EP 0546210 B1 19971001 - Method and apparatus for heat treating metal castings
Title (en)
Method and apparatus for heat treating metal castings
Title (de)
Verfahren und Vorrichtung zur Wärmebehandlung von Gussstücken
Title (fr)
Procédé et dispositif pour le traitement thermique de pièces coulées
Publication
Application
Priority
US 70562691 A 19910524
Abstract (en)
[origin: EP0546210A1] An improved method and apparatus for heat treating metal castings with sand cores provides for removal of the sand core and recovery of the sand core material for reuse. The method and apparatus eliminate the need for removing the sand core from the casting prior to heat treatment and thus eliminate the labor, expense, and possible damage to the casting incidental to conventional core removal techniques such as chiseling and shaking. The method involves heating the casting with sand core therein to a temperature sufficient to burn off the binder component of the sand core. The sand comprising the sand core is then blown out of the casting by directing a flow of air over the workpiece. The sand thus dislodged is then collected for reuse. According to the disclosed apparatus, the castings are heated in a furnace (11) having fans (44) for directing a flow of air over the workpieces. The sand dislodged from the castings falls into a trough (50) in the lower portion of the furnace, where it is collected and conveyed to a central collection (60) bin for reuse. In another aspect of the disclosed apparatus, the castings are subsequently immersed in a quench tank. The quench tank includes agitation means for agitating water over the castings to dislodge remaining sand. The sand falls to the bottom of the tank, where the sand and a portion of the water are removed from the tank. A major portion of the water is then removed from the sand so that the sand can be reused.
IPC 1-7
IPC 8 full level
B22D 29/00 (2006.01); B22D 29/04 (2006.01); B22D 31/00 (2006.01)
CPC (source: EP)
B22D 29/003 (2013.01); B22D 31/002 (2013.01)
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI
DOCDB simple family (publication)
EP 0546210 A1 19930616; EP 0546210 B1 19971001; EP 0546210 B2 20030709; AU 1906292 A 19921230; AU 4076395 A 19960321; AU 663088 B2 19950928; AU 690776 B2 19980430; BR 9206048 A 19941220; CA 2103136 A1 19921125; CA 2103136 C 19971223; ES 2107438 T3 19971201; ES 2107438 T5 20040401; JP 2620027 B2 19970611; JP 2851574 B2 19990127; JP H06507839 A 19940908; JP H08224656 A 19960903; KR 970005373 B1 19970415; MX 9202441 A 19921101; WO 9220478 A1 19921126
DOCDB simple family (application)
EP 91121229 A 19911211; AU 1906292 A 19920415; AU 4076395 A 19951228; BR 9206048 A 19920415; CA 2103136 A 19920415; ES 91121229 T 19911211; JP 33745095 A 19951225; JP 51088892 A 19920415; KR 930703562 A 19931123; MX 9202441 A 19920522; US 9203079 W 19920415