Tooling for machining systems utilizing supercritical fluids
Improvements in tooling for machining systems that utilize machining fluids comprising a supercritical fluid are disclosed. In some embodiments a tool may include a plurality of orifices configured to direct a supercritical machining fluid towards a cutting interface of the tool. In other embodiments, a tool holder may include one or more outlets configured to direct a supercritical machining fluid towards a cutting interface. Moreover, some embodiments, may relate to machining systems including one or more venting channels configured to provide pressure relief for a cavity located behind a tool holder. Embodiments related to machine tools including upstream fluid restrictions for controlling a flow of supercritical machining fluid through a tool are also disclosed.
1 . A machining method comprising:
flowing a supercritical machining fluid through a flow restriction of a tool body into a fluid channel of the tool body;
expanding the supercritical machining fluid in the fluid channel; and
flowing the expanded supercritical machining fluid though one or more orifices formed on an outer surface of the tool body, wherein a flow resistance of the one or more orifices and the fluid channel is less than a flow resistance of the flow restriction.
2 . The method of claim 1 , wherein the one or more orifices are a plurality of orifices, wherein at least a portion of the plurality of orifices are formed within a plurality of grooves, and wherein the grooves separate a plurality of flutes located at a distal portion of the tool body.
3 . The method of claim 1 , further comprising directing the expanded supercritical machining fluid out of the one or more orifices in a first direction at least partially parallel to a longitudinal axis of the tool body.
4 . The method of claim 1 , further comprising directing the expanded supercritical machining fluid out of the one or more orifices towards a cutting interface between the tool body and a workpiece.
5 . The method of claim 1 , wherein the supercritical machining fluid comprises supercritical carbon dioxide.
6 . The method of claim 1 , wherein each orifice of the one or more orifices has a diameter between about 50 microns and about 500 microns.
7 . The method of claim 1 , wherein a ratio of a flow resistance of the flow restriction and a combined flow resistance of the fluid channel and one or more orifices is greater than or equal to 4.
8 . The method of claim 1 , wherein flowing the supercritical machining fluid through the restriction comprises flowing the supercritical fluid through an insert to the tool body wherein the insert comprises the flow restriction.
9 . The method of claim 1 , wherein the flow restriction is upstream from and in fluid communication with the fluid channel.
10 . The method of claim 1 , wherein at least one of the one or more orifices is formed in a recess formed along an outer surface of the tool body, and at least some of the supercritical machining fluid is flowed through the recess via the at least one orifice formed in the recess.
11 . The method of claim 1 , wherein at least one orifice of the one or more orifices is located on a side surface of the tool body.
12 . The method of claim 1 , further comprising directing at least some of the expanded supercritical machining fluid out of a first orifice of the one or more orifices in a direction perpendicular to a surface of the tool body in which the first orifice is formed.
13 . The method of claim 1 , wherein the one or more orifices are formed in one or more planar surfaces formed on an outer surface of the tool body.
14 . The method of claim 13 , wherein at least some of the planar surfaces are normal to a longitudinal axis of the tool body and/or a direction oriented towards a cutting interface of the tool body.
15 . A machining system comprising:
a tool holder constructed and arranged to receive a tool and secure the tool within the tool holder, wherein the tool is configured to deliver a supercritical machining fluid to a cutting interface through the tool; and
a spindle constructed and arranged to receive the tool holder, wherein a cavity formed between the tool holder and the spindle is in fluid communication with an exterior of the machining system; the machining system further comprising:
a tool secured within the tool holder, the tool comprising:
a tool body;
a flow restriction in the tool body, wherein the flow restriction is upstream from and in fluid communication with a fluid channel; and
one or more orifices in fluid communication with the fluid channel, wherein a first orifice of the one or more orifices is configured to direct supercritical machining fluid out of the first orifice along a first direction;
wherein the flow restriction is configured to expand the supercritical machining fluid as it flows through the flow restriction.
16 . The machining system of claim 15 , wherein the spindle comprises one or more venting channels extending between the cavity and an exterior of the spindle.
17 . The machining system of claim 15 , wherein the tool holder comprises one or more venting channels extending between the cavity and an exterior of the tool holder.
18 . The machining system of claim 15 , wherein the supercritical machining fluid comprises supercritical carbon dioxide.
19 . The machining system of claim 15 , wherein the one or more orifices are configured to expand the supercritical machining fluid out of the one or more orifices in a first direction substantially parallel to a longitudinal axis of a tool body of the tool.
20 . The machining system of claim 15 , wherein the orifices are configured to direct the expanded supercritical machining fluid out of the one or more orifices towards a cutting interface.
21 . The machining system of claim 15 , wherein the supercritical machining fluid comprises supercritical carbon dioxide.
22 . The machining system of claim 15 , wherein each orifice of the one or more orifices has a diameter between about 50 microns and about 500 microns.
23 . The machining system of claim 15 , wherein a ratio of a flow resistance of the flow restriction and a combined flow resistance of the fluid channel and one or more orifices is greater than or equal to 4.