摘要:
[PROBLEMS] To provide a lost-wax cast impeller for a supercharger having no parting line corresponding part on a hub surface and a blade surface in each space demarcated by pairs of long blades adjacent to each other and having excellent aerodynamic performance. [MEANS FOR SOLVING PROBLEMS] This method of manufacturing the impeller comprises a step for forming a lost form pattern formed in the suhstantially same shape as the impeller for the supercharger, a step for forming a mold by eliminating and removing the lost form pattern after the lost form pattern is coated with a refractory, and a step for pouring a molten metal in the mold for casting. In the step for molding the lost form pattern, a lost material is injection-molded in a space demarcated by radially arranging, toward a center shaft, a plurality of slide molds having short blade-shaped bottomed groove parts and space shapes between the pairs of long blades adjacent to each other, and the slide molds are released by moving in the radial direction of the center shaft while rotating. Thus, the parting line corresponding part is not present on any of the hub surface and the blade surface in the spaces demarcated by the pairs of long blades adjacent to each other.
摘要:
A method for producing a cast component comprises forming a thin shell ceramic casting mold with a wall thickness less than about 1.52mm (0.060 inches) by the photopolymerization of a ceramic filled resin. A molten metal is poured into the thin shell ceramic casting mold without providing additional support to the casting mold. A thermal gradient is moved through the molten metal within the thin shell ceramic casting mold to cause solidification into a cast component with a single crystal or directionally solidified microstructure.
摘要:
A rear frame 5 of a motorcycle 1 is of a longitudinally elongated shape and provided with a pair of right and left rail parts 5a connected by a plurality of cross members 5b. The rear frame 5 is formed by die-casting and a plurality of gate parts G1 to G5 to pour the molten metal through are located separately along the rail parts 5a. It is possible to shorten the metal pouring process and prevent casting defects such as underfills.
摘要:
Die vorliegende Erfindung betrifft ein Werkzeug zum Gießen eines Formteils für die Herstellung einer Turbinenschaufel (10) mit mehreren Werkzeugblöcken (1, 2, 3, 4), die in einer vorgegebenen Weise formschlüssig zusammengesetzt einen Hohlraum (5) für das Formteil bilden, in den über einen oder mehrere Zugangsöffnungen (6) fließfähiges Material einbringbar ist. Zumindest einer der Werkzeugblöcke (1, 2) nimmt einen dreh- oder verschiebbaren Einschub oder Einsatz (7, 8) auf, der mit einer Fläche an den Hohlraum (5) angrenzt und in unterschiedliche Positionen und/oder Orientierungen gegenüber dem Werkzeugblock (1, 2) fixierbar ist, so dass in den unterschiedlichen Positionen und/oder Orientierungen des Einschubs oder Einsatzes (7, 8) unterschiedliche Hohlraumgeometrien gebildet werden. Das Werkzeug ermöglicht eine nachträgliche Änderung der Geometrie des Formteils, insbesondere des Anstellwinkels, ohne hierfür neue Werkzeugblöcke fertigen zu müssen.
摘要:
Die vorliegende Erfindung betrifft eine Vorrichtung zur Herstellung von Gusswerkstücken, insbesondere filigraner Präzisionsgussteile im medizinischen Bereich, bestehend aus einem Muffelformer (1) zur Aufnahme einer beim Abbinden expandierenden Einbettmasse (5), die zur Bildung einer Gießform ein dem zu gießenden Werkstück entsprechendes Modell umschließt. Die Erfindung ist dadurch gekennzeichnet, dass der Muffelformer (1) in bewegbare Segmente (4) unterteilt ist, die der beim Abbinden auftretenden Expansion der Einbettmasse (5) weichen.
摘要:
The invention concerns improvements to a method for producing cast-iron parts with a section having an outer contour which is helically symmetrical to an axis of symmetry such that these parts can be more simply produced and hence more economically. According to the invention, a pattern (84) comprising the section (16) with a helically symmetrical outer contour is shaped so as to produce a casting mould body (50) which surrounds this section azimuthally to the axis of symmetry and in an enclosed manner, and a casting (10), which corresponds to the part to be manufactured, is produced with this casting mould body (50) in a casting mould (44) by tempering which leads to solidification of the cast-iron melt shell.
摘要:
An apparatus (20, 50) for defining a thin, shell-like mold space (4A) in a flask (3) is disclosed. The apparatus includes metal forms (4, 4; 26A, 26B, 26C; 46A, 46B) that are located over both a pattern plate (2) and a pattern (1), which has stepped parts. By fasteners (5, 6) these metal forms are attached, for example, to the inner wall of the flask (3). These metal forms have surfaces that correspond to the surfaces of the pattern (1) and a pattern plate (2). The surfaces of the metal forms are spaced apart a predetermined distance from the surfaces of the pattern and pattern plate so that they define a thin, shell-like mold space (4A) over both the pattern and pattern plate. When self-hardening molding sand is charged into the mold space, a mold that has a thin, uniform thickness is produced.
摘要:
The subject of this invention is production of permanent metal moulds (1) with insert (2) of the gating system for casting mill balls and other crushing elements. The known method for mill balls casting are those using moulds of sand-binder mixture which moulds can serve for a single use only. Disadvantage of such moulds is in their lower heat conductivity which affects the structure and properties of produced balls. To get the appropriate quality grade of balls it is necessary, apart from the high content of alloying elements, to apply very complex thermal treatment. Authors of this invention have solved the problem in such a way that one metal mould can serve for repetitive use of several thousand times. With regard to thermo-physical properties of the mould, cooling of cast balls can be very intensive owing to which the casting process gives such structure and other ball properties that balls of high quality can be produced even from materials having a lower content of alloying elements. The problem of ball rising is solved by introducing an insert made from sand-binder mixture in which way the issue of controlled metal solidification in the mould has also been solved. To increase the operational life of tools (metal moulds), and to make them easy replaceable, and to lower the costs of mould amortization, authors have introduced ball crystallizers (14) in the mould (1) as replaceable part. In this way, after sometime of mould operation, only the crystallizers (14) are to be replaced and since all other mould parts (2-13) are rather resistantto wear and tear their operational life will last long. Crystallizers (14) are made from alloyed steel, suitable for water cooling, or are made from hard copper i.e. Cu-Cd; Cu-Cr; Cu-Ag and Cu-Be to which the alloying elements are added in small quantities which do not affect heat conductivity of copper but on the contrary increase its hardness.