GB1297037A - - Google Patents

Abstract

1297037 Casting composite articles AUTOFLOW ENG Ltd 20 July 1971 [21 July 1970] 35368/70 Heading B3F Apparatus for casting a metal holding block on to one side of a lens comprises a die head 40 having peripheral cooling-fins 42 and a seating 58 for a lens, a holder 41 on which the head is located, and means 52 for releasably securing the head to the holder. The holder 41 has a cylindrical case 45 rotatable within a fixed sleeve 44 by means of a handle 48. A rod 47 extends through a bore in the core 55 and is used to eject the lens and holding block from the die. The die head 40 is secured to the holder 41 by two spring members 52 which engage the lower fin. The head 40 is released from the holder by rotating the head to a position in which cut-out portions of the lower fin are aligned with the member 52, and withdrawing the head in an axial direction. Molten metal is supplied to the space within the die head 40 from a container 16 via a passage 21, pipe 35 and groove 54. The passage 21 is formed in a metal block 20 which is heated by a heater 23. Control of the flow of molten metal through said passage is by means of a member 26 which is raised and lowered by a handle (33). The member 26 is provided with a bore 27 in communication with the atmosphere so that when the outlet passage 21 is closed by said member any metal remaining in the passage 21 and pipe 35 can flow out.