TAPERED GAUGE FOR HIGH-TEMPERATURE DIE AND METHOD FOR MEASURING LIP CLEARANCE OF HIGH-TEMPERATURE DIE

PURPOSE:To reduce an error of a scale caused by a temperature increase of a gauge to enhance a measuring accuracy by a method wherein a tapered gauge for a high-temperature die is made of metal having a specific thermal expansion coefficient. CONSTITUTION:A gauge 10 is a wedge-form body having two faces which are opposed to each other at a predetermined angle. A front face 11 of the gauge 10 is calibrated at predetermined intervals along the longitudinal direction thereof with respect to a distance between the two faces in the orthogonal direction to the longitudinal direction of the wedge-form body. The front face 11 is calibrated, for example, from 0.6 to 0.85mm in 10mum with respect to a distance between the two faces in the orthogonal direction to the longitudinal direction of the wedge-form body. A support part 12 of the order of 5mm thickness is provided at the base end of the gauge 10. As the material of the gauge 10, a metal having a thermal expansion coefficient of 4X10/ deg.C or less is used. As a result, an error of a lip clearance can be suppressed to the extent that it can be substantially ignored. As the material, for example, an iron-nickel alloy having an FCDLE3 standard listed in JIS-J-5511 is used.