B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/17 (2006.01) B29C 45/00 (2006.01) B29C 45/03 (2006.01) B29C 45/56 (2006.01)
Patent
CA 2399758
Method and apparatus for molding a sealing surface on a molded part wherein the sealing surface preferably constitutes a surface of revolution and the part is molded in separable first and second partable mold halves that mate and meet when closed at a major parting line plane. First and second mold inserts are provided respectively in first and second mold halves that each have a sub-insert trim wheel component each defining a cooperative mold half cavity. The trim wheel half cavities together define a complete annular molding surface shaped to mold form the sealing surface of revolution when said mold inserts are closed together to define a minor parting line plane therebetween. The sub-inserts in said associated inserts mold half rotate about an axis parallel to the major parting line plane such that the minor parting line plane of the mold sub-inserts is orientable through a given range of angular travel including a position flush with the mold major parting line plane. When the mold halves are closed together, the sub-inserts are angularly rotatably positioned at an angular starting position such that the minor parting line plane is preferably angularly offset a given amount from the flush planes position thereof. The complete mold cavity is then filled with molding material in a liquid state and allowed to harden at least to a self sustaining solidification strength at least in the part sealing surface zone adjacent the mold-sub-inserts cavity-defining surfaces. The sub-inserts are then rotated as a unit relative to the mold halves to thereby angularly shift the minor parting line plane of the sub-inserts and thereby move any patting line flash resident between the sub-inserts to a second predetermined position angularly offset from the starting position whereby such sub-insert parting line flash that might otherwise remain on the sealing surface is removed from attachment to, and/or smeared smooth along, such surface. The sub-inserts are then rotated to their flush planes position to thereby bring the minor and major parting lines flush with one another, and then the mold halves are opened to remove the completed molded part.
Bernard Edward Helmut
Marks & Clerk
Mould Bernard
LandOfFree
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