Wax injection molding machine used for lost wax casting and injection nozzle

摘要

An injection nozzle 30 for a wax injection molding machine capable of preventing falling off / misalignment of a seal member 35 for sealing the exhaust passage 33 c and / or improving sealing properties is disclosed. The injection nozzle 30 includes an outer cylinder 31, an inner cylinder 32 movable in the longitudinal direction, a wax passage 33 d defined by the inner wall of the inner cylinder 32 and communicating with the inner cylinder opening 33 b at the front end of the inner cylinder 32, An exhaust flow path 33 c that is defined between the inner wall of the outer cylinder 31 and the outer wall of the inner cylinder 32 and communicates with the outer cylinder opening 33 a at the front end of the outer cylinder 31, a wax valve that opens and closes the wax flow path 33 d , And an exhaust valve for opening and closing the exhaust flow path 33 c, the outer cylinder 31 has a small inner diameter portion 31 a in which the outer cylinder opening 33 a is formed, and the inner cylinder 32 is formed such that the inner cylinder opening 33 b A small outer diameter portion 32a formed, and an outer surface tapered portion 32b whose outer diameter increases toward the rear from the small outer diameter portion 32a, the exhaust valve has a seal member fitted to the outer surface tapered portion 32b 35.