JP4034788B2 - Squeezing roller - Google Patents

Description

  The present invention relates to a squeeze roller that performs a drawing process on an outer peripheral surface of a cylindrical material, and particularly relates to a squeeze roller that can be used for manufacturing a tapered steel pipe and can improve the roller life.

FIG. 4 shows an outline of a tapered steel pipe processing machine that manufactures a long steel pipe (pipe) into a tapered steel pipe among conventional apparatuses using squeezing rollers.
A taper steel pipe processing machine 1 used for manufacturing this taper steel pipe is a machine for plastically processing a long pipe material W into a taper steel pipe in a heated atmosphere, and a tension-side rotating mechanism base 2 placed on a frame 4; The drive side rotation mechanism base 3 placed on the frame 5, the drawing device S and the heating device H disposed between the frames 4 and 5, the tension side rotation mechanism table 2 and the drive side rotation mechanism. The table 3 is provided with driving means 2a and 3a, respectively, so that the frame 4 and 5 can be shifted in the axial direction. The configuration of the drive means 2a, 3a is not particularly limited, but the tension-side rotating mechanism base is configured by meshing a pinion that is rotated by a servo motor, a hydraulic motor, or the like with racks laid on both the frames 4, 5 2. It is preferable that the drive side rotating mechanism base 3 is configured to be shifted.

  The drive side rotation mechanism base 3 is provided with shaft rotation means 3b to drive the pipe material W to rotate. The tension-side rotation mechanism base 2 may be provided with a rotation means by a synchronous drive control mechanism (not shown), but it is preferable that the tension-side rotation mechanism base 2 is rotatably supported by a bearing or the like and is simply driven.

  In the method of manufacturing a tapered steel pipe using the tapered steel pipe processing machine 1 having the above-described configuration, first, the pipe forming end side of the pipe material W is gripped by the loader mechanism (not shown) or the gripping device 7 of the driving side rotating mechanism base 3 by hand. Attach to. Then, when the driving side rotating mechanism base 3 is moved to the tension side rotating mechanism base 2 by the driving means 3a and the pipe forming start end side of the pipe material W is gripped on the tension side rotating mechanism base 2 side, the driving side rotating mechanism base 3 is The driving means 3a is stopped, the pipe material W is rotated at a high speed by the shaft rotating means 3b, and a tensile force is applied to the left side of the drawing by the driving means 2a of the tension side rotating mechanism base 2 so that the steel pipes are sequentially transferred and drawn. The drawing roller R of the processing device S is brought into contact with the peripheral surface of the pipe material W to start contraction (drawing).

By moving the tension side rotation mechanism base 2 by the driving means 2a, a tensile force can be applied to the pipe material W processed by the squeezing roller R when the pipe material W is sequentially transferred. According to the experiments by the present inventors, the tensile force in the direction A (see FIG. 4B) by the driving means 2a is about 20 t at both ends of the pipe material, and the holding force (the tensile force in the B direction (see FIG. 4B) by the driving means 3a). 4 (b))))) is added for about 5t, and when a long steel pipe (pipe) is plastically worked into a tapered steel pipe in a heated atmosphere, good plastic working can be performed in one operation. It can be carried out.
Needless to say, the tensile force and the holding force change in accordance with changes in pipe size, wall thickness, and the like.

  The gripping device 7 disposed at the tip of the drive side rotation mechanism base 3 passes through the heating device H, and is drawn to the vicinity of the gripping device 7 of the pipe material W gripped by the gripping device 7 by the roller R of the drawing processing device S. When the process is performed, the drawing process is completed (see FIG. 4B), and a tapered steel pipe is manufactured (see, for example, Patent Document 1).

  However, the drawing roller R used for drawing by the tapered steel pipe processing machine 1 is such that the abutting portion of the roller 20 that abuts on the material rotates at both ends to the bracket 14 by bearings 15 and 15 as shown in FIG. It is an integral part fixed to the main shaft 13 that is freely attached, and as the drawing of the material proceeds, a peripheral speed difference occurs between the a part (molding roller part) and the b part (pressure roller part), and the b part is the a part. There was a problem that it was worn out earlier.

Further, a squeeze roller is also employed in which the forming roller portion and the pressure roller portion are rotatably mounted in parallel by separate bearings with respect to the main shaft (see, for example, Patent Document 2).
However, in the case of mounting in parallel, it is necessary to support each roller independently, and it is necessary to use a bearing that can withstand a large load, which increases costs and increases the installation space of the roller. was there.
JP 2002-292433 A Japanese Patent Publication No.46-11568

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the conventional squeeze rollers, and it is an object of the present invention to provide a squeeze roller that does not require expensive bearings and has a long life and does not require replacement.

To achieve the above object, the present squeezing rollers of the first invention is a squeeze roller applying drawing the material outer periphery of the cylindrical main shaft which is disposed rotatably on the bracket, after fixed to the main shaft working a first roller positioned on the process side, Ri Do and a second roller located rotatably first front faster than the circumferential speed roller machining process side which is disposed on the main shaft, the first roller and the second rollers are characterized by a forms a convex peripheral surface continuous Rukoto.

According to a second aspect of the present invention, there is provided a drawing roller that performs drawing on an outer periphery of a cylindrical material, and a first main shaft that is fixed to the bracket and that is disposed on the main processing shaft so as to be rotatable. roller and, Ri Do and a second roller positioned on the first front faster than the circumferential speed roller machining process side which is disposed rotatably on the first roller, a convex first roller and the second roller is a continuous forming a Jo of the peripheral surface, characterized in Rukoto such by.

  In this case, the second roller can be divided into a plurality of parts.

According to the squeezing roller of the first aspect of the invention, a main shaft that is rotatably disposed on the bracket, a first roller that is fixed to the main shaft and is positioned on the post-processing step side, and is rotatably disposed on the main shaft. Ri Do and a second roller positioned fast before machining process side of the peripheral speed than the first roller, the first roller and the second roller from the by forming a convex circumferential surface which is continuous, the first roller And the second roller can be rotated separately. Therefore, only the second roller portion where the peripheral speed is increased is not worn first, and the bearing supporting the second roller only needs to be able to withstand the rotational speed of the difference in peripheral speed with the first roller. In addition, it is possible to provide a squeeze roller that can use an inexpensive bearing and can replace only the second roller portion.

Further, like the squeezing roller of the second invention, a main shaft fixed to the bracket, a first roller disposed on the main shaft so as to be rotatable, and a post-processing step side, and a rotatable on the first roller. Ri Do and a second roller positioned on the first roller from the peripheral speed fast before process step side which is arranged, the first roller and the second roller is also when obtained by forming a convex peripheral surface which is continuous The effect of can be produced.

  Further, when the second roller is divided into a plurality of parts, it is possible to cope with small differences in peripheral speed.

  Embodiments of a squeeze roller according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the squeezing roller of the present invention is used in a tapered steel pipe processing machine for manufacturing a tapered steel pipe similar to the conventional example.
The squeezing roller 10 includes a first roller 11 fixed to a main shaft 13 rotatably disposed on a bracket 14 and a second roller 12 rotatably attached to the main shaft 13. The main shaft 13 includes a large-diameter portion 13a at the center portion, a middle-diameter portion 13b at the second roller 12 side end portion serving as a pressure roller, and a small-diameter portion 13c at the first roller side end portion serving as a forming roller. A medium diameter portion 13b and a small diameter portion 13c are rotatably attached to the brackets 14a and 14b via bearings 15a and 15b, respectively. The outer diameters of the medium diameter portion 13b and the small diameter portion 13c are not particularly limited as long as they can withstand the load during the drawing process. The end (13c) may have a larger diameter than the opposite side (13b).
Further, if the first roller 11 is fixed, the main shaft 13 may not be a stepped shaft but may have a constant diameter.

The first roller 11 is fixed to a step portion between the large diameter portion 13a and the small diameter portion 13c of the main shaft 13 with a fixing member such as a bolt as shown in the figure, and is integrally formed with the main shaft 13 by cutting or the like. Also good.
The second roller 12 is rotatably attached to the large-diameter portion 13a of the main shaft 13 via a bearing 16 for the second roller. The second roller 12 is divided and formed into a roller peripheral portion 12a that comes into contact with the material W and a roller boss portion 12b that fits into the bearing 16, and the roller peripheral portion 12a is fixed to the roller boss portion 12b by fixing means such as a bolt. Moreover, you may comprise the roller peripheral part 12a and the roller boss | hub part 12b integrally. In the case where the roller peripheral portion 12a and the roller boss portion 12b are divided and configured, only the roller peripheral portion 12a can be replaced, and the maintenance cost can be further reduced.
A minute gap M (see FIG. 1B) is provided between the side surfaces of both the rollers 11 and 12, and the peripheral portion of the first roller 11 and the peripheral portion 12a of the second roller 12 are continuous protrusions. A circumferential surface is formed.
Then, as shown in FIG. 1B (enlarged view of portion X in FIG. 1A), the matching corners of both rollers 11 and 12 are chamfered (11r, 12ar), and the second roller 12 The roller peripheral portion 12 a is slightly protruded from the peripheral portion of the first roller 11 by L (about 1 mm) to prevent the scale from being caught between the rollers 11 and 12.

  Since the squeezing roller 10 has the above-described configuration, as the drawing process of the material proceeds, even if a difference in circumferential speed occurs on the roller surface in contact with the material, the circumferential speed of the second roller 12 increases. Since the portion 12a is rotatably attached to the main shaft 13 that rotates integrally with the first roller 11 via a bearing 16, it can rotate more than the first roller 11 by a difference in peripheral speed. Yes, it is possible to effectively prevent early wear due to a difference in peripheral speed.

  Next, a second embodiment of the squeeze roller of the present invention shown in FIG. 2 will be described. This squeezing roller 10 shows an example in which the second roller 12 is divided into a plurality of pieces (in the example shown, three second rollers 12c, second rollers 12d, and second rollers 12e) in a ring shape. The second rollers 12c, 12d, and 12e are rotatably disposed on the main shaft 13 via bearings 16a, 16b, and 16c.

Since the second roller 12 is divided into a plurality of pieces in a ring shape, the contact area between the second roller 12 and the material increases as the drawing process proceeds as in the drawing process of the tapered steel pipe. When the peripheral speed difference with the roller 11 gradually increases, the speed difference can be effectively absorbed.
SB is a thrust ball bearing inserted into a circumferential groove formed between the roller side surfaces.

  Next, a third embodiment of the squeeze roller of the present invention shown in FIG. 3 will be described. The squeezing roller 10 includes a main shaft 13 fixed to a bracket (not shown), a first roller 11 rotatably disposed on the main shaft 13 via a bearing 15, and a bearing 16 on the first roller 11. It consists of the 2nd roller 12 arrange | positioned rotatably.

  Like the second embodiment, the second roller 12 is divided into three second rollers 12c, a second roller 12d, and a second roller 12e in a ring shape in the figure, and the bearings 16a, 16b, and 16c are respectively divided. An example is shown in which the first roller 11 is pivotably disposed via the first roller 11, but may be non-divided as in the first embodiment.

  As the drawing of the material progresses, each portion of the second roller 12 whose peripheral speed is increased is supported by the main shaft 13 by the bearing 15 and rotates even if a difference in peripheral speed occurs on the roller surface in contact with the material. Since the first roller 11 is rotatably attached to the first roller 11 via a bearing 16, it rotates more than the first roller 11 by the difference in peripheral speed, and the same effect as in the first and second embodiments. And the main shaft 13 only needs to be fixed to the bracket, and the configuration can be simplified.

  Further, as shown in FIG. 3B, predetermined side corners 11r and 12r of the first roller 11 and the second roller 12 and the side corners of the second rollers 12 in the divided configuration are predetermined. It is preferable to form a chamfer with a radius r. As a result, it is possible to effectively prevent problems such as biting the scale during processing and scratching the material.

  As described above, the squeezing roller of the present invention has been described based on a plurality of embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configuration is appropriately changed without departing from the spirit thereof. Is something that can be done.

  As described above, the squeezing roller of the present invention has a characteristic that abnormal wear due to a difference in peripheral speed of the roller surface can be reduced by dividing the squeezing roller into a first roller and a second roller. Therefore, it can be used in a spinning machine used for manufacturing a tapered steel pipe with a new facility, and can also be used, for example, by replacing the squeeze roller in an existing spinning machine.

1 shows a first embodiment of a squeeze roller according to the present invention, in which (a) is a front view of a partial cross section and (b) is a detailed view of an X portion of (a). It is a front view of the partial cross section of 2nd Example of the aperture_diaphragm | restriction roller of this invention. The 3rd Example of the aperture_diaphragm | restriction roller of this invention is shown, (a) is the front view of a partial cross section, (b) is a detailed drawing of a matching side corner | angular part. It is the schematic of the manufacturing method of a taper steel pipe. It is a front view of the partial cross section of the conventional squeeze roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Diaphragm roller 11 1st roller 12 2nd roller 12a Roller peripheral part 12b Roller boss part 12c 2nd roller 12d 2nd roller 12e 2nd roller 13 Main shaft

Claims (3)

A squeezing roller that performs drawing on the outer periphery of a cylindrical material, a main shaft that is rotatably disposed on a bracket, a first roller that is fixed to the main shaft and located on a post-processing step side, and is rotatable on the main shaft Ri Do from than first roller which is arranged a second roller positioned circumferentially fast velocity before the processing step side, the a first roller and second roller to form a convex peripheral surface continuous Rukoto A squeezing roller characterized by In a drawing roller for drawing an outer periphery of a cylindrical material, a main shaft fixed to a bracket, a first roller that is rotatably disposed on the main shaft and located on a post-processing step side, and is rotated around the first roller. Ri Do and a second roller which is located movably in the first front faster than the circumferential speed roller machining process side which is disposed, the first roller and the second roller is I forms a convex circumferential surface which is continuous A squeeze roller characterized by that.   The squeezing roller according to claim 1 or 2, wherein the second roller is divided into a plurality of parts.

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