JPH0569298A - Grinding method of tubular member having circumferential groove and its supporting device - Google Patents

Abstract

PURPOSE:To achieve grinding operations at the position apart from a face plate and which a tubular member being supported by a chuck claw in a secure manner when the end part of the tubular member of an elbow or the like is supported by the chuck pawl fitted to the face plate and ground. CONSTITUTION:A chuck pawl 13 is fitted to a face plate 10 connected to a rotary driving shaft 11. A distance between a tip supporting part 16 and the face plate 10 is secured by a long body part 15 of the chuck pawl 13. A groove wall 1a of the circumferential groove 1 swollen inward of the tubular member (E) is inserted into a groove part 17 of a tip supporting part 16 where the end part provided with a circumferential groove 1 of a tubular member (E) is outside fitted, and the end part of the tubular member (E) is coaxially supported with a rotational axis of the face plate 10 by the tip supporting part 16. A grinding material such as sand paper is tightly pressed against the end part including the circumferential groove 1 of the tubular member (E).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for grinding a tubular member having a circumferential groove such as a pipe or a joint used in a grooving piping method, and an apparatus for supporting the tubular member when carrying out the method. ..

[0002]

2. Description of the Related Art The grooving piping method is well known in the prior art, and FIG. 3 shows a joint J and a pipe P connected by the same method. As is clear from this figure, in the joint J and the pipe P used in the same method, the circumferential groove 1,
1'is provided, and straight portions 2, 2'are provided at the tip end side portion following the circumferential grooves 1, 1 '. And, in the grooving method, a joint J concentrically opposed to each other is used.
Between the end of the pipe P and the end of the pipe P, the ring-shaped sealing gasket 3 is covered over the straight portions 2 and 2'on the joint J side and the pipe P side. Split mold clamping ring 4, 4 such as split or split
And the projections 5 and 5 provided on the tightening rings 4 and 4 are fitted into the circumferential grooves 1 and 1'on the joint J side and the pipe P side, and the tightening rings are not shown in this state. The gasket 3 is pressed against the straight portions 2 and 2'by tightening with a fastener such as a tightening bolt.

On the other hand, the peripheral groove 1 provided in the joint J uses a grooving machine (not shown), and while the joint J is rotated, its end portion is pressed against the groove-forming surface of the die roller by the pressure roller. It is formed through the process. For this reason, the end of the grooved joint J is often scratched or peeled off due to the grooving. Tube P
The same is true for. When such scratches and plating peeling occur at the end of the joint J and the end of the pipe P, in the grooving piping construction method as shown in FIG. 3, the gasket 3 is surely attached to the straight portions 1, 1 '. It becomes difficult to adhere to, which causes a defective seal.

Therefore, conventionally, for the joint J and the pipe P, a grinding step has been carried out in which the peripheral grooves 1 and 1'are formed and then the ends are ground to finish the surface smoothly.
This grinding step was carried out by holding the joint J or pipe P after grooving in one hand and holding the belt sander in the other hand and applying the belt sander to the joint J or pipe P.
Further, a method of applying sandpaper to the end of the joint J or the pipe P attached to the chuck claws of the lathe while rotating the pipe may be used.

[0005]

However, the former method is inevitably a dangerous work due to the violent vibration of the hand and the influence of scattered dust. Further, in the latter method, since the face plate to which the chuck claws of the lathe are attached and the ends of the joints J and the pipes P attached to the chuck claws are extremely close to each other, the sandpaper is attached to the joints J and the pipes P.
There is a high risk of your hand touching the face plate when it is applied to the edge of the.

As described above, conventionally, there has been a problem that the grinding of the ends of the joint J and the pipe P always involves danger.

The present invention has been made in view of the above problems, and when the end portion of the tubular member with a circumferential groove such as the joint or the pipe is ground, the grinding work can be performed safely. It is an object to provide a method and a support device for a tubular member with a circumferential groove.

[0008]

The invention according to claim 1 relates to a method for grinding a tubular member having a circumferential groove, which is characterized in that the end of the tubular member having a circumferential groove at its axial end is Outer fitting to the tip support portion of the body portion of the plurality of chuck claws attached to the face plate with the body portion projecting forward of the face plate, and in the groove portion recessed in the tip support portion of each chuck jaw. By fitting the groove wall of the peripheral groove that bulges inward of the tubular member, and by supporting the end portion of the tubular member concentrically with the rotation axis of the face plate by these tip support parts, the face plate in this supported state While driving the tubular member to rotate together with the face plate, an abrasive such as sandpaper is applied to the end portion of the tubular member including the circumferential groove.

A second aspect of the present invention relates to a supporting device for a tubular member with a circumferential groove, which is characterized in that the face plate is connected to the rotary drive shaft, and the face plate is mounted at a plurality of positions at equal intervals in the circumferential direction. A chuck claw that is movable in a radial direction of the face plate, wherein the chuck claw has a body protruding from a mounting seat portion seated on the face plate toward the front of the face plate, and a tip end supported by a tip end of the body part. And a tubular member having a circumferential groove at the axial end on the outer periphery of the distal end supporting portion, the tubular member being inwardly fitted to the distal end supporting portion when the tubular member is externally fitted to the distal end supporting portion. The groove portion into which the groove wall of the bulged peripheral groove can be fitted is provided as a recess.

[0010]

According to the method of grinding a tubular member with a circumferential groove according to the present invention, the end portion of the tubular member, which is the grinding point, is supported by supporting the end portion of the tubular member by the tip supporting portion of the body of the chuck claw. Are separated from the face plate by a distance corresponding to the length of the body. Therefore, it becomes possible to grind the end portion of the tubular member at a position apart from the face plate. Further, since the groove wall of the circumferential groove that bulges inward of the tubular member is fitted into the groove portion of the tip support portion of the chuck claw, the groove wall helps to reliably position the tubular member on the chuck claw. ..

In the apparatus for supporting a tubular member with a circumferential groove according to a second aspect of the present invention, when the end portion of the tubular member is supported by the tip end supporting portions of the body of the plurality of chuck claws, the face plate and the end portion of the tubular member are separated from each other. The distances are separated by a distance corresponding to the length of the body. In addition, by fitting the groove wall of the circumferential groove that bulges inward of the tubular member into the groove of the tip support portion of the chuck claw, the tubular member is reliably positioned on the chuck claw, and the tubular member is centrifuged during rotation. The situation that the core is displaced by force is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A supporting device for a tubular member with a circumferential groove according to an embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 10 is a circular face plate, the center of which is
It is connected to a rotary drive shaft 11 of a mechanical device having a rotary drive shaft such as a lathe and a positioner. Guide grooves 1 extending in the radial direction at three positions on the face plate 10 at equal intervals in the circumferential direction.
2 is formed. Reference numeral 13 denotes a chuck claw, which is a mounting seat portion 14 and a body portion 15 which is long projected from the mounting seat portion 14.
And a tip support portion 16 provided at the tip of the body portion 15, and the body portion 1 is provided on the outer periphery of the tip support portion 16.
5, the groove portion 17 that crosses the groove 5 is recessed, and further, the entire portion of the tip end support portion 16 on the tip end side of the groove portion 17 is
The tapered portion 18 is formed by stealing the corner portion. The groove portion 17 is formed by fitting a groove wall 1a that bulges inwardly of the peripheral groove 1 formed at the axial end portion of the elbow E with a neck as an example of a tubular member that is an object to be ground. It has a possible groove width (axial groove width).

The chuck claw 13 has a mounting seat portion 14 mounted on the face plate 10 through a guide groove 12, and in this mounted state, the body portion 15 is projected long toward the front of the face plate. Further, the mounting seat portion 14 is equipped with a head bolt 19 with a hole for fastening and fixing, and the mounting seat portion 14 is fixed to the face plate 10 by tightening the head bolt with a hole 19. There is. Therefore, when the head bolts with holes 19 are loosened, the chuck claws 13 can be moved in the radial direction of the face plate 10 along the guide grooves 12, and by performing such a moving operation, the three chuck claws 13 can be moved. Cooperate with those chuck claws 13
It is possible to support the end portion of the elbow E supported by ... Concentrically with the rotation axis of the face plate 10. The centripetal function of the plurality of chuck claws 13 is similar to the centripetal function of a known scroll chuck used in a lathe generally used for cutting and the like. Therefore, it is possible to directly apply the mechanism adopted in the known scroll chuck to the above-mentioned three chuck claws 13 ... By doing so, the position of each chuck claw 13 can be adjusted. The work of aligning the center of the end portion of the elbow E with the rotation axis of the face plate 10 can be simplified.

Next, a method of grinding the end portion of the elbow E, which is an example of a tubular member, using the supporting device described above will be described.

In this method, first, the chuck claws 13 ... Are moved closer to the rotation axis of the face plate 10 so that their tip support portions 16 ...
The outer ends of the peripheral grooves 1 are externally fitted to their tip support portions 16 ... Then, the chuck claws 13 ... Are moved radially outward from the rotation axis of the face plate 10 to move them away from each other,
The elbow E is inserted into the groove portions 17 of the tip support portions 16 ...
The groove wall 1a of the circumferential groove 1 which bulges inward is fitted in the end wall of the elbow E by the tip end supporting portions 16 ...
It is supported concentrically with the axis of rotation of 0. After that, the rotary drive shaft 11 is driven to rotate the elbow E supported by the chuck claws 13 ...
An abrasive material such as a belt sander or sand paper is applied to the end portion including the peripheral groove 1 and the desired portion is ground to finish smoothly.

In this embodiment, since the tip end supporting portions 16 of the chuck claws 13 are located away from the face plate 10 by the long body portion 15, the end portion of the elbow E is also located at a position sufficiently away from the face plate 10. It is supported by the tip support portion 16. For this reason, there is no risk of a hand touching the face plate when the abrasive such as a belt sander or sandpaper is applied to the end of the elbow E, and the grinding work can be performed safely.
The operation of applying the abrasive to the end of the elbow E may be performed by a method of mechanically moving the abrasive with respect to the end of the elbow E.

In this embodiment, the groove wall 1a of the circumferential groove 1 which bulges inward at the end of the elbow E is fitted into the groove portions 17 of the tip supporting portions 16 ... of the chuck claws 13 ... Since the position of the center of gravity of the elbow E is deviated to a position eccentric from the rotation axis during grinding, the elbow E vibrates due to centrifugal force or falls off from the tip support 16 ... Without doing
Can perform safe grinding work. Further, the tip end supporting portion 16 has a tapered portion 18 formed by stealing the corner portion of the tip end side portion of the groove 17 so that the tip end side portion does not interfere with the inner surface of the elbow E. .. Therefore, since the tip end supporting portion 16 has a tapered portion 18 in the entire tip end side portion than the groove portion 17, even a curved joint such as the elbow E can be easily and surely supported by the chuck claws 13. You can get the advantage.

In this embodiment, the case where the end portion of the necked elbow E having the circumferential groove 1 is ground has been described.
The object to be ground is not limited to the elbow E with a neck, and it is possible to select an elbow as a commonly used pipe joint bent in an accurate arc shape, a straight pipe, and other tubular members. In addition, the chuck claw 13 is the body 1
By further lengthening 5, the tip support portion 16 ...
Can be further removed from the face plate 10.

[0020]

According to the present invention, since the end of the tubular member, which is the grinding point, is supported at a position distant from the face plate, the end of the tubular member is distant from the face plate, such as a belt sander or sandpaper. It becomes possible to apply an abrasive, which has the effect of reducing the danger of the grinding operation and improving safety. In particular,
Since the tubular member is supported by the chuck jaws while the groove wall of the circumferential groove that bulges inward at the end of the tubular member is fitted into the groove portion of the tip support portion of the chuck jaws, the tubular member is supported by the straight pipe. Of course, even if the center of gravity such as the elbow is not located on the axis of rotation, there is no concern that the tubular member will be misaligned or fall off from the chuck claws due to centrifugal force during grinding work. Therefore, there is an effect that safe grinding work can be performed.

[Brief description of drawings]

FIG. 1 is a front view showing a supporting device for a tubular member with a circumferential groove according to an embodiment of the present invention.

FIG. 2 is a side view of the support device in a state in which a chuck claw is cut along a line II-II in FIG.

FIG. 3 is a sectional view of a joint and a pipe connected by a grooving piping method.

[Explanation of symbols]

 1 Circular Groove 1a Groove Wall of Circumferential Groove 10 Face Plate 11 Rotational Drive Shaft 13 Chuck Claw 14 Chuck Claw Mounting Seat 15 Chuck Claw Body 16 Body Tip Support 17 Tip Support Groove E Neck Elbow (Tube) Element)

Claims (2)

[Claims] 1. A tip of the body portion of a plurality of chuck claws attached to the face plate in a state where the body portion projects the end portion of the tubular member having a circumferential groove at the end portion in the axial direction to the front of the face plate. External fitting to the support portion, fitting the groove wall of the circumferential groove bulging inward of the tubular member into the groove portion provided in the tip support portion of each chuck claw, and tubular at these tip support portions. Supporting the end portion of the member concentrically with the rotation axis of the face plate, and rotating the face plate in this supported state to rotate the tubular member together with the face plate, while sandpaper or the like is applied to the end portion of the tubular member including the circumferential groove. The method for grinding a tubular member with a circumferential groove, comprising: 2. A face plate connected to a rotary drive shaft, and chuck claws mounted at a plurality of positions on the face plate at equal intervals in a circumferential direction and movable in a radial direction of the face plate, wherein the chuck claw includes: The body portion is projected from the mounting seat portion that is seated on the face plate toward the front of the face plate, and a tip end support portion is provided at the tip end portion of the body portion, and an axial end portion is provided on the outer periphery of the tip end support portion. When a tubular member provided with a circumferential groove is externally fitted to the tip support portion, a groove portion into which the groove wall of the circumferential groove that bulges inward of the tubular member can be fitted is provided as a recess. A supporting device for a tubular member with a circumferential groove, characterized in that