US2483597A - Supplemental forging press die - Google Patents

Description

Oct. 4, 1949. c, SCHOGREN 2,483,597

SUPPLEMENTAL FORGING PRESS DIE Filed March 22, 1946 WITNESSES:

lNVENTOR CQRL E .\SCHOGN.

(79 [form/M an/MM ULSATTORNEYS.

Patented Oct. 4, 1949 V UNITED STATES PATENT OFFICE .1

' 2,483,597 1 1 SUPPLEMENTAL FORGING PRESS DIE Carl E. Schogren, Pittsburgh, Pa., assignor to vHeppenstall Company, Pittsburgh, Pa., a corporation of Pennsylvania Application March 22, 1946, Serial No. 656,458 b 1 This invention relates to forging press dies and, in particular, to the dies used in the forging of shafts or rounds.

vOrdinarily a shaft forging is carried out in two steps. In the preliminary operation a heated billet or workpiece is forged between flat surfaced dies, during which forging the operator turns the billet on its axis and progresses it longitudinally through the press until a substantially round though angular blank is produced. The final operation, which is the rounding ofi of these angles, usually has been accomplished by substituting grooved supplementary dies for the flat surfaced dies used in the preliminary step and re-running the angular shaft through these grooves. Although this process produces a satis factory product, it is subject to a serious handicap in that, during the time that it takes to substitute the grooved dies for flat surfaced dies, the shaft has cooled to such an extent that reheating is necessary before the final rounding can be carried out.

,An object of this invention is to provide a supplementary die mechanism which can quickly and easily be placed in operative position after each preliminary forging operation.

Another object is to provide, for use in a shaft or round-forging press, a supplementary die mechanism which can be expeditiously placed in position to carry out the final roundingoperation.

Another object is to provide, for use with a forging press, a supplementary die mechanism which can be expeditiously placed in operative position and which includes means for maintaining the mechanism in said operative position.

According to this invention, a removable and temporary supplemental die mechanism is provided for use in a forge press having the wellknown stationary lower die and a reciprocable upper one. The die mechanism comprises supplementary lower and upper dies, the lower being formed to rest on the stationary forge press die and the upper formed to be engaged by the reciprocable die. The supplemental dies are attached to each other by toggle links which are pivotally connected to the frontand rear faces of the dies, and means are provided which act between the supplemental dies to yieldingly urge them away from each other. The ends of the toggle links are extended belowthe bottom of the lower'and. above the top of the upper supplementary dies to form lugs for engagement by the front and rear faces of the stationary and reciprocable dies. The placing of-the supple- 5 4 Claims (01. 78+c0) mentary die mechanism in position takes so little t me that it is not necessary to reheat the workpiece, thereby greatly increasing the efficiency of the forging operations. Further, any tendency of the mechanism to slide out of its operative position during the forging is counteracted by the engagement of the toggle link lugs by the front and rear faces of the stationary and reciprocable forge press dies.

The preferred embodiment of my invention is illustrated in the accompanying drawings, of which Fig. 1 is a somewhat diagrammatic front view of .a forge press with the supplementary die mechanism in operative position, and Fig. 2 is a side view of the die mechanism taken on the plane indicated by the line IIII of Fig. 1.

Referring to the drawings, a forging press of the type well known to the art is provided havmg a lower entablature l upon which is mounted a stationary die 2, and a reciproca-ble cross head 3 which securely holds a reciprocable upper die 4. Columns 5 extend through the entablature and are engaged by the cross head which is vertically reciprocated by suitable fluid pressure mechanism that is not shown.

In the preliminary forging of shafts from blanks, dies 2 and 4 are flat surfaced and a blank (not shown), which may be held externally of the press by a crane and engaged by tongs, is turned and fed progressively through the dies from the front to the rear of the press. On completion of this preliminary operation, the blank has assumed a substantially round though somewhat polygonal shape and must be finally rounded in a finishing operation which requires the use of grooved dies.

. According to this invention a supplementary die mechanism is provided comprising a grooved supplementary lower die 6 and a similar upper die 1. Die 6 is formed to rest on main lower die 2, and die I is similarly formed to be engaged by reciprocable die 4. These supplementary dies are provided with openings to receive bolts 8 on which the ends of pairs of toggle links 9 and II] are pivotally mounted. There are four like pairs of such toggle links, two of which are pivotally attached by bolts 8 to the front and two to the rear vertical faces of the supplementary dies adjacent to their ends. Extending through registering openings in the free ends of the front and rear pairs of links 9 and H1 at one end of the supplementary dies there is a bolt H which, together with a spacing sleeve l2 that surrounds t, p v t co n t he free nd each pair of such links to each other to form a toggle, and also connects the front toggle to the rear toggle. It is noted that the supplementary upper die is not attached to reciprocable die 4, and, therefore, means are provided to cause upper die I to rise with the reciprocable die when it is lifted by the cross head. Such means comprise upper and lower arms I3 and I4 which extend between the pairs of toggle links that are attached to the front and the rear faces of the supplementary dies at each end. of such dies. Trunnions are formed on the ends of these arms and the toggle linksare provided with openings to receive them. Midway between their ends, arms I3 and I4 are provided with openings to receive a bolt I5 which loosely extends between the upper and lower arms and is maintained in the arms by means of the-bolt head and. a nut I6. An expansible spring I1 is mounted about the bolt so that its ends bear against the upper and lower arms. In a forging operation, when reciprocal die 4 has completed its down-. ward stroke and is lifted, the spring exerts pressure between arms I3, and I4 and forces upper arm I3 to rise. Due to the connection of this arm to its toggle link and the toggle link to upper die TI, the upper die will also rise to a position in which it will be ready for the next stroke. Nuts I5 limit the spreading movement of the toggles and thus control the rise of the upper die. The amount of rise can be varied by changing the position of nuts I6 on bolt 15, or difierent length bolts may be used.

As a blank is bein progressively fed into the grooves of the supplementary dies it may, by frictional engagement with one or the other thereof, tend to move the whole mechanism in the same direction, 1; e., in a direction from the front to the rear of the press along the axis of the groove. To counteract this tendency and to a n a n the m chani m n p a v p s t n, lu s t are formed on. the ends of a h oggle link and are adapted to be engaged by the front and rear faces of the stationary and reciprocal dies. There is no such tendency for the meohae nism to slide in a lateral direction and, therefore lu s t8. old the supplementary di m hani m n operating posi n.

In d scri in the opera ion of this n ent i w l e assumed that the pr imi ary torsion of a shaft has been completed and that it. is des d o perfo m he. final r un in operation. The supplemen y d e mec i m is so placed on s a i a y l w r ie. Zthat the front and. rear faces of such die en age lower lugs 18 of the toggles, and reciprocal die I- is lowered to engage lu s 18 on. th up e toggle li ine-time r d. for p riorming this. pos ti ningv opera i n is so short that the, blank does not require reh atin The bla is then ins rt d be n the roov s of s pplemental di s and l a d the forgin press is operated to perfo m the desired ni h ng or r n in perat on. Although, not ssary. t is pre abl dur n h fin shing p rat n for h erator no t p rmit the cross head to rise to such an extent that the en ag ment of up lugs with the ecipr cal die is broken. When the finishing operation is completed cross head 3 is raised to remove the lower end of reciprocable die 4 from engagement by upper lugs 18, a terwhich the supplementary die mechanism may be easily and quickly removed.

The invention has been described and illustrated according to what is considered to be its 4 best embodiment and use. However, it is understood that, within the scope of the appended claims, the invention may be practiced by other forms and in other ways than that herein disclosed.

I claim:

1. A removable temporary die mechanism for use with a forge press having a stationary lower die and a reciprocable upper die, said mechanism comprising a lower supplementary die formed to rest on a stationary die of a forging press, an

upper supplementary die formed to be engaged by a reciprocable die of a forging press, toggle links extending between said supplementary dies and pivotally connected to the front and the rear faces thereof, the ends of said toggle links having projections formed to extend below the bottom of the lower and above the top of the upper supplementary dies to form lugs for engagement by the front and rear faces of the stationary and reciprooalolev dies of such press for maintaining said mechanism in. operat p s t on, and m n acting between said supplementary dies for yieldinsly urgin them a ay f m h other.

2. A removable temporary die mechanism for use with a forge press having a stationary lower die and a reciprocable upper die, said mechanism comprising a lower supplementary die formed to rest on a stationary die of a forging press, an upper supplementary die formed to be engaged by a rcciprocable die of a forging press, toggle links extending between said supplementary dies and pivotally connected to the front and the rear faces thereof, the ends of said toggle links havingprojections formed to extend below the bottom of the lower and above thetop of the upper supplementary dies to form lugs for engagement by the front and rear faces of the stationary and reciprocable dies of such press for maintaining said mechanism in operative position, arms extending between the toggle links at the front face of the supplementary dies and those at the rear face thereof, and springs acting between said arm for y ldin ly u g Sold s plem ry di s away. fro ea h t r.

3. A removable temporary die mechanism for use. wit a ioree ess hav a sta i a yl w r die and a reciprocable upper die, said mechanism ompris n a lower supp em n ary d formed t rest one stat o ary di f a forging p ss... an upper supplementary die formed to be engaged by a reciprocable die of a forging press, toggle links extending between said supplementary dies and pivotaii-y c nne ted o e ro t and the. rear races ereo he n f s d toggle n sha c projections medto ex end. belo the t m of the. lower and a v he t p of th upp supelemen ary d es t form-lugs for en gement, y, the fron a d rear a es of he stati na y an reciprooable d s. of such pre s for ma ain g aid mechanism operati e posi o arms tending. between the'toss e links a the iron int or he sup lemen a y di s and th sev t he rear eeeth re f. bolts extend n loosely through said a d, p ov dedw th heads r l miting the spr ad m vemen of'the t g s. and springs surroundi g a d bolts and hearing at their ends iiponseid arms f r v l n l u gi g sa d implemen ary dies way fr m each other.

i. A rem vab empo ary d e m chanism for use. within sha t forg ng-P ess having a-statiom arylower ie and a r iprooable upper die pro. videdwi hflat w king surfaces fo prel minary for in operat ons; sa d mechan sm comprising a-lower supplementary die formed torest on. a

'5 stationary die of a shaft forging press, an upper supplementary die formed to be engaged by a reciprocable die of such press, said supplementary dies being provided with working faces having grooves extending from the front to the rear faces thereof, toggle links extending between and pivotally connected to the front and the rear faces of the supplementary dies, the ends of said toggle links having projections formed to extend below the bottom of the lower and above the top of the upper supplementary dies to form lugs for engagement by the front and rear faces of the stationary and reciprocable dies of such press for maintaining said mechanism in operative REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 758,797 Thul May 3, 1904 1,772,600 Dorman Aug. 12, 1930

Images