JPH06179030A - Taper screw form rolling machine for tube - Google Patents

Abstract

PURPOSE:To execute drawing and taper screw forming in a same time by using a form rolling roller of a simple constitution. CONSTITUTION:Plural numbers of form rolling rollers 100 formed with a parts with a roll forming groove 101 respectively having a taper circumferential surface part equal to a required taper gradient and to be attached inclining against a tube axial line by an inclining angle corresponding to a required screw effective diameter lead angle, and a part with a drawing groove 103 adjoining to the part with the groove for roll forming and having a taper circumferential surface part of a gradient larger than the taper gradient, are disposed in the circumferential direction by respectively deviating the position of axial direction by a prescribed pitch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling machine for a taper screw for a pipe material formed in, for example, a gas pipe or a pipe joint.

[0002]

2. Description of the Related Art Generally, there are cutting and plastic working as methods for forming a taper screw at the end of a pipe material. Since the thread is formed by cutting the thick part of the pipe into a taper shape by lathe etc., the useful wall thickness of the thread groove bottom is much simpler than the wall thickness of the non-cut part in terms of mechanical strength. As a result, the pipe becomes thin, and there is a problem in strength or corrosion resistance of the pipe.

On the other hand, in the plastic working, the end portion of the pipe material is plastically deformed in advance to taper gradient of a desired taper screw by another mechanism, and then the taper screw is formed by a rolling roller having a thread. Therefore, the number of processes is large, and the thread rolling machine equipped with both the drawing mechanism and the thread rolling mechanism has a complicated structure and becomes large in size, and it is easy to handle in situations where gas pipe construction and other relocations are frequently performed. Was not.

In view of the present situation, the applicant of the present invention has previously disclosed in Japanese Patent Laid-Open No. 63-16826 that a pipe material that can be simplified and downsized even in the mechanism of the rolling machine, which is expected to have a small number of steps in plastic working. We proposed a taper thread rolling method for steel. According to this, the rolling forming screw portion having the taper peripheral surface portion equal to the desired taper gradient and having the lead angle substantially equal to the effective diameter lead angle of the desired screw, and the rolling forming screw portion adjacent to the rolling forming screw portion. Then, a head having a plurality of rolling rollers formed of a draw forming screw portion having a tapered peripheral surface portion having a taper gradient larger than the taper gradient and a pipe material are relatively rotated, and the rolling material is rotated. By relatively moving the forming roller or the pipe material, the rolling roller gradually performs taper drawing processing and rolling screw processing from the end surface of the pipe material.

This will be described below with reference to FIGS. The rolling roller 10 has a taper peripheral surface portion equal to a desired taper gradient and has a lead forming angle θ having a lead angle θ substantially equal to the effective diameter lead angle of a desired screw (for example, 1 ° with respect to the roller axis X). Tapered peripheral surface having an angle of 47 ')
And a draw forming screw portion 3 adjacent to the screw portion 1 and having a tapered peripheral surface portion (for example, 8 °) having a larger gradient than the taper gradient. 7 is a head 9 (8th
It is a shaft fitting hole for mounting the roller 10 in the drawing).

8 and 9 show the rolling roller 1 described above.
FIG. 2 is a side view and a cross-sectional view of a cylindrical head 9 having 0 mounted thereon, and a plurality of rollers (five in the figure) 10 are fitted to shafts 11 and fixed at appropriate positions. Each shaft 11 is arranged in a shaft through hole 17 formed in the head bottom portion 9 ′ so as to surround the axis Y on the circumference of a predetermined circle a centered on the longitudinal axis Y of the head 9. Shaft 1
Reference numeral 1 has peripheral grooves 12 at both ends thereof, and after being inserted into the through hole 17, the movement of the shaft 11 in the axis line X direction is stopped by being fitted by the ring pin 14. On the other hand, a head cover 15 is attached to the opening of the head 9, and the head cover 15 has the same number of shaft through holes 17 'as the number of the shafts 11 and a tube hole 19 for passing a molded pipe 30 (FIG. 10). And are formed. Similar to the end of the shaft 11 protruding from the head bottom 9 ', the ring pin 14' is fitted into the end protruding from the head cover 15. Shaft 11 and rolling roller 10 mounted as described above
Is rotatably supported on the head 9.

FIG. 10 is a side view schematically showing a taper screw rolling mechanism 20 having a head 9.
A head 9 having a head is connected to a motor 13 as a driving means for giving rotation. The motor 13 and the head 9 are
The motor support base 21 is installed slidably in the axis Y direction (that is, the longitudinal direction) with respect to the base portion 23 of the mechanism 20 via the motor support base 21, and is mounted on the slide shaft 25 formed in the base portion 23.
Moves. The tube 30 to be molded is clamped by a holding member 27 provided on the base 23. Reference numeral 29 denotes a clamp handle for clamping the pipe 30 on the holding member 27, and the pipe 30 is clamped and fixed by being manually rotated.

The tube 30 to be molded is inserted through the holding member 27 from the right side in the drawing, and then the rolling roller 1
After contact with 0, the longitudinal axis of the tube 30 is fixed coaxially with the motor 13 and the axis Y of the head 9 by the clamp handle 29. As described above, the rolling roller 10 includes the drawing screw portion 3 (the screw thread 5 is omitted in the drawing) having the tapered peripheral surface portion having a larger gradient than the completed taper gradient as described above, and thus the inserted tube is inserted. It is not necessary for 30 to be in contact with the peripheral surface of the draw forming screw portion 3 and the roller end surface 31 at the contact point (that is, edge), but it is sufficient to engage on the peripheral surface of the screw portion 3.

After fixing the pipe 30, the operator is
The head 9 rotates by activating. Head 9
With each rotation, the shafts 11 rotatably mounted on the head 9 rotate about the axis Y, and the main body of the shaft 11 also rotates about the shaft axis X together with the fitted roller 10. Each roller 10 has a thread 5 as described above.
By having (FIG. 7), the screw 33 is engraved one after another from the end of the pipe 30.

Since the tube 30 is prevented from moving on the axis Y by the holding member 27, the head 9, the motor 13 and the motor support 21 are moved to the right in the figure as the screw 33 is continuously engraved. Automatically moving, the tip portion 35 of the tube 30 is eventually guided to the rolling forming screw portion 1 of the rolling roller 10, and a screw having a desired taper gradient is engraved. Then, when the end surface 35 of the tube 30 reaches the end surface 34 of the threaded portion 1 of the rolling roller 10, the motor 13 is stopped to end the series of taper thread rolling steps. When the pipe 30 is removed from the main mechanism 20 after the rolling, the head 9 slides leftward in the figure by reversing the rotation of the motor 13.
Although the screw is disengaged, as another method, the clamp by the holding member 27 may be released and the tube 30 may be manually rotated and removed.

The head 9 equipped with the rolling roller 10 is attached to the tube 3
Instead of moving it towards 0, the motor 13 is moved to the base 23
A mechanism in which the holding member 27 and the clamp handle 29 are fixed to the upper side and move leftward toward the head 9,
Alternatively, the rollers 10 may be slidable on the shaft 11 without being fixed, and each roller 10 may move in the right direction in the drawing together with the engraving of screws (motor, holding member fixing).

[0012]

However, in the above structure, in order to automatically feed the pipe material when it comes into contact with the peripheral surface of the draw forming screw portion when the pipe material is set, the lead angle is set to the rolling roller. It is necessary to provide. That is, it is necessary to process the screw parts 1 and 3 having a predetermined lead angle, and it is difficult to process the rolling roller. In addition, once processing, it is impossible to adjust the lead angle.

Therefore, the present invention achieves the same object by devising the mounting arrangement of the rolling roller without providing the lead angle on the rolling roller itself.

[0014]

In order to achieve the above object, according to the present invention, each has a tapered peripheral surface portion equal to a desired taper gradient and corresponds to a desired effective diameter lead angle of a screw. Drawing forming having a grooved portion for rolling and forming which is attached at an inclination angle with respect to the axis of the pipe material and a tapered peripheral surface portion adjacent to the grooved portion for rolling and forming and having a slope greater than the above-mentioned taper slope. Provided is a taper thread rolling machine for pipe material, which has a head in which a plurality of rolling rollers formed of a grooved portion for use are arranged so that their axial positions are shifted by a predetermined pitch in the circumferential direction.

[0015]

According to the present invention, the rolling roller itself is simply a groove (not a spiral groove but an individual discontinuous circumferential groove).
Is formed, and therefore it is not necessary to form a screw having a lead angle as in the conventional case. Instead, the rolling rollers are shifted by a predetermined pitch in the axial direction and are inclined by an angle corresponding to the lead angle with respect to the tube axis, so that the groove formed in each rolling roller is viewed as if it were the lead as viewed in the axial direction. It forms a continuous spiral groove formed along the corner, so that the pipe to be machined is automatically fed inward by the lead angle effect once it has been eaten. Thereby,
The pipe is simultaneously drawn and threaded.

[0016]

EXAMPLES Examples of the present invention will be described below. FIG. 4 conceptually shows the positional relationship of the rolling roller 100 with respect to the tube 30. Each rolling roller 100 has a grooved portion 103 for drawing and a grooved portion 101 for rolling similar to the rolling roller 10 shown in FIG.
Have and. The diameters of the draw forming grooved portion 103 and the rolling forming grooved portion 101 are basically the same as those of the rolling roller 10 shown in FIG. What is formed on the outer periphery is, as described above, the point of not being a screw but being an independent discontinuous groove.

As shown in the development view of FIG. 6, several identical rolling rollers 100 are arranged in a spiral shape while being shifted by a predetermined pitch a when viewed in the axial direction X. That is, in FIG. 6, the rolling roller 100 shifts backward by the pitch a as shown in the order of →→→→→, and this →
The →→→→ are actually arranged in a spiral shape as shown in FIG. 4 (only three rolling rollers are shown). as a result,
The pipe 30 moves to the rolling roller 100 as it is fed in the axial direction.
The contacts come in the order of → → → →, and the ends are drawn and taper screw processing (rolling) is applied.

As shown in FIG. 5, each rolling roller 100 is mounted so as to be inclined with respect to the axis line X by a predetermined angle α corresponding to the lead angle as shown in FIG. For example, the support shaft 111 of the rolling roller 100 may be attached so as to be inclined with respect to the head 9. By configuring as above,
The lead angle effect is equivalently obtained even though the lead angle is not given to the rolling roller itself.
Once bite into the first or second rolling roller, the lead automatically feeds thereafter.
The processing procedure, method and the like are exactly the same as those of the prior art shown in FIG.

FIGS. 1 to 3 show an embodiment of a rolling threading machine incorporating the rolling roller arrangement shown in FIGS. Since the basic structure is the same as that shown in FIG. 10, description thereof will be omitted. As is apparent from FIG. 1, the rolling roller 100 is displaced by the pitch a when viewed in the axis X direction.
Although the support shaft 111 of the rolling roller 100 is inclined by a predetermined angle α with respect to the head (frame body) as described above,
4 and 5, the angle α is exaggeratedly drawn, and is actually a very small angle (eg, about 1 °).

In the thread rolling machine shown in FIGS. 1 to 3, a centering tool 120 for fixing the roundness (roundness of the outer circumference) of the pipe 30 to be processed is fixedly provided on the head 9 (head bottom 9 '). It The centering tool 120 basically applies the principle of a pencil sharpener, and has a main body 123 having a conical tapered opening 121 (however, in the drawing, it looks like a cylindrical hole because the taper angle is very small). It is detachably attached to the head 9 via 125.

As shown in FIGS. 2 and 3, the main body 123 has a cutter blade (blade) 137 protruding into the opening 121 thereof.
Is buried. The amount of protrusion in the radial direction is the adjustment bolt 127.
Can be adjusted by. Therefore, the cutter blade 137
Is, for example, a long hole 129 into which the adjustment bolt 127 is inserted.
Is formed. The tube 30 is inserted into the opening 121,
Alternatively, by relatively rotating the centering tool 120,
The outer circumference of the pipe 30 is cut just as if using a pencil sharpener, and while the feed in the further axial direction, the cut surface goes deep as a guide, so the cut outer peripheral surface becomes the axis of the pipe. It becomes a virtually perfect circle (true circle) regardless of the relationship. Incidentally, 131 is a stopper (contact) that regulates the insertion position of the tube 30.

In thread rolling, in order to perform high-precision machining, it is premised that the roundness of the outer circumference of the pipe is ensured, and for that purpose, the centering tool 120 as described above is integrally formed. Assembly is extremely useful.

[0023]

According to the present invention, the lead screw is not formed on the rolling roller itself, and the conventional two steps (drawing step and thread rolling step) are performed by devising the arrangement as described above. Since only one process is required, the manufacturing time can be shortened and the structure of the rolling machine itself can be simplified and downsized so that it can be easily moved between construction sites. Further, the rolling roller itself can be manufactured easily and at low cost.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a taper thread rolling machine according to the present invention.

FIG. 2 is a left end view of FIG.

3 is a cross-sectional view of the centering tool shown in FIG.

FIG. 4 is a diagram showing an arrangement relationship between a rolling roller and a tube according to the present invention.

FIG. 5 is a development view showing a mounting position of a rolling roller.

FIG. 6 is a plan development view for explaining a spiral arrangement of a rolling roller.

FIG. 7 is a partial vertical sectional view of a conventional rolling roller.

8 is a partial vertical sectional view of a conventional head equipped with the rolling roller of FIG.

9 is a transverse sectional view taken along line IX-IX in FIG.

FIG. 10 is a schematic view of a conventional taper screw rolling mechanism.

[Explanation of symbols]

 30 ... Tube 100 ... Rolling roller 111 ... Support shaft

Claims (1)

[Claims] 1. A rolling forming groove, each having a tapered peripheral surface portion equal to a desired taper gradient, and being attached at an inclination angle corresponding to a desired effective diameter lead angle of a screw with respect to an axis of a pipe material. A plurality of rolling rollers formed by a grooved portion for drawing and a grooved portion for drawing forming which is adjacent to the grooved portion for rolling forming and has a tapered peripheral surface portion having a gradient greater than the taper gradient. A taper thread rolling machine for pipes, having a head whose axial position is shifted by a predetermined pitch.