초록 ▼

An arrangement incorporated with a mold for use in a die casting machine or an injection mold machine comprising: a gas vent passage formed in the mold communicating with a cavity of the mold; two symmetrical by-pass passages branched from the gas vent passage; a gas discharge passage communicating

An arrangement incorporated with a mold for use in a die casting machine or an injection mold machine comprising: a gas vent passage formed in the mold communicating with a cavity of the mold; two symmetrical by-pass passages branched from the gas vent passage; a gas discharge passage communicating with the outside of the mold; and valve means including a valve chamber formed in the mold having a valve located therein and communicating with the above-mentioned passages. The valve in a first position cooperates with the valve chamber to prevent the gas vent passage from communicating with the gas discharge passage, but prevents both the gas vent passage and the by-pass passages from communicating with the gas discharge passage when in a second position. A portion of the melt forced to flow from the cavity through the gas vent passage upon impingement of that portion of the melt against the valve drives the valve from the first position to the second position before any of the melt forced to flow through the by-pass passages reaches the valve chamber.

대표청구항 ▼

A gas-venting arrangement incorporated with a mold formed of stationary and movable mold halves with parting faces perpendicular to the axis of the mold and together defining a cavity to be filled with a metal melt, said gas venting arrangement comprising: a . a valve chamber formed in said mold, sa

A gas-venting arrangement incorporated with a mold formed of stationary and movable mold halves with parting faces perpendicular to the axis of the mold and together defining a cavity to be filled with a metal melt, said gas venting arrangement comprising: a . a valve chamber formed in said mold, said valve chamber having an axial extension and including an enlarged forward portion, a constricted rear portion, and a valve seat formed between said forward and rear portions; b. a gas vent passage formed in said mold connected to said cavity and to a forward end of said forward portion of said valve chamber; c. a gas discharge passage formed in said mold and opening on an inner side surface of said rear portion of said valve chamber to communicate with the outside of said mold; d. at least one by-pass passage formed in said mold branching from a point on said gas vent passage to an opening on an inner side surface of said forward portion of said valve chamber; e. a valve having an axial extension coaxial with said axial extension of said valve chamber and slidably received in said forward portion of said valve chamber for movement between a first position, wherein said valve cooperates with said valve chamber to prevent said gas vent passage from communicating with said gas discharge passage through said forward portion of said valve chamber and to permit said by-pass passage to communicate therewith through said valve chamber, and a second position, wherein said valve rests against said valve seat and cooperates with said valve chamber to prevent both said by-pass passage and said gas vent passage from communicating with said gas discharge passage through said valve chamber; and f. urging means for biasing said valve into said first position and permitting movement of said valve into said second position under axial impingement against said valve of a portion of said melt injected into said cavity and forced to flow through said gas vent passage into said forward portion of said valve chamber, said urging means being adjusted and said by-pass passage being dimensioned and configured to permit movement of said valve into said second position before a second portion of said melt reaches said forward portion of said valve chamber through said by-pass passage.