US2224997A

US2224997A - Coiling means for metal bands for the purpose of heat treating the same

Info

Publication number: US2224997A
Application number: US201494A
Authority: US
Inventors: Weisse Ernst
Original assignee: WALTHER H DUISBERG
Current assignee: WALTHER H DUISBERG
Priority date: 1937-04-22
Filing date: 1938-04-12
Publication date: 1940-12-17
Anticipated expiration: 1957-12-17

Description

Dec. 17, 194-0. wElssE 7 2,224,997

COILING MEANS FOR METAL BANDS FOR THE PURPOSE OF HEAT TREATING THE SAME Filed April 12, 1938 By His Afforneys qu gr wua. an HN Patented Dec. 17, 1940 PATENT OFFICE COILING MEANSFOR METAL BANDS FOR THE PURPOSE OF HEAT TREATING THE SAME Ernst Weisse, Rackwitz, near Leipzig, Germany, 'assignor, by mesne assignments, to Walther H. Duisbcrg, New York, N. Y.

Application April 12,1938, Serial N o.201,49'4

- In Germany April 22, 1937 3 Claims.

This invention relates to a method of and means for use in the heat treatment. of metal bands.

Metal bands, particularly such as have been produced by rolling, are heat-treated generally by rolling them up and annealing the rolled up bands in an annealing furnace or a salt bath. In such treatment it has been found that the inner convolutions of the tightly wound band become heated much more slowly than the outer convolutions, and also that, when the annealing treatment is followed by quenching, the action of such quenching on the inner portions of the rolled up band is adversely affected, or frequently even entirely suppressed,- by the slow conduction of heat. This slow conduction of heat is due not only to the long path the heat has to travel, which may amount to 80 mm. and more, depending on the thickness of the reel, but also to the fact that, even in the case of a tightly wound band, the very thin layer of stagnant air. always present between the individual convolutions, acts as a heat-insulator.

A further drawback in the method hitherto employed is that, when the annealed reel is quenched in water or oil, it is impossible to avoid the formation of spots on the interior portions of the rolled up band, due to the uneven penetration of the quenching medium into the interstices between the individual convolutions of the reel. This formation of spots is, moreover, substantially intensified by the formation of steam, the corrosive action of the locally highly superheated steam on the metal frequently becoming unpleasantly noticeable.

The present invention aims at providing a method and a device which enable the foregoing drawbacks to be avoided. I

To this end, according to the invention, the metal band to be subjected to heat treatment is wound up into a reel with the interposition of two narrow marginal strips of appreciable thickness and of such a form as to permit the flow of gas and/or liquid intothe gaps between the individual convolutions of the roll, e. g. in the form of narrow strips of corrugated sheet metal. In this form the rolled up band is subjected to the annealing treatment-and, on occasion, also 'to the subsequent quenching. The corrugated strips enable allparts of the band to be exposed uniformly to theiaction of heat in the annealing furnace or annealing salt bath, and during the subsequent quenching of the band reel also permit uniform access of the a cooling medium to all parts of the band. In this manner the inconveniences hitherto arising due to the slow conduction of heat and the uneven access of the cooling medium are obviated.

The strips of corrugated sheet metal are preferably inserted when winding the band, and are advantageously of such dimensions and so disposed that they cover only the narrow marginal portions of the band which are anyhow cut oil of Fig.1; and

Fig. 3 is a cross section along the line CD of Fig. 1.

The metal band A, coming from the reel of the .band rolling machine (not shown in the drawing), first passes over a guide roller B and a brake C into a guide D, and from there on to a winding drum E. Between the guide D and the drum E is located a device F for correctly feeding and positioning the corrugated strips H from two drums G. As can be seen from Fig. 3, the device F consists of a shaft 11, on which are slidably mounted two guide brackets b, which can be adjusted by means of set screws in accordance with the width of the band. The guide brackets each carry a guide for the corrugated strips H winding oil from the drums G and also a vertically disposed guide roller d guided by the edge of the band A, and a horizontally disposed guide roller erolling on the band A.

A specially designed drum E, as shown in Fig. 2, is preferably used for winding the band A together with the corrugated strips H. The drum corresponding to the width of the band. After the winding has been completed, the clamping pressure is released and the wound up reel, together with the rings h, is removed from the drum E and introduced into the annealing furnace. The rings h then prevent the wound up reel from collapsing or'otherwise altering its shape under the action of the high temperature prevailing in the annealing fumace;

I claim:

1. An apparatus of the kind described, comprising rotatable means for winding 9. metal band thereon into a reel, means for controlling the advance of the metal band to said winding up means, a guide frame comprising two brackets in adjustably spaced relation to each other, an eye in each of said brackets facing said winding up means, horizontal rollers on each of said brackets adapted to suspend said frame from said metal band when moving while allowing said frame to retain a stationary position in relation to said winding up means, and vertical rollers on each of said brackets, laterally coacting with the edges of said band so as to maintain said frame in a fixed position relatively to the cross section of said moving band, at least two means for holding a stock of metal strips and delivering the same therefrom through the eyes in said brackets respectively, to said winding up means, said holding means and also said guide frame being so disposed and arranged in relation to each other and to said winding up means as to enable said strips to become continuously interposed between the convolutions of the band forming said reel and at a predetermined distance from the edges of said band.

2. An apparatus of the kind described, comprising a drum for winding a metal band thereon and into a reel, a pair of ring members for supporting said reel arranged on the drum in proximity to the edges of the band to be wound, a slit in said drum along a side-line thereof, a shaft disposed in and along said slit and eccentrically mounted in said drum so as to be adapted to be caused alternatively to protrude from and to be retracted into said drum, said shaft firmly holding said rings in position on said drum when it protrudes from the drum, means for controlling the advance of the metal band and'further at least two means for holding a stock of metal strips and delivering the same therefrom inparallel and in spaced relation to each other, to said winding up means, saidholding means being so disposed and arranged in relation to each other and to said winding up means as to enable said strips to become continuously interposed between the convolutions of the band forming said reel and at a predetermined distance from the edges of said band.

3. An apparatus of the kind described, comprising rotatable means for winding a metal band thereon and into a reel, means for controlling the advance of the metal band, and further at least two means for holding a stock of metal said strips to become continuously interposed between the convolutions of the band forming said reel and at a predetermined distance from the edges of said band.

ERNST WEISSE.