US 1774426 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
1930- A. M. ERICHSEN 1,774,426
CHILL MOLD FOR CASTING NONIRON METALS Filed Oct. 24, 1928 F/"g. 7. F119. 2.
Patented Aug. 26, 1930 UNITED STATES PATENT; OFFICE CHILL MOLD FOR GASTIN G NONIBON METALS Application filed October 84, 1928, Serial No.
Chill-molds for casting iron containing metals are lmown, the walls of which consist of a nickel-iron-alloy with up to 20% contents of nickel, in order to obtain a soft metal 6 casting and to extendthe durability of the chill-mold. ,1
The present invention relates to chill-molds for casting non-iron metals and their alloys, such as brass, German silver, etc., also pre- 10 cious metals in plates, ingots, or bolts, worked by rolling, pressing, drawing into sheets, bars, wires, etc. According to the present invention, these chill-molds are made entirely or partly of a metal or metal-alloy of inferior heat-conducting-capacity, which latter amounts to only about one third of the heat-' conducting-capacity of cast-iron, or one sixth ofrthe heating-conducting-capacity of softiron. An iron-nickel-alloy containing over 20% nickel, preferably about 35%, is particularly adapted thereto, being by special treatment rendered badly heat-conducting, but
other badly heat-conducting metals and metal-alloys are likewise coming into con- 2 sideration.
As proved by experiments, non-iron metals cast in such molds, solidify considerably slower and more uniform than in ordinary chill-molds.
While the cast-iron surface sinks in the latter during transition into the solidified state and considerable waste is being pro duced thereby, the chill-molds, made in accordance with the present invention of badly heat-conducting metals show the peculiar quality that the casting-compound is not piping during the transition into the solid state as hitherto, but has the tendency to rest at the surface of the casting, or ex and more or less over the casting-surface. asting-waste is hereby reduced to an utmost minimum; Castings of brass, or the like, produced by means of the novel chill-molds show furthermore a lighter colour, having to be traced back to another crystalline composition, it being considerably finer in the castings made by means of the novel chill-molds and showing alsoa finer formation of grains, while the late, quicker solidification of the castings, 50 produced a coarser crystalline structure.
314,762, and in Germany November 2, 1927.
Metal-squirts on the chill-mold-wall do not cool ofl, or at least very slow, and can therefore not form any flaws in the casting.
Consequent to the slower solidification, the gases and oxides have time to escape in an upward direction.
The structure of the casting is therefore favourably influenced by the novel chill-mold for further working into sheets, or the like, pipes or other defects are not formed inside the casting, or flaws on the surface of the same.
The novel chill-mold can, instead of entirely, only partly consist of badly heat-conducting metal, as it may be'of advantage to produce in a thick, or wide. metal-plate of brass a more uniform solidification of the metal thereby, that the plate is in the middle coming into contact with a, better heat-conducting metal than at the sides, in order that the plate may not have the tendency to solidify on the sides quicker than in the middle, whereby the formation of pip'ings might be produced in the middle of the plate. It may likewise be advantageous to provide the upper part of the mold with a badly heat-conducting material in order to keep the runner for a longer time liquid.
The novel chill-mold can also be designed as cooling-mold for continuous, working, whereby the cooling-liquid is supposed to keep the chill-mold possibly permanently at the castin -temperature, or bring the temperature of. the chill-mold after casting again back to the initial temperature. Th1s cooling has however in the new chill-mold hardly any influence upon the solidification, as the radiation of heat is correspondingly retarded by the badly heat-conducting metal between the liquid metal and the cooling-water. Cooling, or re-cooling of the new chill-mold by means of the cooling-medium will naturally be eifected more slowly.
The chill-mold-wall may in its entirety consist of badly-heat-conducting metal, for some purposes, an insulating layer of badly heat-conducting metal will however be sufficient, being placed by squirting-process upon another material, or welded upon another plate.
It, is, of course, to be understood that plates of badly heat-conducting metal can be screwed, or fastened in any other suitable manner to the walls of ordinary known cast iron chill molds.
Two modes of embodying the invention have been illustrated by way of example in the drawing by a cross-section through the chill-mold.
In Fig. 1, a represents the chill-mold of cast-iron, or other suitable metals, made in two parts, being on the whole inner surface provlded with a layer, or plate 6 of badly heat-conducting metal, so that the metal casting a is all around coming into contact with the badly heat-conducting metal. Thel yer, or plate 6 can, as stated, be squirted, welded, screwed or otherwise fastened upon the mold a.
In Fi 2, the arrangement has thus been made, t at the inner surface of the chillmold, in two parts, coming into contact with the metal casting a consist of metal or a metal-alloy of different heat-conductingcapacity. At both sides of the mold, a layer, or plate I) of badly heat-conducting metal I is provided, while m the center at d better heat-conducting metal is provided. The center arts (1 can be formed by the chill-mold a o cast-iron or other suitable metals. This articularly adapted for plate-casting, as the cast plate a will thereby solidify in the center approximately within the same time as at the sides.
The entire chill-mold may of course be made of badly heat-conducting metal or a metal-alloy.
The design and production of the other parts of the chill-mold may differ, the parts of the mold may be connected flexibly folding, or otherwise.
claim: 1. A chill mold for casting non-iron metals consisting of a metal of badheat con-- ducting capacity amounting to substantially one-third of the heat conducting capacity of cast iron.
2. A chill mold for casting non-iron metals consisting of a metal alloy of bad heat conducting ca acitz amounting to substantially one-thir of t e heat conducting capacity of cast iron.
3. A chill mold for castin non-iron metals consisting of a metal 0 bad heat conducting capacity of below 0.05 caloric unit par 0.4 inch thickness per second and degree als, a layer of a metal of bad heat conductm capacity amounting to substantially onethird of the heat conducting ca acity of cast ron, connected to the chill mo d and formmg the inner wallin of the mold.
5. In a chill mold %or castin non-iron metale, 1. layer of a metal of be beat conducting capacity amounting to substantially onethird of the heat conducting capacity of cast iron, connected to the chill mold and forming the inner walling of the mold, and a layer of a better heat conducting metal at the center of the mold and at the surfaces of the latter contacting with the liquid meta l, whereby to obtain a uniform solidificatlon over the entire casting.
In testimony whereof I aflix my si nature.
ABRAHAM M. ERIC SEN.
4 In a chill mold for casting non-iron met