial direction along the circumference and expand them using hydraulic pressure to evenly press the inner wall of the steel pipe.

[The problem that the idea attempts to solve]

However, among the conventional techniques mentioned above, the former A is mechanically interlocked, which tends to cause a locking phenomenon at the direction change part, and is supported by a rigid body, making it difficult to maintain consistency with the workpiece. There is a risk of distorting the object, and since the latter B supports the workpiece in partial contact, it may partially distort the workpiece. Therefore, there was a problem in that only the portions in contact with the plurality of pressers were strongly scraped, resulting in the workpiece being formed into a distorted polygon.

The purpose of this invention is to solve the problem in view of the above circumstances.
In addition, even for rotating workpieces such as steel pipes, the inner wall of the workpiece can be evenly pressed and supported.
It is an object of the present invention to provide an inner support that does not cause chatter in a workpiece due to machining and does not cause distortion in the workpiece.

[Means and actions to solve the problem]

The present invention takes the following measures to solve the above problems. That is, the following measures were taken to solve the above problems. That is,
In the inner support that supports workpieces such as steel pipes in tube end processing machines, the inner support is supported movably in the axial direction on the housing and has a through hole drilled in the longitudinal direction of the shaft center on the air supply side. A connecting quill, a drive means for moving the quill in the axial direction, a hole attached to the tip of the quill and bored in the longitudinal direction of the shaft center, and a plurality of radial through holes communicating with the hole. A shaft is rotatably supported on the shaft via a bearing, and a body is provided with a plurality of through holes in the radial direction and has a concave shape at the center of the outer periphery. It consists of a bellows, which is fixed in place and whose central part is removable in the radial direction, expands when air is supplied, and contracts when air is shut off.The work piece, such as a steel pipe, is positioned at a specific position in the axial direction. After that, the quill is advanced to insert the inner support tip into the workpiece, and then the supplied air sequentially passes through the through hole of the quill, the hole in the longitudinal direction of the shaft, and the plurality of through holes in the radial direction. The bellows is supplied from a plurality of through holes in the radial direction of the body, and the supplied air pressure inflates the bellows in the radial direction to evenly press and support the inner wall of the workpiece such as a steel pipe. This is an inner support.

According to the inner support of this invention,
Workpieces such as steel pipes can be evenly pressed and supported from the inner wall of the workpiece, so when machining the ends of workpieces such as steel pipes, chatter is eliminated and uniform machining is possible. .

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

First, a tube end support device for a tube end processing machine in which the inner support of the present invention is used will be described.

FIG. 2 is a front sectional view showing the tube end support device of the tube end processing machine.

In FIG. 2, the base 10 is placed on the bed 100.
1 is placed on the base 101, and a sliding table 102 movable in the Z-axis direction is placed on the base 101. A nut 103 is attached to the lower part of the sliding table 102, and the Z
A ball screw 104 is provided along the axial direction and threaded onto the nut 103. A servo motor 105 is attached to the right side of the ball screw 104. As the ball screw 104 is rotated by the drive of the servo motor 105, the nut 10 is rotated.
3, the sliding table 102 is moved in the Z-axis direction, that is, in the front-back direction. A housing 106 is mounted on the slide table 102. Bearing bushes 109a and 109b that support the quill 108 so as to be slidable in the axial direction are inserted into holes 107a and 107b formed in the axial direction of the housing 106.

Wall portions 106 at the upper front and rear ends of the housing 106
Holes 111a and 111b are formed in holes 111a and 106b, respectively, and guide bars 1 are inserted into the holes 111a and 111b.
11 is mounted parallel to the quill 108. A bracket 110 is attached near the rear end of the quill 108, and a hole bored at the other end of the bracket 110 is inserted into the guide bar 111 so as to be slidable in the Z-axis direction. Guide.

A cylinder 113 is fixed to the rear end side wall of the upper part of the housing 106 and approximately in the middle between the guide bar 111 and the quill 108.
The tip of the third rod 112 is fixed to the middle part of the bracket 110.

A through hole 114 is bored in the axial center of the quill 108, and a joint 115 is screwed into a lid 116 fixed to the rear end of the quill 108.

A cover 117 is fitted to the front of the quill 108, and a bearing bush 109 is fixed to the front flange portion of the cover 117 with bolts 118.

The inner support of the present invention is attached to the tip of the quill 108, and supports a workpiece such as a steel pipe.
Processing is performed by a processing section of a pipe end processing machine (not shown).

The specific structure of the inner support of the present invention will be explained.

FIG. 1 is a sectional view showing the inner support of the present invention. As shown in the figure, the inner support 10 includes a stepped shaft 1, a body 3, a bellows 4, a flange 5, bearings 2a, 2b, a quill 108, and the like as main elements.

In FIG. 1, the stepped shaft 1 is installed in a hole 108a formed at the tip of the quill 108. A hole 1a having approximately the same diameter as the through hole 114 bored in the quill 108 in the axial direction is bored in the axial center of the stepped shaft 1. Bearings 2a and 2b are fitted to both ends of the small diameter shaft portion 1b of the stepped shaft 1, and the bearings 2
A body 3 having a concave central portion is rotatably supported via a and 2b. A plurality of through holes 1c are bored in a direction perpendicular to the axial hole 1a of the small diameter shaft 1b, that is, in the radial direction. Further, a plurality of through holes 3a having the same diameter as the through hole 1c are also bored in the radial direction of the body 3.

Bellows 4 made of a rubber material or the like and capable of expanding and contracting are fixed to both ends of the body 3 so as to cover the outer periphery of the body 3.

A flange 5 is provided on the small diameter shaft portion 1b in front of the bearing 2a, and this flange 5 is
By screwing the nut 7 through the washer 6 to the threaded portion at the tip of the small diameter shaft portion 1b, the body 3 is sandwiched and fixed in the axial direction.

The action of the inner support of the present invention will be explained.

Sliding table 102 of the tube end support device explained in FIG.
is moved forward in the Z-axis direction by a servo motor 105 via a ball screw 104 screwed into a nut 103, and one end of the pipe, such as a steel pipe, is supported by a pipe end processing machine (not shown). The inner support of the present invention is inserted into the inner support 8 as shown in FIG. When air is supplied to a hose (not shown) connected to the right side of the quill 108 via a joint 115, the air passes through the through hole 114 of the quill 108, the hole 1a of the shaft 1, the through hole 1c, and the through hole 3a in order. Pressure is applied to the inside of the bellows 4, which is made of a rubber material or the like and can be expanded and contracted. When pressure is applied to the inside of the bellows 4, since the central recess of the body 3 and the bellows 4 are free, the bellows 4 expands against the central recess of the body 3 as shown in the figure.
The outer periphery of the bellows 4 is spaced apart as shown by the dashed dotted line and uniformly abuts against the inner wall of the pipe 8, such as a steel pipe, so that the pipe 8 is evenly supported by pressure. In addition, 2
Bellows 4 and body 3 are in a state like the dotted chain line
There is an air pocket between the central recess and the central recess.

When the body is inserted into a steel pipe or the like, the bellows is in close contact with the body. However, the bellows may swell and sag due to air leakage. If the bellows is inserted in this state, there is a risk that the bellows will rub against the inner wall of the steel pipe or the like and be damaged. Therefore, in order to prevent the bellows from sagging, the center of the body is made into a recess, and the center of the bellows is recessed inward from the outer diameter of the body. Therefore, the bellows will not protrude outside the outer diameter of the body unless air is supplied and the bellows expands. In addition, the bending of the body itself due to its own weight affects the machining accuracy of the workpiece, so it is necessary to reduce the weight as much as possible. is the concave part.

Next, after a predetermined process is performed, the bellows 4 contracts and returns to its original state by removing air.
The support for the pipe 8 is released.

Note that the inner support of the present invention can also be used as a hand that holds and moves the inner surface of a hollow workpiece such as a steel pipe. In other words, when carrying in the central workpiece from the inner support side (tube end support machine side), first hold it on the inner support, advance the inner support toward the spindle, and then move the other end of the hollow workpiece to the spindle. A usage method in which the device is held on the side is also conceivable.

〔effect〕

As described above, according to the inner support of the present invention, the inner support is movable in the axial direction, and the body portion at the tip of the inner support is rotatable. Furthermore, a bellows that expands and contracts is fixed to this body, so even workpieces such as steel pipes that are rotatably attached to the main shaft of a machine tool can be used even if the length of the workpiece changes. , it is possible to respond to changes in the length, and to press and support the workpiece from the inner wall at the optimum position.

Further, since the inner wall of the workpiece such as a steel pipe is evenly pressed and supported by the bellows, there is no chatter during processing, and uniform processing can be expected. Furthermore, since the bellows presses the steel pipe evenly over the entire support surface, even a particularly thin steel pipe can be supported without distorting the steel pipe.

Furthermore, by making the central part of the body concave, it is possible to prevent the bellows from sagging, and the weight of the body can also be reduced.

Furthermore, the inner support of the present invention serves to prevent the intrusion of coolant, chips, etc. used during steel pipe processing, and also has a sealing effect.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an inner support of the present invention, and FIG. 2 is a front sectional view showing a tube end support device of a tube end processing machine. 1...Stepped shaft, 1a...hole, 3...body, 1
c, 3a... through hole, 4... bellows, 10...
Inner support, 101... bed, 102...
... Base, 103 ... Sliding table, 104 ... Ball screw, 105 ... Servo motor, 106 ...
Housing, 108... Quill, 114... Through hole.

Claims (1)

[Scope of utility model registration request] In the inner support that supports workpieces such as steel pipes in tube end processing machines, the inner support is supported movably in the axial direction on the housing and has a through hole drilled in the longitudinal direction of the shaft center on the air supply side. A connecting quill, a drive means for moving the quill in the axial direction, a hole attached to the tip of the quill and bored in the longitudinal direction of the shaft center, and a plurality of radial through holes communicating with the hole. A shaft is rotatably supported on the shaft via a bearing, and a body is provided with a plurality of through holes in the radial direction and has a concave shape at the center of the outer periphery. It consists of a bellows, which is fixed in place and whose central part is removable in the radial direction, expands when air is supplied, and contracts when air is shut off.The work piece, such as a steel pipe, is positioned at a specific position in the axial direction. After that, the quill is advanced to insert the inner support tip into the workpiece, and then the supplied air is inserted into the through hole of the quill,
The air pressure is supplied from the plurality of radial through holes of the body by sequentially passing through the longitudinal hole of the shaft and the plurality of radial through holes, and the supplied air pressure inflates the bellows in the radial direction. An inner support that is designed to evenly press and support the inner wall of a workpiece such as a steel pipe.