JPS5937700B2 - thread rolling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for forming a plurality of rolling rollers each having a male thread having a lead angle equal to the effective diameter lead angle of a desired rolling screw arranged around a fixedly supported material to be rolled. Among them, one or more of the rolling rollers is configured to be movable relative to the head in a radial direction or substantially radial direction with respect to the center of the material to be rolled, and the remaining rolling rollers are positioned relative to the head. The rolling rollers are provided in a fixed state, and the head is configured to be movable relative to the rolled material so that the center of the rolling roller group coincides with the axis of the rolled material. This invention relates to an improvement in a thread rolling machine that forms threads on the outer circumferential surface of a material to be rolled by relative rotation between a section and a group of rolling rollers.

A thread rolling machine that plastically forms threads on the outer circumferential surface of the material to be rolled by the relative rotation between the group of rolling rollers and the material to be rolled inserted into the roller group, is capable of forming threads on the outer peripheral surface of the material to be rolled. The forming material to be rolled is configured to be movable in the radial direction, and with the forming roller group moved radially outward, the forming material to be rolled is inserted into the inside position, and the forming roller group is moved. It has been well known to form threads by forcibly rotating the material to be formed around its axis while feeding the material radially inward.

In this thread rolling machine, the material to be rolled is inserted in advance to a predetermined position inside the rolling roller group, and the thread is simultaneously rolled over the entire length in the axial direction of the part where the thread is to be processed. , a conventional so-called push type thread rolling machine (a plurality of rolling rollers are provided in a fixed position on the same circumference, and the material to be rolled is placed inside a group of these rolling rollers.
This type of thread rolling machine rolls a thread by forcibly pushing it in from one end in the axial direction.

0 A huge amount of force is required to push and move the formed material to be rolled, and the power consumption for thread rolling is large.

0 The material to be rolled is thread-rolled from one end in the axial direction, and of the male threads provided on each rolling roller, only the receiving end of the material to be rolled is substantially thread-rolled. Since it controls the action, local deterioration of the male thread due to wear etc. occurs quickly.

On the other hand, as the depth of the thread groove formed on the outer peripheral surface of the material to be rolled increases, all the rolling rollers are simultaneously sent radially inward by the same distance. Since a moving feeding mechanism is required, the structure has the disadvantage of being extremely complicated.

The above-mentioned thread rolling machine was developed to eliminate these conventional drawbacks, and is configured so that only as few rollers as possible in the group of rolling rollers can be fed and moved, and the remaining rollers can be moved. By providing the movable rolling roller in a fixed position relative to the head, the mechanism for feeding the movable rolling roller becomes simple, and the overall structure can be significantly simplified.

The present invention aims to improve the operability of such a thread rolling machine at the time of starting thread rolling, and also to improve thread accuracy.

Therefore, the present invention achieves the above object by providing a mechanism for interlocking the rotation of all the rollers in the thread rolling machine described above.

That is, since a male thread having a lead angle equal to the effective diameter lead angle of the desired rolling screw is formed on the circumferential surface of each of the rolling rollers, the outer periphery of the material to be rolled is adjusted for each phase of the rolling roller. The position of the male thread in contact with the surface will be shifted in the axial direction of the material to be rolled, but in the present invention, since the rotation of all the rolling rollers is linked, at the manufacturing stage of the thread rolling machine,
As long as the phases of the rolling rollers are set correctly so that a series of thread grooves are rolled by the male threads of the rolling roller group, there is no risk of the rollers becoming out of phase during subsequent handling. There is no.

Therefore, prior to the start of thread rolling, there is no need for the complicated work of adjusting the pitch of the male threads by adjusting the phase of each rolling roller, improving operability, and even during thread rolling. Since the phases of the rollers do not go out of order due to slip on the material to be rolled, thread accuracy is improved.

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a head in which three rolling rollers 2, 2A, . . . having the same diameter and having a male thread 2a set to a lead angle equal to the effective diameter lead angle of a desired rolling screw are arranged in an annular manner.

Of the group of rolling rollers 2, 2A, two rolling rollers 2A are pivotally supported in a fixed position relative to the head 1 at the final forming position, and the other rolling roller 2 is is pivotally supported by a movable piece 1b that is slidably housed in a rectangular cylinder part 1a formed in a part of the head 1, and the rectangular cylinder part 1a
A threaded shaft 3 with a bundle 3a screwed onto the rolling roller 2, 2A... It is configured to feed inwardly.

4 is a thrust bearing interposed between the movable piece 1b and the tip of the screw shaft 3; 5 is a connecting pin inserted into the movable piece 1b;
Its tip fits into a circumferential groove 3b formed around the entire circumference near the tip of the screw shaft 3.

6 is in contact with the outer surface S of the square tube portion 1a, so that
This is a lock nut that regulates the amount of feed movement of the rolling roller 2, and by changing the screwing position with respect to the screw shaft 3,
The feed movement amount can be adjusted arbitrarily.

The head 1 has an elongated hole 7 that is long in the horizontal direction and perpendicular to the axis of the rolled material a formed in a part of the head 1, and a state in which the elongated hole 7 passes through the elongated hole 7. The pin 9 inserted and fixed into the main body frame 8 and the square tube part 1
via a protruding strip 10 extending substantially along the longitudinal direction of the elongated hole 7 and a concave groove 11 on the main frame 8 side into which the protruding strip 10 is slidably fitted, It is supported so as to be freely movable within the elongated hole 7 relative to the main body frame 8 .

The main body frame 8 is configured to be detachably fixed to a part of a lathe, etc., and has rolling rollers 2, 2A, etc.
A part of the rolled material a inserted inside the group is supported in a fixed position by a chuck (not shown) of a lathe or the like so as not to move in the axial direction and radial direction, and
In this state, the formed material a to be rolled is forcibly rotated around its axis.

In the thread rolling machine having such a structure, in this embodiment,
A portion of freely rotatable support shafts 12, 12A, to which the rolling rollers 2, 2A, etc. are fixed, protrudes outward from one side of the head 1, and the protrusion of these support shafts 12, 12A,... A sprocket 13° 13A... is fixed to the end, and an endless chain 14 is wound around each sprocket 13° 13A... to form a mechanism 15 that interlocks the rotation of all the rolling rollers 2, 2A... , a plate member 1 having a guide ring 16 of a chain 14 pivotally supported on one side of the head 1;
7. Set slurry with long hole.

This plate material 17.
A spring 18 for urging the guide wheel 16 to move in the direction of tension of the chain 14 is interposed between the guide wheel 16 and the head 1 to absorb changes in the tension of the chain 14 due to the feed movement of the roller 2. The tension mechanism 19 is configured to keep the above-mentioned rotation-linked action constant.

In FIG. 3, 20 is a chain case.

Next, the thread rolling procedure according to the above embodiment will be explained.

The main body frame 8 is fixed to a part of a lathe or the like, and the bundle 3a is rotated to return the movable rolling roller 2 to the outside.

In this state, the material to be rolled a is rolled by rolling roller 2゜2A...
After inserting it into the group and setting the correct axial position of the part to be threaded, a part of the material to be rolled a is fixedly supported by a chuck such as a lathe.

Next, the bundle 3a is rotated in the tightening direction to press the rolling roller 2 against the material to be rolled a.

In this case, since the head 1 can freely move within the range of the elongated hole 7, even if the center of the group of rolling rollers 2, 2A, etc. and the center of the material to be rolled a do not match, the rolling By pressing the rollers 2, their centers will automatically match, and the male threads 2a of all the rolling rollers 2, 2A, . . . will come into contact with three locations on the outer peripheral surface of the material to be rolled a.

In addition, since the rotation of each rolling roller 2.2A... is linked, the mutual phase of the rollers 2, 2A... is constant,
There is no need for pitch adjustment by phase correction.

Thereafter, a lathe or the like is rotated to forcibly rotate the formed material a to be rolled, and at the same time, the bundle 3a is rotated to rotate the movable rolling roller 2. is continuously pressed onto the material to be rolled, a, and the thread is rolled by the rolling rollers 2, 2A, etc.

In this case, even in the thread forming process, the position of the rolling roller 2A with respect to the head 1 is of course constant, and the axial position of the material to be rolled a remains unchanged, so As thread forming progresses on the outer circumferential surface of material a, the entire head 1 automatically moves from the solid line position to the imaginary line position in FIG. wandering around,
A self-aligning function between the group of rolling rollers 2, 2A, etc. and the material to be rolled a is exhibited.

Thread rolling is completed when the lock nut 6 comes into contact with the outer surface S of the rectangular tube part of the head 1, so the drive of the lathe etc. is cut off to stop the rotation of the material to be rolled a, and the bundle 3a is moved in the opposite direction. Rotate the movable rolling a roller 2 to its original position and remove the rolled material a.

Incidentally, if a tapered roller is used as each of the rolling rollers 2, 2A, etc., it is naturally possible to roll a tapered thread.

[Brief explanation of the drawing]

The drawings show an embodiment of the thread rolling machine according to the present invention, and FIG. 1 is a partially cutaway front view, FIG. 2 is a rear view, FIG. 3 is a partially cutaway plan view, and FIG. 4 is an operational view. . a... Rolled forming material, 1... Head,
2,2A...Rolling roller, 15...Automatic interlocking mechanism.

Claims (1)

[Scope of Claims] 1. A plurality of rolling rollers 2゜2A. - 5, one or more rolling rollers 2 are configured to be movable relative to the head 1 in the radial direction or substantially radial direction with respect to the center of the material to be rolled a, and the remaining rolling rollers 2A
... are provided in a fixed position with respect to the head 1, and the head 1 is rolled so that the center of the rolling rollers 2, 2A... coincides with the axis of the rolled material a. With a structure that can move freely with respect to the shaped material a, a thread is rolled on the outer peripheral surface of the formed material to be rolled by the relative rotation between the formed material to be rolled and the group of rolling rollers 2, 2a, etc. A thread rolling machine characterized in that it is provided with a mechanism 15 that interlocks the rotation of all the rollers 2, 2A, . . . . 2. The rotation interlocking mechanism 15 is composed of a chain mechanism. 2. The thread rolling machine according to claim 1, further comprising a tension mechanism 18 for keeping the action constant.