Machine tool having tool rest, control unit, tool storage unit, tool changing unit, and tool management unit
In a case of attaching a plurality of tools of the same type to a tool rest, machining work is continued even when a sufficient number of normal tools are not left. A machine tool includes a tool rest including a first holder for an inner-diameter side and a second holder for an outer-diameter side, a machining control unit configured to control the tool rest to machine the workpiece, a tool changing unit configured to change tools, and a tool management unit configured to identify an unused tool. In a case of attaching a plurality of tools of the same type to both the first and second holders, when the number of the first holders is larger than the number of the second holders, the tool changing unit attaches the unused tool to the first holder.
1 . A machine tool comprising:
a tool rest including: (i) a plurality of first holders each configured to hold a respective tool for cutting an inner-diameter side portion of a workpiece, and (ii) a plurality of second holders each configured to hold a respective tool for cutting an outer-diameter side portion of a workpiece;
a machining control unit configured to control a tool held by the tool rest to machine a workpiece in accordance with a machining program;
a tool storage unit capable of storing a plurality of tools therein;
a tool changing unit configured to change one of the tools held by the tool rest with one of the tools stored in the tool storage unit; and
a tool management unit configured to identify an unusable tool in the tools stored in the tool storage unit, the unusable tool being a tool that cannot be used to perform machining, wherein
in a case where the machining program utilizes a plurality of tools of a same first type, which plurality of tools of the first type includes tools that are to be attached to ones of the first holders, and which plurality of tools of the first type also includes a tool that is to be attached to a respective one of the second holders, and when the tools of the first type include the unusable tool and, when the ones of the first holders and the one of the second holders to which the tools of the first type are to be attached have a quantity of the first holders that is larger than the quantity of the second holders, the machining control unit causes the tool changing unit to attach the unusable tool to one of the first holders.
2 . The machine tool according to claim 1 , wherein, when the plurality of tools stored in the tool storage unit includes a usable tool of the first type, the tool changing unit selects the usable tool in the tool storage unit as a target of tool change.
3 . The machine tool according to claim 2 , wherein the tool changing unit removes the unusable tool from the tool storage unit and attaches the unusable tool to the one of the first holders under a condition that enough usable tools of the first type for a planned number of tool changes between the tool storage unit and the tool rest are not stored in the tool storage unit.
4 . A machine tool comprising:
a tool rest including: (i) a plurality of first holders each configured to allow a respective shank portion of a respective tool to be inserted thereinto in a first direction to hold the respective tool, and (ii) a plurality of second holders each configured to allow a respective shank portion of a respective tool to be inserted thereinto in a second direction different from the first direction to hold the respective tool;
a machining control unit configured to control a tool held by the tool rest to machine a workpiece in accordance with a machining program;
a tool storage unit capable of storing a plurality of tools therein;
a tool changing unit configured to change one of the tools held by the tool rest with one of the tools stored in the tool storage unit; and
a tool management unit configured to identify an unusable tool in the tools stored in the tool storage unit, the unusable tool being a tool that cannot be used to perform machining, wherein
in a case where the machining program utilizes a plurality of tools of a same first type, which plurality of tools of the first type includes tools that are to be attached to ones of the first holders, and which plurality of tools of the first type also includes a tool that is to be attached to a respective one of the second holders, and when the tools of the first type include the unusable tool and, when the ones of the first holders and the one of the second holders to which the tools of the first type are to be attached have a quantity of the first holders that is larger than a quantity of the second holders, machining control unit causes the tool changing unit to attach the unusable tool to one of the first holders.
5 . The machine tool according to claim 4 , wherein
the first direction is one of a radial direction and an axial direction of the tool rest, and
the second direction is the other of the radial direction and the axial direction of the tool rest.