JPH0475097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a seamless ring having a diameter larger than the cross section of the ring, and involves rolling or rotating a cylindrical material cut to an appropriate length. This invention relates to manufacturing rings by simultaneously forming a plurality of rings into a bellows shape by rolling, and then dividing the bellows shape ring into a plurality of rings by punching.

BACKGROUND ART As shown in FIG. 5, a pipe material is rotary rolled or rolled into a bellows shape having a plurality of annular ring parts 2 having a desired cross section and a thin annular piece 4 between each ring part. Japanese Patent Publication No. 59-18141 discloses a prior art technique in which the pipe material 1 is divided into a plurality of rings by forming and then cutting and removing the thin annular piece 4.

Problems to be Solved by the Invention When the bellows-shaped pipe material 1 is formed by rotary rolling or rolling, the inner and outer circumferences of the ring portion 2 have poor roundness and become elliptical. Therefore, the thin annular piece 4 that connects each ring portion 2 was cut and removed, and the inner and outer peripheries of the single ring were largely shaved off to obtain the desired ring.

Furthermore, since it is difficult to obtain a flat surface on the axial side surface of a single ring, it was molded with a considerable cutting allowance on the side surface as well as the inner and outer peripheries, and then finished by cutting off this allowance after molding.

Therefore, although the conventional processing method can completely eliminate the cut-off process for ring formation, it has the disadvantage that it requires a large amount of lace processing after dividing into individual rings and has a poor material yield.

Means for Solving the Problems A pipe material is rotary rolled or rolled into a bellows shape having a plurality of annular ring parts having a desired cross section and a thin annular piece between each ring part, and at least the above-mentioned. Most of the thin annular piece is formed so as to protrude in the radial direction from the ring portion, and then the annular piece is pushed into a straightening die to straighten the inner and outer peripheries, and while the straightening die is pushed in, the annular piece The bellows-shaped pipe material is divided into a plurality of rings by punching, and a plurality of rings with a desired cross section are simultaneously manufactured integrally.

Function A thin annular piece connecting each ring portion is punched out, and the ring portion is divided into individual rings, and the ellipses of the inner and outer circumferences of each individual ring are corrected.

In addition, when punching, if the tip end face of the punch is directly pressed against the side surface in the axial direction of the ring, so that the side surfaces of each single ring are brought into strong contact with each other, the accuracy of the flat surface of the side surface in the axial direction of the ring can be improved.

Example Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a bellows-shaped pipe material, and a plurality of annular ring parts 2 having a desired cross section.
and a thin annular piece 4 between each ring portion 2.

This pipe material 1 has an annular groove portion 3 between adjacent ring portions 4, and a groove bottom 5 of the annular groove portion protrudes radially inward from the inner circumferential surface of the ring portion 4. That is, the thin annular piece 4 forming the groove bottom 5
, most of which protrude from the ring portion 2 in the radial direction.

The pipe material 1 is formed by appropriately heating a material such as a steel pipe that has been cut into predetermined dimensions, and then rotary rolling or rolling.

Next, the process of dividing the bellows-shaped pipe material 1 into a plurality of single rings 4a will be described in detail.

FIG. 1 shows the main parts of a mold part of a horizontal press machine, in which 10 is a straightening die, 15 is a counter punch, 20 is a punch, and 25 is a knockout.

The straightening die 10 has a cylindrical wall surface 12 having an inner diameter equivalent to the desired ring outer diameter on its inner periphery, and a tapered wall surface 11 whose diameter increases from the cylindrical wall surface 12 toward one end to facilitate the entry of the pipe material 1.

A guide jig 13 for positioning the pipe material 1 with respect to the inner periphery of the straightening die 10 is disposed on the large-diameter end surface of the tapered wall surface 11.

The counter punch 15 includes a blade 17 for punching the annular piece 4 on the surface facing the punch 20, and a punch 2.
0 and the counter punch 15 are aligned with each other.

The blade 17 of this counter punch 15 and the blade 17
The outer diameter of the cylindrical portion subsequent to is formed to be equal to the inner diameter of the desired single ring.

Ring knockout 18 is counter punch 1
5 and the cylindrical wall surface 12 of the straightening die, and is movable forward and backward by a hydraulic cylinder (not shown).

The shaft end surface 19 of the ring knockout 18 facing the punch 20 is finished into a flat surface in order to forcefully press the separated single ring between it and the tip end surface 24 of the punch 20.

The outer diameter of the punch 20 is formed to be slightly smaller than the inner diameter of the straightening die cylindrical wall surface 12, and the guide hole on the inner circumference is formed so as to be able to fit into the guide column portion 16 of the counter punch 15 without any play. 23
is an air vent hole.

Further, on the inner circumferential side of the tip surface 24 of the punch 20, an annular escape groove 2 is formed to accommodate the punched annular piece 4.
1 is provided.

Knockout 25 arranged in this relief groove 21
is normally located at the bottom of the relief groove 21 together with the knockout bar 26 due to the force of the spring 27, and is moved in the direction toward the counter punch by the advancement of the knockout plate 28 connected to the knockout pin 29. There is.

To explain how to divide the pipe material 1 in the structure described above, first, the pipe material 1 previously formed into a bellows shape is placed on the guide jig 13 as shown in FIG.

Subsequently, the punch 20 is introduced into the inner periphery of the straightening die 10.

As a result, the annular piece 4 of the pipe material 1 is punched out by the blade 17 of the counter punch, as shown in FIG. 2, and each ring portion 2 is separated.

At this time, the ring portion 2 becomes an independent single ring 2a, and the roundness of its inner and outer circumferences is corrected between the straightening die cylindrical wall surface 12 and the counter punch outer circumference, and the flatness of the end surface in the axial direction is also corrected. The ring knockout shaft end face 19 and the punch tip face 24 are strongly pressed and corrected.

Further, the annular piece 4 becomes a scrap 4a and is accommodated in the relief groove 21 of the punch.

Further, as shown in FIG.
0 is advanced, and the counter punch 15 and ring knockout 18 are integrally retracted. During this retreat, back pressure is applied to the ring knockout 18 so that each ring 2a is squeezed against the cylindrical wall surface 12 of the straightening die under strong pressure.
Increase the correction effect of a.

After that, in order to knock out the ring 2a and the scrap 4a, punch 2 is used as shown in FIG.
Retract 0.

In this state, the ring knockout 18 is advanced to knock out the ring 2a, and the knockout pin 29 is advanced to eject the scrap 4a.

Note that the present invention is not limited to the above-mentioned embodiments, but the ring portion 2 of the bellows-shaped pipe material 1 is formed with rough teeth of a gear, and on the other hand, the straightening die 10 has a straightening gear on its inner periphery. A tooth pattern may be formed, and when the pipe material 1 is punched, the rings may be divided and the gears may be sized at the same time.

As described above, the ring manufactured according to the present invention is particularly effective as a ring material for making various ring gears.

Effects As described above, according to the present invention, a thin annular piece connecting each ring portion is punched out, and the ring is divided into individual rings, and
The ellipses on the inner and outer peripheries of each single ring are corrected, and the roundness of the inner and outer peripheries of the single ring is increased when the separation is completed, so the cutting allowance expected for the single ring when the separation is completed can be significantly reduced, and the The amount of lace processing on a single ring can be minimized. Therefore, the ring dividing work and the subsequent lace processing of the single ring can be made highly efficient.

[Brief explanation of the drawing]

1 to 4 represent an embodiment of the present invention, and are sectional views showing the main parts of a mold part of a horizontal press machine. FIG. 5 is a cross-sectional plan view of a conventional bellows-shaped pipe material. (Explanation of symbols), 1... Pipe material. 2...Ring part. 4...Annular piece. 4a... (single) ring. 10...Correction dice.

Claims (1)

[Claims] 1 The pipe material 1 is rotary rolled or rolled,
The bellows shape has a plurality of annular ring parts 2 having a required cross section and a thin annular piece 4 between each ring part 2, and at least a large part of the thin annular piece 4 is made larger than the ring part 2. The annular piece 4 is formed to protrude in the radial direction, and then the annular piece 4 is inserted into a straightening die 10.
The inner and outer circumferences of the pipe material 1 are corrected, and the annular piece 4 is punched out while the correction die is pressed in, thereby forming the bellows-shaped pipe material 1 into a plurality of rings 4a.
A method for manufacturing a ring, characterized by dividing the ring into two parts and simultaneously manufacturing a plurality of rings with a desired cross section in an integrated manner.