Browse Prior Art Database

Automatic Degating

IP.com Disclosure Number: IPCOM000089317D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

McDonald, RJ: AUTHOR [+2]

Abstract

As shown in the figure, a plastic injection-mold die set is provided with a reciprocating shear blade 3 and an actuating cylinder 4. When the shear blade 3 is retracted, the mold cavity 5 is in communication with the gate or runner 6 through which the plastic material is introduced into the mold cavity. When the shear blade 3 is extended, the blade surface aligns with the cavity edges 7 to form a continuous mold surface.

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Automatic Degating

As shown in the figure, a plastic injection-mold die set is provided with a reciprocating shear blade 3 and an actuating cylinder 4. When the shear blade 3 is retracted, the mold cavity 5 is in communication with the gate or runner 6 through which the plastic material is introduced into the mold cavity. When the shear blade 3 is extended, the blade surface aligns with the cavity edges 7 to form a continuous mold surface.

In operation, plastic material is injected into mold cavity 5 with the shear blade 3 retracted. When the mold cavity is filled and while the plastic material is still in a plasticized state, the shear blade is extended to part the gate from the material confined in the mold cavity. When the material is ejected from the mold, the part is already degated to eliminate one operation, and the continuous mold finish on the part eliminates such additional rework that would otherwise be required to repair and finish the gate area of the part.

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