| 摘要 |
A hose connection element integrally cast as part of a cast structure such as a water outlet conduit for a vehicle engine comprises a tubular structure including a circumferential hose retaining bead with a flawless sealing surface between the bead and a proximal end thereof. A set of three vented tooling elements is used in creating a polystyrene pattern of the cast structure including integral hose connection element including first and second tooling elements to create first and second half-sections of a for a body portion pattern. The first and second tooling elements include a recess at one end thereof to form a socket depression in the body portion. The third tooling element comprises a cylindrical cavity including an outer wall and an inner wall, with the outer wall being uninterrupted by vent openings and including a circumferential area of protruberance near one end thereof, the parting line for the third tooling element being positioned along a crest of the protuberance. The improved method for lost foam casting of the cast structure including integral hose connection element includes the steps of: creating a pattern of a body portion of the cast structure including a circular socket seat, creating a tooling element for a cylindrical pattern section for the hose connection element of said cast structure without vent openings on the mold surface corresponding to the hose sealing surface of said cast structure, joining the pattern sections with tree pattern section for the hose connection element seating within the circular socket seat formed in the body portion of the cast structure, coating the pattern with a slurry, placing the pattern in a casting flask, and pouring molten metal within the dried slurry coating to form the cast structure.
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