• CN: 11-2187/TH
  • ISSN: 0577-6686

›› 2011, Vol. 47 ›› Issue (16): 61-66.

• Article • Previous Articles     Next Articles

Research on New JTS Method and Its Process Parameters

REN Yunlai;ZHANG Jianguo;YANG Xiaoyu;NIE Shaomin   

  1. School of Mechanical Engineering, Yanshan University CFHI Tianjin Heavy Industry Co., Ltd.
  • Published:2011-08-20

Abstract: Aiming at the disadvantages of complex process operation and large tonnage requirement of equipment in the existing center-pressure method, i.e. JTS (Japan-Tefeno-Shikano) method, for large forgings, NJTS method, i.e. a new center-pressure method for large forgings, is proposed. The tools applicable to the production are designed. The loads may be applied on the forging billet from top, bottom, left, and right, directions. The billet with a preset cavity in the center is taken as the research object, the new center-pressure forging process is investigated by using the numerical simulation method and the physical simulation method. The result shows that large hydrostatic pressure over the whole cross section of the forging can be produced and the maximum deformation in the centre of the ingot is obtained by applying the new method. The optimal main process parameters such as the relative reduction, the anvil width ratio and the lateral pressure angle, are selected, when the anvil width ratio is1 and the lateral pressure angle is 10°, the forging effect of the NJTS (New-Japan-Tefeno-Shikano) method is at its best, simultaneously optimum volume change rate of cavities, surrounding equivalent strain and stress triaxiality may be obtained as well. The internal cavities can be consolidated when the relative reduction is 18%~20% with unidirectional compaction or the relative reduction is 8%~9% with bidirectional compaction, The results from physical simulation are basically in agreement with those from the numerical simulation.

Key words: Cavity closure, Forging, JTS method, Large forgings

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