Abstract: Partially devitrified silica cores with exceptional high temperature strength are disclosed for foundry use in sand casting of ferrous alloys. Precision cored holes of small size and long length, which heretofore could not be cast accurately or had to be machined because of limitations in existing core technology, are formed using accurately machined extruded porous silica cores fired to eliminate combustibles and partially devitrified (e.g., 15 to 30%) to develop a strong crystalline phase bond that resists viscous flow at a temperature of 1500.degree. C. and to increase the refractoriness of the vitreous silica grains, whereby the permeability and thermal shock resistance are such that the core can be heated very rapidly by molten steel to above 1500.degree. C. without spalling, cracking, sagging, breaking, or loss of integrity and without gas holes, scabs, fissures or other serious casting defects.

Abstract: A device as disclosed for operation with mold or die cavities of a die casting machine or injection molding machine for venting the cavity to allow gas therein to escape from the cavity when it is being filled with molten metal or the like. The body of the device includes a plurality of passageways providing communication between the die cavity and the atmosphere.

Abstract: Apparatus for adding materials, especially powdered or granular materials, to a flowing stream, e.g. of molten metal, comprises a nozzle for compressed gas, blowing the additive into the stream, and a detector that detects the stream and switches the flow of additive on and off according to whether the stream is present or absent. The detector is preferably of a non-contact type, sensing radiation from the stream, preferably visible light. The rate of flow of additive can be adjustable. There can be a fail-safe optical detector arrangement monitoring the flow of additive and signalling an alarm if the flow fails or if the nozzle is blocked. The timings of the start and end of the flow in relation to the detection of the metal stream are independently adjustable to ensure that the additive and metal coincide.

Abstract: A diecasting apparatus according to the invention comprises an injection cylinder vertically arranged having its upper end communicating with a cavity of dies for diecasting, a melt chamber cylinder coaxially located below the injection cylinder and having an inner diameter substantially the same as that of the injection cylinder, a plunger movable through the melt chamber and injection cylinders to form a melt chamber defined by an upper surface of the plunger and an inner surface of the melt chamber cylinder, thereby to form a hermetically closed space by the melt chamber and cavity, and heating and melting means arranged about the melt chamber cylinder, thereby enabling the molten material to be injected into the cavity through the shortest distance for the shortest period of time, whereby high quality diecast products of high melting point metals are obtained.

Abstract: Disclosed is a prefabricated pontic framework formed of a non-precious material and method to be used in making dental bridges. The prefabricated pontic framework comprises a plurality of pontic supports with a connecting bar mounted on opposed sides of each pontic support, such pontic framework being selected and cut to size for a particular bridgework situation.

Abstract: Die castings are made from metal compositions that are fully liquid or as a preferred embodiment contain between about 10 and 85 weight percent degenerate dendrites. The composition is injected into the cavity of a die at a mean die temperature which is as near to ambient temperature as possible and usually less than about 400.degree. F. The die is formed of a material having a thermal diffusivity of at least about 0.5 cm.sup.2 /sec. The castings are ejected and the die surface is sprayed with a liquid to bring the die surface temperature back to the mean die temperature or below in the shortest possible time. The time between injection and ejection is less than about 1 minute and the time between ejection and spraying is less than about 30 seconds.

Abstract: A process for producing single crystal Hg.sub.1-x Cd.sub.x Te is disclosed. An ingot of Hg.sub.1-x cd.sub.x Te is prepared from a stoichiometric mixture of mercury, cadmium and tellurium by the supercooling of a heated mixture thereof from a point above liquidus to a point, a predetermined function of x, below liquidus. The ingot is then quenched in ambient air, producing a large amount of crystallites with small grain boundaries. The subsequent application of heat to the ingot yields a relatively large amount of single crystal material.

Abstract: A mold facing for producing a gas-permeable, non-gassing and, in view of its small thickness and its porosity, heat-conductive cladding of a centrifugal ingot mold for copper and its alloy contains pulverulent material in a dispersing agent, particularly water, evaporating without residue. The pulverulent material has titanium dioxide (TiO.sub.2) as the main constituent or the sole constituent, preferable with an average particle sizes of about 15 .mu.m. A process for cladding a centrifugal ingot mold by using such a mold facing contemplates at first preheating the mold and subsequently applying the mold facing by spraying to the inner wall of the centrifugal ingot mold rotating around its axis in form of a suspension free of binding agents and surface active agents as a thin layer of, as far as possible, uniform thickness of preferably 0.1 to 0.3 mm and subsequently evaporating the dispersing sheet of the mold facing without leaving any residue for obtaining a porous layer.

Abstract: An apparatus and method for producing ingot mold caps is provided in which a shaped opening in a chill element is lined with a preformed refractory fiber pad and metal is cast in the lined opening around a cored staple.

Abstract: A method is described reducing remaining tensions and corrosion resistance in welded joints by explosion finishing thereof, comprising disposing over the axis of the weld seam an explosive charge in the form of a periodic curve, the axis of which is substantially co-extensive with that of the weld seam with the amplitude thereof extending from one side of said seam to the other, and then detonating said explosive charge. In one embodiment an auxiliary explosure charge is disposed substantially linearly over the axis of the weld seam to assure complete detonation of the charge disposed in the form of a periodic curve and comprising the main charge, and then both charges are simultaneously detonated.

Abstract: In order to be able to locate stuck rollers of a roller way as early as possible, with longer operational interruptions being avoided and the demounting of constructional parts of the roller way being not necessary, an arrangement for this purpose includes a supporting body which is movable along the roller way and carries a frictional head. The frictional head is pressable against the surface areas of subsequently arranged rollers. Means are provided for recording and measuring a difference between the velocity of the supporting body with which the latter is moved along the roller way and the velocity of the frictional head getting into contact with a roller.

Abstract: Battery plates are assembled into stacks forming positive and negative rows of lugs and the stacks are placed within the cells in a battery case. Molding channels are automatically formed around the positive and negative rows of lugs and molten lead alloy is automatically introduced into the molding channels to cast the straps and intercell connections simultaneously within the battery case.

Abstract: A method for controlling a casting and rolling mill by measuring the speed of a cast strip between the casting machine and the first following rolling mill and regulating the speed of the casting machine directly proportional to the measured speed of the cast strip. It is thus possible to avoid auxiliary equipment required in prior art systems such as pinch rolls and a continuous furnace between the casting machine and the first following rolling mill. Furthermore no loop on the cast strip is required. As a result, great reductions in capital expenditures, the energy required to operate the line and the necessary space can be obtained.

Abstract: A supported melting pot for recovered globules of solder includes a metering valve and feeder tube through which melted solder is delivered in controlled amounts to a die. The die includes separable sections, at least one of which is heated, and is provided with an elongated spiral molding groove. On each use of the apparatus, a spiral solder section having a length as great as twenty feet is produced.

Abstract: A method is disclosed for the production of amorphous metal tapes by rolling and cooling a molten metal stream between the contact faces of one roll and one metal belt. Tapes having controlled dimensions may be obtained.

Abstract: Casting metal in rigid, self supporting, gas permeable molds with one or more mold cavities for molding one or more parts, in which the mold cavities have gate passages with their lower open ends at the lower surface of the mold, by submerging the lower ends of the gate passages beneath the surface of molten metal and applying a reduced pressure to the upper surface of the mold to fill the mold cavities with molten metal to produce unconnected metal parts or groups of parts.

Abstract: An arm for holding the impact stylus of a high speed dot matrix printer is fabricated from a single stamping which when properly folded defines two members having C-shaped cross-sections joined by a thin web. The web is folded around the stylus to bring the 4 legs of the two C-shaped members into overlapping relationship to define a hollow elongated and tapered arm having the stylus substantially wholey encircled by the web whereby after brazing the stylus is securely held.

Abstract: Method and apparatus for producing ceramic shell molds characterized in that a plurality of pattern set-ups are arranged with their longitudinal axes transverse to an axis of rotation and are rotated as a group while applying fluent refractory material to produce either a multiple number of molds or a single mold. A ceramic shell mold characterized by a main sprue passage, a plurality of transverse sprue passages extending therefrom, and casting cavities gated into the transverse passages.

Abstract: Apparatus and method of venting a plate fin coil during the ultrasonic soldering of aluminum return bend tubes to the heat exchange tubes in the coil. The apparatus includes a snorkel member arranged on the heat exchanger carrying mechanism whereby one end of the snorkel is telescoped in the open end of a heat exchange tube forming an end of a circuit in the coil, with the other end communicating with the atmosphere, whereby pressure in the interior of the circuit is relieved when the coil is immersed in the solder bath.

Abstract: A method for joining a member to a diecast article using an apparatus comprising dies, an injection sleeve communicating with a cavity of the dies and a plunger tip slidably arranged in the injection sleeve for filling the cavity of the dies with the molten metal previously poured in the injection sleeve. According to the invention, the plunger tip is formed with an insert aperture for receiving the member to be joined such that a portion of the member extending beyond an upper surface of the plunger tip is exposed in the molten metal when it is poured in the injection sleeve, thereby sufficiently transmitting the heat of the molten metal to the portion of the member to obtain a metallurgical bond at a boundary between the member and the diecast article.