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

1985-12-02

1986-09-02

Godici, Nicholas P.

Metal fusion bonding

Process

With shaping

228168, 228174, 425572, 425588, 29157R, 29157A, 29157T, B23K 3300

Patent

active

046091386

ABSTRACT:
This invention relates to an improved method of manufacturing injection molding manifolds for multicavity 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 longitudinal 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 alignment 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.

REFERENCES:
patent: 3775836 (1973-12-01), Jackson et al.
patent: 3791026 (1974-02-01), Dufrene et al.
patent: 4043740 (1977-08-01), Gellert
patent: 4333629 (1982-06-01), Roy
patent: 4433969 (1984-02-01), Gellert
patent: 4500030 (1985-02-01), Gerber et al.
patent: 4511528 (1985-04-01), Kudert et al.

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