US1756160A - Method of pressing wheel naves and similar articles - Google Patents

Description

K. LOHS 1,756,160

METHOD OF PRESSING WHEEL NAVES AND SIMILAR ARTICLES April 29,' 1930.

Filed Sept. 14. 1928 Fig. 4

ENTOR INV KARI. L

A T Toeflsys pressing of the article.

Patented Apr. 29, 1930 earse KARL. LOHS, or AUE-IN-SAGHSEN, GERMANY Application filed September 14, 1928, Serial iq'o. 306,048, and in- Germany April 6, 1927. I

My invention relates to a process for pressing wheel-naves, motorcar-naves, and other similar articles made of one block at elevated temperatures. Such articles have been made until now of a solid block by turning and the boring and turning chips of the material very much, because the naves can be brought very nearly into the right form so that only very little machining need-be done on the work. In addition the clamping and centering are also facilitated and simplified by the initial hollow pressingof the article. 7

My process makes it possible to produce short punches and comparatively small pressings, and in that way it is comparatively easy to take the work out of the form.

My improved process consists in piercing and pressing the article at first in a form of one part and then pressing it in final form in an under socket of several parts.

The procedure is illustrated, by way of example, in its progressive steps in the accompanying drawing, in which:

Fig. 1 shows a front elevation, partly in section, of the upper pressing-stamp for the first pressing above a vertical section through the under-socket with the article therein.

Fig. 2 shows a section through the undersocket and upper-socket after the first pressing.

Fig. 3 shows a after the first pressing.

Fig. 4 shows a front elevation, partlv in section, of the upper pressing-stamp above a vertical section through the under socket composed of several parts.

Fig. -5 shows a section through the undersocket and upper-socket after the second blank front elevation of the'article F ig; 6 shows a front view of the finished pressed article. I

he example of the manufacture shown in the drawing illustrates the action of press ing in the making of back wheel-naves of a bicycle. Figures 1 and 2 show the first step in theproduction of thepartlyfinished article. The article or blankb, cut off from a rod and heated to a,white heat, is placed upon the tool W Figure 1 shows the tool or die W with the article I) set thereon and the upper stamp 0 in the highest .position. Figure 2 shows the lower die, with the upper stamp boring is partially pressed by the two punches al and d The punches (Z and (Z serve for the first and partialpressing of the hollows or recesses, the finishing pressing of' the hollows or recesses taking place in the second step of'the process. The product of the first pressing, the piece 70, is. shown in Figure Figures 4 and 5. show the second pressing. In Figure 4: the pressed piece, which is obtained in the tool W and again heated to a white heat, is set with the pressed projecting band a downwards on the punch (Z of the lower die W consisting ofseveral, for instance, segment'dike parts. The socket, whichjmay be in the form of segment-like parts 2 mounted on the die W is opened,

while the upper stamp 0 is in the highest position. Figure 5 shows the lower die with the closedsocketparts a which are forced into the closed position by the ring f ofthe upper stampo asv well as the upper stamp 0 in its lowermostposition. As the upper stamp 0 is lowered, the socket parts a are at first closed and then thepressiug of the other band it on the pressing piece p and the final shaping of the hollow for the boring take place. The article r isthen finished in the well known manner on the turret-lathe with the two projecting rings or flangesa and ii and the wholly out-pressed hollows or recesses. I

The proceeding serves naturally also for the manufacture of pressing-pieces which have only projecting rings but no hollows or only one hollow or which have only hollows but no projecting rings and so forth.

Having now particularly ascertained and described the nature of my invention and in what manner the same is to be performed, I declare that what I claim is: p

1. The method of forging wheel-naves and similar articles out of a single piece, which comprises pressing a heated, substantially solid blank in opposite directions and simultaneously forcing a portion of the flowing metal laterally of the direction of pressure, whereby an article having axially opposite recesses separated by an internal web and having an external flange is produced, and then again pressing said article and simultaneously forcing the flowing metal laterally of the direction of pressure along a plane spaced from said first flange.

V 2. i The method of forging wheel-naves and similar articles out of a single piece, which comprises pressing a heated blank and forcing the metal to flow along a plane substantially at right angles to the direction of pressure, whereby an article having an external flange is produced and then again pressing said article and forcing the metal to, flow along a plane substantially at right angles to the direction of pressure and spaced from said flange, whereby a second external flange on said article is produced.

3. The method of forging wheel-naves and similar articles out of a single piece, which comprises pressing a heated, substantially solid blank between a lower die and an upper die having an enlarged lateral recess and forcing the metal to flow into such recess, whereby an external flange is formed, simultaneously forming axially opposite recesses in said blank by forcing thereinto punches located in said dies, whereby an article having an external flange and opposite axial recesses and an internal web is produced, placing such article with its flange in alower die composed of a plurality of parts and provided with a recess for receiving such flange, and pressing upon said article with an upper die provided with an enlarged lateral recess and a punch and forcing the metal to flow into said last-mentioned recess, whereby a second external flange on said article is formed.

4. A two-stage process for the pressing of wheel bosses or like parts having laterally projecting portions at each end, which consists in subjecting a solid blank disposed in a suitable die to the simultaneous action of upper and lower punches whereby a cavity is produced at each end of the blank and whereby one punch expands one end or part of the blank into a cavity or cavities of the die, and

, subsequently placing the part-formed blank in a gang or multiple-part die and subjecting the part-formed blank to the action of further upper and lower punch elements which KARL LOHS.

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