US1366717A - Method of forming tubular car-axles - Google Patents

Description

D. A. CLARK.

METHOD OF FORMING TUBULAR CAR AXLES APPLICATION F ED JAN 6 1919 1,366,717. Patented Jan 25,1921.

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DAVID A. CLARK, OF BALTIMORE, MARYLAND.

METHOD OF FORMING TUBULAR GAR-AXLES.

Application filed January 6, 1919.

To all whom it may concern.

Be it known that I, DAVID A. CLARK, a citizen of the United Eitates, residing at Baltimore, tate of lllaryland, have invented certain new and useful Improvements in Methods of Forming Tubular Car-Axles, of which the following is a specificatiton.

This invention relates to the art of metal rolling, and is based upon the discovery I have made that'tubular car axles can be very quickly and cheaply formed by rolling a pierced or tubular billet along a curved or straight pass between a bed or die and rollers operating with the bed to compress the billet interposed between the rollers and the bed from a plurality of points equidistant from each other and radially inward toward the center of the billet, without the use of any mandrel or any element at all inside of the billet itself, the opening through the pierced or tubular billet being left entirely free and unobstructed whereby the finished article will be entirely without deformations or weak points and the original density of the walls of the billet will be main tained.

In carrying out my method, as will be hereinafter more fully set forth, I may use a machine such as that disclosed by Letters Patent of the United States No. 1,212,325, which was issued to me on January 16,

, 1917, and in which a billet is designed to be treated in a curved pass between a concave die or bed and work supporting rollers journaled in or on a revoluble carrier mounted in spaced relation to the concave, or instead of the concave bed being like that illustrated in this patent, it may be fiat and the pierced billet rolled therealong and compressed between the bed and rollers carried by a carriage movable along a fixed plane, but in either event no mandrel is used and the axles are formed complete and perfect solely by the compressive action of the rollers which continuously rotate in contact with the billet, the latter being continually rolled along the bed and between the latter and the rollers and not allowed to slip or drag at any point in its traverse, this preclusion of any slipping or dragging action, in combination with the operation of the continuously moving rollers, constituting the method whereby the tubular axles are formed from pierced or tubular billets without the use of any mandrels, and manifestly Specification of Letters Patent.

Patented Jan. 25, 1921.

Serial No. 269,862.

without the inconvenience and expense incidental to such use.

I? or the purposes of illustration, I show in the accompanying drawing a transverse sectional view of a machine corresponding to the one of my patent hereinbefore mentioned, a pierced billet, and a tubular axle formed from said billet, and in the drawing Figure 1 represents a transverse sectional view of the machine above mentioned, and Fig. 2 illustrates a longitudinal sectional view of the billet and the axle formed therefrom.

In the drawing, the different parts are designated by reference characters corresponding to those used in describing and illustrating the machine in the Patent No. 1,212,325, but I deem it unnecessary to describe all of the different parts in detail so far as this present specification is concerned, as this invention relates to a method and is not necessarily confined to the machine above mentioned. I might add in this connection that the method herein described and claimed was not claimed in the patent above enumerated as it is considered to be an invention divisible from the invention of said patent and capable of being claimed only separately therefrom.

In carrying out my method of forming tubular axles from pierced billets without the use of mandrels the billet 9 is treated in a pass between a bed 2 and rollers 8 of which there may be any desired number (two in the present instance), and these rollers are :journa-led to continuously rotate around their longitudinal axes, and are carried by a carriage 5 which, like the rollers, is continuously in motion. In the present embodiment of the invention illustrated in the accompanying drawing, it will be understood that the carriage 5 rotates about its own longitudinal axis, whereby as will be manifest, the billet 9 is not only compressed toward its center from its exterior at a plurality of contact points, to wit, the rollers 8 and bed 2, but is kept continuously rolling or turning and is not permitted to rest while it is being treated or to slip or drag in the process. This forms the basis of my present invention, and I have discovered that by carrying out this method, tubular car axles like those shown in Fig. 2 of the accompanying drawing, can be quickly, cheaply and efiiciently made with- Cir out the use of mandrels Which is the object of the invention. 7

While this method is primarily designed for use in forming tubular car axles, it is to be understood that the inventionis not limited to this use, but is also applicable for use in forming other tubular metal articles of different diameters and shapes out of tubular or pierced billets and the like.

I claim:

'The herein-described method of forming tubular car axles, which consists in taking a tubular billet and compressing said billet from its exterior inwardly toward its center between a bed and a plurality of continuously rotating rollers the points of contact of the bed and rollers With the exterior of the billet being equidistant, the rollers beingmoved along the bed as Well as rotating about their longitudinal axes whereby the billet itself will be continuously rolled DAVID A. CLARK,

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