Patent ID: 11919124
Assignee: EBARA CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G  H | IPC B

Claim 9:
10. A pad-temperature regulating method, comprising:
flowing a heating liquid and a cooling liquid into a heating flow channel and a cooling flow channel formed in a pad contact member, while the pad contact member is placed in contact with a surface of a polishing pad;
measuring a temperature of the surface of the polishing pad;
performing a PID control of manipulated variables of a first flow control valve attached to a heating-liquid supply pipe which is coupled to the heating flow channel, and a second flow control valve attached to a cooling-liquid supply pipe which is coupled to the cooling flow channel such that the temperature of the surface of the polishing pad reach a predetermined target temperature and is subsequently maintained at the target temperature;
constructing a learned model, by use of machine learning, a learned model for maintaining a temperature behavior curve, which is created based on measured values of the pad temperature measuring device and measurement time points thereof, and which represents a temporal change in the temperature of the surface of the polishing pad from a time point when the pad contact member starts regulating of the temperature of the surface of the polishing pad to a time point when the target temperature is reached, within a predetermined allowable range; and
inputting at least one temperature behavior parameter to the learned model and outputting the change value of a PID parameter of the PID control.