Patent ID: 11945023
Assignee: SINTOKOGIO, LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC B | IPC B

Claim 5:
6. A core molding device for molding a core using a metal mold pressure-fed with mulled sand, the device comprising:
the metal mold for baking the mulled sand;
a pressure-feeding device configured to pressure-feed the mulled sand into the metal mold;
a mold heat controller configured to control a temperature of the metal mold;
a mold temperature sensor configured to measure the temperature of the metal mold;
a control unit connected to the pressure-feeding device, the mold heat controller, and the mold temperature sensor, wherein the control unit is configured to execute:
heating the metal mold using the mold heat controller such that the temperature of the metal mold reaches a temperature higher than a predetermined baking temperature,
pressure-feeding the mulled sand into the heated metal mold using the pressure-feeding device,
holding the temperature of the metal mold having been pressure-fed with the mulled sand at the baking temperature using the mold heat controller and the mold temperature sensor, and
removing the core from the metal mold after the holding; and

a recording unit connected to the mold temperature sensor and the control unit and recording the temperature of the metal mold and a time corresponding to a change in the temperature of the metal mold, wherein:
the control unit is further configured to comprise measuring a first temperature of the metal mold at end of the heating using the mold temperature sensor and recording the first temperature in the recording unit;
the holding using the mold temperature sensor includes measuring an adjustment time taken to change the temperature of the metal mold having been pressure-fed with the mulled sand to the predetermined baking temperature from start of temperature control of the metal mold, and recording the adjustment time in the recording unit;
the heating, the measuring the first temperature, the pressure-feeding, the holding, and the removing are executed sequentially and repeatedly; and
in the heating after the removing, a preliminary temperature of the metal mold is determined based on the first temperature and the adjustment time recorded in the recording unit, and the metal mold is heated using the mold heat controller based on the determined preliminary temperature.