Abstract: A method and apparatus are described for the production of piston castings, and, in particular, a die construction and method of use thereof are described, the die having a crown forming part (18) separable from a skirt forming part (12). In the method, when solidification of the casting occurs to an extent at least enabling the separation of the skirt forming die part therefrom to be allowed, and the die parts (20, 22) are separated, the casting is retained by the crown forming part (18) of the die. After a subsequent process step, such as the solidification of the remainder of the piston casting, and or the cooling of the piston casting by an air blast (64), the solidified piston is removed from the crown forming part of the die.

Abstract: The die for the production of piston blanks having high dimensional accuracy comprises an integral body and crown forming part with separate internal and pin boss bore cores and a single runner and feeder. Metal utilisation is greatly increased and fettling costs are greatly reduced.

Abstract: A method of producing a piston cylinder assembly for use in a windmill in which a compression ring is formed by casting molten metal around a piston head having a number of drilled holes on its side surface while the piston head is positioned within the cylinder. The compression ring formed is attached to the piston head by solidified metal within the drilled holes.

Abstract: A piston incorporating a thermal barrier is produced by first making an annular piston ring carrier insert from steel. The insert comprises an annular body to the upper and lower radially-inner edges of which are secured the upper and lower edges of an annular element which is channel shaped in radial cross-section and the channel in which faces radially outward. The element is soldered or welded to the insert body so that an enclosed annular space is defined between the element and body. The insert thus formed is then heated in molten aluminium to "alfinize" its external surface. The treated insert is subsequently placed in a piston mold and the piston is molded about it from aluminium.

Abstract: A piston molding machine comprising a base on which a pair of mold supports are mounted for movement in a straight line toward and away from one another. A mold half is mounted on each support, and when the mold halves are juxtaposed they provide a cavity for forming a piston. A mold cap is pivoted to each mold half about a transverse axis rearwardly of the face of the mold half. A piston motor extends between each cap and its respective mold support for pivoting the mold cap into position adjacent the mold half to define the top of the cavity and away from the mold half to provide clearance for removal of a piston formed in the mold.

Abstract: A light alloy piston having an annular cooling passage in its head portion is prepared by a process wherein a permanent mold, preferably having a steel shell and a water cooled bottom, is filled with the molten piston alloy. Thereafter, core elements, particularly a salt core for forming the cooling passage are introduced into the molten material by means of a holder and the permanent mold is held at an elevated temperature by external heating. The permanent mold is then lowered into a water bath for a given period of time. The soluble core, which has a specific gravity lower than that of the molten light alloy, is forced into the molten material to the desired position and depth using a holding device. The holding device is withdrawn from the remaining molten material when the solidification of the molten material has proceeded to the underside of the core.