| 摘要 |
PROBLEM TO BE SOLVED: To work an object to be worked uniformly and without unevenness, even if the object to be worked is carried at high speed, by forming an abrasive material straightening part into a continuously symmetrical cross section shape including an abrasive material injection port constantly forming a cross section shape up to a length of ten times or more as long as a short side or a short diameter. SOLUTION: In a state that an abrasive material and high pressure air are mixed, mixed fluid of the abrasive material and compressed air is forcibly fed from an abrasive material hose 33 to a diffusion nozzle 51 of a cross section shape. The abrasive material forcibly fed to the diffusion nozzle 51 is diffused in an abrasive material diffusion part 52a forming an abrasive material diffusion chamber 52 in space within this nozzle 51. The diffused abrasive material enters an abrasive material strengthening part 52b of a trapezoidal shape in cross section, is accelerated by high pressure air and is jetted. The abrasive material strengthening part 52b is formed into a continuously symmetrical cross section shape including an abrasive material injection port in which a long side has a narrow width of 10 times or more as long as a short side or a short diameter and a cross section shape in a thin and long cross section shape is formed constantly up to a length of 10 times or more as long as the short side, and a short side forms an end edge to be a further short side at both ends of the longitudinal direction.
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