JPH0225236A - ring rolling machine - Google Patents

Abstract

PURPOSE:To facilitate to support rolling reaction force and to simultaneously execute rolling of plural annular stocks by providing plural mandrel rollers so that they can approach and separate by inserting and holding an annular stock to be rolled and opposing them on the outside peripheral side of one piece of work roller. CONSTITUTION:A ring rolling mill 10 can bring two stocks to be rolled W to ring rolling simultaneously, and provided with two mandrel rollers 12, 13 against one work roller 11. A rotation axis of the roller 11 is supported in the vertical direction by a rolling mill frame 14, rotation axes of the rollers 12, 13 are placed in the vertical direction, and the centers of the rotation axes of the rollers 11-13 are on one straight line. The lower end parts of the rollers 12, 13 are supported by a backing arm 16 whose upper and part can be opened and closed, on a mandrel frame 15. In this state, first of all, by opening the arm 16, the stocks to be rolled W are installed in the rollers 12, 13 so as to be inserted and held by the roller 11, and thereafter, the outside peripheral part of the stock to be rolled W is inserted and held between axial rollers 18 of the lower side. Thereafter, a hydraulic cylinder 17 is extruded, and the stock to be rolled W is brought to rolling between the roller 11 and the rollers 12, 13 which are driven to rotate.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to the improvement of a ring rolling mill, and improves productivity and supports rolling reaction force by making it possible to simultaneously roll a plurality of annular rolled materials. It was made easy.

[Prior Art] One of the methods for manufacturing annular products such as wheels for railway vehicles and ball races is a ring rolling method.

As shown in Fig. 3, the ring rolling machine that performs this ring rolling is used to charge a perforated material W to be rolled into a mandrel roll 1, press it in the radial direction between an opposing work roll 2, and press it in the radial direction to reduce the diameter of the inner and outer diameters. At the same time, the upper and lower sides are also rolled in the width direction using axial rolls 3 to produce an annular rolled product having a predetermined size and shape.

The specific configuration of this ring rolling mill was
As shown in Figure 1, which shows what is described in Publication No. 323, it is equipped with a mandrel roll 1 located on the inner peripheral side of the material to be rolled W, and this mandrel roll l has its central axis perpendicularly Orient the bottom end or mandrel frame 11
The upper end of the mandrel frame 4 is supported by a separate kink arm 5 and is mounted so as to be movable in the horizontal direction.
By moving the hydraulic cylinder 7 installed between the frame 6 and the rolling mill frame 6, the mandrel roll 1 is moved closer to the work roll 2 which is rotationally driven in a fixed position, so that rolling is performed. It has become.

[Problems to be Solved by the Invention] In such a ring rolling mill, the work roll 2 is designed to support the rolling reaction force caused by the mandrel roll 1, so the work roll 2 is quite thick so that it does not bend during rolling. There is a problem in that the hydraulic cylinder 7 for rolling down for applying rolling force also needs to be that large.

Another problem is that only one annular product can be rolled in one rolling process, resulting in low productivity.

Furthermore, there is also the problem that it is difficult to correct the shape of the rolled product to make it a perfect circle.

This invention was made in view of the problems of the prior art, and an object thereof is to provide a ring rolling mill that can easily support the rolling reaction force and that can roll a plurality of annular materials at the same time. It is something to do.

Furthermore, it is an object of the present invention to provide a ring rolling mill that makes it easy to modify the shape of a rolled product.

[Means for Solving the Problems] In order to solve the problems of the prior art described above, the ring rolling mill of the present invention has a plurality of ring rolling mills sandwiching and opposing annular rolled materials on the outer peripheral side of one work roll. It is characterized in that the mandrel roll is provided so that it can be approached and separated.

Further, a ring rolling mill that facilitates shape modification is characterized in that bending rolls are provided at least on either the entry side or the exit side of the material to be rolled.

[Function] According to this ring rolling machine, the outer circumference r1 of the work roll!
A plurality of mandrel rolls are also arranged in 1, and the material to be rolled is charged to each mandrel roll, and ring rolling is performed between each mandrel roll and the work roll. In addition to being capable of rolling, the rolling reaction force applied to the work rolls can be supported by the mandrel roll, so that the rolling reaction force can be easily supported.

In a ring rolling mill that makes it easy to modify the shape, bending rolls are installed on either the entry side or the exit side of the rolled material, and this makes it easy to modify the shape of the rolled material. We are trying to make this happen.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 are a plan view and a vertical cross-sectional view of rolls according to an embodiment of the ring rolling mill of the present invention.

This ring rolling mill 10 simultaneously rings-rolls two rolled materials W, and is equipped with two mandrel rolls 12 and 13 for one work roll 11.

The work roll 11 is supported by the rolling mill frame 14 so that its axis of rotation is perpendicular, and is rotationally driven by a drive device (not shown).

Two mandrel rolls 12.13 are arranged on both sides of this work roll 11 so that their rotational axes are perpendicular, and the centers of the rotational axes of the three rolls 11° and 12.13 are aligned in a straight line. It's Nishide.

These mandrel rolls 12 and 13 are each supported at a lower end by a mandrel frame 15 and an upper end by a backing arm 16 that can be opened and closed, and are mounted so as to be movable in the horizontal direction (rolling direction).

The base end of each mandrel frame 15 is connected to a hydraulic cylinder 17 for rolling down, and the tip of the rod is fixed to the rolling mill frame 14. By moving the hydraulic cylinder 17, the mandrel roll 12.13
It is now possible to add a reduction blade to the

In addition, upper and lower axial rolls 18 are provided at positions corresponding to the outer peripheral portion of the rolled material W.
Rolling in the width direction is now possible.

Furthermore, as shown in FIG. 1, bending rolls 19.20 are provided on the entry and exit sides of each mandrel roll 12.13 so as to sandwich the material W to be rolled from the inner and outer peripheries. It is now possible to make corrections.

Rolling by the ring rolling a10 configured in this way is
This is done as follows.

First, each backing arm 16 is opened and the material to be rolled W is mounted on the mandrel rolls 12.13 so that it can be sandwiched between the work rolls 11, and then the backing arm 16 is closed and the material to be rolled W is mounted on the mandrel rolls 12.13. The outer peripheral part is positioned on the lower axial roll 18 and sandwiched between it and the upper axial roll 18.

After that, pressure oil is supplied to the hydraulic cylinders 17 so that the hydraulic cylinders 17 are pushed out toward the work roll 11 along the fixed rods, and the work roll 11 and the mandrel roll 12 are rotationally driven in fixed positions. 13, the material to be rolled W is rolled.

Then, each rolled material W is rolled by one work roll 1.
1 and mandrel rolls 12 and 13 at the same time, production can be performed at twice the speed of conventional methods, and productivity is greatly improved.

In this way, the work roll 11 and the mandrel roll 12
．． 13 are arranged in a straight line and two rolled materials W are ring-rolled at the same time, the rolling reaction force of one mandrel roll 12 can be offset by the other mandrel roll 13, and the work roll 11 has a The accompanying bending force will not act.

Therefore, unlike conventional ring rolling using one mandrel roll for one work roll, there is no need to increase the diameter of the work roll to prevent it from bending due to rolling reaction force. 11 can be made thinner.

By reducing the diameter of the work roll 11,
It becomes possible to raise the reduction blade applied between the mandrel rolls 12 and 13, and it also becomes possible to reduce the capacity of the hydraulic cylinder 17.

After performing ring rolling for a predetermined amount in this way, or when it is necessary to correct the shape of the rolled material W during rolling, two sets of one bending roll on the inner circumference side and one bending roll 20 on the outer circumference side are used. Make it a perfect circle by controlling the position.

In this case, since the bending rolls 19 are arranged also on the inner peripheral side of the rolled material W, the shape can be easily corrected, especially when it is bent too much inward.

In addition, in the above embodiment, the case where two rolled materials W are rolled is explained, but when three or more rolled materials W are rolled, they are rolled at equal intervals on the circumference with respect to one work roll. It is sufficient to arrange a plurality of mandrel rolls, and by arranging them in this way, three or more rolled materials W can be rolled simultaneously by canceling out the rolling reaction force, and the productivity can be increased commensurate with the number of rolls. You can make improvements.

Moreover, if two mandrel rolls are arranged not in a straight line but at a certain angle with respect to one work roll, it is possible to obtain a ring rolling mill with a small installation space.

[Effects of the Invention] As described above in detail with one embodiment, according to the ring rolling mill of the present invention, a plurality of mandrel rolls are arranged on the outer circumferential side of the work roll, and each mandrel roll rolls the material to be rolled. Since ring rolling is performed between each mandrel roll and work roll, multiple rolled materials can be rolled at the same time, greatly improving productivity. At the same time, the rolling reaction force applied to the work roll can be supported by the mandrel roll, making it easier to support the rolling reaction force.

In addition, the work roll can be made thinner, and
It is possible to increase the rolling force and reduce the capacity of the hydraulic cylinder for rolling down.

Furthermore, ring rolling mills that facilitate shape correction are equipped with bending rolls on either the entry side or exit side of the rolled material. By doing so, the shape can be easily corrected or corrected.

le, 202 Bending roll on the outer circumference side.

Claims (2)

[Claims] (1) A ring rolling mill characterized in that a plurality of mandrel rolls are provided on the outer circumferential side of one work roll so as to be able to approach and separate from each other so as to sandwich an annular material to be rolled and face each other. (2) The ring rolling mill according to claim 1, further comprising a bending roll provided at least on either the entry side or the exit side of the material to be rolled.