Full-mold casting

Abstract: The invention relates to casting methods, in particular to a full mold casting technique for a diesel engine cylinder body. The full mold casting technique for the diesel engine cylinder body comprises the following steps that a, prefoaming is conducted; b, curing is conducted; c, foam forming is conducted; d, models are combined into a cluster; e, the models are coated; f, a mold bed is prepared; g, a full mold model is placed; h, sand filling is conducted; i, sealing and shaping are conducted; j, pouring and displacing are conducted; and k, cooling and cleaning are conducted. The full mold casting technique for the diesel engine cylinder body has the beneficial effects that firstly, excellent foam plastic beads are used for further reducing the amount of residual carbon; secondly, the reasonable bead prefoaming density is effectively controlled, so that the situation that a white mold deforms and even breaks due to the fact that the strength of the white mold is insufficient is avoided, and the defects, such as pores and carbon defects, of castings are also avoided; and thirdly, the problem that the quality of the castings is low is solved, and thus volume production of diesel engine cylinder bodies is achieved.

Abstract: A pit defining a machining cavity is positioned downstream of a loading conveyor. A workpiece such as a foam block to be machined into a lost foam pattern for use in full-mold casting is fixedly mounted on an invertable workpiece mount base that is positioned above the machining cavity. The machining cavity houses a cutting unit for cutting, from below, the foam block supported on the workpiece mount base. Chips produced when the foam block is cut by the cutting unit are discharged by a chip discharger disposed beneath the machining cavity. The machining cavity can be substantially closed by the workpiece mount base or the foam block mounted thereon. There may be employed upstream and downstream machining stations each having the machining cavity, the workpiece mount base, and the cutting unit. The workpiece mount base in the upstream machining station is vertically movable, and the upstream and downstream machining stations are interconnected by transfer units. After one side of the foam block has been cut by the cutting unit in the upstream machining station, the foam block is elevated and then transferred to the downstream machining station in which the opposite side of the foam block is cut by the cutting unit.

Abstract: A helical compressor having hollow male and female rotor components of the type used as a supercharger for an internal combustion engine. The compressor is provided with a manifold plate which cooperates with the manifold to evenly distribute the high pressure discharge from the compressor throughout the associated plenum or manifold. The hollow rotor components are cast by full mold casting techniques in which an expendable foam pattern is first made in a metal mold and then placed in a sand-filled flask and poured with an appropriate foundry metal. The interior and exterior surfaces of the rotor pattern parts having helically extending lands and grooves permitting helical ejection of the pattern parts from the mold.

Abstract: The invention discloses a method for preparing a full-mold casting coating. The full-mold casting coating prepared by the method is high in anti-burn-on capacity and capable of improving rigidity and high-temperature resistance of molds, while cost is reduced to the utmost extent. A high-current rheological fluid is formed by optimizing blending of aggregates and various additives, and has betterwettability and brushing property to foamed plastic molds. According to practices, the coating thickness of the coating can be at least 1.7mm after the coating is brushed by twice and is capable of meeting requirements for anti-burn-on capacity and transporting of large-size castings. The full-mold casting coating has excellent suspended property, thixotropy, breathabililty and higher surface strength, the method for preparing the full-mold casting coating is simple, convenient in operation and low in cost, and raw materials for preparing the full-mold casting coating are rich. In addition, surfaces of the full-mold castings produced by the full-mold casting coating are smooth and bright and free of defects of wrinkles, carbon black and the like, and coating layers on the surfaces are easy to be stripped and convenient to be cleaned.