Device and method for cooling and lubricating tools in machining processes

A method of operating a device for cooling and lubricating a tool during a chip removal machining process, comprising said device a first subsystem for cryogenic cooling, comprising:

• a first entry configured to introduce CO2 in liquid state in a first conduit of the device;
• a first exit configured to supply CO2 in liquid state from a second conduit of the device;
• a third conduit located between said first and second conduit;
• and means for preventing the formation of dry ice in said first, second and third conduits;
• and a second subsystem for lubrication, comprising means for supplying micro-particles of a cutting oil in liquid state;
• wherein said means for preventing the formation of dry ice comprise means for pressurizing said first, second and third conduits above the triple point of the CO2, wherein said means for pressurizing said conduits comprising:
• a second entry configured to introduce CO2 in gaseous state in a fourth conduit of the device;
• a fifth conduit located after said fourth conduit;
• a first solenoid valve configured to control the passage of CO2 in liquid state between the first conduit and the third conduit;
• a second solenoid valve configured to control the passage of CO2 in gaseous state between the fifth conduit and a sixth conduit;
• a first no-return valve placed to communicate said first conduit and third conduit;
• and a second no-return valve placed to communicate said third conduit and sixth conduit;
• and wherein said means for supplying micro-particles of a cutting oil in liquid state comprise:
• a third entry configured to introduce pressurizing air into a seventh conduit of the device;
• a tank configured to supply cutting oil in liquid state through an eighth conduit;
• a third solenoid valve configured to control the passage of pressurized air in the seventh conduit;
• a fourth solenoid valve for controlling the passage of cutting oil in the eighth conduit;
• a coupling designed to join said seventh conduit and eighth conduit in a single ninth conduit, and a nozzle placed at the output end of said ninth conduit, said nozzle being configured to pulverize the cutting oil by the Venturi effect so it can be injected,
• the method comprising the following stages for the injection of CO2 in liquid state through the coupling:
• opening the second solenoid valve to control the passage of CO2 in gaseous state between the fifth conduit and the sixth conduit;
• pressurizing the first, second and third conduits above the triple point of the CO2;
• opening the first solenoid valve that controls the passage of CO2 in liquid state between the first conduit and the third conduit;
• injecting CO2 in liquid state through the first exit.