Spindle lubricator of machine tool, machine tool, and use method of machine tool

A machine tool comprising:

• a machining head comprising:
• a rotation body configured to hold a tool;
• a plurality of bearings comprising a first bearing and a second bearing;
• a housing that supports the rotation body to be rotatable about a first axis via the plurality of bearings;
• and
• a first rotational driver configured to rotate the rotation body about the first axis;
• a fluid mixture supplier configured to supply a fluid mixture containing oil and air to the plurality of bearings;
• a collector configured to collect an oil-containing fluid containing the oil;
• a workpiece holder configured to support a workpiece;
• a mover configured to move the machining head relative to the workpiece holder;
• and
• control circuitry configured to control at least the first rotational driver, the fluid mixture supplier, and the mover,
• wherein the collector comprises
• a plurality of collection flow channels that are disposed in the housing to collect the oil-containing fluid from the plurality of bearings,
• a plurality of ejectors disposed outside the housing, and
• a plurality of flow control valves,
• wherein the plurality of collection flow channels comprise
• a first collection flow channel that is configured to collect a first oil-containing fluid from at least one bearing including the first bearing, and
• a second collection flow channel that is configured to collect a second oil-containing fluid from at least one bearing including the second bearing,
• wherein the plurality of ejectors comprise
• a first ejector that is configured to generate negative pressure due to first air supplied from a first air flow channel and that is configured to suck the first oil-containing fluid from the first collection flow channel, and
• a second ejector that is configured to generate negative pressure due to second air supplied from a second air flow channel and that is configured to suck the second oil-containing fluid from the second collection flow channel, and
• wherein the plurality of flow control valves comprise
• a first flow control valve that is configured to adjust a flow rate of the first air supplied to the first ejector from the first air flow channel, and
• a second flow control valve that is configured to adjust a flow rate of the second air supplied to the second ejector from the second air flow channel.

A spindle lubricator of a machine tool, comprising:

• a rotation body configured to hold a tool;
• a front bearing;
• a rear bearing;
• a housing that supports the rotation body to be rotatable about a first axis via the front bearing and the rear bearing;
• a fluid mixture supplier configured to supply a fluid mixture containing oil and air to the front bearing and the rear bearing;
• and
• a collector configured to collect an oil-containing fluid containing the oil and comprising:
• a first collection flow channel that is provided in the housing and through which a first oil-containing fluid flows from the front bearing;
• a second collection flow channel that is provided in the housing and through which a second oil-containing fluid flows from the rear bearing;
• a first ejector connected to the first collection flow channel and configured to generate negative pressure due to first air supplied from a first air flow channel so as to suck the first oil-containing fluid through the first collection flow channel;
• a second ejector connected to the second collection flow channel and configured to generate negative pressure due to second air supplied from a second air flow channel so as to suck the second oil-containing fluid through the second collection flow channel;
• a first flow control valve provided in the first air flow channel to adjust a flow rate of the first air supplied to the first ejector;
• and
• a second flow control valve provided in the second air flow channel to adjust a flow rate of the second air supplied to the second ejector.