| 摘要 |
PURPOSE:To improve the quality and accuracy of a product by squeezing the whole periphery of a part of a pipe body in the diameter direction, deforming it plastically, and also forming a small hole for controlling a flow rate in its inside. CONSTITUTION:An upper die 8 is fixed to a piston 11, and also a pipe body 5 is squeezed and formed between its die surface 8a and a die surface 7a of a lower die 7, and a small hole for controlling a flow rate is formed. In this case, a fluid is supplied into the pipe body 5, the flow rate is measured by a measuring means 16, and based on its measured value, a working pressure of a squeezing piston 11 is made constant, or a working quantity of the upper die 8 is controlled. According to this method, in the small hole for controlling the flow rate, a working burr, etc. are not generated, and the quality of a product is improved. Also, since the squeezing quantity is controlled exactly, the accuracy of the product is also improved. |
