Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1985-05-17
1987-03-03
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51423, 51322, B24C 304
Patent
active
046464840
ABSTRACT:
A closed recirculation cryogen shot blast deflashing apparatus includes an upstanding frame which movably supports a receptacle assembly including an enclosure having a housing enshrouding a rotatable drum, and a door thereon pivotable between positions wherein the door selectively opens and closes an open outer end of the drum. A throwing wheel is carried on the door for discharging particulate media and cryogen gas into the drum for impacting workpieces and embrittling workpiece flash. A recirculation system is provided for withdrawing cryogen gas and particulates from the drum during operation of the machine, for separating reusable particulate media from particles of waste material, and for returning a controlled flow of pressurized cryogen gas and particulate media to the throwing wheel, including a blower for recirculating cryogen gas to the throwing wheel from the drum by evacuating cryogen from the drum through a return conduit, and by redelivering pressurized cryogen to the throwing wheel through a supply conduit, whereby the blower cooperates with the throwing wheel to establish the desired high velocity flow of cryogen gas through the drum. A purging system introduces an inert gas such as nitrogen at spaced locations throughout the closed system of the deflashing apparatus to purge the apparatus of ambient air before cryogen introduction is begun, and to maintain a positive pressure inert atmosphere throughout the apparatus to inhibit entry of moisture laden ambient air.
REFERENCES:
patent: 3432968 (1969-03-01), Croft et al.
patent: 3824739 (1974-07-01), Monet et al.
patent: 4519812 (1985-05-01), Brull et al.
patent: 4524548 (1985-06-01), Klee et al.
AGA AB
Burge David A.
Rose Robert A.
Schmidt Frederick R.
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