| 摘要 |
PROBLEM TO BE SOLVED: To provide a service life duration determination method for a blast medium, which determines the service life duration of the sponge piece conditioned blast medium in which grinding material is included in a porous elastic body. SOLUTION: During operation of a sponge blast supply device 50, the blast medium 26 for which grinding process is performed is recovered by grain size measuring instrument 56 from a suction opening 60 through a suction machine 54. Besides, the grain size of the grinding material 22 in the blast medium 26 is measured by the grain size measuring instrument 56 to prepare grain size distribution. A peak value of the grain size distribution after one usage is b, and the blast medium 26 of the rod is determined to be reusable because of b>D against the usage limit diameter D. The grain size of the blast medium 26 used for the second grinding is measured by the grain size measuring instrument 56, and the grain size distribution is prepared. The peak value of the grain size distribution after second usage is c, and the blast medium 26 of the rod is determined to be unreusable because of c<D against the usage limit diameter D. COPYRIGHT: (C)2006,JPO&NCIPI
|
