滑动叉模锻成形技术  

Die forging technology for sliding fork

作　　者：程俊伟[1,2] 常世超 刘其勇 陈喜乐 郭艳珺 Cheng Junwei;Chang Shichao;Liu Qiyong;Chen Xile;Guo Yanjun(School of Materials,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Xuchang Zhongxing Forging Co.,Ltd.,Xuchang 461111,China)

机构地区：[1]郑州航空工业管理学院材料学院,河南郑州450046 [2]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074 [3]许昌中兴锻造有限公司,河南许昌461111

出　　处：《锻压技术》2022年第11期22-27,共6页Forging & Stamping Technology

基　　金：材料成形与模具技术国家重点实验室开放课题研究基金(P2019-016);河南省高等学校重点科研项目计划(17A460027);许昌市转型升级创新专项(20200111022)。

摘　　要：叉类锻件的工艺难点是劈叉,其材料利用率一般较低。通过分析某一型号短空心轴滑动叉的外形和金属分布规律,提出了弯曲成形U形叉、挤压成形空心杆的模锻思路,制定了5步模锻工艺方案。预锻成形时进行弯曲和挤压复合变形,毛坯在凸模作用下弯曲为U形,并挤压成形部分杆部;终锻成形时,利用预锻件的外形定位,挤压成形空心杆部,并对U形叉进行整形。模拟了预锻和终锻成形过程,验证了理论分析的正确性。根据制定的成形方案,设计制造了锻模,并模锻成形出合格的锻件。该方案避免了开式挤压劈叉工艺造成的材料流动不均匀的问题,同时成形了空心杆部、降低了金属消耗和机械加工量,而模锻成形产生的飞边和冲孔连皮可利用模具切除。相对于坯料水平分模开式模锻,该方案材料利用率提高约15%,对生产具有一定的指导意义。The main process difficulties for fork forgings are to split fork which has lower material utilization. Therefore, through the analysis on the shape and metal distribution law of a certain type of short hollow shaft sliding fork, the die forging idea of bending U-shaped fork and extruding hollow rod was proposed, and a five-step die forging process scheme was proposed. A compound deformation of bending and extrusion was conducted in the pre-forging. The blank was bent into U-shape under the action of punch, and the part of rod was extruded. In the final forging, the shape of pre-forgings was used for positioning, the hollow rod was extruded, and the U-shaped fork was shaped. Then, the deformation processes of pre-forging and final forging were simulated to verify the correctness of theoretical analysis. Furthermore, based on the forming scheme, the forging mold was designed and manufactured, and the qualified forgings were gotten. Using the designed process, the problem of uneven material flow was avoided caused by the open extrusion split process, and the hollow rod was extruded at same time, which reduced the material consumption and the subsequent machining quantity. In addition, the flash and punched skins produced by die forging could be removed by the mold. Relative to the conventional horizontal placing open die-forging process, the material utilization rate is improved by about 15%. Thus, the scheme has certain guiding significance for production.

关 键 词：滑动叉 模缎 劈叉 预锻 终锻 

分 类 号：TG316[金属学及工艺—金属压力加工]