大型锻件锻造新中心压实法及工艺参数研究  

Research on New JTS Method and Its Process Parameters

作　　者：任运来[1] 张建国[2] 杨晓禹[2] 聂绍珉[1] 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004 [2]中国一重天津重型装备工程研究有限公司,天津300457

出　　处：《机械工程学报》2011年第16期61-66,共6页Journal of Mechanical Engineering

基　　金：上海市教育委员会重点学科建设资助项目(J51902)

摘　　要：针对现有大锻件中心压实(Japan-Tefeno-Shikano,JTS)法工艺操作复杂且对设备吨位要求过大的缺点,提出一种新的大锻件中心压实方法——NJTS(New-Japan-Tefeno-Shikano)法,设计可用于生产的工装,在锻坯上、下、左、右四个方向同时施压。利用数值模拟与物理模拟方法,以在心部预置空洞的坯料为研究对象,对新中心压实法锻造工艺进行研究。结果表明,新中心压实法能在整个横截面上形成大的静水压力,在心部有最大的变形。对相对压下量、砧宽比和侧压角等主要工艺参数进行优选,在砧宽比为1、侧压角为10°时,NJTS法的锻造效果最好,空洞的体积变化率、周围的等效应变和应力三轴度最佳;单向压实时相对压下量为18%～20%,双向压实时相对压下量为8%～9%,都可锻合内部空洞。试验表明:物理模拟与数值模拟结果基本一致。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.

关 键 词：锻造 大锻件 中心压实法 空洞闭合 

分 类 号：TG31[金属学及工艺—金属压力加工]