Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work
Patent
1997-02-25
1998-11-03
Hail, III, Joseph J.
Metal deforming
By use of roller or roller-like tool-element
With tool inside hollow work
B21B 2506
Patent
active
058292969
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a device for placing plugs on plug mills, and more particularly, to a method and device for placing a plug on the rolling line of a plug mill, moving the plug out of the rolling line once a tube is formed while simultaneously moving another plug onto the rolling line, cooling and/or lubricating the plug, and raising the plug onto the rolling line again.
2. Description of the Prior Art
Devices for placing plugs on plug mills are disclosed in patent numbers DE-A 1752383, GM 7148215 U1, and DE-A 2700589. The devices disclosed in these references position a conical drum below the rolling line configured with a plurality of pockets about its circumference into which the plugs slide after slipping down on a slide. In particular, DE-A 1752383 and GM 7148215 U1 include such a pocket which is positioned at an upper vortex of the device and which is shaped complementary to the shape of the upstream and downstream guidetrack. Patent number DE-A 2700589 accomplishes a similar result by using a pusher to push the plug out of the pocket of the conical drum onto a trough-like rail section which is then pivoted into the rolling line.
Similarly, patent number DE-A 2553580 discloses a device for placing a plug on a plug mill which uses a pivoting device to lift a plug arriving from a slide onto an inclined lift and push it up to the level of tie rolling line. A carriage which can be moved longitudinally on a conveying track arranged obliquely relative to the rolling line accelerates the plug so strongly that it slides into the roll gap by utilizing its kinetic energy.
All the devices discussed previously have the disadvantage that they either require a great deal of space or are not reliable under the conditions of rugged rolling operation, and thus frequently fail. This is particularly true for the conical drum, the size of whose pockets is determined by the largest plug to be used. Smaller plugs are therefore virtually not guided in the pockets, with the result that the smaller plugs may come to rest in the pockets misaligned or facing in the wrong direction, in either case, rendering the plug unusable for rolling. In addition, visual inspection of the plugs as they circulate through the mill is complicated by the mismatch between the drum pocket and plug size.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide an optimal method and a space-saving lifting device which is capable of faultless operation for a large range of plug dimensions and which permits effective visual checking of the circulating plugs.
The space-saving design is achieved by moving the lifting device along an approximately elliptical path which lies in a plane perpendicular to the rolling line. The long axis of the elliptical path is situated approximately parallel to the sliding line of the plug and offset to the side only slightly relative to the rolling line in the direction of the operating side. The upper vertex of the path lies above the edge of the guide channel of the rolling line. This path shape is achieved by means of a crank drive which has three wheels of equal size, two of which are constructed as spur gears, rotating in the same direction and two intermediate wheels, all pivotably connected via cranks to the lifting device. As a further space saving measure, the location where the plug is taken off before being raised is arranged offset to the side of the rolling line. To move the plug to the offset location, a pivotable lever is arranged at the end of the slide having a trough-shaped lateral extent which forms a continuation of the slide. This lever is connected kinematically to the movement cycle of the lifting device via a push-pull rod which is pivotably fastened to a gear wheel of the crank drive which has a worm gear rim and a spur gear rim. If the plug were to remain in the plane of the rolling line, the fulcrum of the taking-up lever would have to be arranged offset to the side even further
REFERENCES:
patent: 3762201 (1973-10-01), Schonfeld et al.
patent: 3924435 (1975-12-01), Franceschina et al.
patent: 3975937 (1976-08-01), Kamimura et al.
patent: 4038854 (1977-08-01), Jones
patent: 4127998 (1978-12-01), Meurer et al.
patent: 4638655 (1987-01-01), Sebastian et al.
Brensing Michael
Effertz Wilhelm
Im Brahm Walter
Butler Rodney
Hail III Joseph J.
Mannesmann Aktiengesellschaft
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