US1803301A - Mold - Google Patents

Description

April 28, 1931. E. G. FAHLMAN MOLD Filed July 12, 1929 s Sheets-Sheet 1 IIIWENTOR d ATTORW April 28, 1931. E. G. FAHI..MAN 1,803,301

MOLD

Filed July 12, 1929 3 Sheets-Sheet 2 fiiilliiam BY ATTORNW Apr i1 28, 1931. E, 'G. FAHLMAN MOLD 5 Sheets-Sheet s Filed July -l2 1929 INVENTOR ATTORNEYS Patented' Apr. 28, 1931 I I v ED STATES m'ri-zu'r OFFICE EVERETT G. FA-HLMA N, OF CLEVELAND, QHIO, ASSIGNOR TO THE PERHOLD comm,

. F CLEVELAND, OHIO, A. CORPORATION OF- OHIO atom) Application filcd luly 12,

mold are permanent mold members but in which a-sand core is employed for forming the interior of the casting. A

A further object of the invent-ion is to provide a mold having permanent mold members conforming to the exterior of the casting and provided with means for supporting and accurately'positioning a sand core which conforms "to'the interior of the casting.

A further object is to provide a mold of go the character above described which can be quickly and easily assembledfor pourm and from which thecasting can'be quickly reed.

With the above and other ob ects in view, the invention can be said to comprise the device as illustrated in the accompanying drawing hereafter described and part1cularly set forth in the'appended claims, together with such variations and modifications thereof as will be apparent to one sk1ll ed n the art to which the invention appertalns.

Referenceshould be-had to the accompanying drawings forming a part of these specifications in which:

Figure 1 is a side elevatlon of a mold embodying the invention Fig. 2 is a central vertical section through the mold shown as in Fig. 1. p I c a Fig. 3 is a f ntary section show ng the mold in inverted or ouring position; v

Fig. 4 is an end e evation of the mold; Fig. 5 is. a section taken on the line lat 55 in Fig. 3., Referring to the accompanying drawings,

the moLd. of the present invention is provided with an elongated base member 1 which has axially alined trunnions 2 at its opposite ends which are journaled-in the upper ends of suitable supporting standards 3. The base memberis rotatable to invert the mold, which is carried thereon, the supporting-face of the a with diametrically ,jecting flange 10 which is secured by the bolts 1929. Serial No. 377,631.

base member is one position being above the pivotal axis and in the other position below the p1votal axis. One of the trunnions 2 pro ects through the standard in which it is ourna led and has attached thereto a collar 4 outslde the standard, which is provided opposite-notches 5 which receive a latch 6 pivotally connected to the standard to swing about a pivot 7. The latch- 6 serves to lock the base member with the mold in upright position upon the top of the base member, or in the inverted position in a which the mold projects downwardly beneath the base member. l

The base member is provided with a central boss 8, which has an opening to receive a bushing 9 which projectsa short distance above the top face of the base member and which has at its lower end an outwardly pro- 11 to the boss 8. At its upper end the bushmg 9 has a counterbore which forms an annular shoulder 12 within which a sand core 13 is adapted to fit, the recess in the bushing 9 providing a support for the sand core and accurately centers the oore with respect to the'mold. .The' sand core 13 as herein inns-- trated conforms to the interior of a piston and is provided withlateral recesses 14 in which thewrist pin bosses are formed.

The external'wall of the mold cavity is formed by two complemental mold sections 15, which are identical in size and shape ;-the two. mold sections are mounted on the base member on opposite sides of the core supporting bushing for movement toward andaway from the bushing, the mold sections being provided on their bottom faces with grooves 16 which fit over'longitudinally' extending ribs 17 formed on the base member.

Along the bases thereof, the mold sections are providedwith flanges 18 which extend outwardly nearly to the side edges of the base member and. slide beneath the flanges .19 of the angle guide bars 20, bolted or otherwise rigidly secured to the side edgesQof the base member. ,Accurate alinement of the mold sections is maintained by the guide ribs 17 and the mold sections are supported when the xii] base member is inverted by means of the flanges 19.

The mold members are provided with inner fiat faces which abut in the axial lane of the core member normal to the line 0 movement of the mold members and these abutting faces are provided with registering semi-cylindrical recesses 21 which receive the core member and form the exterior wall of the mold cavity. Each of the mold members is provided, adjacent its abutting face, with lateral extensions 22 which project laterally beyond an edge of the base member and which are provided with registering sprue cavity grooves 23 which extend diagonally from the outer end portion of the extension to the recesses 21. The inner end portions of the grooves are made shallower and wider, so as to provide a narrow elongated gate opening into the casting cavity. I

When the mold members are held in engagement with each other the grooves 23 form a sprue cavity for conducting molten metal to the interior of the casting cavity. As shown in Fig. 5 of the drawing, the molten metal can be introduced into the mold only when the mold is in inverted position, in which position the passageway formed by the grooves 22 is inclined upwardly and outwardlyfrom the lower end of the casting cavity and the upper end of the passageway is above the upper end of the mold cavity, so that the molten metal will flow into and completely fill the mold cavity, the outer, or pouring end, 24 of the passage being suitably fiared to facilitate the pouring of metal into' the passageway.

The mold members have axially alined core pins 25 slidably mounted therein which proect into the recesses 21 and which are adapted to engage in the recesses 14 of the sand core, the inner ends of the core pins 25 being of the samediameter as the wrist pins, so as to accurately form the wrist-pin bearings in the piston. Each pin is provided with rack teeth 26, which are engaged by pinions 27 on transverse shafts 28, each of which is provided with a handle 29 for turning the shaft to advance or retract the core pin connected therewith.

Each of the mold sections is actuated by means of a toggle composed of an inner extensible link 30 and an outer link 31 connected to the inner link by means of a toggle pivot 32. Each of the toggles is actuated by means of a lever 33 rigidly attached to the other link 31 and extending upwardly at an angle thereto. By swinging the levers 33 outwardly, the toggle pivots 32 are raised and the mold members are shifted outwardly on the base member, and by moving the levers in the opposite direction the mold members may be moved into engagement with each other.

The inner limit of movement of each mold member may be adjusted by lengthening or shortening the link 30, and to prevent the movement of the toggle pivot past dead center position adjustable stop screws 34 are provided, which may be raised or lowered to limit the movement of the toggle pins. The stop screws 3 1 provide a fine adjustment by -which the inward movement of each mold member may be accurately limited to the exact central plane of the core member.

In assembling the mold, the base member is adjusted to the position shown in Fig. 1 with the mold members in upright position on the upper face thereof. While the mold members are separated as shown in Fig. 1, a sand core is placed in the recess in the upper end of the bushing 9 and the levers 33 are swung inwardly to move the mold sections 15 into engagement with each other over the sand core. Core pins 25 are then moved inwardly into engagement in the recesses 14 of the sand core, whereupon the latch 6 is released and the base members rotated to invert the mold, bringing the mold to the position shown in Fig. 5 with the gate and sprue-forming cavity in position to receive the molten metal, the core pins 25 serving to hold the sand core against movement when the mold is inverted.

After the mold cavity has been filled with molten metal and this metal has sufficiently solidified, the mold members 15 may be moved by first releasing the core pins 25 and then shifting the mold members outwardly toward the ends of the base member, leaving the casting with the sand core therein free of the mold members.

It will be apparent that the present invention provides a mold of simple construction which may be employed for casting hollow articles of intricate interior formation; that the mold may be quickly and easily assembled for pouring and quickly released from the casting.

Furthermore, it is to be understood that the particular form of apparatus shown and described, and the particular procedure set forth, are presented for purposes of explanation and illustration and that various modifications of said apparatus and procedure can be made without departing from my invention as defined in the appended claims.

What I claim is:

1. In a permanent mold adapted for casting substantially cup-shaped articles from aluminum alloys and the like,in combination, a mold base, a plurality of separable mold sections, means for guiding said mold sections into and out of predetermined molding position on said mold base, said mold sections having complemental recesses in their inner faces forming a substantially cupshaped casting cavity opening downwardly, said mold base being recessed to receive a core, a frangible core arranged to be disposed in said mold base recess and shaped to fit snugly therein whereby said core may be disposed accurately in predetermined molding position, said core having lateral recesses therein, and core pins carried by said mold sections arranged to cooperate with said core recesses and prevent movement of said core axially of the cup-shaped casting cavity, whereby cup-shaped castings of accurate dimension readily may be formed.

2. In a permanent mold for casting substantially cup-shaped articles from metal having a relatively high crystallization shrinkage and a relatively low freezing point. in combination, a support, a plurality of separable mold sections, means for guiding said mold sections into and out of predetermined molding position on said support, said mold sections having complemental recesses in their inner faces forming a substantially cup-shaped casting cavity opening downwardly, said mold base being recessed to receive a frangible core, a frangible core disposed in said recess in predetermined molding position, said core having lateral recesses therein, and means carried by said mold sections arranged to extend into said core recesses and prevent movement of said frangible core axially of the cup-shaped casting cavity, said mold base being mounted for rotative movement whereby the casting operation may be accomplished with the mold in a position in which the casting cavity may be readily filled with casting metal to form sound castings.

In testimony whereof I aflix my signature.

EVERETT G. FAHLMAN.

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