JPS5937699B2 - thread rolling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method in which one or more rolling rollers, out of a plurality of rolling rollers arranged around a material to be rolled, are connected to a head to form a material to be rolled. The structure is configured to be able to feed and move in the radial direction or substantially radial direction with respect to the center of the material, and the remaining rolling rollers are provided in a fixed position with respect to the head, and the center of these rolling rollers is set to the center of the material to be rolled. The head is configured to be movable relative to the rolled material so as to align with the axial center of the rolled material, so that relative rotation between the rolled material and the rolling roller group causes the outer circumferential surface of the rolled material to be aligned with the axis of the rolled material. This invention relates to improvements in thread rolling machines for rolling threads.

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 in the past to form threads by forcibly rotating the formed 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 location where the thread is to be processed. From the old 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 forcibly pushed into the inside of these rolling rollers from one end in the axial direction to form a thread. (thread rolling machine).

○ 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.

○ Thread rolling is performed from one end in the axial direction of the material to be rolled, and of the male threads provided on each rolling roller, only the receiving end of the material to be rolled is substantially thread-rolled. Because 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 circumferential surface of the material to be rolled increases, all the rolling rollers are simultaneously moved radially inward by the same distance. Since a feeding mechanism is required for feeding and moving, 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 roller in a fixed position relative to the head, the feeding mechanism for the movable rolling roller becomes simple, and the overall structure can be significantly simplified.

An object of the present invention is to improve the operability at the start of rolling in such a thread rolling machine with a simple structure.

Therefore, in the above-mentioned thread rolling machine, the present invention configures the peripheral surface of each rolling roller in a wave shape consisting of a group of annular protrusions spaced at equal small intervals in the axial direction, and The forming roller is held by the head with a torsion angle equal to the effective diameter lead angle of the desired rolling screw, and the head and the formed material to be rolled are configured to be relatively movable in the axial direction of the formed material to be rolled. By doing so, the above objective was achieved.

In other words, if a male thread with a lead angle equal to the effective diameter lead angle of the desired rolling screw is formed on the circumferential surface of each rolling roller, the phase of the rolling roller will affect the outer circumferential surface of the material to be rolled. Since the position of the contacting male thread is shifted in the axial direction of the material to be rolled, each thread rolling is done before the start of thread rolling so that a series of thread grooves are rolled by the male thread of the rolling roller group. It is necessary to match the pitch of the male screws by adjusting the phase of the rollers, which has the disadvantage of poor operability at the start of thread rolling. A mechanism is required to rotate the rolling rollers so that they do not shift.

In this regard, in the present invention, the circumferential surface of each rolling roller is made into a wave shape consisting of annular protrusions, and these wave-shaped rolling rollers are arranged around the head with an appropriate twist angle, and the head and the rolled object are formed into a shape. By configuring the material to be relatively movable in the axial direction of the material to be rolled, a substantially male thread is created, so if the mutual positional relationship of each roller is set at the manufacturing stage, each roller can be easily moved. Regardless of the phase of the forming rollers, the axial position of the annular protrusion in contact with the outer circumferential surface of the material to be formed remains constant, making the pitch adjustment as described above unnecessary.

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

1 is three freely rotatable rolling rollers 2, 2A...
・The head is arranged in an annular shape.

The rolling rollers 2, 2A... The two rolling rollers 2A... are pivotally supported in a fixed position relative to the head 1 at the final shaping position, and the other rolling rollers 2A... One rolling roller 2 is pivotally supported by a movable piece 1b that is housed in a slide 1 in a rectangular tube portion 1a formed in a part of the head 1, and is screwed into the rectangular tube portion 1a. A threaded shaft 3 with a bundle 3a is inserted into the rolling rollers 2, 2A, etc. to form a rolled material a such as a metal round bar or pipe.
The feeder is configured to feed and move radially inward toward the axis of the feeder.

4 is a slider inserted between the movable piece 1b and the tip of the screw shaft 3; 5 is a connecting bottle 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 front rad 1 has a long hole 7 formed in a part of the head 1, which is perpendicular to the axis of the material to be rolled a and which is long in the horizontal direction, and extends through the long hole 7. The pin 9 is inserted and fixed into the main body frame 8 in such a state that the rectangular tube portion 1
via a convex portion 10 extending substantially along the longitudinal direction of the elongated hole 7 connected to the lower side of a, and a concave groove 11 on the main body frame 8 side into which this convex strip 10 is slidably fitted, It is supported so as to be freely movable with respect to the main body frame 8.

The main body frame 8 includes the rolling rollers 2, 2A...
A lathe, etc. having a chuck that supports a part of the formed material a to be rolled inserted into the group (a part not shown is mounted so as to be movable in the axial direction of the formed material to be rolled a) , head 1
The material to be rolled and the formed material a are configured to be able to move relative to each other in the axial direction of the formed material to be rolled a.

In the thread rolling machine having such a structure, in this embodiment, as shown in FIGS. 2 and 3, the circumferential surface of each of the rolling rollers 2, 2A... The rolling rollers 2, 2A are arranged in a wavy shape consisting of a group of annular protrusions 2a, 2Aa, etc. with a small interval equal to . 2a...
・.

2Aa... In order to give a torsion angle θ equal to the effective diameter lead angle of the desired rolling screw, the rolling rollers 2, 2A.
...The center of the group (also the axis of the material to be rolled during thread rolling).

), the annular protrusions 2a, 2Aa, . . . are arranged to form a series of thread grooves. .

In Fig. 3, 12... are bearings. Next, the thread rolling procedure according to the above embodiment will be explained.

The main body frame 8 is attached 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, insert a predetermined material to be rolled, such as a metal tube or a metal round bar, into the inner side of the rolling rollers 2, 2A, etc., and position the part in the axial direction where threading is to be performed. After setting the parts correctly, a part of the material to be rolled a is fixedly supported by a chuck such as a lathe so that there is no movement in the radial and axial directions.

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, the center of the group of rolling rollers 2, 2A, etc. coincides with the center of the formed material a to be rolled (1 ), by pressing the rolling roller 2, the centers of both will automatically match, and the annular protrusion 2a of all the rolling rollers 2゜2A..., 2ka . . . comes into contact with the outer peripheral surface of the rolled material a at three places, and in this state, each annular projection 2a . . . , 2ka
Since the pitch, etc. of .

Thereafter, a lathe or the like is driven to rotate to forcibly rotate the material to be rolled a, and at the same time the bundle 3a is rotated to continuously press the movable rolling roller 2 against the material to be rolled a.

As a result, the rolling rollers 2, 2A... group and the material to be rolled a rotate relative to each other, and each roller 2.2A...
As A...... rotates, the head 1 moves in the axial direction of the rolled material a, relative to the rolled material a, by the pitch of the desired rolling thread. .

A desired thread is rolled on the outer circumferential surface of the formed material a to be rolled.

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 formed material a to be rolled also remains unchanged. Along with the thread forming on the outer periphery of the material to be rolled, the elongated hole 7
Within the range of , the entire head 1 automatically moves relative to the rolled material a from the solid line position to the imaginary line position in FIG.
Automatic alignment function is demonstrated.

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 rolled material a, and the bundle 3a is rotated in the opposite direction. Operate to return the movable rolling roller 2 to its original position and remove the rolled material a.

In the above embodiment, when configuring the head 1 and the rolled material a to be movable relative to each other in the axial direction of the rolled material a, the main body frame 8 is attached to a lathe or the like to form the rolled material. Each roller 2, 2A,
With the rotation of..., rollers 2, 2A...
Annular description of the outer circumferential surface 2a...

2ka... Group feeding action (Thus, the head 1 is configured to move with respect to the rolled material a in the axial direction of the rolled material a, but this is ,Conversely,
The main body frame 8 prevents the head 1 from moving in the axial direction.
By providing the chuck side in a fixed position and configuring the chuck side that supports the rolled material a to be movable in the axial direction of the rolled material a with respect to the main body frame 8,
Of course, the same effect can be obtained even if the rolled material a is configured to move in the direction of the fine core of the rolled material a with respect to the head 1.

Moreover, if tapered rollers are used as the rolling rollers 2, 2A, . . . , it is also 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, in which Fig. 1 is a partially cutaway front view, Fig. 2 is a partially cutaway plan view, Fig. 3 is a sectional view of the main part, and Fig. 4 shows the operation. It is a diagram. a... Rolled material, 2, 2A... Rolling roller, 2a, 2Aa... Annular protrusion, θ...
...Torsion angle.

Claims (1)

[Claims] 1. A plurality of rolling rollers 2 arranged around a formed material to be rolled a supported so as to be prevented from moving in the radial direction.
, 2A..., one or more of the rolling rollers 2 are configured to be able to be fed and moved relative to the head 1 in the radial direction or substantially radial direction with respect to the center of the rolled material a. At the same time, the remaining rolling rollers 2A... are provided in a fixed position with respect to the head 1, and the center of these rolling rollers 2, 2A... a
The head 1 is aligned with the axis of the rolled material a.
By rotating the forming material a relative to the rolling rollers 2, 2A, etc., a screw can be rolled onto the outer circumferential surface of the forming material a. In this thread rolling machine, each of the rollers 2, 2A has annular protrusions 2a, 2A, whose circumferential surfaces are equally spaced in the axial direction.
a... These wave-shaped rolling rollers 2, 2A are held in the head 1 with a torsion angle θ equal to the effective diameter lead angle of the desired rolling screw. A thread rolling machine characterized in that the head 1 and the material to be rolled a are configured to be relatively movable in the axial direction of the material to be rolled a.