SU115329A1 - Mill for rolling rings from thick-walled blanks - Google Patents

Description

Large diameter rings for the production of rolling bearings, aircraft engines, etc. are made from forged blanks.

When rolling on existing ring-rolling mills in the nano-rolled ring, the thin-wall thickness observed in forged blanks is not eliminated, and thin-walled rings with smooth face surfaces are not obtained. As a consequence, with further machining a lot of metal goes into chips. In the existing ring rolling mills, the mechanization of loading the blanks and unloading the rolled rings from the mill is also difficult for these operations (a large amount of manual labor with a large loss of time is required).

The proposed rolling mill is devoid of these disadvantages.

The drawing shows a diagram of a device for a ring rolling mill for rolling rings with a diameter of up to 800 mm.

The main roller 1 compresses the outer surface of the ring, two side rollers 2 compress the end surfaces of the ring, the support rollers 3 support the ring during rolling and the middle roller 4 compresses the inner surface of the ring.

One stationary support 5 of the middle roll, when adjusting the mill, moves in the axial direction by an amount necessary to align the gauges. This support is connected to an electric motor, by means of which the middle roll receives rotation before starting rolling. The second support 6 together with the middle roller is moved in the axial direction by means of the hydraulic cylinder 7 by the amount required to load the workpiece.

When loaded into the mill, the billet is placed in the chute 8, in which there is a bar 9 connected to the pneumatic cylinder 10. After the next billet is supplied, the bar 9 is turned by the pneumatic cylinder 10 and the billet rolls along the bar into the slot formed by the main roller 1 and the support rollers 3 .

No. P5392-2 -

After the workpiece is located in this slot, the middle roller 4 moves inwards, and its trunnion enters the nest of the fixed support 5. Ring rolling mode in the rolling process is determined by moving the hydraulic system 11 of the follower system 13 with the control roller roll ring.

The mill has a mechanism for aligning the plane passing through the axes of the side rolls with the center of the rolled ring. The movement of the center of the ring during rolling is associated with the movement of the slide and the control roller by the following simple relationship:

With p P

,

where: S - moving the center of the ring;

5 „- moving the slider;

SP - movement of the control roller.

This relationship is accomplished with the aid of differential 14, coupled with slats, to the slider of the control roller and tracking system 15.

The work roll is driven by a DC 16 motor with a P. gearbox.

The mechanism for unloading rolled rings consists of a system of levers and is driven by a hydraulic cylinder 18.

The side rollers 2 are driven by a DC motor 19. Side rolls are brought together after loading the billet into the mill by two hydraulic cylinders. Side rolls with drives and pressure mechanisms are mounted on the cradle 20 pivoting around a fixed point so that the plane passing through the axes of the rolls coincides with the center of the rolled ring. This movement is carried out by the hydraulic cylinder 21 of the cradle. The cylinder 21 is controlled by a hydraulic tracking system 15.

The main roller (i) and the support rollers (3) are mounted on the lower slider 22, the raising and lowering of which is carried out using the lower hydraulic cylinder 23. The movement control of the lower slider 22 is carried out using a tracking system 13.

The convergence of the support rollers 13 and their perception of the pressure of the ring being rolled out is carried out by the small hydraulic cylinder 24.

Subject invention

Claims (3)

1. A mill for rolling rings of thick-walled workpieces, having a drive main crimp, middle and two side rollers, with support rollers, characterized in that, in order to increase the quality of the profile of the rings, the side rolls in the mill are located directly near the main crimp and middle rolls and provided with a device for continuous rotation so that the axes of the side rolls are located during rolling in a plane passing through the center of the ring being rolled. 2. A mill according to Claim 1, characterized in that, in order to carry out rolling with the most rational variable reduction required, it uses a tracking system with a copier. 3. Stan on PP. 1 and 2, characterized in that, in order to simplify the loading of the blanks in the mill, the middle roll is made movable along its axis by means of a pneumatic cylinder. h -1 9