US 9,808,861 B2
Process and apparatus for casting titanium aluminide components
Wolfgang Schneider, Odernheim (DE); and Frank Scherrer, Frankenthal (DE)
Assigned to BorgWarner Inc., Auburn Hills, MI (US)
Appl. No. 14/787,284
Filed by BorgWarner Inc., Auburn Hills, MI (US)
PCT Filed Apr. 30, 2014, PCT No. PCT/US2014/036026
§ 371(c)(1), (2) Date Oct. 27, 2015,
PCT Pub. No. WO2015/020704, PCT Pub. Date Feb. 12, 2015.
Claims priority of application No. 10 2013 007 958 (DE), filed on May 8, 2013.
Prior Publication US 2016/0129499 A1, May 12, 2016
Int. Cl. B22D 18/02 (2006.01); B22D 21/00 (2006.01)
CPC B22D 18/02 (2013.01) [B22D 21/005 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process for casting TiAl components, comprising the following process steps:
producing a melt (S) of a TiAl material below an inert gas fill (IF);
placing a casting mold (1) on a gate (2) in a gastight manner;
flooding the casting mold (1) with inert gas (IG) by opening a closure mechanism (7) which is arranged at the gate (2) and is connected to an inert gas source (8);
pressing the melt (S) through the gate (2) into the casting mold (1) by increasing the pressure (P) of the inert gas fill (IF) above the melt (S) while at the same time evacuating the inert gas (IG) from the casting mold (1), and
stopping the inflow of inert gas (IG) as soon as it is determined that the melt (S) passes above the position of the closure mechanism (7).
 
9. An apparatus (12) for casting TiAl components, comprising
a melting crucible (5);
a riser (4), which connects the melting crucible (5) to a gate (2); and
a casting mold (1) which can be placed on the top of the gate (2),
wherein an openable and closable closure mechanism (7) is arranged at the gate (2), and
wherein the closure mechanism (7) is fluidically connected to an inert gas source (8) via a connection line (11).