| 摘要 |
PROBLEM TO BE SOLVED: To provide a nozzle for blast with which blasting can be applied to the surface of a workpiece, an attached substance such as core sand adhered to a hole inner wall face of a hole of the workpiece can be peeled and removed in short period of time.SOLUTION: The nozzle for blast which blasts a mixed blast material of a projection material and compressed air toward a workpiece, is a direct blasting nozzle 20 which blasts the mixed blast material from a blasting port 20c opened at the tip of the nozzle toward an extension direction of the nozzle. A body passage 20a which is formed in a body part of the nozzle and through which the mixed blast material passes, is connected to a small diameter passage 20b which is formed in the tip part of the nozzle and continuously formed in the rear end direction with the same inner diameter as a bore diameter of a small diameter blasting port 20c from the blasting port 20c with a smaller bore diameter than an inner diameter of the body passage 20a, wall surface thickness of the small diameter passage 20b is thicker than wall surface thickness of the body passage 20a, and level difference 20d is formed at a connection part between the small diameter passage 20b and the body passage 20a. |
