JPS6135323Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used in a Wagner ring rolling mill (also called a ring rolling mill) that rolls annular products such as railway vehicle tires and ball races to correct uneven thickness of the annular rolled product during rolling operation. This relates to a device for

As shown in FIGS. 1 and 2, a conventionally well-known Wagner type ring rolling mill charges a perforated rough annular material into a mandrel 1, and rolls it in the radial direction between the opposing main roll 2 and the mandrel 1. It is a facility for manufacturing annular rolled products W of required dimensions and shape by pressing to expand the inner and outer diameters and rolling down in the width direction (axial direction) with upper and lower axial rolls 3,
The mandrel 1 is movable in the horizontal direction with its center axis vertically supported by a mandrel frame 4 at the bottom and a bucking arm 5 at the top. By operating the hydraulic cylinder device 7 attached to the mandrel 1, the mandrel 1 is brought closer to the main roll 2 which is rotationally driven in a fixed position, and the annular rolled product W is pressurized between the main roll 2 and the mandrel 1. It's summery.

Incidentally, the rough-ground annular material is manufactured by upsetting and perforating a steel billet heated in the previous process using a rough-field forming press, but due to the influence of the rough-ground upsetting amount and press precision, etc., as shown in Fig. 3. Thickness unevenness may occur, and when a rough annular material with this uneven thickness is rolled by the ring rolling mill, the mandrel 1 approaches or moves away from the main roll 2 for each rotation of the annular rolled product W. As a result, the spacing between them changes, and although the uneven thickness is gradually corrected by applying pressure to the main roll 2 side of the mandrel 1 by the hydraulic cylinder device 7, the uneven thickness still remains even if the diameter is expanded to the final rolling dimension. cannot be completely corrected, and therefore an extra machining allowance (finishing allowance) is required to compensate for the uneven thickness, which has disadvantages such as a decrease in yield and an increase in the number of machining steps.

In order to eliminate the above-mentioned drawbacks of the conventional technology, the present invention aims to create a structure between the mandrel frame that holds and moves the mandrel and the fixed frame of the ring rolling mill.
A stopper device that can be moved horizontally and fixed at any position is provided, and during rolling of the annular product, the mandrel is moved to the main roll side using a hydraulic cylinder device and pressurized, and the front side of the movement is stopped by the stopper device. The present invention provides a thickness unevenness correction device which is characterized by being engaged with the main roll to suppress positional fluctuations of the mandrel with respect to the main roll and completely eliminate thickness unevenness of annular rolled products. explain.

FIG. 4 is a central vertical sectional front view schematically showing an embodiment of the present invention, and the conventionally known Wagner type ring rolling mill is designated by the same reference numerals as in FIGS. 1 and 2.

In the Wagner type ring rolling mill, a cap-shaped or U-shaped stopper stopper 8 is fixed to the opposite side of the mandrel frame 4 from supporting the mandrel 1 by welding or bolting so as to protrude horizontally.

On the other hand, a stopper 9 having a locking surface facing the protruding end surface of the stopper butt 8 is attached to a stopper receiving frame 10, and the stopper receiving frame 10 is attached to the fixed frame 6 of the ring rolling mill by bolts or the like (not shown). It is fixed.

The stopper 9 attached to the stopper receiving frame 10 can be moved horizontally by a stopper drive device 11, and a threaded rod 12 is integrally or rotatably attached to the opposite side of the locking surface of the stopper 9 so that it can be fixed at any position. The stopper 9 is screwed horizontally into a screw hole provided in the stopper receiving frame 10, and a chain gear 13 is fixed to the protruding end thereof, and the stopper 9 is rotated by an electric motor 14 via a chain 15. It is provided so that it can freely move forward and backward in the horizontal direction with respect to 8, and can be fixed in the horizontal direction by stopping the drive at an arbitrary position.

The stopper abutment 8 is provided so as to cover the cylinder of the hydraulic cylinder device 7 to protect the cylinder, but the protrusion of the cylinder may be directly used as the stopper abutment, or a bar-shaped stopper abutment may be provided at another position. It may be perforated with gold.

Further, the stopper driving device 11 is provided with the electric motor 1.
In addition to the screw-moving type shown in FIG. 4, for example, as shown in FIG.
A known mechanism may be adopted, such as allowing the stopper 9 to move toward or away from the stopper abutment 8, and to stop at an arbitrary position to support the stopper abutment 8.

When rolling a rough annular material with uneven thickness using a ring rolling mill equipped with a thickness correction device having the above structure, the annular rolled product W in each case is divided into multiple stages such as preliminary rolling, main rolling, and finishing rolling. The position of the mandrel 1 with respect to the main roll 2, that is, the position of the stopper 9 with respect to the stopper abutment 8, is set and fixed in advance so that the wall thickness becomes a predetermined dimension, and the hydraulic cylinder device 7 is activated during rolling operation. The annular rolled product W is moved to a predetermined position while being pressurized by the mandrel 1, and here the stopper butt 8 comes into contact with the stopper 9 and is locked, and the working oil pressure of the hydraulic cylinder device 7 is slightly increased. The mandrel 1 cannot move in either the left or right direction in FIG. 4, that is, the fluctuation of its position relative to the main roll 2 is suppressed, and therefore the uneven thickness of the annular rolled product W is corrected each time.

Since the present invention is constructed as described above, it is possible to correct the uneven thickness during ring rolling even if the annular material had uneven thickness in the previous process, and since the position of the mandrel at the end of rolling is fixed by the stopper, By keeping the weight of the annular material constant, the annular rolled product can be manufactured with uniform internal diameter and other dimensions with high precision.

[Brief explanation of the drawing]

Figures 1 and 2 schematically show the main parts of a conventionally well-known Wagner type ring rolling mill, with Figure 1 being a plan view, Figure 2 being a front view in longitudinal section at the center, and Figure 3 being a rolling mill with uneven thickness. FIG. 4 is a perspective view showing an example of an annular raw material, FIG. 4 is a central longitudinal sectional front view schematically showing an embodiment of the present invention, and FIG. 5 is a plan view showing another embodiment of the stopper drive device in FIG. 4. It is. 1: Mandrel, 2: Main roll, 3: Axial roll, 4: Mandrel frame, 5: Bucking arm, 6: Frame, 7: Hydraulic cylinder device, 8: Stopper rest, 9: Stopper,
10: Stopper receiving frame, 11: Stopper drive device, 12: Threaded rod, 13: Chain gear, 14:
Electric motor, 15: Chain, 16: Liner, 17: Fluid pressure reciprocating device, W: Annular rolled product.

Claims (1)

[Scope of utility model registration request] In a Wagner type ring rolling mill, a mandrel 1 is provided which is movable in a horizontal direction relative to a main roll 2 and whose lower part is supported by a mandrel frame 4 and whose upper part is supported by a bucking arm 5 with the central axis in the vertical direction. A stopper abutment 8 is provided horizontally protruding from the opposite side of the mandrel support of the mandrel frame 4, and a stopper 9 having a locking surface facing the protruding end surface of the stopper abutment 8 is attached to the frame 6.
A thickness unevenness correction device for a ring rolling mill, characterized in that it is mounted on a stopper receiving frame 10 fixed to a stopper and is moved horizontally by a stopper drive device 11 and can be fixed at any position.