| 摘要 |
PURPOSE:To improve the responsiveness of a thermocouple and to reduce the cost of a casting mold by filling a thermocouple insertion hole with a plug as necessary and controlling the thickness from a temp. measuring position to the surface of the casting mold in a specified range. CONSTITUTION:The thermocouple insertion hole 2 is so provided that the thickness from the surface 1a of the casting mold to the temp. measuring position attains the prescribed length of an upper limit value to permit the exact temp. monitoring in the stage of staring the use of the casting mold 1. The thermocouple 3 is inserted into such hole 2 and the surface temp. of the mold 1 is measured. The surface of the mold 1 is reconditioned by machining the surface by as much as the machining width when the mold 1 wears. The plug 4 made of the same material as the material of the mold 1 is embedded and fixed from the surface 1a of the mold into the hole 2 to fill the hole so that the thickness attains the prescribed length simultaneously when the 4th machining is executed after the lower limit value is attained by 3 times of machining. The surface is thereafter machined as necessary and the lower limit value is attained again by total 7 times of machining and therefore the plug 4 is further embedded into the hole 2 to fill the same at the same instant of the 8th machining. The thickness in the stage of discarding is attained after total 10 times of machining and the mold is discarded at the point of the time when the need for the 11th machining arises. |
