薄壁六角螺母浮动冷镦工艺分析及模具结构优化
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摘要
以薄壁六角螺母为研究对象,为解决实际试模中碰到的材料折叠问题,采用DEFORM-3D软件对螺母成形过程进行模拟分析。通过模拟分析得到材料折叠原因在于模具结构的不合理,而后提出对传统浮动模具结构的改进方案。采用改进后模具重新进行模拟计算,通过对比分析其成形过程、材料流向、应变分布,材料折叠问题得到成功解决,在JNT-32B-5S多工位自动冷成形机床上进行试模,试模结果与模拟结果一致。通过有限元分析技术和试模进行对比分析,改进后模具结构能够完成带薄壁零件的成形,为带薄壁类零件的冷镦成形提供一种新的思路。
For the thin-walled hex nut,its forming process was simulated by finite element software DEFORM-3 D in order to solve the material folding during practical production. Then,the cause of material folding was improper structure of mold according to by FE analysis results,and an improved structure for traditional floating mold was proposed. Furthermore,the simulated calculation was conducted again by the improved mold,and the problem of material folding was solved successfully by comparative analysis forming process,material flow direction and strain distribution. Finally,an experiment was conducted by multi-position automatic cold forging lathe JNT-32 B-5 S,and the experimental results were consistent with the simulation results. Thus,the improved mold structure can forge the thin-walled parts by the comparative analysis of the finite element analysis technology and the trial test,which provides a new idea for the cold heading of thinwalled parts.
For the thin-walled hex nut,its forming process was simulated by finite element software DEFORM-3 D in order to solve the material folding during practical production. Then,the cause of material folding was improper structure of mold according to by FE analysis results,and an improved structure for traditional floating mold was proposed. Furthermore,the simulated calculation was conducted again by the improved mold,and the problem of material folding was solved successfully by comparative analysis forming process,material flow direction and strain distribution. Finally,an experiment was conducted by multi-position automatic cold forging lathe JNT-32 B-5 S,and the experimental results were consistent with the simulation results. Thus,the improved mold structure can forge the thin-walled parts by the comparative analysis of the finite element analysis technology and the trial test,which provides a new idea for the cold heading of thinwalled parts.
引文
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[2]张东民,刘铭心,盛育东,等.薄壁六角螺母冷镦过程中模具磨损模拟分析及参数优化[J].润滑与密封,2017,42(10):114-117.Zhang D M,Liu M X,Sheng Y D,et al.Process analysis and parameter optimization on die wear in cold heading for thin-walled hex nut[J].Lubrication Engineering,2017,42(10):114-117.
[3]Cenk Kl9aslan,Umut I·nce.Failure analysis of cold forged 37Cr4alloy M10×28 bolts[J].Engineering Failure Analysis,2016,70:177-187.
[4]Liu G,Zhang L B,Hu X L,et al.Applications of numerical simulation to the analysis of bulk-forming processes case studies[J].Journal of Materials Processing Technology,2004,150(1-2):56-61.
[5]Deng X,Hua L,Han X,et al.Numerical and experimental investigation of cold rotary forging of a 20Cr Mn Ti alloy spur bevel gear[J].Materials&Design,2011,32(3):1376-1389.
[6]Song M C,Lee U L,Vantyne C J,et al.Symmetric bending technology using a floating die to forge crank throws for marine engines[J].Journal of Materials Processing Technology,2016,237:197-207.
[7]薛克敏,李晓冬,李萍,等.圆柱斜齿轮浮动凹模冷挤压成形仿真与实验研究[J].中国机械工程,2012,23(4):464-468.Xue K M,Li X D,Li P,et al.Simulation and experimental research on floating die cold forming of helical gears[J].China Mechanical Engineering,2012,23(4):464-468.
[8]Roulund A,Mutlu Sumer B,Fredse J,et al.Numerical and experimental investigation of flow and scour around a circular pile[J].Journal of Fluid Mechanics,2005,534:351-401.
[9]Selvamani S T,Palanikumar K.Optimizing the friction welding parameters to attain maximum tensile strength in AISI 1035 grade carbon steel rods[J].Measurement,2014,53(5):10-21.