摘要:
Vorgeschlagen wird eine Gießvorrichtung zum Gießen eines Zylinderkurbelgehäuses nach dem Niederdruckgießverfahren mit einem als Schmelztiegel zur Aufnahme von Metallschmelze dienenden mit Überdruck beaufschlagbaren Ofenraum (12), einer oberhalb des Ofenraums angeordneten Gussform (16) mit einem die Außenkontur des zu gießenden Zylinderkurbelgehäuses gießtechnisch abbildenden Formhohlraum, und einem den Behälter (12) und die Gussform (16) verbindendes Steigrohr (14) zum Füllen des Formhohlraums mit Metallschmelze von unten her. Für eine Verbesserung der Gießvorrichtung hinsichtlich des Speisungsdrucks und der Formtemperierung in kritischen Bereichen weist die Gießvorrichtung eine Anordnung des Formhohlraums (18) derart auf, dass dieser die Kurbelwellenlagerstühle oben und die Zylinderkopfdeckflächen (22) unten gießtechnisch abbildet.
摘要:
A pneumatic hammer or de-coring vibrator is for de-coring of foundry castings. The hammer includes a jacket, in turn having an inner chamber; an inlet circuit for the entry of compressed air, and an outlet circuit for the exit of compressed air. The hammer further includes a motion mechanism for generating vibratory motion under the action of compressed air. The motion mechanism is arranged within the inner chamber of the jacket; and a punch or beater is connected to the motion mechanism, for coming into contact with the casting to be subjected to de-coring. The jacket of the hammer is made of an alloy including aluminum, silicon and magnesium.
摘要:
The present invention relates to a casting core (1) of a casting mould for producing a cylinder of an internal combustion engine, in particular of a two-stroke engine. It is essential for the present invention that the casting core (1) has a two-part form, specifically is formed from a sand core (2) and a steel core (3) connected thereto. As a result, it is possible to achieve uniform cooling and to at least reduce void formation.
摘要:
The invention relates to a method for producing a cylinder (10, 110) for a two-stroke engine, comprising the following steps: producing a casting core (30, 130), wherein a central core slide (31, 131) for the cylinder chamber (11, 111) and at least one salt core (33, 133) for an overflow channel (18, 19; 118, 119) are produced and the at least one salt core (33, 133) is connected to the central core slide (31, 131), inserting the casting core (30, 130) into a casting mold, casting the cylinder (10, 110) in a die-casting process, removing the central core slide (31, 131) from the cylinder (10, 110), wherein the at least one salt core (33, 133) is separated from the central core slide (31, 131), and flushing the at least one salt core (33, 133) out of the cylinder (10, 110). The invention further relates to a casting core (30, 130) for such a method.
摘要:
A mold assembly for forming a piston and method of molding a piston therewith includes a pair of mold halves moveable toward and away from one another along a linear path that is substantially perpendicular to a longitudinal cenntral axis of the piston between an engaged position to provide at least a portion of a mold cavity for forming an outer periphery of the piston and a disengaged position to allow extraction of the piston from the mold cavity. The assembly also has a pair of cooling gallery mandrels moveable along a linear path into an engaged position between the pair of mold halves to form an undercut cooling gallery of the piston. The pair of cooling gallery mandrels are movable to a disengaged position to allow extraction of the piston vertically along the axis.
摘要:
The present invention relates to a casting mould for casting a cast part, in particular an engine block for an internal combustion engine, and the use of such a casting mould which is made up of mould parts 1, 2, 3, produced from moulding sand, and casting cores 4, 5, 6, 7, and has at least one casting core 4, 5, 6, 7 for forming a space in the cast part. The casting mould according to the invention makes it possible in a simple way to produce cast parts in which at least one locally confined portion is formed with a different microstructure than the rest of the cast part. This is achieved by a portion of the casting core 4, 5, 6, 7 being formed by a chill 9, which is made from a material of a thermal conductivity that is many times greater than the thermal conductivity of the remaining portion 8 of the casting core 4, 5, 6, 7, consisting of moulding sand.
摘要:
An unmachined cylinder head casting for producing a cylinder head for internal combustion engines powered with Diesel fuel has a sealing surface (2) intended for mounting in the finished state on a corresponding sealing surface of an engine block and designed on a sealing surface section (8) of the unmachined cylinder head casting (1), the thickness (D) of section (8) in the casting state exhibiting a machining allowance (Dz2) in relation to its set thickness (Dn) obtained after a material-removing finishing of the sealing surface (2), the sealing surface (2) further including a combustion chamber region (3) associated with the combustion chamber formed in the engine block. According to the invention, an optimum load-bearing capacity of this type of cylinder head (1) is achieved in a simple manner, in that the machining allowance (Dz2) of the sealing surface section (8) in the combustion chamber region (3) of the sealing surface (2) amounts to maximum 15 % of the machining allowance (Dz2) of the sealing surface section (8) in the remaining region of the sealing surface. Also disclosed is a finished cylinder head produced from the unmachined cylinder head casting according to the invention, and a process for producing the same.
摘要:
Verwendung von wenigstens einer gekühlten Metallpinole als Kern für die Bildung des Zylinderhohlraums eines in einer Sandform gegossenen Zylinderkurbelgehäuses aus einer Leichtmetalllegierung mit wenigstens einem Zylinder zum Erzielen einer zum Aufbringen einer abriebfesten Beschichtung geeigneten Zylinderlauffläche mit sehr geringer Porosität.