JPS5937701B2 - thread rolling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that among a plurality of rolling rollers attached to a head,
At least one rolling roller is configured to be able to feed and move in the radial direction relative to the axis of the material to be rolled, which is inserted into the group of rolling rollers, and the remaining rolling rollers are A roller is fixedly provided at a final forming position where a desired thread is rolled in the material to be rolled,
In addition, the head is configured to be movable relative to the rolled material so that the center of the rolling roller group and the axis of the rolled material coincide, and the rolling roller group and the rolled material are The present invention relates to an improvement in a thread rolling machine configured to roll a thread on the outer circumferential surface of a material to be rolled by relative rotation with the material to be rolled.

As a thread rolling machine that rolls threads on the outer circumferential surface of the material to be rolled by the relative rotation between a group of rolling rollers attached to the head and the material to be rolled inserted into the head, it is possible to The rolling rollers are configured to be movable in the radial direction of the material to be rolled, and with the group of rolling rollers moved radially outward, the material to be rolled is inserted into the roller group, and the material to be rolled is inserted into the rolling roller group. It has been well known to form threads by forcibly rotating a material to be formed around its axis while moving a group of forming rollers 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 group from one end in the axial direction to form a thread. ○ It takes a huge amount of force to push and move the material to be rolled, and the power consumption for thread rolling is large.

○ The thread is rolled 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. 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 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 it is possible to feed and move only as few rollers as possible among the group of rolling rollers, and the remaining rollers are moved by the head. The feeding mechanism of the rolling rollers is simple by providing the rolling rollers in a fixed position and allowing the head to freely move so that the rolling roller group and the material to be rolled are automatically aligned. It has the advantage that the overall structure can be significantly simplified.

The present invention aims to improve workability and screw precision by automating the feeding movement of the rolling roller in such a thread rolling machine with a very simple structure.

That is, the present invention provides the above-mentioned thread rolling machine, comprising: an elastic body that presses the rolling roller against the outer circumferential surface of the material to be rolled;
The device is characterized by being equipped with an automatic feeding device equipped with a stopper that regulates the amount of feed movement of the rolling roller by the elastic body. Not only can work efficiency be improved by automating movement, but it also eliminates the need for a special power source or power transmission mechanism, which is the case when automating the feeding and movement of rolling rollers using hydraulic cylinders or gear mechanisms. It is very simple, and the stopper regulates the amount of feed movement of the rolling roller due to elastic force.
The depth of the groove of the screw to be rolled on the outer circumferential surface of the material to be rolled can be specified, and after the thread is formed, the rolling roller does not press the outer surface of the material to be rolled any further. Even if the material to be rolled has a hollow shape, there is no risk of unexpected deformation after thread rolling, and thread accuracy is improved.

In this way, the present invention has made it possible to improve workability and screw precision by simply adding a very simple structure.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Reference numeral 1 denotes a head in which three rolling rollers 2, 2A, . . . having the same diameter are arranged in an annular manner.

Among the rolling rollers 2, 2A, one of the rolling rollers 2, 2A, etc. is used to roll a metal round bar, pipe, etc., which is inserted inside the rolling rollers 2, 2A, etc. It is configured to be able to feed and move in the radial direction with respect to the axis of the section a,
It is attached to the head 1 via an automatic feeder A, which will be described later.

It is pivotally supported in a fixed position relative to the other two rolling rollers 2A--&''L head 1 at the final forming position.

The head 1 has an elongated hole 3 that is perpendicular to the axis of the rolled material a formed in a part of the head 1 and is long in the horizontal direction, and has a g in the longitudinal direction of the elongated hole 3. 4, and a concave groove T on the side of the main frame 5 in which the pin 6 inserted and fixed to the main body frame 5 while passing through the elongated hole 3 and the protruding part 4 are slidably fitted. It is supported by the main body frame 5 via the main body frame 5 so as to be freely movable within the range of the elongated hole 3.

The body frame 5 includes a chuck that fixedly supports a part of the material to be rolled a inserted into the group of rolling rollers 2, 2A, etc., and a device (none of which is shown) that rotationally drives the chuck.

) are connected in series, but the main body frame 5 may be configured to be detachably fixed to a part of a lathe etc. as an attachment. The automatic feeding device A is configured as follows.

That is, 8 is a movable piece that pivotally supports the rolling roller 2, and is fitted into the head 10 rectangular cylindrical portion 1a so as to be slidable only in the feeding direction.

Reference numeral 9 denotes a feeding device main body which is fitted onto the rectangular tube portion 1a and fixed with bolts, and a screw shaft 10 having a right-handed thread is screwed onto the side wall portion 9a of the feeding device main body.

A handle 11 is attached to the outer end of the screw shaft 10, and a bolt 12 is concentrically threaded onto the inner end via a left-hand thread.

The head 12a side of this bolt 12 has a bush 13 screwed into a through hole formed in the center of the movable piece 8 via a left-hand thread.
penetrates through.

The bolt 12 is provided between the movable piece 8 and the screw shaft 10.
A coil spring 14, which is an example of the elastic body, and a thrust ball bearing 15 are interposed, and the elastic force of the coil spring 140 causes the movable piece 8 to move.
It is constructed so that it can be suppressed and moved.

The bolt head 12a and a bush 130 opposing the bolt head 12a
A plurality of steel balls 16 constituting a thrust ball bearing are interposed between the annular step portion 13a and the bolt head 1.
2a is configured to function as a stopper that limits the amount of movement of the movable piece 8 by the coil spring 14.

17 is a lock nut for adjusting the screwing position of the bolt 12 with respect to the screw shaft 10; 18 is an adjustment window; and 19 is a pressure adjustment lock nut screwed onto the screw shaft 10.

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

First, as shown in FIG. 3A, by rotating the bundle 11, the movable piece 8 is pulled out through the screw shaft 10 and the bolt 12, and the material to be rolled a is moved to the rolling roller 2.
, 2A... is inserted into the inner side of the group, and the axial position of the part to be threaded is set correctly, and a part of the formed material to be rolled a is fixedly supported by the chuck.

Next, as shown in the opening of FIG. 3, the bundle 11 is rotated in the tightening direction to artificially feed and move the rolling roller 2 to a position where it contacts the outer circumferential surface of the material to be rolled a.

In this case, since the head 1 can freely move within the range of the elongated hole 3, the head 1 moves freely, all the rolling rollers 2, 2A, . . . come into contact with three locations on the outer peripheral surface of the material to be rolled a.

In this state, the bolt head 12a, the steel ball 16, and the annular stepped portion 13a are in contact with each other.

Therefore, the elastic force of the coil spring 14 does not act as a feeding force for the rolling roller 2, but is maintained as an internal stress of the bolt 12, or is in a free state where the coil spring 14 is fully extended. It has become.

This is appropriately set by adjusting the screwing position of the bolt 12 with respect to the screw shaft 10.

Furthermore, when the bundle 11 is rotated, the rolling roller 2
is in contact with the outer circumferential surface of the material to be rolled a and does not move forward any further, so as shown in FIG. At the same time, the bolt head 12a and the annular stepped portion 13a are spaced apart from each other, creating an appropriate flexibility gap l.

This gap l is set to be equal to the depth of the thread groove to be rolled in the material to be rolled a by adjusting the distance by which the screw shaft 10 is advanced.

In this state, the elastic force of the coil spring 14 acts as a force that presses the rolling roller 2 against the outer peripheral surface of the material to be rolled a, that is, as a feeding force of the rolling roller 2.

In addition, in this state, the lock nut 19... is attached to the side wall portion 9a.
It comes into contact with the outer surface and prevents the screw shaft 10 from advancing any further.

Therefore, by changing the screwing position of the lock nut 19 with respect to the screw shaft 10 and the screwing position of the bolt 12 with respect to the screw shaft 10, the above-mentioned pressing force can be adjusted to an arbitrary magnitude.

After that, when the material to be rolled a is forcibly rotated around its axis, as the rolling rollers 2, 2A, etc. rotate relative to each other and the rolling roller 2 is fed, the shape shown in FIG. As shown in Figure 2, a thread b is rolled on the outer peripheral 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 constant, and the axial position of the material to be rolled a remains unchanged, so the material to be rolled is a As the thread is formed on the outer peripheral surface, the head 1 automatically moves within the range of the long hole 3 from the solid line position to the imaginary line position in FIG. Rolled material a
The automatic alignment function between the

When the rolling of the screw b is completed, as shown in FIG.
3 functions as a stopper for regulating the amount of feed movement of the rolling roller 2.

Therefore, the depth of the thread b is regulated, and the pressing of the rolling roller 2 after forming the thread b does not cause the risk of deforming the rolled material a due to force (thus, the thread accuracy can be improved). .

Furthermore, until the rolling roller 2 comes into contact with the outer circumferential surface of the material to be rolled a, it is manually fed and moved by operating the bundle 11, and then automatically fed by the coil spring 14. Irrespective of the diameter of the rolled material, proper pressing will yield a force.

In addition, when the rolling rollers 2, 2A, etc. are rollers having a male thread with a lead angle equal to the effective diameter lead angle of the desired rolling screw, as in the illustrated embodiment, each roller 2, 2A, etc.
A mark indicating the phase of each roller 2, 2A, etc. is attached to the end face of , and when all the rollers 2, 2A, etc. are in contact with the outer peripheral surface of the rolled material a, Adjust the phase of each roller 2, 2A, etc. by looking at this mark, or interlock the rotation of all rollers 2, 2A, etc. with an endless chain, etc. so that the phases of the rollers do not shift. It is necessary to take care that a series of threads are rolled by the male threads of each roller 2.2A, etc., by suitable means. 2, 2A, etc. are arranged at an angle so that each ring-shaped convex portion has a helix angle equal to the effective diameter lead angle of the desired rolled screw, such consideration is not necessary. be.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the thread rolling machine according to the present invention,
1 is a partially cutaway front view, FIG. 2 is a partially cutaway plan view, FIGS. 3A to 3B are sectional views of the main parts showing the functions of the main parts, and FIG. 4 is an operational view. DESCRIPTION OF SYMBOLS 1... Head, 2, 2A... Rolling roller, a... Rolled material, 14... Elastic body, 13a... ...Stopper, A...
Automatic feeding device.

Claims (1)

[Claims] 1 Multiple rolling rollers 2゜2A mounted on the head 1
At least one of the rolling rollers 2 is inserted into the group of rolling rollers 2, 2A, and can be moved in the radial direction or in the radial direction with respect to the axis of the rolled material a. In addition, the remaining forming rollers 2A and
are fixed at the final forming position when the desired thread has been rolled on the material to be rolled a, and the center of the group of rolling rollers 2, 2A and the material to be rolled are The head 1 is configured to be movable relative to the rolled material a in order to align the axes of the rolled material a, and the relative rotation between the rolling rollers 2, 2A, etc. and the rolled material a, A thread rolling machine configured to roll a thread on the outer circumferential surface of a material to be rolled a, an elastic body 14 that presses the rolling roller 2 against the outer peripheral surface of the material to be rolled a; A thread rolling machine characterized in that it is provided with an automatic feed device A equipped with a stopper 12a for regulating the amount of feed movement of the rolling roller 2 by the elastic body 14.