JPH07204750A - Formation of flange part in end parts of pipe and its device - Google Patents

Abstract

PURPOSE:To enable working to pipes having different diameters with one device by laying a conical surface at the right angle to the axis of the pipe to form a flange part after expanding the end part of the pipe by inclining the conical surface of a conical body being changeable to the setting position at a specific angle to the axis of the pipe. CONSTITUTION:The pipe is held with a jaw 3. The conical surface of the sintered hard metal-made conical body 4 for expanding held with a chuck 2 is placed so as to become 35-40 deg. angle to the longitudinal axis of the pipe A frame 1 for holding the chuck 2 is rotated. The flange part 11 of the pipe is pressed to the conical body 4 with the jaw 3 to expand the end part 11 of the pipe with the conical body 4. The conical surface of the conical body 4 is placed so as to become 90 deg. angle to the longitudinal axis of the pipe. The flange part 11 of the pipe is pressed to the conical body 4 with the jaw 3 to form the end part of the pipe to the flange part 11 with the conical body 4. At the time of forming the pipe having different diameter, the chuck 2 is shifted to a prescribed position in the frame 1 to execute the formation of the flange part.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an improved method and apparatus for forming a collar at the end of a metal pipe at an angle substantially perpendicular to the longitudinal axis of the pipe.

[0002]

2. Description of the Related Art Conventionally, pipes for air-conditioning equipment for buildings, sanitary equipment for facilities, water supply and sewerage equipment, pool-related equipment, piping equipment for various plants, pipes for ships, offshore structures, stanchions, etc. Both straight pipes and curved pipes are annular flanges that have flanges formed at the ends of the pipes that have an angle substantially perpendicular to the longitudinal axis of the pipe, but abut on each other via packing, and are attached to the outside of the flange in advance. Can be tightened from both sides of the collar with tightening tools such as bolts and nuts.
It is done normally. In this case, the flange must be welded to the end of the pipe, or the end of the pipe must be processed to form the flange.

Various methods have been devised for forming the flange portion of the end of the pipe, but Patent No. 1629403 (Patent Publication No. 2-53) of GS Hydro Oy, Finland.
No. 129) is common. This method is a method for forming an end portion of a metal pipe into a flange portion substantially perpendicular to the longitudinal axis of the pipe, and the pipe end portion is formed so as to be formed into a flange portion perpendicular to the longitudinal axis of the pipe. 2 work to expand
The above steps are performed, and the first step is a step of expanding the pipe end at an angle of 35 to 40 °. In the first step, the pipe end is flanged by the device using the expanding cone. In the second step, the pipe end is further expanded at an angle of about 90 ° with respect to the longitudinal axis of the pipe. In the method for forming the flange of the pipe end, the auxiliary head is added to the top of the expanding cone. After mounting the auxiliary head coaxially with the expanding cone or replacing the expanding cone with another auxiliary head different from the above, the second step of expanding work is performed. To do.

[0004]

The feature of the above invention is that two types of expanding cones are used in the method of forming the flange portion of the pipe end, and the pipe end is formed by the first expanding cone in the first step. After expanding the portion to an angle of 35 to 40 °, in the second step, the auxiliary head is placed on the top of the expanding cone of the first step, or the expanding cone is different from the other. The auxiliary head is replaced, and the auxiliary head is attached coaxially with the expanding cone, that is, a second expanding cone is configured, and the second step of the expanding operation is performed. Therefore, in this method and apparatus, each expanding cone is required for each step, and during the transition from the first step to the second step, the auxiliary head that becomes the second expanding cone is attached or separately. Requires coaxial replacement installation of the auxiliary head.

Further, in the above-mentioned GS Hydro Oy patent, only pipe processing with a single diameter is planned, and therefore the shaft of the expanding cone in each step is the same as the flange that supports it. It is only replaced coaxially with the hole. In order to process pipes of different diameters, it has been proposed to provide a flange with a plurality of expanding cone shaft bearing holes radially from its longitudinal axis, but this is not practical because the flange structure becomes complicated. It was The present invention uses the same expanding conical body for the work of these two steps, and moves the central axis of rotation of this conical body so that the transition from the first step to the second step can be performed quickly. In addition, by making it possible to change the installation position of the expanding cone with respect to the longitudinal axis of the pipe in multiple stages, it is possible to easily perform the collar part forming of pipes having different kinds of diameters. To do
To aim.

[0006]

According to the present invention, in a method for forming a flange portion of a pipe end, a single expanding cone is revolved around the longitudinal axis of the pipe to be processed while the center of rotation of the cone is rotated. In a method of forming a flange portion on a pipe end by rotating the shaft around an axis and pressing the conical surface of the conical body against the pipe end, in the first step, the conical surface is relative to the longitudinal axis of the pipe. The central axis of rotation of the conical body is installed so that the end of the pipe is widened so that the angle of the conical surface is about 35 to 40 °. The central axis of rotation of the cone was moved so as to form an angle of °, and a flange portion was formed by expanding the pipe end portion at an angle substantially perpendicular to the pipe longitudinal axis,
The present invention relates to a method for forming a flange portion of a pipe end.

According to the present invention, in the pipe collar forming method, the installation position of the expanding cone is changed in multiple steps in a direction perpendicular to the longitudinal axis of the pipe in accordance with the diameter of the pipe to be processed. It was made possible. Further, in the above method, a variable jaw for mounting and tightening several kinds of pipes having different diameters is prepared as a mounting part of the pipe to be processed.

The present invention is also an apparatus for forming a pipe end portion into a flange portion substantially perpendicular to the longitudinal axis of the pipe in a two-step process, comprising a frame, a chuck and a jaw, Is mounted so that the chuck is always aligned with the portion of the pipe to be molded and is arranged to rotate about the longitudinal axis of the pipe and reciprocate along the longitudinal axis relative to the device. , The chuck accommodates the expanding cone, and the central axis of rotation of the cone is such that the conical surface of the cone that contacts the flange is at an angle of 35 to 40 ° with respect to the longitudinal axis of the pipe. And a second bearing portion for supporting the central axis of rotation of the cone so that the conical surface forms an angle of about 90 ° with respect to the longitudinal axis of the pipe. , The jaw is processed Inside the apparatus, means for fixing the power pipe so that the end portion serving as the flange portion is projected toward the chuck, and reciprocatingly driving the frame toward the jaws while rotating the frame along the longitudinal axis of the pipe. It is characterized by being provided in.

In the collar forming apparatus of the present invention, the frame is mounted so that the chuck reciprocates in the direction perpendicular to the rotation center axis of the frame and is fixed at a predetermined position. On the other hand, the jaw is characterized by having adjusting means for appropriately tightening pipes having different diameters.

[0010]

Since the present invention is constituted as described above, in the conventionally known method of forming the flange portion of the pipe end portion which comprises two steps,
By changing the rotation center axis position of the single expanding cone in two steps, it is possible to perform the expanding work more quickly with a smaller number of parts than in the conventional case. Further, the expanding cone is, depending on the diameter of the pipe to be processed,
Since it is mounted so as to reciprocate in the direction perpendicular to the center axis of rotation of the frame and fixed at a predetermined position in the frame, it is possible to mold the flange portion of pipes of different diameters with a single model.

[0011]

FIG. 1 shows an embodiment of the present invention. An apparatus for carrying out the method of the present invention is an apparatus for forming a pipe end portion into a flange portion substantially perpendicular to a longitudinal axis of the pipe in a two-step process, and includes a frame 1, a chuck 2, and a jaw 3. Equipped with. The frame 1 mounts the chuck 2 in such a way that it is always aligned with the part on which the collar 10 of the pipe is to be molded, and rotates about the longitudinal axis of the pipe and is reciprocated along said longitudinal axis relative to the device. Is located in.

The chuck 2 accommodates an expanding cone 4 made of a super-hard metal having a rotating central shaft 5 extending vertically from a frustoconical body, and abutting against the flange 11 of the pipe. The conical surface of 4 is 35 to the longitudinal axis of the pipe.
A first bearing 6 for supporting the central axis of rotation 5 of the cone at an angle of 40 °, and rotation of the cone so that the conical surface is at an angle of about 90 ° with respect to the longitudinal axis of the pipe. A second bearing portion 7 that supports the central shaft 5 is provided in the chuck 2.

As shown in the enlarged view of FIG. 2, the first bearing portion 6 and the second bearing portion 7 of the chuck 2 are opened at predetermined positions of the chuck body block in the direction in which the flange portion of the pipe is to be formed. It is formed by a U-shaped or half-moon shaped groove hole, and the tip of the rotation center shaft 5 of the expanding cone 4 is fitted into the groove hole of the first or second bearing portion in each working process, and then expanded. Start work. The base of the expanding cone 4, that is, the center axis of rotation 5
The other end of the bearing is supported by another bearing block 8, which moves in the slot 9 of the chuck 2 between the first process position and the second process position and is located in the chuck at each process position. Retained.

As another embodiment of the device of the present invention, as shown in FIG. 3, the tip end and the base end of the rotation center shaft 5 of the expanding cone 4 are rotatably supported by a wagon bearing portion 10. The bearing portion 10 is appropriately moved in the chuck 2 by using a driving device such as a hydraulic device so that the expanding cone 4 is in the first and second process positions for forming the pipe collar portion, that is, the collar portion of the pipe. 11 where the conical surface of the conical body 4 abutting 11 is at an angle of 35-40 ° with respect to the longitudinal axis of the pipe, and the conical surface is about 90 with respect to the longitudinal axis of the pipe.
After arranging and fixing at the position where the angle becomes °, it is possible to start the expansion work of each.

The jaws 3 are the ribs 1 to be processed.
The end portion to be 1 is fixed so as to project toward the chuck. As conceptually shown in FIG. 1, the apparatus is provided with means for reciprocating along the longitudinal axis of the pipe towards the jaws 3 while rotationally driving the frame 1 using conventional conventional techniques. To be

The present invention thus allows a single expanding cone to revolve about the longitudinal axis of the pipe being machined while rotating about the central axis of rotation of said cone to provide a convolution of said cone. Regarding the method of forming the flange portion on the pipe end by pressing the conical surface on the pipe end, in the first step shown in FIG. 4, the conical surface forms an angle of 35 to 40 ° with respect to the longitudinal axis of the pipe. After installing the center axis of rotation of the conical body and expanding the pipe end, the second part shown in FIG.
In the step, the central axis of rotation of the cone is moved so that the conical surface forms an angle of about 90 ° with respect to the longitudinal axis of the pipe, and the pipe end is expanded to an angle substantially perpendicular to the longitudinal axis of the pipe. Mold the open collar.

The second feature of the present invention is that the installation position of the expanding cone can be changed in multiple steps in the direction perpendicular to the longitudinal axis of the pipe in accordance with the diameter of the pipe to be processed. Is. In order to have the above action, the apparatus of the present invention is mounted so that the frame 1 reciprocates the chuck 2 in a direction perpendicular to the rotation center axis of the frame 1 and is fixed at a predetermined position as shown in FIG. ing. As a method of attaching the chuck 2, the block 13 of the chuck 2 is attached to the dovetail groove 12 provided on the surface of the frame 1 so as to reciprocate in a direction perpendicular to the rotation center axis of the frame 1.
It is fixed at an appropriate position by an appropriate means such as a stop bolt 14. On the other hand, on the pipe side to be processed, a jaw 3 having an adjusting means for appropriately tightening pipes having different diameters is prepared. The first step and the second step of the method of the present invention performed on pipes of different diameters are shown in FIG. 7 and FIG. 8, respectively.

As shown in FIG. 9, the jaw 3 having an adjusting means for appropriately tightening pipes having different diameters is provided with a large number of jaw blocks 15 which can be retracted and retracted on the inner surface of a cylindrical cavity provided in the jaw body on the circumferential surface. The pipes are arranged, and the pipes are fixed by pressing them against the circumferential surface of the pipe that is machined together by the hydraulic jack 16. The jaw block 15 reciprocates in a direction perpendicular to the longitudinal axis of the pipe, but in order to fix a smaller diameter pipe, an auxiliary block 17 matching the diameter of the selected pipe can be detachably attached to the tip of each jaw block 15. Can be attached.

[0019]

As described above, according to the present invention, the flange portion at the end of the pipe is formed by performing the two-step expanding work using the single expanding cone. Further, it is possible to process pipes having different diameters with the same device, and it is possible to quickly respond to various different needs of the owner at a construction site or the like. Setting of each process of expansion work and conversion between processes are
Basically, it is manually performed by an operator, but mechanical means or automatic control means conventionally used within the scope of the present invention can be appropriately used.

[Brief description of drawings]

FIG. 1 is a conceptual view of a pipe end flange forming device according to the present invention.

FIG. 2 is a partially enlarged view of a first bearing portion and a second bearing portion of a chuck in an embodiment of the device of the present invention.

FIG. 3 is an enlarged view of a bearing portion of another embodiment of the device of the present invention in which the wagon-shaped bearing portion rotatably supports the central axis of rotation of the expanding cone.

FIG. 4 is a conceptual diagram showing a first step of the method of the present invention.

FIG. 5 is a conceptual diagram showing a second step of the method of the present invention.

FIG. 6 is a conceptual diagram showing a state in which a chuck is movably attached to a frame of an apparatus according to an embodiment of the present invention.

FIG. 7 is a conceptual diagram showing the first step of the method of the present invention carried out on pipes having different diameters.

FIG. 8 is a conceptual diagram showing a second step of the method of the present invention, which is carried out on pipes having different diameters.

FIG. 9 is a front view of a jaw used in the device of the present invention.

[Explanation of symbols]

 1 frame 2 chuck 3 jaw 4 expanding cone 5 rotation center shaft 6 first bearing portion 7 second bearing portion 8 bearing block 9 groove hole 10 wagon-shaped bearing portion 11 pipe collar portion 12 dovetail groove 13 block 14 stop bolt 15 Jaw block 16 Hydraulic jack 17 Auxiliary block

Claims (5)

[Claims] 1. A single expanding cone is revolved around a longitudinal axis of a pipe to be machined and is rotated about a central axis of rotation of the conical body so that a conical surface of the conical body is connected to a pipe end portion. In the method of forming a flange portion on the end portion of a pipe by pressing the pipe, in the first step, the center of rotation of the cone is adjusted so that the conical surface forms an angle of 35 to 40 ° with respect to the longitudinal axis of the pipe. After the shaft is installed and the end of the pipe is expanded, in the second step, the center axis of rotation of the cone is moved so that the conical surface forms an angle of about 90 ° with respect to the longitudinal axis of the pipe. A method for forming a flange portion of a pipe end, wherein the flange portion is formed by expanding the pipe end portion at an angle substantially perpendicular to the pipe longitudinal axis. 2. The installation position of the expanding cone can be changed in multiple steps in a direction perpendicular to the longitudinal axis of the pipe according to the diameter of the pipe to be processed. A method for forming a flange portion of the end portion of the pipe described. 3. An apparatus for forming a pipe end into a flange portion substantially perpendicular to the longitudinal axis of the pipe in a two-step process, comprising a frame (1), a chuck (2) and a jaw (3). The frame (1) mounts the chuck (2) such that the chuck (2) is always aligned with the portion of the pipe collar (10) to be molded, and rotates relative to the device about the longitudinal axis of the pipe. The chuck (2) is arranged so as to be reciprocally driven along the longitudinal axis, and the chuck (2) accommodates the expanding cone (4) and is in contact with the flange (10). A first bearing part (6) for supporting the central axis of rotation (5) of the cone so that the conical surface forms an angle of 35-40 ° with respect to the longitudinal axis of the pipe; Inside the chuck (2) is the second bearing part (7) that supports the central axis of rotation (5) of the cone so that it forms an angle of approximately 90 ° with the axis. Provided, said jaws (3) is the flange part Paibu to be processed (10)
Fixed so that the end of the jaw is projected toward the chuck, and while rotating the frame (1), the jaw
A device for forming a flange portion of a pipe end, characterized in that means for reciprocating along the longitudinal axis of the pipe toward (3) is provided in the device. 4. The frame (1) is mounted such that the chuck (2) is reciprocated in a direction perpendicular to the rotation center axis of the frame (1) and fixed at a predetermined position. The device according to claim 3. 5. Device according to claim 4, characterized in that the jaws (3) have adjusting means for appropriately tightening pipes of different diameters.