US1550663A - Apparatus for making metal molds - Google Patents

Description

1,550,663 W. S. ANDERSON AL I APflm'r-us FOR MAKING METAL uoLps Filed Sept. 2a. 192: s Sheets-Sheet 1 fxrmr L. Hmwusc.

INVENTORJ.

Aug. 25, 1925. 1,550,663

W. S. ANDERSON ET AL I APPARATUS FOR MAKING METAL OLDS Filed Sept. 26. 3 3 Sheets-Shoot 2 0 Ham; 5. Email [Rnrsr L.

' INVENTORS.

-- ATTORNEY;

Aug. 25, 1925.

w. s. ANDERSON ET AL APPARATUS FOR MAKING MBTAL uoLps Filed Sept. 26. 1

3 Sheefcs-Shoot 3 Ear/marl. INVENTORS.

ATTORNEY.

' PatentedAug. 25, 1925..

UNITED STATES wnxrnn s ANDERSON AND ERNEST IL. ASSIGNORS 'ro EARL KOLLEY, or D'msorr, MICHIGAN.

wn'rnnnooss, or DETROIT, momma,

APPARATUS FOR MAKING- METAL HOLDS.

Application ma 'Septeinber 2's, 1923. Serial No. seem.

To all whom it may concern.

Be it known that we, \VAL'rr-Jz S. Ammasex and Enxn'sr L. \Vyrnnnouss, citizens of provements in Apparatus for Making Metal the United States, residing! at 1602 Parkview Ave. and 1163 E. Euclid Ave, Detroit, in the county of \Yayne and State of Michigan, have invented certain new and useful Im- Molds, of which the following is a specification.

This inventionrelates to the art of manufacturing iron castings in permanent molds and its object is to facilitate the manufae-' ture of metal molds generally and sperllieallyof hollow cast iron molds which are made in halves (so as to form two-part. molds) from permanent master metal molds. Such molds have been sueressful.l used in the.manufacture of cast iron carburetors and automobile engine pistons, hut the means shown are obviously adapted for makin; molds for other purposes. These molds are preferably painted with a coating corresponding to that described in the United States patent to Meloche, U. S. 1,453,593. In order to get this coating to adhere to the metal surface the iron mold itself should be solid and free from blow holes and should generally be a sound casting and conform closely to the contour of the master mold. As is well known, the-iron that is cast in aniron mold is denser and is particularly free from hlow holes. it has therefore een found highly desirable to cast the permanent molds themselves in permanent molds.

The molds cast; are of the. general t. 'pe deserihed by Phillips, U. S. Patent .#LHSHL- 997. That is to say, a rib or heading is left around the mold for the purpose of con- .veniently matching the two halves together and giving sharp edges to the mold cavities as described in the Phillips patent.

The outline indicated on the drawings illustrates a mold adapted for use in the production of an automobile carburetor mold. 1 4

Figure l 'shows a cross sectional elevation of the master mold and core in the vertical positionafter pouringwith the matrix of the mold-full ot iron.

Figure 2 shows the. core in elevation.

Figure 1-} shows in elevation the corresponding mold.

Figure. 4- shows the mold and core assembled and clamped together in the horizontal position.

In Figure 1, A is the dry sand sprue, B is a )erforated strainer "ate containing five M oles, C is the mold proper conslsting of a gray iron casting, D is the central projecting portion which corresponds to the contour of a carburetor casting, E is a dry sand core the elevation of which is shown in Figure 2.

F is a perforated iron plate which is clamped onto the mold C by c clamps, one of which is shown in Figure 4. G are the dowels which lot-ate. the core I) onto the mold G. They consist. of pins n'ojcetin; from the mold ll II are the four ejection pins for ejecting the .mold, J is a casting bolted to the mold (l and supporting the ejection mechanism, K is a threaded rod which is free to rotate between the casting J and the mold C, L is a late to which theejection pins II are bolted and to which the rod K is threaded, M is the handle fitted to a squared portion on the end of the thrcaded rml K for operating the ejection device.

In Figure 2, the lateral gates Y Y and the 'vent Z are provided so that the-iron as it is poured into the molds is distributed equally, flows uniformly and is vented thoroughly through the vent Z, this heing, a passage left in the core E for this purpose. The reetan nllar grate Y is arranged so as to he easily lu'olcen oil, the edge. of the. gate Y living east. next to the edge of the. mold t).

In Figure 3. i is the sprue below the. gate it. If is the gate of the negative mold which of course is a convex surface in the positive master mold. Q, and It are the core prints for the negative mold. The master mold G is pivotally mounted on trunions U V in a. stand S (Fig. 4;) and the handle '1 (Fig. 1) is provided fol-conveniently swinging the mold into the horizontal, vertical and inverted position for setting the core, ouring: and ejecting the casting respective y.

In Figure 4, the mold is shown in the as: scnbling position. The cap screws V W :11 provided for the trunions U V so that the mold may he looked in any position. C-clamp X is shown holding the core E and plate F in place so that there will he no danger of displaoiu; the core during the pouring operation. Actually three C-clamps are. required.

Operation-The mold C is mounted on the trunnions U V and casting S. The whole mold C, being. free to rotate, is placed in the horizontal position and locked by the. cap screws \V as shown in Figure 4.

The mold surfaces of C are cleaned and eluted with the coating described in the Ieloche patent referred to above and finally covered with. a coating of freshly deposited lampblack and the mold is thenheated to 500 or 000 F.

The core E is coated with Coopers core paste mixed with blue clay and graphite, the core being, a dry sand core which has been thoroughly baked so that there is no moisture present anywhere during the casting'operatiou.

The ejection pins II are withdrawn so as to be flush withthe mold C. The dry sand core E is then placed on the mold beim. placed carefully in position and located by the dowel pins (l. The perforated plate l" is then placed upon therore l) and three C-elamps (only one shown. Fig. 4) are then used to clamp the plate I" to the mold (l. hese clamps are left in place until the east mold has solidified.

The mold is then rotated no so as to be vertical and the dry sand .-prue and gate A-B is placed opposite. the gate X, as shown in Figure 1. The iron is poured in through AB N Y and it flows info 0, flowing uniformly over the mold l) which is heated thcleby. After the casting ha.= solidified the C clamps are removed. The mold is then rotated another 90 so as to bring the mold in the inverted position with the ejection device H, J, K. L, ll. upwards.

Finally by rotating the handle M the threaded rod Kis' caused to move the plate L out and carry with it the four ejection plus ll thereby e eetmg the negatne mold from the positive nnr tt-r'mold G l).

iv pnurin;, the mold \erligalLY. a greater head is available for ensuring oomph-tr lillin}: of the mold and there is less danger f the. molteuiron prenmlnrel eongealing and so spoiling the perfect reproduction of the contours of the master mold desired.

By using a dry sand core. the iron flows to the mold freely without being prematuretion, the

ly chilled, because although the mold C is heated it still is much lower in temperature than the molten iron. Further, the core is porous and to a certain degree vents the mold.

Obviously the means shown above are adapted for cast ng solid molds, in which case the use oi-a dry sand core projecting into the box C will not be needed.

\Vhat we claim is:

1. Means for manufacturing hollow cast iron molds' from a permanent metal master comprising an open box, a metal master mounted therein, a dry sand core adapted to project into said box and to provide a lateral gate, means for pivotally supporting said mold whereby the core may be located and clamped in place in the horizontal position, the lateral gate rotated into the vertiralplune, the mold poured in the vertical position through the vertical gate, and the east mold ejected from the said box in the inverted position. 4

2. Means for manufacturing hollow cast iron molds from a permanent metal master comprising an open box, a metal master mounted therein, a dry sand core ada )ted to project into said box and to provi e a lateral gate, ejection'means associated with said box, means for pivdt-ally sii'jipbrtin said mold whereby the core ma be locate and clam )ed in place in the horizontal posilateral gate rotated into the vertical plane, the mold poured in the vertical position through the vertical gate, and the cast mold ejected from the said box in the inverted position.

3. Mean for manufacturing cast ironmolds from a permanent metal master, comprising an open box, a metal master therein, means for pivotally supporting said box, gating means for pouring molten metal end- \'a vs into said law a [tor the box lltlg; beenrotatod so as to bring the metal master into the vertical plane. (jet-tin" means associated wilh said box.

In tIJFtHHOHy whereof \ve allix our siguatures."

' WALTER s. .I\NDERSON.-J.:--. mans" L. WATERHOUSE.

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