US1987234A - Method of forming valves - Google Patents

Description

Jan. 8, 1935.. J. B. HILL METHOD OF FORMING VALVES Filed July 28, 1935 IR 1 iii J ames .B.

my wm wb w Gum/MAW reducing the Patented Jan. 8, 1935 The invention relates valves more particularly bustion engines and has for ME'rnon or FORMING VALVES James B. Hill, Detroit, Mich. Application July 28, 1933, Serial No. 682,701

8 Claims. (Cl. 29- -1563) to the manufacture of for use in internal comits object simplifying and expediting'the process of manufacture and cost of the manufactured product.

To this end-the invention consists in the process as hereinafter set forth. In the drawing: Figs. 1', 2 and 3 show th mam; in the several stages of rolling the same to form a stem;

Fig.4isa

diagrammatic cross section illustratingthe manner in which the blank is rolled;

- Fig.5 shows the step of re-fashioningthe head portionof ablank to form a valve head;

Fig. 6 is an elevation showing the step of completing the-stem;

Figs. '1, 8, 9 and 10 are views similar to- Figs.

1 to 3 showing a modified In the manufacture of bustion engines, and valves, it is desirable to portion of the stem process. valves for internal commore especially exhaust form the head and the exposed to the hot exhaust gases of a relatively non-corrodible metal which can stand the high heat.

On the other hand, the

portion of the stem which engages the guide bearings can be satisfactorily made of a different grade of metal. The

first step of my improved process is designed to quickly fashion a blank with a head portion of sufficient volume to form the valve head and an integral stem portion of reduced diameter.

This

I accomplish by the rolling of a cylindrical blank about its longitudinal axis and between co-acting eccentric rolls which gradually reduce the diameter of the stem portion and increase Preferably this is accomplished as illustrated in A is the original cylindrical blank having head forming portions B and C stem forming portion D. the eccentric rollers E and Figs. 1 to 3 in which and an intermediate This blank is rolled by F first engaging the portion of smallest radius and tion by a portion H of the points G and H in radius so that when tween these rollers E and F moving in the length thereof.

G thereof which is completing the operalarger radius. Between there is a gradual change the blank is rolled bethe direction indicated by the arrows, it will be progressively reduced from the full diameter to the diameter of the stem I. of the rolling of the as indicated at J so as to each having a head K and Just prior to the completion stem it is centrally severed form two like blanks, a stem I. This rolling operation is performed upon a heated blank and is so quickly blank disengages from accomplished that when the the rolls it still retains tion K is so calculated as .ficient to hold the blank in most of its original heat in the thereof. Thevolume or mass of this head'por to equal the volume or mass of the completed valve head. The blank is then transferred to a die L in which the-head 3 heat as an exhaust valve, as for instance an inlet valve, the'process may be modlfiedto form the' entire length of the stem integral with the valve head. This is illustratedin Figs. 7 to 10 inclusive in which 0 is the original blank'which' isrolled to form a head P of sufficient volumefor forming the valvehead, a stem portionQ gradual ly reduced in diameter and a head portion R sufengagement with the At the completion of the rolling operation this head portion R is rolled down to the same diameter as the stem, as indicated in Fig. 10. From this point on the operation is the same as shown in Fig. 5 in which the head portion P is re-fashioned into the valve head M.

My improved process has the advantage that in the rolling of the stem around its own axis and gradually reducing the diameter thereof, there is no tendency to cident to some of the processes used for reducing diameter. Furthermore, the reduction is so quickly accomplished that the blank remains at proper heat for the head forming operation as indicated in Fig. 5. Thus the production of a forming rolls.

single rolling machine is much greater than can be obtained by any other process and by avoiding the necessity of reheating the blank for the succeeding step, the process is further expedited and simplified.

Another advantage of my improved process is that the blanks may be worked at a lower heat than with processes heretofore used. Thus I preferably heat the blank to not over 1800 F. before the rolling process and without reheating, refashion the unrolled portion to formthe head. The product thus obtained is superior to a product formed from a blank more highly heated. Still another advantage of'my process is that I eliminate the necessity of annealing the blank form overlaps or other defects inhead 'portionili 10:. not subjected to as high equal inzvolume" to the completed valve head, and in refashioning the head portion of said rolled blank to form the head of the valve. g

3. The method of forming valve stems which consists in rolling a heated cylindrical blank about its own longitudinal axis and between eccentric rolls, having a portion of the radius to receive the full diameter of the blank and'a' portion of the radius to reduce the blank to the diameter-eithestem, 2. portion only of the length of said blank being thus reducedin diameter leaving: a portion J of :theyoriginal diameter and of a length to .be

equal involume tothe valve head, and in refashioning the head'portion of said blank while still under'its original heatto form a valve head thereof; t- 14. Themetho'd of formingvalves which consists in-rolling aheated cylindrical blank about its longitudinal-axisand between eccentric rolls which engage only an intermediateportion in the length of the blank andwhichj graduallyreduce the diameterof .said portion and increase its length,,leavinghead portions at the opposite ends thereof, removing one of said head portions with thestem integral therewith and refashioningsaid head portion to form a valve head.

The methodof forming valves which consists in rolling a heated, cylindrical blank about diameter to' form 7. The method of forming valve blanks which ,consists in rolling a cylindrical blank about its its own axis and between eccentric rolls which engage an intermediate portion only of the length of said blank, leaving at opposite ends head portions of the ,original'diameterand of a length to each be equal in volume to a valve head, severing the stem portion of said blank at the longitudinal center thereof to form two like headed and stemmed blanks and in refashioning the heads of said blanks to form the valve heads. I

6.- The method of forming valve blanks which consists-in rolling, a cylindrical blank about its own axis with a portion of the length thereof in contact with relatively moving surfaces progressively approaching each other to form a stem of reduced diameter and increased length and in refashioning the portion of the blank of original a valve head.

own longitudinal axis with a portion of its length in contact with relatively moving suriaces progressively approaching each other and increasing in width to form a stem of reduced; diameter and increased length and in-refashioning the portion of the blank of original diameter while stillunder its original heat to form avalve" head thereo f.. v

8. The method of forming valve .blankswhich consists in taking a cylindrical blank of a; diameter considerably in excess of the diameter. of, the

valve stem, heating said blank: to a temperature not exceeding 1800":F.=,*rolling a portion-off thev length; of I said blank about its longitudinal axis between relatively moving surfaces, gradually approaching ,each other and increasingin width to form a stem of suchportion and in-refashionlng the unreduced portion of said blankwlthout -reV-* heating toform avalvevhead. ,7 t t a I JAMES'BwHILL.

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