US2925305A

US2925305A - Gib for forming dies

Info

Publication number: US2925305A
Application number: US556534A
Authority: US
Inventors: Clarence B Hackman
Original assignee: Budd Co
Current assignee: ThyssenKrupp Budd Co
Priority date: 1955-12-30
Filing date: 1955-12-30
Publication date: 1960-02-16
Anticipated expiration: 1977-02-16

Description

' Feb. 16,1960 c. B. HACKMAN y 2,925,305v

GIB FOR FORMING DIES Filed D60. 50. 1955 l|| I nu 24 nl "W-IWJMIMM .23

Y G' I' A HCI/2J INVENTOR I 2o l Garance. @Hackman 26 BWM/! AGE 27 in web 17 and its guide surface 18.

f 2,925,305 Y `ons FOR FoRMlNG nnss Clarence B. Hackman, Moorestown,NJ., assigner toThe shape Budd Company, Philadelphia, Pa., a corporation of Y Pennsylvania y Y Application December 30,1955, SerlalNo. '556,534

s claims. (cl. sos-3) The invention relatesto gibs, also called wiper or heel plates, which are used for accurately guiding two parts of a forming die relative to each other. y

Such gibs, or wiper or heel plates, customarily consist of a solid piece of steel or bronze, which is cut from bar stock and accurately machined all around, into which grooves and holes are machined for the? distribution of lubricant and for reception of attachment screws.

The object of the invention is .to materially reduce i cost, time and machinery for making wiper plates.

This object is achieved by the creation of a kwiper plate l which consists of a shell-molded casting of great origv inal dimensional accuracy, which has its bearingor guide surface formed on a`v thin web `or wall, in which the required total strength and overall thickness are achieved by marginal walls projecting transversely from said thin veb, which is providedfwith ,thickenedv portions at the locations ,of holes for fastening''screws and for admission of grease, and on which grease distributing formed as part of the original casting.' y g The above outlined and further objects,` advantages and features of the inventionwill be more fully understood from the embodiment-illustrated ,in the attached drawing and describedin the following.

In the drawing; v v y Fig. lis a'fragmentary, diagrammatic [section through la forming die equipped with the novel wiper plates;

Fig. -2 is a fragmentary, largerscale lsection ofthe die kregion including the wiper plates, ythe section. being taken in plane 2-2 of Fig. 3; .y

Figs. 3 and 4 are smaller-scalel inside and outside perspectives respectively of ak single wiper plate; n

Fig. 5 is a section, on the scaleof Fig. 2, taken in Fig. 6 is a section corresponding to and on the scale of Fig. 5 through a wiper plateand the shell mold in which it is cast. n Y l The die, illustrated in Figs. 1 and 2 comprises an upper die or punch 11, a movable marginholder 12, and ay lower die and margin holder 13. As it is customary, punch 11 and margin holder'v 12 are slidably guided the one relative to the Vother withthe help of gibs or wiper plates 14 Iwhich are attachedvby set screws 15.

Each gib or plate 14 is' a lcasting which comprises a g y thin webor wall 17 witha plane 'guide surface 18, marginal reinforcing

wallsv

19 and 20, thickened

portions'or lugs

21 and 22 withholes 23 Yfor the bolts 15 and holes j 24 .communicating upon installation with grease supply conduits 25 in the dies 11 and 12, a plane supporting sur- 2.925.305 Pfenfed Feb.,v 16,1950

shells

28 and 29 are formed (over, not shown, models) of a hardenable foundry sand mixture of great dimensional stability. The shells are provided with mating projections and recesses 30 for insuring their assembly in accurately the required relative position. Upon their assembly the shells leave between' them a space exactly duplicating the shape and dimensions of plate 14 with its web .17, reinforcements 19 to 22,

holes

23, 24, and grease grooves 27.

vDuring casting of the metal through (not shown) inlets, the

shells

28, 29 are held between flask plates 31 and `32Yprovided with registry pins and

holes

33 and 34 and with vents 35. v

Plate 14 has, upon removal of the

shells

28, 29 and hardening, practically the exact dimensions of the finished plate and may'call only for light grinding of its guide surface 18 and/or attachment surface 26 so as to insure Vsmoothness of surface 18 and close tolerance in the spacing and parallelism between

surfaces

18 and 26. It may furthermore be desirable to grind the long end faces .on

reinforcing walls 19 into close tolerance of spacing and parallelism so that the plates will lit in accurately dimenchannels y sioned openings'of' the dies (Fig. 2) or so that two `or more plates vmay be used side by side in a row or bank (not shown). Such grinding will not amount to more lthan about %2 of an inch. The short end faces on reinforcing walls 20, the

holes

23, 24, and the grease grooves 27 need no machining.

From the foregoing description it will have become evident that the new plate is lighter and requires negligible machining only as compared with theY customary K wiper plates cut off from and machined out of solid,

expensive bar stock, and that it is consequently less expensive and speedier obtainable than the old plates.

The invention is .not restricted to the shape and the details of the plate shown in the drawing but is susceptible to modifications and adaptations so as, for instance, to meet the individual` requirements presented by dies of different type, size and purpose.

' What is claimed is:

1. Wiper plate for forming dies consisting of a metal casting, shell-cast closely to the ultimate shape and dimensions and having a thin web-presenting on its one side with a guiding and bearing surface kand provided on its other side with reinforcing wall portions extending transversely to said web and continuously along all margins of said web, said wall portions presenting a supporting surface" for the plate and Vproviding together with said webk an open dish-like structure,A said plate having cast-in grease grooves in said web on the side of its l rguiding surface, andl said plate being formed as part of face 26 provided on portionsf19 to 22 andexactly par- .I

alleling guide plane.18,` and grease distribution lgroov The ,formaten of plate .14 is magically the m in the casting with thickened perforated portions extending from said web in the same direction as saidvwall portions and' providing holes for attachment screws, grease conduits `and the like.` p

`2. Wiper plate for forming dies consisting of a s hellcasting of close dimensional tolerance, said casting having al thin web presentingon itsv one side a guiding and bearing surface and providedv on its other side with marginal reinforcing wall portions, said Wall portions ex- Ltending along all margins of said web, forming together -with said web a one-sidedly open dish-like structure, and presenting a supporting surface for the plate. Y

3. Wiper plate accordingto claim 2 havingl formed as part of thevcasting thickened portionsl extending from said web in the same direction as said wall portions and and dimensions is shown in Fig. 6. Two mating being provided with holes for attachment screws,M greaser y 2,214,650 Bancroft Sept. 10, 1940 conduits and the like. E' '2,313,613 Boillat Mar. 9, 1943 2,378,343 Walter June 12, 1945 References Cited 1n the le of thls patent 2,504,347 @Donnell Apr. 18., 1950 UNITED STATES PATENTS 5 2,654,925 Ensign et a1 oct. 13, 1953 1,321,478 Russler Nov. 11, 1919 1,502,393 Morris July 22, 1924 FOREIGN PATENTS 2,004,254 Taub June l1, 1935 535,343 Great Britin Apr. 7, 1941