US2345863A - Projectile - Google Patents

Description

April 4; 1944. E. G. WHIPPLE ,3 5,

PROJECTILE Original FiledMarch 4, 1939 AGEN Patented Apr. 4, 1944 PROJECTILE Ernest G. Whipple, Stratford, Conn.,:assignor to Remington Arms Company, Inc.,;a corporation of Delaware Original application March 4, 1939, Serial No. 259,842. Divided and this application AprilS,

1941, Serial No.

2 Claims. (Cl.v 29-123) This invention relates to projectiles and more particularly to the method of making jackets for projectiles.

The present application is a division of my In the process of manufacture of projectile jackets on a mass production basis, it is evident that some simple and efficient means must be employed to secure the widened portion near ofan expanding punch or other: and more com- -plicated tools.

' I have illustrated one method by which the cup the base of the jacket. This prohibits the use 55 prior co-pending application, Serial No. 259,842, 5 and jacket m yf m y use a punch filed March 4, 1939, now Patent No. 2,321,344, --and die. Ihave found that the metal blank'used issued June 3, 1943, should be of substantially the desired finished As explained in the aforesaid application; with thickness of e major l p o fl t e jac et the advent of smokeless powders and increase and that this thickness ShOllld'IlOtlbG substanin velocities, the use of lead projectiles, particu- 1 reduced during subsequentformmg Opera larly for their mushrooming characteristics-be tlonscame impossible because the lead was stripped IIIFIgS- 63 mcluswei the blank at 23$ thfi by engagement with the rifiing in the barrel. Punch F 5 form 3473' The This caused inaccurate flight due to the absence punch m f Just Started Contact of rotary motion and also severely fouled the 15 "blank 28 Much has been placed mtorpositmn b of th weapon on the die 30. As the punch moves. inward To Overcome this Objection, bullets with a (Fig. 2) force is exerted against the :blankt28, hard metal jacket wereused but as. the velocities causing 1t to Start to assume cup of b ll t were continually increased it was force of the punch commences to strain the metal found that the jacket material vigmld' siep larate Egg 3 3 55; g f giz igf i ii g g gg gg from the core upon impact. As t e'jac e 'material did not have sufficient inertia it would g uzg 35: ig gg gifi f gfggfi f;

q H i e ZZZ?J iid tii liiifi fi 313E233.i iti ifi t ough the .blankwithout substantially benddesired eifect and would also'scatter portions i i g i ifzg 'ifi fi' i g fi f ggfigaa ggof the metal through the edible meat. m .It is the object of this invention to provide a i the 9 3 has z w means of manufacturing a suitable jacket to g gvm t I I h In v1iiaggera e foil}; give the desired core locking qualities so that 30 wither (F1 i fil p j j g t projectile core will not Separate from the outside edgi 'which gives in r a sid fesiztan gg i g f g figf to its fasstzlilgie througlti tizhdie anal cinasliaqugntly 1 a grea er lining on o e me a a hen f g f gigfig g f z ggisxg 23 as the sides of the cup are folded in and become h g d d. t th circular in shape (F'g. 5) and as the thickness 19 opera e 9 of the wall has not been reduced, the wall at puf'l c -l 7 1S a fragmentary Vlew of a modlfied 3| (see Fig. 5) will not be forced against the punch and there will be a widened ortion in 3 1S a Sectlona} w of of the the interior at this thinned out portion. The general Shape shown In and lts f 40 upper portion of the cup, not having been In accordance with the object of this lnventhinned out will completely ml the Space n t 15 proposed to construct a Jacket W tween the punch 29 and the wall 32 of the die Wa s Of reduced t hlcknes s 4 the a porno which is substantially the same as the thickness so as to form a widened interior portion and y of th Original t l, Fi 6 shows th cup maintain the exterior walls of the jacket of subjust b f r it is tripped from the punch after stantially continuous symmetry throughout their passing ompletely through the entire length. The widened interior portion Of The ubsequent forming operation may Conthe Jac et p it a e to be locked in the sist of reduction of the diameter in successive jacket and held from separation ther f m 011 punch and die processes, in which the clearances impact of the bullet. are maintained the same as the finished wall thickness similar to that in the formation of the cup. Further thinning out will take place at 3| as the jacket is passed through each smaller die and the thinned portion will be moved further up the wall at each forming because th section immediately adjacent the outside of the punch on or near the bottom of the cup is squeezed to the side wall of the cup as the piece is forced downward in the contracting portion of the die in the same way as that illustrated in Figs. 1 to 6. It is therefore seen that the widened out portion is thinned out more in each operation and is increased in extent. This thinning out is further increased by stretching as the cup is further passed through the die due to the resistance to this passage as the upper part is squeezed into a smaller diameter and the. absence of metal to fill the thinned portion due to the major wall thickness having been maintained the same.

A modified punch is illustrated in Fig. '7 which, instead of having a slightly rounded corner, has a plurality of progressively decreasing concentric shoulders 36. The punch is used'in a manner similar to that shown in Figs. 'l to 6 and the die assumes the same general shape, although the profile 35, may be a little sharper as shown in Fig. 8. The indentations weaken and extend the metal between the shoulders and cause alarger widenedvportion. The indentations also form a further locking action between the core and the jacket. The use of this type of punch also allows the subsequent formterior side wall portion removed from the base,

ing operations to be reduced. In the modification of Figs. 1 to 6, usually four drawing or closing-in operations are necessary whereas with the modification of Fig. '7 only three are necessary. This is due to the fact that the indentations produced by the shoulders at the bottom of the cup serve as a centering means for the next punch, thus insuring walls of uniform circular thickness which would not be the case if the substantially smaller punch should engage the die off-center. I have by my method produced ajacket of superior core-locking qualities. The core-locking means wherebythe core is held in position in the jacket so that they will not separate upon impact solves a problem forms of bullets. This method of making the widened portion of the interior of-the jacket, one form of which is herein disclosed, provides a cheap and efiicient means adaptable to modern quantity production methods.

The method may also be usedin the formation existent with previous the method which comprises providing a flat blank of a thickness substantially equal to the desired thickness of the major portion of the finished cup; indenting and weakening a portion of the blank which will form the interior side wall of said cup adjacent the base by using a punch with a sharp shoulder; and then forming said blank into a cup, by passing through a die and punch having a clearance substantially the same as the wall thickness of the major portion of the cup, by stretching and thinning said weakened portion adjacent said base only and maintaining the major part of said wall a thickness substantially the same as that of the blank.

2. In making a metallic cup bullet jacket having an interior side wall portion adjacent to the base, substantially all of said interior side wall portion being of greater diameter than the interior side wall portion removed from the base, the method which comprises providing a fiat blank of a thickness substantially equal to the desired thickness of the major portion of the finished cup; weakening a portion of the flat blank which will form the interior side wall of said cup with a plurality of peripheral indentations by applying thereto a punch having a plurality of sharp shoulders; and then forming said blank into a cup, by passing through a die and punch having a clearance substantially the same as the Wall thickness of the major portion of the cup, by stretching and thinning said weakened portion adjacent said base only and maintaining the major part of said wall a thickness substantially the same as that of the blank.

ERNEST G. WHIPPLE.

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