Casting method with improved resin core removing step and apparatus for performing the method

A method of manufacturing a cast product, said method comprising the steps of:

• (a) disposing a resin core:
• (i) having a high glass transition point;
• (ii) having a plurality of core prints and at least one fragile portion formed between each two adjacent ones of the plurality of core prints;
• (iii) in a non-deformable state;
• and
• (iv) within a die;
• (b) filling the die with molten metal, thereby causing the resin core:
• (i) to absorb heat from the molten metal and
• (ii) to achieve a deformable state due to the heat of the molten metal;
• and
• (c) withdrawing the resin core:
• (i) in the deformable state;
• (ii) after the molten metal has solidified to form the cast product.

A method of manufacturing a cast product, said method comprising the steps of:

• (a) disposing a resin core:
• (i) having a high glass transition point;
• (ii) in a non-deformable state;
• (iii) within a die;
• and
• (iv) which comprises movable cast product set pins;
• (b) filling the die with molten metal, thereby causing the resin core:
• (i) to absorb heat from the molten metal and
• (ii) to achieve a deformable state due to the heat of the molten metal;
• (c) causing the movable cast product set pins to project into the die during the filling step;
• and
• (d) withdrawing the resin core:
• (i) in the deformable state;
• (ii) while the movable cast product set pins project into the die;
• and
• (iii) after the molten metal has solidified to form the cast product.

A method of manufacturing a cast product, said method comprising the steps of:

• (a) disposing a resin core:
• (i) having a high glass transition point;
• (ii) in a non-deformable state;
• and
• (iii) within a die;
• (b) filling the die with molten metal, thereby causing the resin core:
• (i) to absorb heat from the molten metal and
• (ii) to achieve a deformable state due to the heat of the molten metal;
• and
• (c) applying a continuous pulling force to the resin core while the resin core is being heated, thereby permitting the resin core to be withdrawn from the cast product at the tine that the resin core transitions from the non-deformable state to the deformable state.