US2206034A - Mold form - Google Patents

Description

H'. F. HAGEMEYER IOLD 'FORI Filed June 14, 1938 2 sheets-sheet 2 ATTORNEY m2@ l jazz. P. l

Patented July '2,1940'L UNITED STATES PATENT orner.

ammi l Y l MQLDCI; Ill., Iallilllor tu enry F. Hagemeyer,

Castings Patent Corporation, a corporation of Illinois .Application June 14, 1938, Sel'lll N0. 213,595 v 4 claims. l (ci. :zA- 11m My invention pertains to `a form including ay ask ring and match plate assembly, which may tinually changing variety of castings is* made in small lots, the match plates used for only one job and then discarded are a source of considerable expense. Such match platesl are relatively costly because they must be machined accuratelyV to provide a true parting surface on each mold section. kHeretofore it has been customaryA to afx the .individual patterns directly to the. match plate, so that it can be pattern group and becomes obsolete when the run of its particular group of castingsdscompleted, because of the holes drilled therein to receive screws for securingthe patterns to it. It

is extremely infrequentthat a repeat order will zo be receivedat the same time, for equal quantities of all castings corresponding to the patterns on a match plate. A choice must be-made,`

' therefore, between devoting a whole match plate to one .type of pattern, which usually 'is not war- 2s ranted by thequantity of.units required, or by shifting patterns for castings a larger numbero! which is required to new match-plates-with a different pattern assembly, when the quantity of castings corresponding to some of the patterns on the match plate has been made. The oid used with no other` a9 match plates are then discarded and the pat- 'terns whose jobs are finished are removed from "such match plates and stored.

I have devised a match plate assembly. which employs a plurality of individual pattern plates,

'each carrying a pattern, which may be assembled in `parquet fashion on a base plate. These unit pattern plates are all ofthe same sizehor in size a simple multiple of the smallest pattern plate,

40 so that a-selected group of such plates can be assembled onto a base plate of standard size adapted to accommodate a predetermined num--l ber of unit Apattern plates of the smallest size.

Such. assembly will, of course, exactly cover the plate. A further diilijculty arises in conventional pracof the sections are in exact registry as the sections approacheach other. Mold-material, such as that of the gypsum base Vtype,for example, is quite fragile and if a projecting part of one mold section is not in precise alignment Vwith its com- 5' plemental recess in the othermold section, eitherthe projection, or the surface of the other mold section accidentally struck by such` projection, or both, may be damaged. Even an injury only to a dowel may be "serious, for its'purpOsefis to prevent misalignment. of the adjoining moldl sections so that an accurate casting, rather than a lopsided one, will be produced by the metal poured into the mold cavity.

To insure accurate positioning of the mold sections during the assembling operation, I have devised registering elements for their edges which may' be engaged by a suit ble guiding deviceprior to contact of their part ng surfaces. This mechanism will guide the movement of the mold sections as they approach engagement and preferably also will support atleast one of such sections during,7 such operation. The registering elements may consist of ribs, one. on each of two oppositeedges of each mold section, extending 25 perpendicular to the parting surface and so disposed that the cope ribs will be aligned with the f drag ribs when the mold sections are assembled.

The cope ribs may be provided with shoulders intermediate their ends which may be employed in supporting the cope.

. A further consideration in the design` of my mold form and mold is to provide means for l 46 entire pattern plate receiving surface of th@ base tice in the assembly of the mold sections. Occasionally thereare parts of a mold section 'project'- ing beyond the general plane of the parting sur` face; for example, there may be dowels of a dowel and 'socket registering arrangement. When the mold sections are being placedtogether the parting surfaces are hidden from view, and it is diillcult to' tell whether -the corresponding parts" is a simple multiple of 'plate assembly in eliminating the fins on the castings, and also on the feeders for the molten metal, such as the' runner 'and gates. For this purpose I provide a groove about each mold cavity to produce a sealing ridge along the margin of each mold cavity. By the term mold cavity-pattern I refer, to all patterns on the match plate which serve to form '40 metal receiving mold cavities, including the runner pattern strip, gate pattern strips, and sprue pattern post, in addition to those patterns which form the cavities for production ofthe useful castings.`

The principal object of my invention, therefore, is to provide a match plate assembly having a plurality of interchangeablepattern plates all of a uniform size, or the size of each of which the smallest pattern plateI which may be assembled to cover a base plate in parquet., fashion. A further object is to provide such a match which the runner and sprue the pattern need not cavity forming portions` of 55 2.- be dimubed, end preferebiy for forming dowels and dowel sockets for the mold sections will remain fixed when the'lllttern plates are intel-chained.

5 sun another object is to provide mean forn forming onlthe mold sections durim the molding operation registering elements i'or usein guiding complemental mold sections while they are being assembled to form the mold.' 10- A further object is to provide means for preventingtheformation ofilnsontheusetulcastinssandalsoon thefeederasuchastbemner.

and gates.

Additions; obieou, and eepeoiouy those rosoit- .l5 ing from the particular constructionod my flaskand match plate assembly. willfbe understood from a study oi the following detailed description in coniimction f1 have illustrated a flask rim'or ring and match 20 plate assembly which I have found to be practical, but obviously many variations may he made in its structural details withinthe spirit oi' my invention as denned in the claims appended to thisspeciiication. Y 25, f Fig. lisaplan viewoithecopeilaskrim'and match plate assembly showing a representative .casting pattern mounted on a pattern plate.

Fig. 2 is a transverse section line i.

2-2 of Fig. 1. l

.f Fig. 3 is a fragmentary longitudinal section lilg. 4 isa fragmentary longitudinal section taken along line I--I o! Fig. 1. y

Fig. 5 is a fragmentary transversesection s. taken along linel-l oivPig. 1.v

ne. s is e fragmentary longitudinal seouon:

corresponding to Fig. 4 but illustrating the drag task rim and match plate assembly.

Fig. 7 is a fragmentary transverse' section 40; taken along lineal-To! Fig. 6.

me. s is e fmmenmoentrai longitudinal.4 section through assembled cope and drag: mold Fig. 9 is a fragmentary transversesection at as the position of line Il-ll of Fig. 8, showing the mold sections Just prior to their engagement.

Flg.- 10 isa fragmentary transverse section through assembled cope and drag mold sections taken along line Ill-II ot'ng. 8,

l0; Fig. Il is a fragmentary perspective view o!v the drag mold section showingl the projecting rib usedtoassistinguidingitdurlngtheoperation of assembling the cope and drag mold sections Ainto the complete mold. 1

IQ l'fig. 12 is auplanview o! a representative cast- Hglisanclevationviewot'thecastingo! ng.14is'an"agmentaryplanviewotonemold rall,oeouoio-enmloyed in forming meegaan; of.

1'ig.'15l.satransvcrsenctiontaiienonline ll-ll ofng. 14. lia. Noia a fragmentary patternemployedinformingthemoldsecticnoi' Fig. 14.

Fig. 1'I`is an'enlarged fragmentary section through cope and drag mold showing 'locomplemental sealing ridgeszjustn-ior to their engagement during the operationv of assembling the mold sections; A

Fim-18 is a fragmentary section throughcope and drag mold sections showing the saling ridges 'Il4 OfFlg. 17 after being pressed inw'mmtf I a `that shownv in Fig. 21.

wththe accompanying drawings.

. .l l. as sexen on-noe ls-ls of ng. 1i and snowing the @amm s alsothe patterns .l'lgdisah'agxnentarysoction muventional cope and drag mold sections in thel region otamoldcavityedgeiust priortoengagement oi'theirpaxtingsur!aces during theoperationoi assembling the mold sections. g

pornooramstenpme'sndoottemforformmg' 'firmer-shone of eeenng ridge tion. It will, therefore, be seen that the patterns shrinks 'during the process of solidincation and bolt receiving apertures will, of course, correspond on each of the pattern plates no matter what the plate width may be. I n each of the various pattern plate positions of'the base plate I the screw and dowels holes will be arranged in the same relative positions. l

'I'he center plate II andthe marginal plates I2 may be permanently secured to the 'base plate I in any suitable manner. A ilask rim or ring 2 may also be secured in permanent relationship to the match plate, preferably resting on the mar ginal plates I2. On the center plate II a runner pattern strip I5, shorter than the center plate, is mounted, which may be the same shape and size for both the 'cope and drag match plates, and both ends of which stop short of'the rim 2. I prefer, however, that the runner pattern in the cope match plate be higher than that in the drag match plate, to allow any dross which may iiow into the runner cavity to accumulate in the` up per portion thereof above branch gates provided in the cope mold section. In the-cope match platea sprue pattern post I6 'is also provided, preferably `located at one end of the runner pattern I5. The runner. pattern of the drag also has a sprue pattern projection I1 which produces a sprue sump in the drag section of the mold immediately below the sprue aperture fin the cope section of the mold.

Between each end of the center' plate II and the adjacent end of the runner pattern I5 I provide means constituting a pattern. for either the dowel or the socket of a dowel and socket mold section registering device. Preferably in the cope match plate a boss I8 is provided to serve as a on the other hand, will be provided a cup I9, of slightly less depth than the height of boss I8, serving as a pattern for a dowel complemental to the dowel socket formed in the 'cope mold secfor forming the dowel registering mechanism, the runner cavity, the sprue aperture, and the sprue sump are all permanently secured to the base plate I, and are entirely separate from and mounted independently of the interchangeable pattern plates Il) and I0"..

Thev manner in which the cope and drag mold sections t together is illustratedlin Fig. 8, in

which the cope sectionC is, provided with the sprue aperture I6' and a portion of the runner cavity I5', whereas the drag section D-has the sprue sump -II','located immediately below the sprue aperture I6', and the remainder of the runner cavity I5'. The sprue aperture and sump,

as well as the portions of the runner'cavity and' complemental mold cavities formed in other portions of the cope and drag, areheld in'registry by the dowels I9' of the drag seated in the dowel sockets I8' provided in the cope. JThev purpose of the sprue sump I1 is to prevent the molten metal from rushing violently and in a pulsating y.fashion nto and through the runner cavity I5', and from there into the useful castingforming portions of the mold cavity.; vAs the-metal .ows through the aperture I6 into the sprue sump I1 its inrushing force is somewhat. absorbed by the impact and turbulence thereinfand its ow becomes consolidated and 'smooth as .it enters the runner cavity. l

After each mold cavity corresponding to a useful casting has been filled with molten metal it is desirable to`provide a reservoir of metal from cooling, and which reservoir will remain liquid until such .action is substantially complete. If no source of molten metal is provided, from which the diiciency caused by such shrinkage may be made up, excessive strains will be set up in the ilnal casting, and a strong, solid casting may not result. For convenience the reservoir of molten metal should be the feeders, namely the gates,

the runner, and the sprue, all of which`should be of sufcient size and of proper shape to remain liquid and to supply metal to rell all the casting mold cavities las the metal therein pro--4 gressively shrinks in solidifying and cooling.V In order to' maintain all these feeders in a liquid condition, theoretically their surfaces, which 'adiate heat, should be kept to a minimum. Their cross sections should, therefore, be circular, but

since it is inconvenient to make these feeders precisely cylindrical while making them large enough, at least their corners should be rounded as indicated in the runner cavity I 5' of Fig. 8. The heat radiation of any such feeder will be greatly increased, which will correspondingly increase its cooling rate and hasten solidirlcation,

by the formation thereon of a iin between'the parting surfaces of adjoining mold sections.

Such fins frequently occur on the runner and gates which are` almost invariably located at the parting surfaces. The crevice in the seam formed bythe junction of the parting surfaces along these feeders, as shown in Fig. 20,.I have-found can be sealed by the provision of a sealing ridge 3 as shown in Fig. 9. Such ridge is produced by forming a groove 3 along the sides ofthe patterns for the feeders, such, as the gate pattern strip G and the runner pattern strip I5.

In the preferred construction, the groove 3' for the gate pattern strip G is formed directly inthe pattern plate I0, on whichsuch strip is lmounted, depressed below the surface of such pattern plate. A marginal 'groove 3 may be formed along the runner pattern strip I5 between each side thereof Vand the adjacent edgeof a pattern plate merely by making thelongitudinal edges of center plate II of a thickness slightly less than the thickness of the abutting pattern plate- I0 or I0'. The action of the sealing ridges 3 is illustrated in Figs. 9 and l0, the former figure showing the cope and drag mold sections C and D, respectively, just prior to engagement of their parting surfaces, whileFigf-lO shows the same portions of the cope and drag sections after their parting surfaces have been pressed into engagement. `Each groove 3' may advantageously be approximately one sixtenthof an inch in Width and three thousandths of an inch in depth, so that the sealing ridges 3 will be approximately one sixteenth of an inch in width andvthree thousandths of an inch -in height. The mold material is preferably of a crushable nature such, for exy ample, as of gypsum base, so that when the parting surfaces are pressed together, the sealing ridges will be engaged before the remainder of the parting surface comes into contact, and their crests will be forced inward'anddeformed until they lie-substantially in the plane of the parting surfaces. This operation will produce a cornpression of the mold material about the bases of the sealing ridges, as well as-of the ridges themselves, whichfsince the ridges are disposed adjacent to the side's of the mold cavities, will effect a tight and dense seal of the seam between the partingsurfaces of the cope and drag sections.

Itis also 'desirable in many instances to pro- 25,-ri'dge 3 for A-th'e-cating cavityis formed l0 4remain liquid. until the metal forming the nii-- 1 5 operation. A representative sample of an unone section of the mold used in the casting operation therefor is illustrated in Figs. 1,4 and l5. Pigs. 1 and 16 show the pattern P by which the *2Q mold section or ma. 14 and is u formed., I n A the pattern plate il, encircling the pattern P.

or in the inserted pattern block, as shown in Fil. 16, is provided a marginal sealing Cri intheformofagroovel'bywhichthesealit on mold. In Pls. 14 ther es 3 along the sides of the gate cavity G.

A comparison of the engagement of the, sealing ridges and the engagement of conventional part- 3,0 ing surfaces adjacent to a mold cavity is illu-- tratedinthecontrastoi'll'igs.17andl8withl!lgi. 19and20,theseilguresbeingmuchenlarged. A

.ofmetaltoowhetwe'enthepartingsurfm 4l! andtherebypmducingann. On'ths'otherhand. eventhoughthepartingmfacesofasalingrldges I'ofllg.1'lmayformanarcuateiunctionwith .theadiacentsidesofthemoldcavitn L arepressedtogetbenasahcwnlnllll,

, rizkes A 60 thecrushablematerialwillhedeformedand-forced r laterallytoilllupanycrevice'atthaiimeticn 'iiowingintothecavityhasnomatrix c3 tactingpartingmrfaeeaof -iofashapetoformiesealingridgeofllL cavity for a casting is formed entirely in `mold section, the' other section` having Tan unbroken parting surface extending on both sides of the sealing ridge, as .indicated by the broken iinemovingcfng.z4.asingleriuseissumeient. l Itismerelynecessarythatthemateriai of the sealing ridge or ridges. when crushed, fill any' crevice between the parting surfaces of the mold sections and pack suiilciently'tightl at their Junction to prevent any metal flowing from 19 inoldcavityoutwardbetweenthem.

Especially when the parting surfaces of both` the cope and drag mold sections are provided with mutually engageahie sealing'ridges, it is exnamely desirable that :ne mold sections be so l! disposed in registry prior-.to their assembly that therewiil be no lateral movement of the parting surfaces andridges at the time of their contact. causing rubbing whichwould'tend to fracture perhaps meer en mio me mold cavity a $0 portion of the ridge material, which would cori-y ',taminate the metal poured into the mold cavity.

Borne provision should. therefore; be made te confine the mold sections to strictly linear movementastheir-partingsurface-.sapproacheachiliiA purpose I provide mold section eiements on each mold section such, for example.

.i si i E e tire the nask rim proper remote from the base plate should be wider and deeper'than the groove 22 in the block 2|, but should be in alignment with such groove. When located in proper lateral relationship by the blocks 2| fitted within its grooves the flask rim 2 may be secured permanently to the base plate l by any suitable means. As is evident from Fig. 1, the pattern plates I0 or I0' may be removed from or inserted into the matchA plate assembly without removing the ilask ring or disturbing the location of the blocks 2l which are secured to the marginal plates l2.

As my invention, I claim:

l. In a mold form for use in making amold for casting, a pattern having a portion for forming a mold cavity wall, a second portion adjacent to'said rst portion for forming a mold parting surface, and a portion intermediate said first and mold cavity wall; a

mold section prior second portions and depressed below the adjoin ing part of said second portion, for forming a" slight ridge upstanding above the adjoining mold parting surface for initial contact with another to contact therewith of such parting surface.

2. In a -mold form for use in making a mold for casting. comprising a portion for forming a planar portion adjacent to said first portion for forming a planar mold parting surface, and an intermediate portion joining said rst two portions and defining a groove therebetween of generally triangular transverse shape, the groove wall next to the rst portion being substantially perpendicular to the planary portion, and its other wall sloping from the bdttom of such perpendicular wall upward face pattern,

thereto, for

to the planar portion for forming a above the adjoining mold parting surface for -initial contact with another mold section prior to contact therewith of such parting surface.

3. In a mold form for use in making a mold for casting, a feeder pattern, a parting surface vpattern adjacent to both sides of said feeder pattern, and a sealing ridge'pattern between each side of said feeder pattern and said parting surand defining a marginal groove along each side of said feeder pattern having its ,bottom depressed below the adjacent part of said parting surface pattern, for forming a slight ridge upstanding abovethe adjacent mold parting surface for initial contact with another mold section prior to contact therewith of such parting surface.-

4. A mold form, comprising a base plate, a center member secured thereon including a runner pattern of a width slightly less than the base portion of said center member, and extending lengthwise to define a marginal baseledge of said center member alongside the runner pattern, and a parting surface pattern plate secured on said base plate with an edge abutting the base of.

said center member adjacent its ledge,l and projecting groove between the abutting edge of the pattern plate and the side of the runner pattern adjacent forming a slight ridge upstanding above the adjoining mold parting surface for initial contact with another. mold section prior to contact therewith of such parting surface.

HENRY F'. HAGEMEYER.

slight ridge upstanding slightly above such ledge to define a

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