System and method for forming oil mist in machining apparatus

A system for forming an oil mist for lubrication machining in a machining apparatus, the system comprising:

• a cooled oil storage device configured to store and maintain an oil for lubrication and cooling at a preset temperature;
• an oil supply line which is connected to the cooled oil storage device and heat-insulated and configured to supply the oil from the cooled oil storage device therethrough;
• an indirect cooling device configured to form an indirect cooling air of a first temperature less than the preset temperature, and to indirectly cool the oil supply line to the first temperature;
• an oil nozzle configured to form the oil mist by injecting the oil of the first temperature supplied from the cooled oil storage device through the oil supply line;
• and
• a direct cooling device configured to form a direct cooling air of a second temperature lower than the first temperature, and to mix and inject the oil mist and the direct cooling air,
• wherein cooling of the indirect cooling device and cooling of the direct cooling device are separate from each other so that the oil for lubrication and cooling is cooled by the indirect cooling device prior to the direct cooling device and then further cooled by the direct cooling device.