Machine tool
AssigneeFanuc Corporation
InventorGaku ISOBE
Life of this patent
Estimating the term…
Abstract
In a machine tool in which a spindle head is driven by a spindle head drive motor via a ball screw/nut mechanism, tools of different weights are each installed in the spindle head beforehand, a load torque applied to the spindle head drive motor is obtained, and relational data between the tool weight and the load torque is stored. When each tool is installed in the spindle head, the weight of the tool is estimated from, the load torque detected by a load torque detection unit while the spindle head is stopped, and the relational data between the tool weight and load torque.
Claims10
A machine tool with a spindle head to/from which a tool can be attached/detached and a spindle head drive motor for driving the spindle head,
- the machine tool comprising:
- a load torque detection unit configured to detect a load torque applied to the spindle head drive motor;
- a data storage unit configured to obtain beforehand a relationship between a weight of a tool installed in the spindle head and a load torque that is applied to the spindle head drive motor under a predetermined drive condition, with respect to a plurality of objects of different weights, and store the relationship as relational data between weights of installed objects and load torques;
- and
- a tool weight estimation unit configured to detect a load torque of the spindle head drive motor under the predetermined driving condition when the tool is installed in the spindle head using the load torque detection unit, and estimate the weight of the tool installed in the spindle head based on the detected load torque and the relational data between weights of installed objects and load torques which are stored in the data storage unit.
A machine tool including a spindle head to/from which a tool configured to be attached/detached and a spindle head drive motor configured to drive the spindle head, the machine tool comprising:
- a load torque detection unit configured to detect a load torque applied to the spindle head drive motor;
- and
- a tool weight estimation unit configured to, in use of a relational expression between a weight of a tool installed in the spindle head and a load torque applied to the spindle head drive motor under a predetermined driving condition and on the basis of the load torque detected by the load torque detection unit under the predetermined driving condition, calculate and estimate the weight of the tool installed in the spindle head.
Dependencies are inferred from the claim text.