冲压剪切中相对间隙及关联尺寸与拉应力的关系  

Relation of relative clearance and associated size with tensile stress in stamping shear

作　　者：陈敦佳 关意鹏[2] 杜雪磊 Chen Dunjia;Guan Yipeng;Du Xuelei(Liuzhou Quality Inspection Detection Research Center,Liuzhou 545006,China;Mechanical and Electronic Engineering Department,Liuzhou Vocational&Techinical College,Liuzhou 545006,China;Library,Liuzhou Vocational and Technical College,Liuzhou 545006,China)

机构地区：[1]柳州市质量检验检测研究中心,广西柳州545006 [2]柳州职业技术学院机电工程学院,广西柳州545006 [3]柳州职业技术学院图书馆,广西柳州545006

出　　处：《锻压技术》2024年第2期86-90,共5页Forging & Stamping Technology

基　　金：2021年第一批推荐性国家标准计划及相关标准外文版计划(20210759-T-605);广西高校中青年教师基础能力提升项目(2021KY1041)。

摘　　要：针对冲压生产过程中由于磨损导致间隙变大而产生的试样变形和毛刺变大等问题,通过受力分析探究了冲压剪切过程中拉应力的产生原因和关联因素等,并进行了理论推导和试验验证。结果显示:试样轴向平均拉应力P与试样宽度W、中心层内移系数χ、材质属性关联系数K_(1)以及剪切试验的相对间隙与最大剪应力状态下的相对间隙之差(R-R_(2))成正比,与凹模刃口尺寸D_(d)成反比。当剪切力处于非最大剪应力状态时,剪切过程中试样会产生弯矩,弯矩导致试样中心层内移,而中心层内部材料承受的压应力与中心层外部材料承受的拉应力并不对称,且材料承受的拉应力大于压应力,使试样整体呈拉应力状态。For the problems of sample deformation and burr enlargement due to large gap caused by wear in the stamping production process,the causes and related factors of tensile stress in the stamping shear process were explored through force analysis,and the theoret-ical derivation and experimental verification were carried out.The result shows that the average axial tensile stress P of specimen is pro-portional to sample width W,central layer inward movement coefficient X,material property correlation coefficient K_(1),and difference be-tween the relative clearances in shear test and maximum shear stress state(R-R_(2)),and it is inversely proportional to the die edge size D_(d).When the shear force is in a non-maximum shear stress state,the specimen generates a bending moment during the shear process,which causes the central layer of specimen to move inward.However,the compressive stress endured by the material inside the central layer is not symmetrical to the tensile stress endured by the material outside the central layer,and the tensile stress of material is greater than the compressive stress,making the entire sample in a tensile stress state.

关 键 词：弯矩 相对间隙 拉应力 凹模刃口尺寸 冲压剪切 

分 类 号：TG389[金属学及工艺—金属压力加工]