| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for assessing wear whereby the wear status can be determined without the need to take out a screw in the assembly of an injection molding machine. <P>SOLUTION: A first chromium mass concentration C and a first reference mass concentration A are extracted from a first test substance made by adding a predetermined amount of calcium to a predetermined amount of pellets, which are a raw material for molding a molded body; a reference value X is calculated on the basis thereof. A second chromium mass concentration C' and a second reference mass concentration A' are extracted from a second test substance made by adding, to a predetermined amount of the substance contained in the molded body, an amount of calcium identical to the amount added to the pellets; a comparative value X' is calculated on the basis thereof. A screw 3 can be determined to have wear whenever the comparative value X' is not less than a numerical value 60 times that of the reference value X, whereas the screw 3 can be determined not to have wear whenever the comparative value is less than a numerical value 60 times that of the reference value X; it is therefore possible to determine and assess wear without the need to confirm by taking out the screw 3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
