Showing papers by "Weingarten Realty Investors published in 1981"

Diecasting method for producing cast pieces which are low in gas, pores and oxides, as well as diecasting machine for implementing the method

Abstract: A diecasting process for producing cast pieces for metals or their alloys by means of a horizontal cold chamber diecasting machine. The diecasting machine includes a diecasting mold held under a vacuum, a fill chamber coupled to the diecasting mold, a holding furnace containing metal melt, a suction pipe partially immersed in the holding furnace and coupled to the fill chamber, means for transporting metal melt from the holding furnace through the suction pipe into the fill chamber under a vacuum, and means for moving the metal melt from the fill chamber into the diecasting mold. During the dosaging phase when the fill chamber is filled with metal melt, gases and lubricant vapors are developed upon entry of the melt into the fill chamber. The process includes the steps of maintaining the vacuum in the fill chamber during the dosaging phase until the gases and lubricant vapors so developed have been substantially extracted and maintaining the vacuum in the fill chamber to its maximum extent until the diecasting mold is completely filled with the metal melt.

Apparatus for producing cast products

Abstract: Bei einem Druckgiesverfahren zur Herstellung gasarmer, porenarmer und oxydarmer Gusstucke, insbesondere Gusstucke von ca. 1 bis 3 kg Schusgewicht aus Metallen oder deren Legierungen, vorzugsweise aus Aluminium-Legierungen, mittels einer vorzugsweise horziontalen Kaltkammer-Druckgiesmaschine bekannter Bauart, bei dem der Transport des Metalles aus der Schmelze bzw. aus einer Warmhalteeinrichtung (9) in eine Fullkammer (10) mittels Vakuum uber die Duse (7) eines Saugrohres (6) erfolgt und die Druckgiesform (14,16) unter Vakuum gehalten wird, wird zur Erzielung einer besonders hohen Produktivitat sowie zum Erreichen von Gusstucken hoher Qualitat und geringen Oxydgehaltes vorgesehen, das das Vakuum wahrend der Dosierung solange aufrecht erhalten wird, bis die beim Einlaufen der Schmelze in die Fullkammer (10) entstehenden Schmiermitteldampfe und -Gase nahezu vollstandig abgesaugt sind, wobei das Vakuum in der Fullkammer (10) bis zum Abschlus . In a die casting method for producing low-gas, pore-low and low-oxide castings, particularly castings of about 1 to 3 kg shot weight from metals or their alloys, preferably aluminum alloys, by means of a preferably horziontalen cold-chamber die casting machine of known design, in which the transport of the metal from the melt or from a holding device (9) in a filling chamber (10) via the nozzle (7) of a suction tube (6) by means of vacuum and the die (14,16) is maintained under vacuum, is used to achieve a particularly high productivity, and to achieve castings of high quality and low Oxydgehaltes provided that the vacuum during the dosing is maintained as long until the arriving of the melt in the filling chamber (10) resulting lubricant vapors and gases are almost completely removed by aspiration, the vacuum in the filling chamber (10) to completion. der Formfullphase in vollem Umfang aufrecht erhalten bleibt. the mold filling stage is maintained in full. Bei einer Druckgiesmaschine zur Durchfuhrung dieses Verfahrens wird neben dem Vakuum-Anschlus (17) fur die Form (14,16) ein weiterer Vakuum-Anschlus (2) entweder im Bereich des Gieskolbens (4) an der Fullkammer (10) vorgesehen oder uber eine Bohrung der Kolbenstange (21) bis in den Bereich des Gieskolbens (4) gefuhrt, wobei in letzterem Fall der Vakuum-Anschlus (2) dort aus dem Gieskolben (4) austritt. In a die casting machine for implementing this method in addition to the vacuum connection (17) for the mold (14,16) there is provided a further vacuum connection (2) either in the area of ​​the casting piston (4) to the filling chamber (10) or a bore of the piston rod (21) up to the area of ​​the casting piston (4) guided in the latter case the vacuum connection (2) there out of the casting piston (4) emerges.

Investment casting mold base

Abstract: An investment casting mold base has an enlarged, ellipsoidal-shaped body overlying a frusto conical-shaped body on the base. The enlarged body will form a molten metal staging cavity between a funnel cavity at the entrance of the mold formed by the frusto conical body and sprue channels leading to the article cavity in the mold. The staging cavity eliminates backup of molten metal at the mold entrance and possible spillover of the metal from the crucible mated to the mold during the centrifugal casting operation.

Assembly machine system for laminar packet of large generator - uses rotary table with positioning stops for laminate fed from feed stations

Abstract: The machine assembles the circular segments of rotor and stator packets using a large rotary table (13) with stops (18) that position the segmental laminae on the table during assembly. One or more automatic feed stations (I-III) are distributed around the table and feed the segmental laminae onto the growing packet on the table. A servomotor (15) is used to step the table such that the distance covered during each step is related to the number of segments in 360 degrees. A programmable CNC control with VDU terminal is used for controlling and overseeing the entire assembly process.