JP2002239606A - Method and device for rolling by ring rolling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of defects in shape such as dents on a ring- like material to be rolled in a rolling device by ring-rolling in the system of which reduction is performed in the height direction with an edger. SOLUTION: By arranging ring-like members 6a, 6b whose rotations are respectively synchronizing with a mandrel 3 and which are freely slidable in the axial direction to the mandrel 3 on both side parts of the part for reducing a material to be rolled of the mandrel 3, when performing thickness reduction with the mandrel 3, the height reduction is performed with each ring-like members 6a, 6b interlocking with the rolling of the top and bottom surfaces of the material 1 to be rolled with the edger rolls 4, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for performing ring rolling rolling so that a ring-shaped material to be rolled has a target outer diameter, inner diameter, and height.

[0002]

2. Description of the Related Art FIG. 5 schematically shows an example of a conventional ring rolling mill (hereinafter referred to as a first conventional example), in which (a) is a side view including a partial sectional view, and (b). Is a plan view thereof. FIG. 4 is an explanatory view of a deformed shape of a ring-shaped material to be roll-formed by the first conventional apparatus.

In FIG. 5, 1 is a ring-shaped material to be rolled (hereinafter simply referred to as a material to be rolled), 2 is a main roll, 3 is a mandrel, 4 is an edger roll (hereinafter simply referred to as an edger), and 5 is a tracer. is there.

In the ring rolling rolling, while the diameter of the material 1 to be rolled is detected by the tracer 5, the material 1
Is thickened in the radial direction by the main roll 2 and the mandrel 3, and height-rolled in the axial direction by the upper and lower conical edgers 4 and 4.

The main roll 2 is fixed, and has a function of rotating the material to be rolled 1 at a constant peripheral speed while rotating at a constant speed. The mandrel 3 is disposed on the inner diameter side of the material to be rolled 1 by the following, sandwiches the material to be rolled 1 together with the main roll 2, moves in the direction of the main roll, and performs reduction in the thickness direction.

In the edgers 4, 4, one or both of the conical rolls are generally arranged vertically at positions 180 ° different from the main roll 2, and usually, the upper roll moves downward to be rolled. The material 1 is reduced in the height direction. The reason why the edgers 4 and 4 have a conical shape is that the peripheral speed of the material 1 to be rolled is different between the inner peripheral side and the outer peripheral side (inner peripheral side <outer peripheral side).
This is because it is necessary to absorb the peripheral speed difference. Therefore, the edgers 4, 4 are arranged so that the tip of the conical roll coincides with the center of the material 1 to be rolled. It moves in the direction (larger diameter side).

As another example of a conventional ring rolling mill, there is a radial rotary ring forming machine disclosed in Japanese Patent Application Laid-Open No. Hei 7-275991 (hereinafter referred to as a second conventional example). The apparatus of the second conventional example is used for forming a rolled material having irregularities in the cross-sectional shape.
A caliber main roll having a brim portion and a caliber mandrel also having a brim portion are used.

[0008] That is, the apparatus of the second conventional example has the purpose of preventing underfilling only at the collar portion without using an edger, and the collar portion is integrally provided on the upper surface of the mandrel. During molding, the collar does not move up and down, and the position is fixed.

[0009]

However, in the methods described in the first and second prior arts, the method of setting the initial shape for the final shape of the material to be rolled and the method for changing from the initial shape to the final shape are all used. It has not been verified what kind of route and how much time to reduce.

According to the experiment of the present inventor, in the case of the above-mentioned first conventional example, even if the control of the edgers 4 and 4 is normal,
Depending on how to set the initial shape with respect to the final shape of the material 1 to be rolled, and on what path and for how long the rolling is performed from the initial shape to the final shape, the shape of the material to be rolled 1 is inferior and severe. In this case, it has been found that dents 1a and 1b in the upper and lower surfaces (indentations in the height direction) and dents 1c and 1d in both sides (thickness in the thickness direction) as shown in FIG.

That is, rolling is started after the mandrel 3 is inserted into the material 1 to be rolled. Therefore, the mandrel 3 is compared with the main roll 2 so that rolling can be performed even when the initial shape (inner diameter shape) of the material 1 to be rolled is small.
Is set small. Therefore, the material to be rolled 1
The contact arc length with the mandrel 3 becomes smaller on the mandrel 3 side, and the bite on the mandrel 3 side with the main roll 2 becomes larger,
As shown in FIG. 6, as shown in FIG. 6, the rolled material 1 has depressions 1 a and 1 b asymmetrically in the thickness direction in which the mandrel 3 side is greatly deformed.

Further, in the case of the second conventional example described above, an edger is not used, and a flange provided integrally on the upper surface of the mandrel prevents a part of the material to be rolled from escaping in the vertical direction. When the material spreads in the height direction to the collar portion during the thickness rolling of the main roll and the mandrel, the material contacts the collar portion for the first time and the height is limited. In other words, in the second conventional example, the height is not limited as long as the height of the material to be rolled does not grow to the height that comes into contact with the collar portion. For this reason, it cannot be applied to a ring rolling mill of a system in which the height of the material to be rolled is continuously compressed by the reduction in the height direction by the edger as in the first conventional example described above.

[0013] A technical problem of the present invention is to reduce the occurrence of shape defects such as dents in a ring-shaped material to be rolled in a ring rolling mill of a type in which a height is reduced by an edger. Is to do.

[0014]

According to a first aspect of the present invention, there is provided a ring rolling method, wherein the outer diameter of a ring-shaped material to be rolled is detected by a tracer and the thickness reduction in the radial direction of the material to be rolled is reduced. A main roll and a mandrel to be performed, and a pair of upper and lower edger rolls for performing a height reduction in the axial direction of the material to be rolled, perform ring rolling rolling so that the material to be rolled has a target outer diameter, inner diameter, and height. In the method, on both sides sandwiching the rolled material pressure lower part of the mandrel, the rotation is synchronous with the mandrel, respectively, and a ring-shaped member that is slidable in the axial direction with respect to the mandrel is arranged, and when the thickness is reduced by the mandrel, The height reduction by each ring-shaped member is performed in conjunction with the upper and lower surface rolling of the material to be rolled by the edger.

Further, the apparatus according to claim 2 used in this method comprises a main roll and a mandrel for reducing the thickness of the material to be rolled in the radial direction while detecting the outer diameter of the material to be rolled by the tracer. A pair of upper and lower edger rolls for reducing the height of the material to be rolled in the axial direction, a device for performing ring rolling rolling so that the material to be rolled has the target outer diameter, inner diameter, and height; On both sides sandwiching the rolled material pressure lower part, the mandrel and the rotation are synchronized respectively, and a ring-shaped member slidable in the axial direction with respect to the mandrel is arranged, and in conjunction with the upper and lower surface rolling of the material to be rolled by the edger An interval adjusting mechanism for adjusting the interval between the ring-shaped members is provided.

In this apparatus, the gap adjusting mechanism sets the gap between the ring-shaped members within 0.1% or less of the height of the material to be rolled before the thickness reduction by the mandrel. It is controlled so as to increase.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ring rolling method according to an embodiment of the present invention and an apparatus used in the method will be described below with reference to FIGS. FIG. 1 schematically shows a ring rolling mill according to the present embodiment, in which (a) is a side view including a partial sectional view, and (b) is a plan view thereof. FIG. 2 is an explanatory view of a deformed shape of a ring-shaped material to be roll-formed by the apparatus of the present embodiment, and FIG. 3 shows details of a main part of the apparatus of the present embodiment. Enlarged side view, including cross-section display,
4B is a cross-sectional view taken along the line AA in FIG. 4A, and FIG. 4 shows the operation of the ring-shaped member of the present invention in comparison with the conventional method. Example) An explanatory diagram of the operation by the method, and (b) is an explanatory diagram of the operation by the present invention. In the respective drawings, the same parts as those of the above-mentioned first conventional example are denoted by the same reference numerals.

In the ring rolling mill of the present embodiment, the rotation of the mandrel 3 is synchronized with the rotation of the mandrel 3 on both sides of the mandrel 3 sandwiching the lower portion of the material to be rolled.
Ring members 6a, 6 slidable in the axial direction with respect to
b, and each of the ring-shaped members 6a, 6
This is provided with interval adjusting mechanisms 10, 10 for adjusting the interval between b.

This will be described in more detail. Since the upper and lower ring-shaped members 6a and 6b and the upper and lower gap adjusting mechanisms 10 and 10 have the same structure, the upper ring-shaped member 6 is shown in FIG. 6a and only the upper gap adjusting mechanism 10 are shown and described. In the mandrel 3 of the present embodiment, spline grooves 3a are formed on both sides of the rolled material pressing portion, and the spline grooves 3a are formed on the inner peripheral surface of the ring-shaped member 6a at the end opposite to the material to be rolled. The formed axial slider portion 6c is engaged, and the ring-shaped member 6a rotates integrally with the mandrel 3.

The gap adjusting mechanism 10 is fitted over the ring-shaped member 6a, via an outward flange 6d formed on the outer peripheral surface of the ring-shaped member 6a on the side opposite to the material to be rolled, and the first thrust bearing 11. It has a first ring body 12 having an L-shaped cross section which is rotatably engaged, and a step 14a into which an end of the first ring body 12 on the side opposite to the material to be rolled is fitted.
The first ring body 12 is fastened to the ring-shaped member 6 a through the second thrust bearing 13.
And a second ring member 14 that is rotatably contacted with the end surface on the side opposite to the material to be rolled, and an oil pressure is applied to the second ring member 14 in conjunction with upper and lower surface rolling of the material 1 to be rolled by the edgers 4. By applying, a ring-shaped member 6a integrated with each of the ring bodies 12 and 14 is moved forward and backward in the direction of the arrow (axial direction), and a hydraulic unit (not shown) for adjusting the interval between the ring-shaped members 6a and 6b. And each ring-shaped member 6a, 6b
Are controlled in conjunction with the edgers 4 and 4. Other configurations and operations are basically the same as those of the first conventional example.

In the ring rolling mill of the present embodiment, while the diameter of the material 1 to be rolled is detected by the tracer 5, the material 1 to be rolled is thickened in the radial direction by the main roll 2 and the mandrel 3, and Rolling in the axial direction by the conical edgers 4 and 4 of the mandrel 3
Ring-shaped members 6a, 6b in conjunction with the upper and lower surface rolling of the material 1 to be rolled by the edgers 4, 4 when the thickness is reduced by
To reduce the height.

As described above, the ring-shaped members 6a and 6b, which are spline-engaged with the mandrel 3, are disposed on both sides of the mandrel 3 sandwiching the material to be rolled. Each of the ring members 6a, 6a,
4A, the mandrel 3 side, which is conventionally generated as shown in FIG. 4 (a), is deformed greatly as shown in FIG.
It can be reduced as shown in FIG.

The results of forming by the ring rolling rolling method of the present invention are shown in Table 1 below in comparison with the results of forming by a conventional method without rolling down by a ring-shaped member.

[0024]

[Table 1]

In Table 1, the steel type used was S45C
The material before ring rolling has an outer diameter of 600 mm, an inner diameter of 300 mm, a height of 130 mm, and the final product has an outer diameter of 14 mm.
00 mm, inner diameter 1250 mm, height 88.3 mm. From 600mm to 1380mm outer diameter growth rate is 6mm / s
ec and the outer diameter is from 1380mm to 1400
Control the outer diameter growth rate to 2 mm / sec up to mm,
The position of the ring-shaped rolled material was controlled with respect to the outer diameter. From the initial height of 130 mm when the outer diameter is 560 mm to the outer diameter of 140
The height was linearly controlled with respect to the outer diameter up to a height of 88.3 mm at 0 mm.

The height data of the material to be rolled is obtained from the edger side, and the distance between the ring-shaped members 6a and 6b is set to 0.05 from the height of the material to be rolled before the thickness reduction by the mandrel.
% Automatically controlled to increase.

As is apparent from Table 1, when the thickness is reduced by the mandrel, the height is reduced by each ring-shaped member in conjunction with the upper and lower surface rolling of the material to be rolled by the edger, so that the molding is performed as compared with the conventional method. The dent amount of the product is reduced,
And the dimensional accuracy has been improved.

[0028]

As described above, according to the ring rolling rolling method of the first aspect of the present invention and the apparatus of the second aspect used in this method, it is possible to reduce the dent on the surface of the ring rolling molded product. And the dimensional accuracy could be improved. Therefore, the step of finishing the molded article can be omitted, and the yield and productivity of the product have been improved.

In the apparatus according to the second aspect, the interval between the ring-shaped members is set to be 0.1 mm or less from the height of the material to be rolled before the thickness reduction by the mandrel by the interval adjusting mechanism.
%, It was possible to easily suppress the asymmetrical dent in the thickness direction, in which the mandrel side is largely deformed, which conventionally occurred, within the allowable range.

[Brief description of the drawings]

FIG. 1 is a side view and a plan view schematically showing a ring rolling mill according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a deformed shape of a ring-shaped material to be roll-formed by the apparatus according to the embodiment.

FIG. 3 is an enlarged side view including a partial sectional view showing details of a main part of the apparatus of the embodiment.

FIG. 4 is an explanatory diagram showing the operation of the apparatus according to the present embodiment in comparison with a conventional system.

FIG. 5 is a side view and a plan view schematically showing a ring rolling mill of a first conventional example.

FIG. 6 is an explanatory diagram of a deformed shape of a ring-shaped material to be roll-formed by ring rolling using the apparatus of the first conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring-shaped rolling material 1a, 1b Depression in height direction 1c, 1d Depression in thickness direction 2 Main roll 3 Mandrel 4 Edger roll 5 Tracer 6a, 6b Ring-shaped member 10 Interval adjustment mechanism

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadaka Masuda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Takeshi Yamada 4-6 Kojimacho, Kawasaki-ku, Kawasaki-shi, Kawasaki, Kanagawa Prefecture Inside NUK Metalworking Co., Ltd. (72) Inventor Shoichi Ando 4-6 Kojimacho, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture

Claims (3)

[Claims] 1. A main roll and a mandrel for reducing the thickness of a material to be rolled in a radial direction while detecting an outer diameter of the material to be rolled by a tracer, and an axial height of the material to be rolled. By a pair of upper and lower edger rolls that perform rolling, in a method of performing ring rolling rolling so that the material to be rolled has a target outer diameter, inner diameter, and height, both sides of the mandrel sandwiching a material rolling portion to be rolled. In addition, the rotation is synchronized with the mandrel, respectively, and a ring-shaped member that is slidable in the axial direction with respect to the mandrel is arranged, and when the thickness is reduced by the mandrel, the upper and lower surface rolling of the material to be rolled by the edger is interlocked. And performing a height reduction by each of the ring-shaped members. 2. A main roll and a mandrel for reducing the thickness of a material to be rolled in a radial direction while detecting an outer diameter of the material to be rolled by a tracer, and an axial height of the material to be rolled. A pair of upper and lower edger rolls for rolling, in a device that performs ring rolling rolling so that the material to be rolled has the target outer diameter, inner diameter, and height, both sides of the mandrel sandwiching the material rolling portion of the material to be rolled In addition, a ring-shaped member which is synchronously rotated with the mandrel, and which is slidable in the axial direction with respect to the mandrel, is arranged. A ring rolling mill provided with an interval adjusting mechanism for adjusting the interval between the rolls. 3. The gap adjusting mechanism controls the gap between the ring-shaped members so as to be larger than the height of the material to be rolled before the thickness reduction by the mandrel by 0.1% or less. The ring rolling mill according to claim 2, wherein