Патент USA US2127204код для вставки
Aug. 16, 1938. 2,127,204 D. J. CAMPBELL MOLD 5 Sheets-Sheet 1 Filed May 20, 1955 l BY C mi?JWMA p . 0 0 wm.R 5% M m: Aug. 16, 1938. 2,127,204 D. J. CAMPBELL MOLD 5 Sheets-Sheet 2 Filed May 20, 1935 Q3 1.9%’? ‘ 3‘I // V /W' I\\.A 0T u6 /v m\H‘V’f/l' i 51/A“mi W 7 /w M M. 8 A , M m i 7w m x yw a p 7. \ l”// l a / B Rg m ,17\ AM~4/0 .HT V a 6 .' 5 T! ,g/Wwofmfm Vm.m“wM ‘0 Mu J. N M“ Aug. 16, 1938. D. J. CAMPBELL 2,127,204 MOLD Filed May 20, 1955 5 Sheets-Sheet 4 @ INVENTOR Bony J (bu/9,951.1. ' Qz/ w A TTORNEY Aug. 16, 1938. 2,127,204 D. J. CAMPBELL MOLD Filed May 20, 1935 5 Sheets-Sheet 5 /27 ( :22‘ 25 INVENTOR P". ~ - . m BY _ DONALD J (594466221. o?mwgwlcm A TTORNEY Patented Aug. 16, 1938 2,127,204 ‘ UNITED STATES PATENT OFFICE 2,127,204 MOLD Donald J. Campbell, Spring Lake Township, Ot tawa County, Mich., assignor to Campbell, Wyant & Cannon Foundry Company, Muske gon, Mich., a corporation of Michigan Application May 20, 1935, Serial N0. 22,286 5 Claims. (Cl. 22—96) This invention relates to metal founding, and the inner side and at spaced‘apart points ad is more particularly concerned with a method of jacent the sides, pins 3 extend the full height of producing molds for the casting of metal articles the ?ask, being provided with shoulders or collars and which may be used for a great variety of 4 thereon between their ends which bear upon articles, but which is particularly useful in con integral shoulders 5 cast with and extending in- 5 nection with the casting of crank shafts for in wardly from the sides of the ?ask. ternal combustion engines. Other elongated ar A pattern plate 6 is designed to be located at ticles, such as cam shafts for internal combustion the lower side of the ?ask. The plate is reinforced engines, or other elongated shafts of irregular and supported by ribs 1 at its lower side, termi shape may be readily produced by use of the nating at their lower ends in horizontal ?anges 8 10 method for producing the molds therefor which forming supporting pads which in practice rest I have devised, and which may be fully understood upon the platen of a molding machine. At the from the following description, taken in connec upper side of the pattern plate 6 the patterns 9, tion with the accompanying drawings, in which, in this case two identical patterns, are located Fig. 1 is a plan view of a ?ask with the pattern and permanently secured. 15 16 plate and a reinforcing mold grid or arbor assem A reinforcing arbor for the mold is adapted to bled ready for the reception of the molding sand. be located within the ?ask. It is in the form Fig. 2 is a transverse vertical section through substantially of a rectangular open grid having the ?ask, the pattern plate and arbor, and with parallel sides and intermediate parallel bars II], 20 the bottom plate applied and detachably con with parallel ends and cross bars H (see Fig. 8) .20 nected thereto, as is done after the ?ask has been thus forming an open grid which may be inserted ?lled with sand. downwardly into the ?ask as shown in Fig. 2. Fig. 3 is a similar section of the bottom plate. The undersides of the intermediate portions of Figs. 4 and 5 are like sections of the reinforcing 25 ?ask arbor and of the ?ask, respectively. Fig. 6 is a similar section of the pattern plate shown located within and surrounded by the sub platen of a molding machine. Fig. 7 is a side elevation of the reinforcing arbor. Fig. 8 is a plan View thereof. Fig. 9 is a plan of a mold section after. the same has been produced. Fig. 10 is an elevation of a crank shaft, two of which are produced in the mold shown. Fig. 11 is a horizontal section through a com 35 plete mold for a crank shaft, the same consisting of two mold sections placed together and secured in ?xed relation to each other. Fig. 12 is an elevation of the complete mold 40 shown in Fig. 11 associated with which at the upper end thereof, and being shown in section, are the gate member and pouring basin which are superimposed above the upper end of the com pleted mold. Fig. 13 is a plan view of the pouring basin. 45 Fig. 14 is a central section therethrough, and Fig. 15 is an underplan view of the gate mem ber. ' Like reference characters refer to like parts in 50 the different ?gures of the drawings. As illustrated in the drawings, the ?ask I has the grid bars l0 and H may be cut away as at l2 so as to afford proper space for the reception 25 of the pattern. Pins l3 extend downwardly from the grid at its corners also midway between its sides and lugs l4, cast integral with the outer sides H) of the grid, extend outwardly and are divided so as to permit the passage of the pins 3, 30 the lugs resting upon the collars 4. The arbor at its corners and ends has outwardly extending wings I5 as shown to afford further reinforce ment to the mold which is made within the ?ask, the grid being located in the ?ask and retained 35 in the mold after the ?ask is removed. A bottom or strike plate I6 is likewise used, it being of a size to cover the upper end of the ?ask (Fig. 1) and having reinforced and strengthening ribs ll cast integral therewith, and also having 40 outwardly projecting clamp lugs I8 at its side edges to cooperate with similar lugs I 8 on the ?ask over which a detachable clamp l9 may be placed to secure the plate and ?ask together. The bottom plate has many openings or perfora- 45 tions therethrough as shown. In making a mold section the pattern plate is placed on the platen of a molding machine with substantially parallel sides and parallel ends, being slightly tapered outwardly from its bottom the supporting pads or feet 8 resting thereon, and with the plate surrounding by the sub- 50 platen of the molding machine, upon which sub platen the ?ask is placed. The sub-platen of the machine is shown in Figs. 2 and 6 and indicated to its top as shown. At the upper side are shoul 55 ders or ?anges with wear resisting strips 2. At chine. After the ?ask has been located in place 55 at Go. It is a permanent part of a molding ma 2,127,204. on the sub-platen and with the pattern plate located within the sub~platen and resting upon the platen of the molding machine, the open grid passed therethrough. These bolts are provided or arbor is put within the ?ask as shown in Fig. 2. The flask is ?lled with sand, which covers the ers 21 or thin metal plates or bands are located. patterns 9 and completely surrounds all parts of the reinforcing grid or arbor. The molding sand is rammed or jolted to the desired density and any that projects above the plane of the upper edges of the ?ask is struck off, whereupon the bottom plate It is placed on the ?ask over the mold and clamped to the ?ask. There are two ways in which the mold may be removed from the ?ask. One is to remove the whole assembly, consisting of the bottom plate, with heads 26 at one end between which and the adjacent outer side of a mold section wash The threaded ends of the bolts receive thumb nuts 28 between the inner sides of which and the adjacent outer side of the mold sections 29, simi lar washers, plates or bands 2'! are placed. The bolts pass through the spaces made in the lugs 10 [4 as shown in Fig. 2. When the two baked sand mold sections have been thus secured together they are placed in a vertical position on a suitable supporting base as shown in Fig. 12. Over the upper end of the complete mold a gate member 29, of baked core 15 sand, is placed. The gate member has an open the machine, turn the same over so that the ing 30 therethrough and on the underside there bottom plate serves as a support and then draw of from said opening are gates 3! which branch and curve away from each other and are con the patterns from the mold, after which, by un 20 clamping the clamps at I9, the ?ask may be nected by cross gates 32 with openings‘33 made withdrawn from the mold leaving the same with vertically through the gate member, one of which comes directly above each upper feeder cavity the reinforcing arbor therein and resting on the 2lb at the upper end of each of the crank shaft bottom plate. Another and a preferred method mold cavities. , is to draw the patterns downwardly by lower Over the gate section 29 a pouring basin 34, 25 25 ing the platen of the molding machine after‘ also made of core sand, baked in the usual man which the ?ask, the mold therein and the bot ner, is located. The'pouring basin has a well tom plate are turned over, the clamps l9 re moved, and the ?ask drawn upwardly away from 35 into which the metal is poured and from which it ?ows into a shallower portion 36 and over a the mold. skim gate 31 which is disposed'directly above the 30 ?ask pattern, plate and reinforcing arbor, from The mold is made of core sand with a suitable binder therein. After the pattern and ?ask have been removed therefrom it is baked in a bak ing oven thus providing a mold which, in char acteristics, is similar to baked sand cores which 35 are used in molding. In the'manufacture of shafts, such as crank or cam shafts, a part of the mold cavities are made in one mold section such as section 20 (Fig. 9) and another part of the mold cavities in a simi lar mold section. The mold cavities 2i are pro vided by the parts of the pattern on the pattern plate 6 when joined together with the two baked sand mold sections located side by side, as in Fig. 11 provide a complete mold cavity for the 45 shaft. In practice, in order to obviate the effects of shrinkage, as draws and pits which would oc cur from shrinking particularly in elongated arti cles, there may be provided parts 9a and 91) on the pattern to make feeder cavities in the mold, 50 the ?rst being shown in Fig. 1 to feed addi tional metal to heavy parts of a crank shaft where shrinking is liable to occur, and the latter at one end of mold to supply additional molten metal to feed into the upper end of the molten 55 iron which is poured into the mold when the two mold sections are placed together and lo cated vertically, as the same are located for pouring. The mold cavities 2| and the feeder cavities Zia and H2) (Fig. 9) are connected to gether so as to completely ?ll with molten iron upon pouring. The section 20 of the mold made (Fig. 9) when the same has had the ?ask withdrawn there from, has openings 22 transversely therethrough 65 made by the pins 3, collars 4 thereon and the shoulders 5. It is also contemplated that there shall be recesses and projections on the pattern plate ‘so that the mold sections 20 made there are provided with corresponding projections 24 70 and recesses 23, such that when the two mold sections are placed together the projections 23 on the face of one mold section enter the re cesses 24 on the other, thereby properly locating the two mold sections. This will also properly 75 locate the openings 22 so that bolts- 25 may be opening 39 in the gate member, whereby the molten metal, after passing through the skim gate, follows the gates 3| to the openings 32 and thence into the mold cavities. There is also formed in the-pouring basin, directly above each 35 of~the openings 33, a vertical opening 38, the upper end of which is closed by a baked core sand plug 39. ' ' When the molten metal is poured into the well 35 and passes therefrom through the gates to 40 the mold cavities, the air which is displaced by the metal rises into the spaces 38 and slowly passes through the bodies of the mold sections and of the pouring basin, thereby controlling the rate at which the molten iron may pass through 45 the skim gate 31, to the mold cavities. Without the plugs 39 this rate of ?lling the mold cavities would be too fast, but the air trapped in the enclosed spaces 38 and passing therefrom with relative slowness through the body of the pour ing basin operates as a check and furnishes a proper control to the rate of ?ow of the mol ten metal into the mold cavities. It is, of course, to be understood that the molds, like all other 55 molds, are suitably vented so that air and gases can escape therefrom but not at the rate which they would escape if the upper ends of the open ings at 38 were open. The crank shaft 4|] (Fig. 10) produced will have thereon parts, indicated in dotted lines at 49a and 40b, which are cut away to provide the finished casting. These parts, which are cut away, will furnish, when in a molten state, addi tional molten metal to the shaft to compensate 65 for shrinkage and to eliminate draws and pits. Any draws, pitting or other imperfections will be in the parts 40a and 40b which are cut away. As the molten metal reaches the bottoms of the mold cavities ?rst, and as the cavities are ?lled, this metal at the lower end will begin to solidify ?rst and will have its shrinkage taken care of by the molten metal above the solidi?ed portions until the upper end of the mold cavities are reached, whereupon the upper ends of the shaft 75. 2,127,204 portions will be fed from molten metal contained within the cavities 9b. With this method of producing molds the use of a large number of ?asks is not required, as one ?ask is all that is required in making a large number of molds; and duplication of ?asks and patterns will be merely for multiplying produc tion. In fact the only elements which must be duplicated in large numbers are the reinforcing 10 open grills of arbors shown in Figs. 7 and 8. The mold sections will be of a relatively hard consis tency so that the passage of the molten metal in the mold cavities will not act to break loose parts of the mold. The reinforcing arbor in each 15 mold section helps to hold the sand against blow outs from pressure which might otherwise occur. In practical use of this method of producing molds exceptionally satisfactory and consistent results have been obtained. Large and economi cal production is attained, and the shafts or other articles cast are of a homogeneous character free from weaknesses due to pitting, shrinking, blow outs and the like. The invention is de?ned in the appended claims, and is to be limited in no respect other than is required by the terms of said claims. I claim: 1. In the art of molding, a ?ask open at its upper and lower sides provided with inwardly extending shoulder portions at its lower part and at opposed sides thereof, pins mounted in said shoulder portions and extending upwardly above the same to substantially the plane of the upper edge of the ?ask, and an open grille-like arbor having sides and ends and cross members, said arbor at opposite sides having outwardly project ing lugs divided between their sides for the pas sage of the pins therethrough, said arbor being located in the ?ask with the lugs engaged with said pins. 3 2. In the art of molding, a pattern plate with a pattern at the upper side thereof adapted to rest upon the platen of a molding machine with said pattern plate located within the sub-platen of a molding machine and with its upper sides in substantially the same plane as the upper side of the sub-platen, a ?ask open at its upper and lower sides resting on said sub-platen, said ?ask at the inner sides thereof being provided with vertically extending pins, and an open grille-like arbor 10 carried and guided by and extending between the pins and having its upper edges below the upper edges of the ?ask, whereby sand may be placed in the ?ask to ?ll the same and cover the pattern and ?ll the open spaces in and cover said arbor, 15 as speci?ed. 3. In the art of molding, the combination of an open grid-like arbor having sides and ends and cross members, said sides having lugs extending outwardly, integrally formed pins extending from 20 the corners of the arbor and reinforcing means extending alongside of each of the corners to reinforce the same. 4. A grid-like arbor as set forth in claim 3 in which additional pins are provided on oppo~ 25 site sides thereof between the corners and also additional reinforcing members are provided alongside of said pins. 5. In the art of molding, a ?ask open at its upper and lower sides provided with inwardly 30 extending shoulder portions at its lower part and at both ends thereof, a reinforcing arbor, pins mounted on said shoulder portions and extending upwardly, above the same, said arbor at oppo site sides having outwardly projecting lugs cut 35 away to provide for the passage of the said pins therethrough, said arbor being located in the ?ask with the lugs engaged with said pins. DONALD J. CAMPBELL.