JP3695854B2 - Taper thread rolling head for pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a taper thread rolling head for pipes. More specifically, the present invention relates to a taper thread rolling head in which a rolling roller is automatically retracted so that a pipe to be processed can be taken out after completion of thread rolling on the pipe to be processed.
[0002]
[Prior art]
Conventionally, when connecting a steel pipe for water pipe using a pipe joint, a pipe taper screw 2 is processed at the end of the steel pipe 1 and connected using a joint 3 as shown in FIG. In this case, the taper screw is processed by a cutting method and a plastic processing method. The present invention relates to a thread rolling head in the latter case.
[0003]
In order to plastically process the taper screw, a taper screw rolling head as shown in FIG. 9 is used. This taper thread rolling head 4 has a plurality of annular grooves corresponding to a desired screw cross section and a rolling forming groove having a taper circumferential surface equal to a desired taper slope, as shown in FIG. A plurality of the attached rollers 5 are inclined on the circumference of the cylindrical housing 6 at an inclination angle corresponding to an effective diameter lead angle of a desired screw with respect to the axis of the tube 7 to be processed, and the axial positions thereof They are shifted by a predetermined pitch.
[0004]
Then, by fixing the head 4 and pushing the work tube 7 between the rollers 5 while rotating, the work tube 7 is drawn in the direction of the arrow A by the lead angle of the roller 5, and a taper screw is formed on the outer periphery thereof. Is formed by rolling. Note that rolling is possible even if the head 4 is rotated without rotating the tube 7 to be processed.
[0005]
[Problems to be solved by the invention]
In such a thread rolling head, at the end of the thread rolling process, the thread formed at the time of machining and the groove of the rolling roller mesh with each other. For this, the pipe to be processed must be reversed and taken out. For this reason, there is a problem that the work becomes complicated and the work efficiency deteriorates.
[0006]
In view of the above-described conventional problems, an object of the present invention is to provide a taper thread rolling head for a pipe that makes it very easy to take out a pipe to be processed after thread rolling.
[0007]
[Means for Solving the Problems]
In the taper thread rolling head for pipes of the present invention, a plurality of thread rolling rollers 16 having a taper circumferential surface equal to a desired taper gradient are arranged in a circumferential manner in the housing 10, and the pipe to be machined. In the taper thread rolling head for pipes, in which a taper screw is rolled on the outer periphery of the pipe to be processed 22 by being pushed between the thread rolling rollers while rotating 22, eccentric bearings provided on both sides of the housing 10 are provided. Both ends of the thread rolling roller 16 are supported by an eccentric bearing 17 rotatably supported by the front cover 12 and the back cover 13 to be held, and the thread rolling roller 16 is moved in the radial direction of the housing 10. A rotor 15 capable of rotating the eccentric bearing 17 is provided in the housing 10 so that the eccentric bearing 17 is rotated. Provided an automatic round-up mechanism to expand move use roller 16 in the radial direction, characterized by being easily taken out of the processing tube 22 after processing ends.
[0008]
In addition, the automatic cutting mechanism includes a rotor driving arm 19 attached to the rotor 15 so as to enlarge and move the thread rolling roller 16 in the radial direction of the housing 10, and the rotor driving arm. A sliding member 33 that engages with the arm 19 and slides in an arc shape along a groove provided in the housing and has a cam groove 34, and a pin 30b that engages with the cam groove 34 of the sliding member 33 are provided. A cam lever 29 having a cam driven surface 30a at one end and a cam lever 29 having a cam driven surface 30a at the other end and pivotally supported by a pin 31 at the center, and a cam 29a formed on the cam driven surface 30a of the driven lever 30; And a lever 24 that presses and swings against the tube to be processed 22 to press the cam rod 29 when processing is completed.
[0009]
In addition, a screw diameter adjusting mechanism is provided in which the relative position of the engaging portion between the rotor driving arm 19 and the sliding member 33 is adjusted so that the screw diameter to be rolled onto the work tube 22 can be adjusted. Features. The screw diameter adjusting mechanism includes an adjusting knob 21b having an eccentric pin 21a provided on the rotor driving arm 19 and a groove engaging with the eccentric pin 21a, and an eccentricity provided on the sliding member 33. It is characterized by comprising a pin engaging lever 36. In addition, in order to adjust the processing length of the screw to be rolled onto the tube to be processed 22, an adjusting portion that can be translated is provided at an intermediate portion of the lever 24 that is pressed by the end of the tube to be processed 22. It is characterized by.
[0010]
By adopting this configuration, it is possible to obtain a taper thread rolling head for pipes that makes it very easy to take out a workpiece after thread rolling.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 are views showing an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a rear view, and FIG. FIG. In each figure, reference numeral 10 denotes a housing. The housing 10 is assembled with an intermediate member 11 in which a sector part is integrally formed with a cylindrical part, and a front cover 12 and a back cover 13 that hold an eccentric bearing are assembled by screws 14 respectively. It is fixed. A fan-shaped portion is also formed integrally with the back cover 13. As shown in FIGS. 2 and 4, the housing 10 accommodates a rotor 15 that can rotate in contact with the inner periphery of the intermediate member 11 and a plurality of screw rolling rollers 16.
[0012]
The thread rolling rollers 16 are arranged on the eccentric bearings 17 respectively held by the front lid 12 and the back lid 13 so as to be rotatable via a shaft 18 and at equal intervals on the same circumference. The eccentric bearing 17 is eccentrically formed in a disc portion 17a supported by the front lid 12 or the back lid 13, is provided with a shaft hole 17b, and a lever 17d having a pin 17c at the tip is formed.
[0013]
The rotor 15 is formed with a plurality of grooves 15 a that engage with the pins 17 c of the eccentric bearing 17. Further, as shown in FIG. 1, a rotor driving arm 19 is attached to the rotor 15 with a screw 20 through a window 12 a formed in the front cover 12. By rotating the rotor 15 by the arm 19, the eccentric bearing 17 is rotated through the groove 15 a and the pin 17 c, and the screw rolling roller 16 can be moved in the radial direction of the housing 10. . The rotor driving arm 19 is provided with an adjusting knob 21b having an eccentric pin 21a as shown in FIG.
[0014]
Further, as shown in FIG. 2, the back cover 13 is engaged with a stopper 23 that is substantially the same diameter as the tube 22 to be processed and is slidable in the central axis direction of the housing 10 and a pin 23 a provided on the corresponding metal 23. A lever 24 that is driven in this manner is pivotally supported by the pin 25. Further, a bottomed hole 27 through which the bush 26 is inserted is inserted through the back cover 13 and the intermediate member 11, and a cam rod 29 biased by a spring 28 is inserted into the bottomed hole 27, and the cam rod 29 is engaged with the lever 24 and is driven to be pressed. The lever 24 is divided in half in the middle, and a part of the lever 24 can be overlapped and fixed with a screw 24a, and can be fixed in parallel with the longitudinal direction of the lever 24 through a long hole 24b. Yes.
[0015]
The cam rod 29 is formed with a slope 29a that serves as a cam. A cam driven surface 30a that abuts the slope is provided at one end, a pin 30b is provided at the other end, and a follower is pivotally supported by a pin 31 at the center. A lever 30 is provided between the intermediate member 11 and the back cover 13.
[0016]
In addition, two arc-shaped guide grooves 32 and 32 'centering on the center of the housing 10 are formed in the fan-shaped portion of the intermediate member, and the slide is guided and slidable in the guide grooves 32 and 32'. A member 33 is provided. A cam groove 34 that engages with the pin 30b of the driven lever 30 is formed on one surface of the sliding member 33, and an eccentric pin engaging lever 36 that is pivotally supported by the pin 35 is provided at the top. The eccentric shaft 21a provided on the arm 19 for driving the rotor is detachably engaged. The eccentric pin 21a, the adjustment knob 21b, and the eccentric pin engaging lever 36 constitute a screw diameter adjusting mechanism 21. It is composed. The sliding member 33 is biased by a spring 37 in the direction of arrow F in FIG.
[0017]
The operation of the present embodiment configured as described above will be described with reference to FIGS. In FIG. 6, the housing and some members are not shown. First, when the workpiece 22 is pushed in from the state in which the workpiece 22 is inserted from the front as shown in FIG. 2, the workpiece 22 is rotated by the thread rolling roller 16 as shown in FIG. It is drawn in the direction of arrow B while being made. At the same time, the stopper 23 is also pushed out to the workpiece tube 22 and rotates the lever 24 in the direction of arrow C as shown in FIG.
[0018]
When the lever 24 rotates, the cam rod 29 is pressed at the tip of the lever 24 and moved in the direction of arrow D against the urging force of the spring 28 as shown in FIG. When the cam rod 29 moves in the direction of arrow D, the cam driven surface 30a of the driven lever 30 that is in contact with the inclined surface 29a slides down the inclined surface 29a of the cam rod 29 and rotates the driven lever 30 in the direction of arrow E, so that the pin 30b is moved. Move upward.
[0019]
When the pin 30b moves upward, the inclined surface 34a of the cam groove 34 of the sliding member 33 engaged with the pin 30b is released from the restraint of the pin 30b. As a result, the sliding member 33 moves in the direction of arrow F by the pulling force of the spring 37. Then, the rotor driving arm 19 also moves together with the sliding member 33 via the eccentric pin 21a engaged with the eccentric pin engaging lever 36 of the sliding member 33, and the rotor 15 is rotated, as shown in FIG. The pin 17c of the eccentric bearing 17 engaged with the groove 15a of the rotor 15 is moved in the direction of the arrow G, and the lever 17d is rotated from the state shown in FIG. 16 is isolated from the work tube 22. Thereby, the workpiece tube 22 can be pulled out without rotating.
[0020]
The screw diameter adjusting mechanism 21 adjusts the initial position of the rotor 15 by changing the relative position between the sliding member 33 and the rotor drive arm 19 by adjusting the position of the eccentric pin 21a by rotating the knob 21b. can do. Thereby, the radial position of the rolling roller 16 can be adjusted via the eccentric bearing 17, and the screw diameter of the screw to be rolled can be adjusted. Further, the lever 24 can change the pressing time of the cam rod 29 by translating the intermediate overlapping portion and adjusting the lever 24 back and forth, thereby adjusting the screw round-up time.
[0021]
【The invention's effect】
According to the taper thread rolling head for pipes of the present invention, an automatic up-cutting mechanism is provided for expanding and moving the thread rolling roller in the radial direction via a lever pressed at the end of the pipe to be processed at the end of machining. As a result, it is possible to easily take out the tube to be processed after the processing is completed, and it is possible to contribute to the improvement of the screw processing efficiency.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, showing the embodiment of the present invention.
FIG. 3 is a rear view showing the embodiment of the present invention.
FIG. 4 is a rear view showing a state in which the rear lid of the embodiment of the present invention is removed.
FIG. 5 is a diagram for explaining the operation of the embodiment of the present invention.
FIG. 6 is an exploded perspective view for explaining the operation of the embodiment of the present invention.
FIG. 7 is a view for explaining the operation of the eccentric bearing in the embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a pipe connection method for connecting a conventional steel pipe using a joint.
FIG. 9 is a sectional view showing a conventional taper thread rolling head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Housing 11 ... Intermediate member 12 ... Front cover 13 ... Back cover 14, 20 ... Screw 15 ... Rotor 15a ... Groove 16 ... Screw rolling roller 17 ... Eccentric bearing 17a ... Disc part 17b ... Bearing hole 17c ... Pin 17d ... Lever 18 ... Shaft 19 ... Rotor drive arm 21 ... Screw diameter adjusting mechanism 21a ... Eccentric pin 21b ... Adjusting knob 22 ... Workpiece tube 23 ... Wat 23a, 25, 31, 35 ... Pin 24 ... Lever 26 ... Bush 27 ... bottom holes 28, 37 ... spring 29 ... cam rod 30 ... driven lever 30a ... cam driven surface 32, 32 '... guide groove 33 ... sliding member 34 ... cam groove 36 ... eccentric pin engaging lever

Claims (5)

A plurality of thread rolling rollers (16) having a taper circumferential surface equal to a desired taper gradient are arranged in a circumferential shape in the housing (10), and the thread rolling is performed while rotating the work tube (22). In a taper thread rolling head for a pipe, the taper thread is rolled on the outer periphery of the processed pipe (22) by being pushed between rollers for use in the pipe,
The thread rolling roller (16) is mounted on an eccentric bearing (17) provided on both sides of the housing (10) and rotatably supported by a front cover (12) and a back cover (13) holding the eccentric bearing. A rotor (15) capable of rotating the eccentric bearing (17) so as to support both ends and move the thread rolling roller (16) in the radial direction of the housing (10) is provided in the housing (10). An automatic up-cutting mechanism is provided for moving the thread rolling roller (16) in a radial direction via a lever (24) pressed at the end of the pipe to be processed at the end of processing. A taper thread rolling head for pipes, which makes it easy to take out the processed pipe (22). The automatic cutting mechanism includes a rotor driving arm (19) attached to the rotor (15) so as to expand and move the thread rolling roller (16) in the radial direction of the housing (10), and the rotor A sliding member (33) that engages with the drive arm (19), slides in an arc along a groove provided in the housing, and has a cam groove (34), and the sliding member (33) A driven lever (30) having a pin (30b) engaged with the cam groove (34) at one end and a cam driven surface (30a) at the other end and pivotally supported by a pin (31) at the center; A cam rod (29) formed with a cam (29a) that abuts the cam follower surface (30a) of the lever (30), and when the machining is completed, the cam rod (29) is pressed against and swung by the work tube (22). Comprising a lever (24) for pressing. Claim 1 taper pipe thread rolling head according to symptoms. A screw diameter adjusting mechanism that adjusts the relative position of the engaging portion between the rotor driving arm (19) and the sliding member (33) to adjust the screw diameter to be rolled onto the work tube (22). 3. A taper thread rolling head for pipes according to claim 2, which is provided. The screw diameter adjusting mechanism includes an adjusting knob (21b) having an eccentric pin (21a) provided on the rotor driving arm (19), and a groove engaging with the eccentric pin (21a). The taper thread rolling head for pipes according to claim 3, characterized by comprising an eccentric pin engaging lever (36) provided on the member (33). In order to adjust the processing length of the screw rolled on the processed pipe (22), the adjusting section can be moved in parallel with the intermediate portion of the lever (24) pressed at the end of the processed pipe (22). 2. A taper thread rolling head for pipes according to claim 1, wherein:

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