Autoclave for dewaxing mold for lost wax casting

A process for dewaxing a mold for use in lost wax casting is proposed, wherein the mold is loaded on a pallet which is placed and then securely held on a carrier which is rotatably assembled in a dewaxing tank. The mold is inverted to be ready for dewaxing within the tank and then returned to the initial condition within the tank by rotating the carrier by about 180 degrees at a time.

An autoclave for use in the process comprises a carrier framework rotatably disposed within a dewaxing tank for carrying a pallet loaded with shell mold trees. The carrier framework is held in a first position for assembling the pallet and then is rotated by about 180 degrees to a second inverted position to hold the pallet securely in the inverted condition during the dewaxing operation.

A preferred embodiment of the autoclave further comprises means for securely fastening the pallet and the mold trees automatically and simultaneously with the operation of sealingly closing the entrance opening of the dewaxing tank.

1. A process for dewaxing a mold for use in lost wax casting, comprising the steps of securely loading said mold on a pallet, placing said pallet on a carrier rotatably assembled in a dewaxing tank, securely holding said pallet and said mold on said carrier while within said dewaxing tank by means operative responsive to a closing of a door on said dewaxing tank, rotating said carrier by about 180 degrees to invert said mold to an upside down position, charging superheated steam into said dewaxing tank to melt the wax after said dewaxing tank is closed, rotating said carrier by about 180 degrees to return said carrier to the initial condition, and releasing said pallet and said mold from said carrier responsive to an opening of said door to remove said mold from said dewaxing tank.

2. An autoclave for dewaxing a mold used for lost wax casting, comprising a dewaxing tank for containing high temperature steam, said tank having a door sealingly closing said tank, a carrier framework disposed within said dewaxing tank to be rotated about a substantially horizontal axis by at least about 180 degrees from a first position to a second inverted position, and a pallet for carrying thereon said mold, said carrier framework comprising a pair of opposing wheels rotatably supported by bearing means, drive means for rotating said pair of opposing wheels, guide rails extending between said opposing wheels for guiding and holding said pallet, and a perforated cover plate for fastening said mold to said pallet, a cooperative means operative responsive to closing and opening said door for securing said pallet and mold while in said tank and for releasing said pallet and mold for removal from said tank, and means for injecting superheated steam into said dewaxing tank, said pallet being assembled with and disassembled from said carrier framework when the latter is in said first position, and said carrier framework being arranged to rotate to said second inverted position while holding said pallet securely in the inverted condition during the dewaxing operation.

3. The autoclave according to claim 2, wherein said cooperative means moves said perforated cover plate from an upper retracted position to a lower fastening position simultaneously with the operation of sealingly closing said dewaxing tank.

4. The autoclave according to claim 3, wherein said cooperative means comprises brackets for suspending said perforated cover plate and each having a pin, fixed crossbeams extending between said opposing wheels and each having at least one substantially vertical guide slot for receiving said pin, slider plates each having at least one inclined guide slot for receiving said pin, each pin of said bracket means being guided by said substantially vertical guide slot of said fixed crossbeam and by said inclined guide slot of said slider plate, and a push rod secured to said slider plates and biased by spring means to an extended position under released condition and adapted to be engaged by the closure lid of said dewaxing tank to be moved to a push-in position whereby said pin guided by said slots is moved upwards to raise said perforated cover plate to said upper retracted position.

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