JPH0714537B2 - Ring rolling mill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ring rolling mill for producing a large-diameter ring material having an irregular cross section, which is used in aircraft and the like.

"Prior Art" Fig. 2 is a configuration diagram of a general ring rolling mill. In the figure, reference numeral 1 denotes a main roll that is driven to rotate, and 2 denotes a main roll 1 and a ring material R is sandwiched and pressed. While being driven, the mandrel 3 is a centering roll that keeps the ring material R in a perfect circle, and 4 is an axial roll that sandwiches the ring material R from above and below to adjust the width.

This type of ring rolling mill is also used for manufacturing a ring material having an irregular cross section, in which case the shape of the main roll 1 and the mandrel 2 is changed from a simple cylindrical shape to an irregular cross section as shown in FIG. 3, for example. It is changed and rolled.

[Problems to be Solved by the Invention] However, in the case of manufacturing a ring material having an irregular cross-section as described above, if there is a large change in the outer diameter of the main roll 1 and the mandrel 2 in the axial direction, the rolling surface And a peripheral speed of the surface of the ring material R does not coincide with each other, and a local frictional force is generated there. This frictional force causes the ring material R to be distorted or twisted, and the circularity of the ring material R is rounded. There was a drawback that it lowered.

"Means for Solving Problems" The present invention has been made to solve the above problems,
Either one or both of the main roll and the mandrel, the rolling surface constituting member, is axially divided into a plurality according to the average outer diameter of the rolling surface, and by making each of these divided parts relatively rotatable, the rolling surface The local friction between the rolling surface and the ring material due to the difference in peripheral speed is prevented.

"Embodiment" FIG. 1 shows a main part of an embodiment of a ring rolling mill according to the present invention. In the figure, reference numeral 10 is a main roll and 11 is a mandrel.

The main roll 10 is a rotationally driven main roll central body 10A.
An annular sleeve lower body 12 is rotatably attached to the outer periphery of the member 14 and is fixed to the central body 10A with a bolt 13
The sleeve intermediate body 15 is fixed via the above, and the sleeve upper body 16 is rotatably attached via the upper surface pressing member 17. The sleeve upper body 16, the sleeve intermediate body 15, and the sleeve lower body 12 constitute a rolling surface of the main roll 10 by the outer peripheral surfaces thereof, and the sleeve upper body 16 and the sleeve lower body 12 have rolling surfaces as compared with the sleeve intermediate body 15. The average outer diameter is relatively small. The position where these boundary surfaces are set is determined based on the outer diameter and the area of each part of the rolled surface of the main roll 10. The sliding surfaces of the respective sleeve parts 12, 15, 16 are fitted with antifriction members 18 to 23, respectively, such as a copper-based material, and particularly fitted to the inner peripheral surface sides of the lower sleeve body 12 and the upper sleeve body 16. Lubricating oil is supplied to the antifriction members 19 and 23 from the outside through oil supply passages 24 and 25 formed inside the central body 10A and the member 17, respectively.

On the other hand, the mandrel 11 includes a sleeve lower body 30 having a relatively small average outer diameter and a sleeve upper body having a large average outer diameter on the outer circumference of a cylindrical mandrel central body 11A provided rotatably.
31 and 31 are rotatably attached via an antifriction member 32. A ball bearing 33 is provided between the sleeve upper body 31 and the lower body 30, and these are relatively rotatable. The outer peripheral surfaces of the sleeve upper body 31 and the lower body 30 form a rolling surface of the mandrel 11 having the same width as the rolling surface of the main roll 10.

In the ring rolling mill having the above configuration,
When the ring material R is sandwiched between the main roll 10 and the mandrel 11, the ring material R is circumferentially rotated by the sleeve intermediate body 15 fixed to the main roll central body 10A, and the sleeve upper body is rotated. Each of the lower body 16 and the lower body 12 matches the peripheral speed of the contact surface of the ring material R and rotates at a speed different from that of the sleeve body 15. Also in the mandrel 11, since the sleeve upper body 31 and the lower body 30 each rotate at the peripheral speed of the contact surface of the ring material R, the rolling surface of each part and the ring material R
Friction due to the difference in peripheral speed is less likely to occur between the ring material R and the surface of the ring material R, and distortion or twisting due to frictional force can be prevented from occurring in the ring material R. Therefore, according to this ring rolling mill, it is possible to easily carry out highly accurate manufacturing of a ring material having an irregular cross section, which has been difficult in the past.

The present invention can be applied to the manufacture of ring materials having any cross-sectional shape by changing the shape of each part of the sleeve according to the cross-sectional shape of the ring material B to be manufactured. Also,
In the above example, the sleeve of the main roll 10 is divided into three, and the sleeve of the mand del 11 is divided into two.
The number of divisions can be increased or decreased depending on the shape of the
When either the inner peripheral surface or the outer peripheral surface is a simple cylindrical shape, the sleeve on the side abutting it may not be divided.

Further, in the above example, the sleeve upper body 16 and the lower body 12 of the main roll 10 only passively rotate with the ring material, but these are driven at an optimum rotation speed different from that of the intermediate body 15. May be In that case, since the load on the ring material R can be eliminated by the friction on the sliding surface,
The distortion of the ring material R can be further suppressed.

"Effect of the invention" The ring rolling mill of the present invention divides one or both of the main roll and mandrel rolling surface constituent members into axial plural parts according to the average outer diameter of the rolling surface, and these are divided. Since each part can be rotated relative to each other, friction due to the peripheral speed difference between each rolling surface and the ring material surface is less likely to occur, and strain and twist due to this frictional force are prevented from occurring in the ring material. be able to. Therefore, it is possible to easily manufacture a ring material with a cross-section having an irregular shape with high precision, which was difficult in the past.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an essential part of an embodiment of a ring rolling mill according to the present invention, FIG. 2 is a configuration diagram of a general ring rolling mill, and FIG. 3 is a problem of a conventional ring rolling mill. FIG. 10 …… Main roll, 10A …… Main roll central body, 11 …… Mandrel, 11A …… Mandrel central body, 12 …… Sleeve lower body (rolling surface component), 15 …… Sleeve middle body (same as above),
16 …… Sleeve upper body (same as above), 17 …… Top surface pressing member,
18 to 23 …… Antifriction member, 30 …… Sleeve lower body (rolling surface component), 31 …… Sleeve upper body (same as above), 32 …… Antifriction member, 33 …… Ball bearing.

Front page continuation (72) Inventor Katsumi Abo 1230 Kamihidani, Okegawa City, Saitama Mitsubishi Metals Co., Ltd. Okegawa No. 1 Works (56) References Japanese Patent Publication Sho 59-18140 (JP, B2) Japanese Patent Publication 1- 47264 (JP, B2)

Claims (1)

[Claims] 1. A ring rolling mill which rolls while rolling a ring material while circumferentially sandwiching the ring material between a rotary driven main roll and a rotatable mandrel. A ring rolling mill characterized in that one or both of the mandrel rolling surface constituent members is axially divided into a plurality of parts according to the outer diameter of the rolling surface, and each of these divided parts is relatively rotatable.