US1496130A - Valve-heading die - Google Patents

Description

June 3 1924.

G. R. RICH VALVE HEADING DIE Filed June 1923 (JEN/612607; fizoye 72 72 1 071,

his

Patented June 3, 1924.

STATES PATENT OFFlCE,

GEORGE R. RICH, OF BATTLE CREE-K, MICHIGAN, ASSIGNOR TO RICH STEEL PRODUCTS COMPANY, OF VERNON, LOS ANGELES, CALIFORNIA, A CORPORATION T5 CALI- FORNIA.

VALVE-HEADING DIE.

Application filed June 27,1923.

T 0 all whom it may concern.

Be it known that I, GEORGE B. RICH, a citizen of the United States, and a resident of Battle Creek, Calhoun County, Michigan, have invented certain new and useful Improvements in Valve-Heading Dies, of

which the following is declared to be a full,

clear, and exact description.

This invention relates to valve heading dies and its principal object is to provide a rockably supported, head forming die of novel construction by which the heads of poppet valves may be formed with greater precision and in less time than is ordinarily taken in forming the same kind of valve head. In the past it has been customary to employ a die for forming the heads of pop pet valves, which is capable of being turned in its support so that the operator, upon observing that the metal which forms the head tends to flow in one'direction when being hammered, turns the die to overcome this difliculty, but considerable time is consumed in the operation of frequently turning the die during the hammering process and production is thereby slowed up. In accordance with the present invention, the die is arrangedso that it may be rotated if desired, but it is loosely and rockably contained in a support so as to enable it to be tilted at the will of theoperator so as to direct the flow of metal. The tilting may be done instantly upon observing that the metal tends to flow in any particular direction, and a great deal of time and labor is thereby saved, in fact enabling me to pro duce more than double the number of pop pet valve bodies than with the old processes.

With these and other objects and advantages in View, this invention consists in a rookable head forming die. It further con sists in the several novel features hereinafter fully set forth and claimed.

The invention is clearly illustrated in the accompanying drawing, in Which:

Fig. 1 is a fragmental side view illustrating, in outline, a power hammer such as is commonly employed in forming the heads of poppet valves and showing a simple embodiment of my present invention applied thereto; Fig. 2 is a detail, central, vertical section through the die andanvil; Fig. 3 is a detail, central, vertical section through the die and anvil showing the die tilted, the section through the die being taken at Serial No. 647,979.

right angles to that shown in Fig. 9., and Fig. 4 is a plan of the die and anvil.

Referring to Fig. 1, the reference character A, designates a power hammer which may be of any of the common and well known forms of power hammers used in the metal working art for hammering metal into forms. The reference character a, designates the hammer arm, and a the base upon which the anvil 5 is supported and se cured in the usual manner. B designates the valve heading die, which holds the stock from which the valve is made, and C designates the upper or hammer die which is secured to the hammer arm a, and cooperates With the die B in the formation of the valve head. The anvil 5 is formed with a cylindrical socket 6 which extends down from its upper face and the bottom 7 of said socket is concave, the radius of the curve of the concavity being quite long, say twenty-five inches or thereabouts. Leading down through the bottom of the anvil socket is a hole 8 which opens through the bottom of the anvil.

The die B rests upon the concave seat or bottom 7 and its lower end face 9 is made convex in form and conforms generally to the concave surface of the seat or bottom 7 of the anvil. The die B is cylindrical in form and its diameter is slightly less than the diameter of the socket 6 to enable it to rock therein, and for the purpose of illustration the difference in diameter may be of an inch or thereabonts. but this is not material to the invention, broadly considered. The die B projects above the anvil and is formed with a recess or socket 16 in its upper end in which is secured a die insert 11. The die insert 11 is secured in the body portion 12 of the die by a driving fit and is preferably made of high speed steel, tungsten or other high grade steel and the body portion is preferably made of chrome-nickel steel although it is to be understood that I do not desire to limit myself to the particular materials mentioned, as the entire die may be formed in a single piece of metal, but inasmuch as the upper end of the die is sub jected to the intense heat of the hot stock from which the valve is made, it Wears away more rapidly than the other parts of the body, and for this reason it is preferable to employ a separate piece of material for that part of the die which is subjected to the direct influence of the material operated upon.

The die B has a central, vertical hole 14 extending from end to end, and the upper end of the die is machined to provide a shallow, circular recess or countersunk portion 13 having the form of the lower side of the valve head which is to be formed in the die. It is to be understood that when the die B is made of two pieces of material as above described, the countersunk or recessed part 13 is formed in the die insert, and that the upper part of the hole 14 is formed in the die insert as at 14. Preferably, the part 14 of the hole is made slightly greater in diameter than the part 14- to facilitate the removal of the completed valve body from the die.

lVhen a die insert becomes worn to such an extent that it is no longer fitted for use, it is removed from the body 12 and is replaced by a new die insert. In order to fa- V cilitate the removal of the die insert, holes thereby distributing 15 are formed in the body portion 12 of the die, which holes extend parallel with the central hole 14. The die insert is removed from the body by pins or rods which may be inserted in the holes 15 and driven against the underside of the die insert.

The operation of heading a poppet valve head by the die is as follows: In accordance with the present practice, the stock from which the valve is made and which usually comprises a round bar of steel, is cut into proper length to form a complete valve. The rod is heated, and one end thereof gathered up and formed into an enlargement or head as is seen in dotted lines at 16, in Fig. 1. The remainder of the rod, which forms the valve stem is seen at 17 The head portion 16 of the stock is then re-heated to the desired degree of temperature to enable the metal to flow readily under the influences of the hammer strokes, and the stem portion 17 is inserted into the hole 14, 14 of the die. The die is placed in the anvil and the hammer arm a, is put in motion. It is to be understood that the die is handled with a pair of long tongs and that the operator grasps the upper portion of the die with the tongs during the operation of handling the die and hammering down the head. The operator carefully observes the action of the hammer upon the metal, and in case the metal tends to flow toward one edge of the countersink in the die, as is seen in Fig. 3, the operator rocks the die in a direction to bring that portion of the metal which has flowed toward one side of the die, near the center of the hammer die, and consequently brings that part of the metal closer to the hammer die, so that upon the succeeding strokes of the hammer die, the metal is crowded back toward the other side of the countersink, the metal evenly throughout the entire countersunk portion of the die, and forming an even and regular shaped head with very little if any, fin projecting from the margin thereof. In Fig.

3, the die is shown as tilted into an exag gerated angle merely for the purpose of illustration. The tilting of the die is done almost instantaneously and it may be tilted in any direction so as to cause the metal to be forced into all of the spaces of the countersink in the die. I have found in actual practice that less material can be used to form the head of the valve in a rockable or tiltable die, because the operator can handle the die quicker and easier, and thus distribute all of the metal into th countersink of the die without any unnecessary fin or waste. Moreover, I am enabled to more than double the capacity, thereby more than double the output by the use of ordinary die. From this it will be seen that in establishments where tens of thousands and more valves are constructed each day, a saving of one half or more of the time of the workman who heads the dies is of great importance and of great value, enabling me to produce valvesat a less cost than has been attempted heretofore. It will be observed that the die does not swing on a fixed axis but rocks or rolls in any direction on its support, whereby its point of support is shifted as it is moved about.

More or less variation of the exact details of construction is possible without departing from the spirit of this invention; I desire, 5

therefore, not to limit myself to the exact form of the construction shown and described, but intend, in the following claims, to point out all of the invention disclosed herein.

I claim as new and desire to secure by Letters Patent:

1. A valve heading die comprising a die support and a shaping die formed with a recess at the top thereof in which the valve head is shaped, said die being loosely contained'and rockable in said die support.

2. A valve heading die comprising a die support and a rotative and rockable die formed with a central stem receiving hole and a recess at the top thereof in which the valve head is shaped, said die being loosely contained and rockably mounted in said die support.

3. A valve heading die comprising a die support having a socket therein and a rockable die formed with a stem receiving hole and a recess at the top thereof in which the valve head is shaped, said die being loosely and rockably mounted in the socket of said die support.

4. A valve heading die comprising a die support having a socket therein formed with a concave bottom portion and a rockable die formed with a central stem receiving hole llO and a recess at the top thereof in which the valve head is shaped, said body having a convex lower end seated on said concave bottom portion of the socket and being loosely and rock-ably mounted therein.

5. A valve heading die comprising a rockably mounted body portion having a free universal movement upon its support and formed with a recess in its free end, and a die insert secured in said recess by a driving fit, said die insert being formed with a recess in its upper side in which the valve head is shaped, and there being a central hole leading down from said recess.

6. A valve heading die comprising a rockably mounted body portion formed with a recess in its free end, and a die insert secured in said recess by a driving fit, said die insert being formed with a recess in its upper side, in which the valve head is shaped, and there being a central hole leading down from said recess, and said body being formed with other holes parallel with said first mentioned hole through which pins may be in serted for ejecting the die insert from the body portion.

7. Valve heading die mechanism comprising a hammer die, and a lower, rockable valve heading die cooperating therewith, said tiltable die being loosely and rockably mounted, whereby it may be manually tilted at Will relative to the hammer die.

GEORGE E. RICH.

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