US1542640A - Permanent casting mold - Google Patents

Description

C. D. PETTIS PERMANENT CASTING MOLD June 16, 1925.

5 Sheets-Sheet 1 Filed Nov. 5, 1924 June 16, 1925. 1,542,640

6. D. PETTIS PERMANENT CAS TI NG MOLD Filed Nov. 5, 1924 3 Sheets-Sheet 2 1,542,640 0. D. PETTIS PERMANENT G55 TI NG MOLD June 16, 1925.

Filed NOW 24 5 Sheets-Sheet 3 l l 1 I i I J tral base lug 15.

Patented June 16, 1925.

UNITED STATES CLIFTON 1). runs, or NEW YORK, N. Y.

PERMANENT CASTING MOLD.

Application filed November 3, 1924. Serial no. 747,481.

To all/whom it may concern:

Be it known that I, CLIFTON D. PETTIS, a citizen of the United States, and a resident of the city of New York, and State of New York, have invented certain new and useful Improvements in Permanent Casting Molds.

The invention relates to repetition molds or so-called permanent molds for casting iron and other high melting oint metals and seeks to provide a mold 0 simple, durable construction which can be readily and rapidly operated and which is more particularly adapted for cast iron valve cock casings, pipe fittings and like articles, although its utility is not limited in this respect. The invention consists in the features of improvement hereinafter set forth, illustrated in the preferred form in the accompanying drawings and more particularly pointed out in the appended claims.

In the drawings Figure L is a vertical section of the improved mold taken on the parting line between the mold members;

Fig. 2 is a side elevation-of the mold;

Fig. 3 is. an end elevation;

Fig. 4 is across section on the line 4-4 of Fig. 2;

Fig. 5 is a detailed horizontal section on the line 55 of Fig. 1; and

Fig. 6 is a detailed vertical section on line 6-6 of Fig. 1.

The mold consists of two chambered or hollow members preferably formed of cast iron, each consisting of an inner wall formed of sections 10 and a box-like receptacle having exposed or outer side and edge walls 11 and 12. Each receptacle has integral lugs-or arms 13, preferably three in number, depending from its lower edge wall and the lugs or arms of-both receptacles engage a common horizontal pivot pin 14 that is mounted in upstanding lugs 15 on a supporting base 16-. .As shown in Fig. 2, the end arms 18 are arranged in overlapping contact with the outer arms engaging the inner faces of theend lugs 15 on the base, and the center arms 13 are arranged on opposite sides ofand in contact with the centhus arranged to swing about a common horizontal axis below them and in line with their parting plane and are accurately guided and properly centered'in closed position. In open position the moldmembers are outward y inclined and, when the mold The mold members are is closed, the members are in vertical position. In Fig. 4 one of the mold members is shown in its closed position and the other in its open position. To arrest the closing movement of the mold .members and accurately position the same in closed position, the receptacles 10 are provided on their ends with projecting lugs 17 which contact with fixed stop arms or posts 18 projecting upwardly from the lugs 15 of the base.

The outer. wall 11 of each receptacle is provided with a pair of into ral forkshaped projections arranged a jacent its ends and having up r and lower arms 19, the inner parallel aces of which are engaged by a pair of circular cams or eccentrics 20. The latter are'mounted on arms 21 and these arms are connected by pivot pins 22 to lugs 23 that project upwardly from the outer side edges of the base 16. Preferably the arms 21 constitute the end members of a bail having a horizontal men1-,

ber 24 and in the particular. construction shown the horizontal member 24 and the arms 21 of the bail are cast integral with the circular cams or eccentrics 20. Each bail, as shown most clearly in Fig. 2, fits between the upper, ends of the uprights 23 on the base and the pivot pins 22 are journaled in the upper ends of these uprights and are threaded into openings formed in the lower portions of the bail arms 21. The horizontal member 24 of each bail is provided with a central socket in which is fixed a handle 25 for swinging the cams upon the pivot pins 22. Obviously, as thecams are rocked upon the pivot pins, they will cooperate. with the upper arms 19 of the mold members to move the latter to closed position and with the lower arms 19 to open the molds. As the cams are swung to close the molds, the cams move toward a dead center position vertically above their pivots so that they serve not only to open and close the molds but also to lock them in closed position. Preferably, as shown in Fig. 3, the arrangement is, such that, in the closed position of the mold members, the cams have not quite reached their dead center position and hence can be employed to force the meetingfaces of the mold members into snug engagement and also to take up wear between the contacting surfaces of the cams andlugs or arms. It is noted that the pivotal axes about which the cams swing lie outside ofthe peripheries of the cams the receptacles and in effect constitute the inner walls of the hollow mold members. The sections 10 are of substantially uniform thickness but are preferably somewhat thicker than the receptacle walls 11 and 12. Preferably also the sections 10 overlap the inner edges of the receptacles and are removably fastened by machine screws 26 to thickened flush flanges '27- and lugs 28 formed on the inner edges of the receptacles.

The mold sections 10 of each member are. arranged in a series extending lengthwise of the member and are spaced apart to form very narrow slits 29 between the adjacent edges of the sections and extending transversely of the mold member and vertically in the construction shown. These slits communicate with the cavity or cavities of the mold and vent the same, but are so narrow, being preferably only about one one-hundredth of -aninch wide, that they do not permit the passage of the molten metal from the cavity. 7

The particular mold shown is designed for casting an angle cock body having barrel and nozzle portions, and two oppositely arranged matrices or cavities 30 are provided for forming two castings at each operation, one half of each. cavity and of an intermediate vertical sprue 31 being formed by the mold sections or sectionalized inner wall of each member. The mold sections are also provided with core prints 32 for receiving the prints 33 that are formed upon the ends of the arms of substantially cross-shaped cores 34, and theinner or parting faces of the mold sections are provided with shallow grooves 35 leading from the core prints to the edges of the sections, thus providing for the free venting of air and gas from the cores. In the particular construction shown each mold member is provided with five mold sections of different widths, the width of the sections being so chosen that, notwithstanding the irregular and rounded surfaces of the mold cavities, the edge faces of the sections are at right angles to the adjacent surfaces of the mold cavities (see Fig. 5). Hence the mold sections have no thin edges exposed to the molten'metal.

The matrix-forming portions of the mold sections project outwardly into the chambers of the receptacles but are spaced from the walls thereof to permit the expansion and contraction and avoid the warping and distortion of the mold sections. For the same purpose and also to avoid the warping of the receptacles themselves, the walls of the latter are relatively thin and capable of yielding to a slight extent, and preferably the inner portions of the edge walls 12 and the thickened flanges 27 thereof are slitted as indicated at 36 in Figs. 1 and 3. To'permit the ready escape of air and gas from the mold cavities and the dispersion of heat from the portions of the mold members, the exposed outer side wall 11 of each member is provided with numerous openings 37 for the free circulation of air through the receptacle chambers. This provision for the escape of air and gas and the dispersion of heat from the mold members, the sectionalizing of the inner walls thereof, the formation of mold sections, which are for the most part of substantially uniform thickness, the manner of mounting the sections upon the edge walls of the receptacles with the matrix forming portions thereof spaced from the receptacle walls and the described construction of the receptacles, all cooperate in preventing excessive heating and the warping and distortion of the parts of the mold. The mold sections 10, which are of course subjected to the highest heat, should be of such thickness that they will resist distortion, and for the same purpose in the 'particular construction shown, the adjacent .edges of the matrix-forming portions of the end and intermediate sections are provided with stiffening flanges 38. But excessive thickness of the. moldsections 10 should be avoided in order to prevent cracking and distortion due to unequal heating of different portions thereof. In the particular mold shown, when constructed for a cock casing having walls for the most part between one-quarter and one-half inch thick, the walls of the matrix-forming portions of-the sections are preferably one-half or five-eighths of an inch thick and the walls of the receptacles are about onequarter of an inch thick. As a further aid in permitting the expansion'and contraction of the matrixsections and the dissipation of heat therefrom, the portions of these sections which form the core prints and which of course are not exposed to the molten metal, are relatively thinner, being in the present construction about three-eighths of an inch thick.

The sand cores 34 are each preferably formed of two similar halves or sections. When the mold members are openthe sections of the cores can be readily and accurately placed in position with the meeting faces of the core sections in alignment with the matrix-forming the inner or'meeting faces of the mold sec closing the molds the tions. Preferably the prints 33 on the ends of the arms of the cross-shaped cores are of such size that, for the most part, they .form the end faces of the barrel and nozzle portions of the cock casing. By this provision, such end faces of the ,finished casting are not as dense as those formed against the metal surfaces of the mold and together with the interior of the finished casting can be more readily machined. One of. the prints of each core is provided with an opening 39 and these openings communicate with gates 40 leading from the lower end of the sprue'31.

In .the construction shown the upper end of the sprue 31 communicates. with the outlet of a pouring gate formed of two'cast iron sections 41 having flanges 42 through which screws extend for fasteningthe gate sections to thickened portions on the upper edge walls of the mold receptacles. The gate sections project inwardly beyond the edges of the receptacles and overlie certain of the mold sections 10 and have depending portions 43 extending downwardly into engagement with the upper edges of the central mold sections in which the sprue 31 is formed. Preferably the pouring gate is of the type known as a bowl gate, and, as shown, its outlet is provided with a burnt sand strainer 44.

A. pair of fixed posts 45 are fixed to lugs 46 mounted on the base 16 and the upper end portions of these posts are adapted to extend through the parting line of the mold members into the cavities thereof, the lower edges of the mold sectionslO and the halves or sections of the cores 34 having recesses into which the upper end portions of these.

posts extend. Preferably, as shown, the posts are tapered, and the recesses in the mold and core sections are correspondingly shaped. In operation as stated, the core sections are placed in the mold members when the latter are-in open position. On core section's embrace the pins or posts 45, then, when the metal is poured and sufficiently set, the mold members are opened, but the casting or castings (when two are made at the same operation) and the core or cores rema n on the fixed posts or pins'45 and can be conveniently removed therefrom. In this way the finished castings are i readily disengaged from the permanent mold members and indeed are entirely removed from contact with the metal walls of the mold members as soon as the latter are opened. Hence, by quickly opening the mold as soon as the casting is set, excessive hardening or chilling of the casting and overheating of the mold members are avoided. In 0 eration it has been found that using a suita 1e nonchilling iron, castings can be formed in which there is little or no hardening chill due to combined carbon, although the sur-' faces of the castings formed bv'contact with the metal walls of the mold will be quite dense and non-porous. The cores of course protect the posts 45 from contact with the molten metal. It is noted that since the core prints form the portions of the cavity surface that are at right angles to the parting line of the mold members, there is no binding or rubbing between the faces of the casting and the mold members as the latter are opened. Instead, the initial opening movement of the mold members immediately carries the permanent walls of the mold cavity out of contact with the casting. The improvement provides a simple, durable mold which, in its preferred form, nee-d consist of but two parts or members and which can be readily and easily operated for making valve bodies and other hollow castings.

Obvious changes may be made in the details set forth without departure from the essentials of the invention as defined in the claims.

I claim as my invention 1. A permanent mold for iron and like castings comprising two hollow metal members having abutting inner walls provided with matrixportions of substantially uniform thickness spaced from the outer Walls thereof, said hollow members having openings in their outer walls for the circulation of air therethrough and narrow slits dividing the inner walls thereof into separate sections and communicating with the matrix, substantially as described.

2. In a permanent metal -mold for iron and like castings, a base, two mold members,

each member comprising a plurality of metal mold sections and supporting means movably mounted on said base and to which said sections are independently and ,detachably secured, and means for moving the supporting: means and the mold-sections III) of each member as a unit to open and close the mold, said metal mold sections having portions of substantially uniform thickness spaced from the other walls of the mold members and cooperating to form a matrix and said sections being spaced apart to permit the expansion thereof and form narrow venting slits communicating with the matrix.

3, In a permanent metal mold for iron and like castings, a base, two mold members, each member comprising a plurality of metal mold sections arranged side by side in a series extending lengthwise of the mold member and having portions of substantially uniform thickness spaced from the other walls of the mold members and cooperating with one another and with like portions of the mold sections of the other member to form a matrix, and supporting means movprint portions spaced from ably mounted in the base for connecting the sections of each member andto which said sections are secured in spaced relation to permit the expansion thereof and form narrow venting slits communicating with the matrix.

4. A permanent metal mold for iron and like castings comprising two hollow boxlike receptacles having open inner faces and openings in the outer walls thereof for the circulation of air, metal sections detachably secured to the inner edges of each of said members and havingmatrix portions'spaced from the walls of said receptacles, said sections being spaced apart to permit the expansion thereof and form narrow venting slits communicating with the matrix substantially as described.

5. A permanent metal mold for castings comprising hollow members having abutting inner walls provided with matrix and core the outer walls of said members, said hollow members having openings in the outer walls for the circulation of air and the inner walls thereof being divided into separate sections spaced apart to form narrow slits communicating with the matrix, and said sections having venting grooves initheir inner faces leading from the core prints, substantially as described.

6. A permanent metal mold for castings comprising two box-like members, and a plurality of metal sections detachably secured to the inner edges of each of said members and having matrix portions of substantially uniform thickness and relatively thinner core print portions, said matrix and core print portions being spaced from the walls of said members and said sections being spaced apart to permit the expansion thereof, substantially as described.

7. A permanent metal mold for iron and like castings comprising two box-like members having openings in their outer walls for the circulation of air 'thbr'ethrough and open inner sides provided with flush edge flanges, and a plurality of metal-sections overlapping and detachably secured to the inner edge flanges of each of said members and having, matrix portions of substantially uniform thickness, said sections being spaced apart and said edge flanges being slitted, substantially as described.

8. A permanent metal mold for iron and like castings comprising hollow box-like members having open inner faces, anda plurality of metal sections detachably secured to the inner edges of each of said members and having matrix portions of substantially uniform thickness spaced from the walls of said members, substantially as described.

9. A permanent metal mold for iron and ing flanges at their edges,

and a plurality of.

like castings comprising hollow box-like members having open inner faces, and a plurality of metal sect-ions detachably secured to the inner edges of each of said members and having portions of substantially uniform thickness cooperating to form a mold matrix, certain of the matrix forming portions of said sections having stiffensubstantially as described.

10. A permanent metal mold for iron and like castings comprising two hollow boxlike members having open inner faces, and a plurality of metal matrix sections detachably secured to the inner edges of each of said members, with venting slits for the matrix between the adjacent edges of said sections, the walls of saidmembers being relatively thinner than said matrix sections and having openings for the circulation of air, substantially as described.

11; A' permanent metal moldfor cast iron valve bodies and likehollow castings comprisin two box-like members having open inner faces and openings in their outer walls for the circulation of air, and a plurality of matrix sections detachably secured to the inner edges of each of said members and venting slits for the matrix between the adjacent edge faces of said sections, said edge faces being at right angles to the adjacent portions of the matrix surfaces, substantially as described.

12. In a mold for casting a valve body having a barrel. and nozzle portions, the combination of box-like metal members having abutting inner walls and core print portions, and a substan tially cross-shaped sand core having prints at the ends of its arms'that form, at least in part, the end faces of the barrel and nozzle portions of the valve body, substantially as described.

13. In a mold for casting a valve bodyhaving a-barrel and nozzle portions, the

combinationof two hollow metal members having abutting inner walls provided with matrix and core print portions, and a substantially cross-shaped, two-part core having prints at the ends of its arms and meeting faces coinciding with the meeting faces of said inner walls, substantially as described.

14. In a mold for casting hollow bodies,

' the combination of a base, two hollow metal members having abutting inner walls provided with matrix and core print portions, said members being pivotally mounted on said base and having vertical closed positions and oppositely clined open positions, a two-part core having meeting faces coinciding with the meeting faces of said inner walls, and means for moving said members to open and close the mold.

provided with matrix.

and outwardly inthe valve body, substantially as described.

16. In a mold for casting hollow articles, the combination of pivotally mounted per- 'manent mold memberseach movable to and position, a core having an and" a post projecting from closed opening therein, through the parting line of said members and having its axis intersectingthe axis" of the pivotal mounting, said jecting into theopening in said 'core, stantially as described.

.17 In a permanent mold for casting hollowarticles, the combination of a base, two mold members pivotally mounted on a common horizontal axis on said'base, a core for the mold having an opening therein and a post mounted, on said base and adapted to project between said members, when the latter are closed, and extend into the opening in said core, said post having its axis intersecting said common hor1- zontal axis, substantially as described. 18. In'a permanent moldfor casting hollow articles, the combination of a base, two moldmembers mounted thereon to. move to and from closed position, means on said base for opening and closing said members and for locking the samein closed position, a post projecting upwardly from said base, and a two-part core for the mold, one or both of the meeting faces of the members and the two-part core having recesses through which the post extends when the mold is closed, substantially as described.

post prosub- 19. In a permanent mold for casting valve bodies, the combination of a base, two boxlike metallmembers pivoted on said 1 base from a vertical closedposition, the inner abutting walls of said memhere having portions forming two mold cavities, a sprue leading to the cavities and the mold cavities hav ing openings therein, two posts on the. base.

core prints, cores for projecting upwardly between the mold members and adapted to extend into the' openings in the cores, and means on the base for moving said members between their openand closed positions, substantially as described.

20,111 a" permanent casting mold, the combination of a base, two mold members horizontally pivoted at their lower portions fon'said base to swingto and. from a verti-' circulation of air cal closed position about a substantially horizontal pivot, means on said base for moving said members to open and close the mold, and meanson said base for supporting the finished casting independently of the mold members when the latter are opened, said means having its longitudinal axis intersecting the axis of said pivot, substantially as described.

21. In a permanent casting mold, the combination of abase, two mold members pivotally connected to said base to swin to and from a vertical closed position a but a common horizontal axis arranged below and in line with 'their parting surfaces, means on said base for moving said members to open and close the mold and an upright on said base with its axis intersecting the said horizontal axis and arranged to project through the parting line of said members into the mold-cavity for removing the casting from both of said members as the latter are opened, substantially as described.

22. The combination in a permanent casting moldfor iron and like castings, of two mold members each comprising a support and a plurality of metal mold sections mounted thereon side by side in a longitudinal series, said sections forming the arting surfaces of the mold members and aving portions of substantially uniform thickness spaced from the other walls of the members and forming the mold cavity, and said sections being independently and de- 100 tachably fixed to said supports in spaced relation to permit the expansion thereof and forming a series of narrow, transverse venting slits forthe mold cavity, a base whereon said supports are ivotally mounted and 105 means'on said base or moving said members'to open and close the mold, substantially as described.

23. A permanent metal mold for iron and like casting comprising two relatively mov- 110 able, hollow, box-like members having openings in their outer walls for the circulation of air therethrough, each of said members comprising a plurality of metal mold sections forming the parting surface thereof 115 andhaving matrix portions of substantially uniform thickness spaced from the other walls of the mold member and a support to which said sections are independently and detachably secured in a longitudinal series 12 and in spaced relation to permit the expansion thereof and the venting of the mold cavity, substantially as described.

24. In a permanent metal mold for iron and like castin s, the combination of a base, two hollow, ox-like members pivotally mounted on said base to swing to and from a vertical closed position, said members having openings in their outer walls for the therethrough and having abutting inner walls provided with matrix portions spaced from the other Walls of said members and sectionalized for venting and expansion, means for moving said members to open and close the mold and means projecting through the parting line of said members for removing the casting from both members as the latter are opened, substantially as described.

25. A permanent casting mold for valve bodies and like castings having curved ex ternal surfaces, comprising two hollow metal members having abutting inner Walls provided with portions forming. a mold cavity, each of said walls being divided into a plurality of separate sections with narrow venting slits for the mold cavity between the adjacent edge faces of said edge sections, said edge faces being at right angles to the adjacent surfaces of the mold cavity, substant-ially as described.

26. In a permanent two part mold for casting a valve body having barrel and nozzle portions, the combination of a base, two hollow, box-like members pivotally mounted on said base to open and close the mold, said members having openings in their outer walls for the circulation of air therethrough and having abutting inner walls provided with matrix and core print portions spaced from the other walls of said members and sectionalized for venting and expansion, and a substantially cross shape sand. core having prints at the ends of its arms forming the end faces of the barrel and nozzle portions of the valve body, substantially as described.

27. In a permanent mold for hollow castings, two relatively movable members having abutting walls provided with cavity forming portions, and a core supported within the cavity and having molding sur faces for forming the portions of the cavity molding faces that are disposed at right angles to the parting surfaces of the mold members, to thereby relieve the casting from undue sliding contact with the movable members during opening movement thereof, substantially as described.

28. In a permanent two-part casting mold for valve bodies and like hollow castings, the combination of two hollow members pivotally mounted to open and close the mold and having abutting inner walls provided with cavityand core print portions and a' core mounted within the mold cavity and 1 having prints forming the portions of the cavity surface that are disposed at right angles to the parting faces of bers, substantially as described.

29. In a permanent two part mold for hollow castings, a base,'two mold members pivotally mounted on said base to swing to and from a vertical closed position and forming the mold cavity, a core supported the mold mem-" within the cavity and having prints form ing the portions of the cavity surface that surfaces of the mold members, an upright on said base projecting between the parting surfaces of the mold members and arranged to engage said core for supporting the latter and the casting independently of the members as the latter are opened, substantially as described.

30. In combination in a permanent casting mold, a base, two hollow mold members pivotally mounted thereon and having abutting inner walls divided with cavity forming and core printing portions and sectionalized for venting and expansion, a core supported in the mold cavity, means for moving said members to open and close the mold and a part mounted on the base and extending through the parting line of the mold members to engage the core and sup port the same and the casting independently of the mold members as the latter are opened, substantially as described.

31. Aipermanent mold for castings, comprising a plurality of hollow metal members all movable about axes extending in the same direction and having abutting innor walls provided with matrix portions spaced from the outer walls thereof, said hollow members having openings in their outer walls for the circulation of air therethrough, and narrow slits dividing the inner walls thereof into separate sections and communicating with the matrix, substantially as described.

32. In a permanent metal mold, a base, a plurality of mold members movable about a common axis onsuch base, said members comprising a plurality of mold sections forming a complete matrix and supporting means to which the sections are independently and detachably secured, and means for moving the supporting means to open and close'the mold, said mold sections being spaced to permit expansion thereof and form narrow venting slits, substantially as described.

33. A permanent metal mold for castings, comprising hollow members with abutting inner walls provided with a matrix and a core print portion spaced from the outer walls of said members, said hollow members having openings in their outer walls for the circulation of air and the inner walls being ivided into separate sections spaced apart to form slits communicating with the matrix, at least one of said sections havinga venting groove in its inner face leading from the core print, substantially as ,described,

34. A permanent metal mold, comprising a plurality of box-like members, and a plurality of metal sections detachably secured to each of said members and having matrix portions with a relativel thinner core print portion, said matrix and core print portion being spaced from the walls of said members and said sections being spaced apart to permit the expansion thereof, substantially as described.

35. A permanent metal mold for castings, comprising hollow box-like members all movable about a common axis and having open inner faces, and a plurality of metal sections detachably secured to each of said members, said sections being spaced from the walls of said members and cooperating to form a common matrix, substantially as described.

36. A permanent metal mold, comprising a plurality of spaced matrix-forming sections forming a matrix of irregular longitudinal contour, said sections having edges substantially normal to the portion of the matrix face at the point of intersection, substantially as described.

CLIFTON D. PETTIS.

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