Method of manufacturing injection molding manifold with plugs

Details Method of manufacturing injection molding manifold with plugs Method of manufacturing injection molding manifold with plugs

B - Operations, Transporting

23

K

26/210

B23K 33/00 (2006.01) B23K 1/00 (2006.01) B23P 15/00 (2006.01) B29C 45/27 (2006.01)

Patent

CA 1230473

ABSTRACT OF THE DISCLOSURE This invention relates to an improved method of manufacturing injection molding manifolds for multi- cavity molding. The method includes gun drilling a longitudinal duct through a steel manifold body, drilling a transverse inlet duct to connect to an inlet on one surface of the manifold, and drilling diagonal outlet ducts to connect to spaced outlets on the opposite surface of the manifold. The outlet ducts are smaller in diameter than the longitudinal duct to match the rest of the system. Before the outlet ducts are drilled, end portions of the longi- tudinal duct are drilled out to a larger diameter and steel plugs having a tapered well are securely welded into them with the mouth of the well in align- ment with the longitudinal duct. The plugs are larger in diameter than the central portion of the longitudinal duct to avoid the formation of thin knife edge portions where the outlet ducts join the longitudinal duct which often break down during use. The smaller diameter outlet duct is then drilled diagonally to intersect the well in the plug at its smaller blind end. The joint is then smoothly finished to remove any irregularities and provide a smooth transition between the larger diameter longitudinal duct and the smaller diagonal outlet ducts at each end.

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