Forming tools for converting glass tubes into glass articles

A forming tool for use during a process of converting a glass tube into a glass container, the forming tool comprising:

• a base portion comprising a fluid cavity for containing a fluid;
• an insertion portion extending from the base portion, the insertion portion comprising an external surface sized to fit into an opening of the glass tube;
• a thermally conductive insert extending through the base portion and the insertion portion, wherein the thermally conductive insert comprises a linear portion extending through the insertion portion and a coiled portion disposed in the base portion the thermally conductive insert and having a thermal conductivity that is greater than that of a material out of which the insertion portion is formed, the thermally conductive insert extending through the fluid cavity, a coolant circulating through the fluid cavity such that the coolant regulates a temperature of the thermally conductive insert, wherein a central axis of the forming tool extends through at least a portion of the thermally conductive insert;
• and
• a coolant source;
• a coolant inlet in fluid communication with the coolant source and the fluid cavity;
• a coolant outlet on the external surface of the insertion portion, wherein coolant from the coolant source enters the fluid cavity via the coolant inlet, circulates around the thermally conductive insert, and exits the forming tool via the coolant outlet to remove heat from the forming tool;
• and
• the coolant comprises a lubricant forming a film between the insertion portion and the glass tube.