초록 ▼

A process and apparatus for the internal gating of molds used to make a shaped article of aggregate filler infiltrated with a curable binder, including preparing a mold having a cavity and having gating tubes extending through the mold cavity and spaced from its surfaces, and the gating tubes having

A process and apparatus for the internal gating of molds used to make a shaped article of aggregate filler infiltrated with a curable binder, including preparing a mold having a cavity and having gating tubes extending through the mold cavity and spaced from its surfaces, and the gating tubes having walls with multiple openings therethrough which are located inside the mold cavity, the cavity being dry-packed outside of the tubes with aggregate filler and the interstitial spaces therebetween being pumped full of liquid binder to form a matrix, the binder entering through the tubes and their openings and progressively expanding through the interstices while expelling air from breather holes, the binder then being cured in the mold either with the tubes still in place or with the tubes removed and the spaces filled with similar aggregate and binder before curing is completed. To prevent aggregate from entering the tubes before pumping of the binder begins, a snug fitting rod can be inserted in each tube at one end, and then the pump can be started to inject liquid binder into the other end of the tube while withdrawing the rod from said one end of the tube at a rate proportional to the rate at which the mold fills with binder. The tubes can be bent to follow curved contours of the mold, and the mold can be evacuated of air while the binder is being infiltrated.

대표청구항 ▼

A process for the internal gating of molds used to prepare a shaped article comprising a composite of aggregate filler and a curable binder, the process comprising the steps of: (a) preparing a mold having multiple surfaces enclosing its cavity, and extending gating tube means into the mold through

A process for the internal gating of molds used to prepare a shaped article comprising a composite of aggregate filler and a curable binder, the process comprising the steps of: (a) preparing a mold having multiple surfaces enclosing its cavity, and extending gating tube means into the mold through at least one of its surfaces, the tube means extending through the mold cavity spaced from its surfaces, at least one surface of the mold having breather holes, and the tube means having walls with multiple openings therethrough which are located inside the mold cavity and distributed throughout the length of the tube means therewithin; (b) filling the cavity of the mold outside of the tube means with aggregate filler packed to close mutual proximity to leave minimum interstitial spaces therebetween; (c) pumping liquid binder into the tube means to cause it to extrude outwardly into the mold cavity through said wall openings to fill said interstitial spaces along a progressively expanding binder front while expelling air from said breather holes; and (d) curing the binder after the cavity is filled therewith.