Angled tip rods
A core is provided for fabricating a blade to include an airfoil. The airfoil includes pressure and suction surfaces, leading and trailing edges extending along the pressure and suction surfaces and a tip shelf with a first sweep configuration and a wall. The core includes channel sections configured to form internal channels within the airfoil by casting processes and tip rods extending from respective portions of the channel sections proximate to a tip shelf location. The respective portions of the channel sections have a second sweep configuration corresponding to the first sweep configuration. The tip rods are configured to extend through the wall at an angle of about 5-12 degrees inclusive relative to a normal angle of the wall during the casting processes to form through-holes angled at about 5-12 degrees inclusive in the wall.
1. A core for fabricating a blade to comprise an airfoil, the airfoil comprising pressure and suction surfaces, leading and trailing edges extending along the pressure and suction surfaces and a tip shelf with a first sweep configuration and a wall, the core comprising:
channel sections configured to form internal channels within the airfoil by casting processes; and
tip rods extending from respective portions of the channel sections proximate to a tip shelf location,
wherein the respective portions of the channel sections having a second sweep configuration corresponding to the first sweep configuration and the tip rods being configured to extend through the wall at an angle of about 5-12 degrees inclusive relative to a normal angle of the wall during the casting processes to form through-holes angled at about 5-12 degrees inclusive in the wall.
2. The core according to claim 1 , wherein the tip rods comprise at least one or more of alumina and quartz.
3. The core according to claim 1 , wherein the angle is 5 degrees relative to the normal angle of the wall.
4. The core according to claim 1 , wherein the channel sections comprise a bumper proximate to an internal end of at least one of the tip rods.
5. The core according to claim 1 , further comprising a plenum body to which external ends of the tip rods are coupled.