Deep hole punching method and deep hole punch head thereof for large forging
A large forging and deep hole technology, applied in the field of forging, can solve the problems of complex machining process, stress concentration, long production cycle, etc., and achieve the goal of eliminating internal structure defects, reducing stamping force and homogenizing internal structure Effect
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[0031] Take a straight-through pipe section of an ultra-supercritical generator set as an example. The finished straight-through pipe section has an outer diameter of 566mm, a length of 3200mm, a diameter of 302mm, a pipe wall thickness of 132mm, and a length-to-diameter ratio of the pipe hole of 10.6. Eight prism-shaped forged steel ingots are used, and the ingot material is martensitic heat-resistant steel P112.
[0032]Firstly, the steel ingot is heated in stages. First, the forged steel ingot is put into the heating furnace for heating, so as to improve the metal plasticity, make it easy to flow and form and obtain a good after-forging structure. Molded in a state of good plasticity. Since the steel ingot is a large piece, in order to reduce the temperature stress caused by the temperature difference of the section, the steel ingot should be heated and heated evenly. The present invention adopts the seven-stage heating and temperature rise specification. The temperature i...
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