| 摘要 |
PROBLEM TO BE SOLVED: To provide a tubular member capable of guaranteeing a smooth flow of fluid, by eliminating a part apt to become a barrier of the flow of the fluid in a pipe, in a tubular member molded by using a split type core.SOLUTION: A tubular member 10 comprises a first inside flow passage molded by a first core 3a and a second inside flow passage molded by a second core 3b, and the second inside flow passage is formed in a larger diameter than the first inside flow passage by forming the second core 3b in a larger diameter than the first core 3a, and a step difference part 3d of not becoming a barrier to the flow direction of the fluid, is formed between the first inside flow passage and the second inside flow passage.SELECTED DRAWING: Figure 3 |
