【摘要】：傳統(tǒng)對汽車半軸螺母的加工采用的是熱鐓、切削加工的方式,生產環(huán)境惡劣,低效耗材,成型產品質量較差,.基于此,提出了汽車半軸螺母精鍛成型工藝的研究,并針對兩種典型的螺母進行了相關技術的探究。簡單闡明了金屬體積成型的特點、變形方式及有限元理論等,列舉了六角開槽螺母的典型生產工藝,以此為基礎,設計了六角開槽螺母的兩套六工位冷鍛成型工藝方案,分析了螺母的成型難度以及影響成型的若干因素,合理分配了各道工序間材料的變形量,并從理論角度說明了兩工藝方案實施的可行性。研究了 SCM435合金鋼材料的力學行為,并建立了不同溫度及應變率條件下的J-C本構模型,完成了兩套成型工藝系統(tǒng)的有限元建模、材料斷裂準則相關關鍵參數(shù)的選擇與設置及數(shù)值計算,基于仿真結果分析確定成型工藝路線。簡述了浮動反擠壓成成型的特點,以承受高負載的反擠壓下沖頭的磨損量為優(yōu)化目標,上沖頭沖壓速度、接觸面間的摩擦系數(shù)等為因素水平,結合多因素多水平正交試驗,獲取最佳組合,并根據(jù)結果指導完成模具的設計工作。最后,立足企業(yè),將偏心螺母作為典型汽車半軸螺母來驗證有限元模擬分析應用于汽車半軸螺母冷鍛成型工藝的可行性�；谟邢拊夹g,建立了成型工藝優(yōu)化數(shù)學模型,并選定了主要的目標函數(shù)來優(yōu)化工藝,確定最終成型工藝,完成偏心螺母多工位模具的設計。最后,結合企業(yè)現(xiàn)場試驗,采用多工位自動冷鐓機,進行偏心螺母的試制,與仿真試驗比較,以判斷有限元模擬試驗的可靠性。
[Abstract]:The traditional way of machining automobile semi-axle nut is hot upsetting and cutting, the production environment is bad, low efficiency consumables, the quality of molding products is poor. Based on this, the research on precision forging process of automobile semi-axle nut is put forward, and two typical nuts are discussed in this paper. The characteristics, deformation mode and finite element theory of metal volume forming are simply expounded. The typical production technology of hexagonal slotted nut is enumerated. On the basis of this, two sets of six-station cold forging process scheme for hexagonal slotted nut are designed. The difficulty of nut forming and some factors affecting forming are analyzed, and the deformation of materials in each process is reasonably allocated. The feasibility of the implementation of the two technological schemes is explained from the point of view of theory. The mechanical behavior of SCM435 alloy steel was studied, and the J-C constitutive model under different temperature and strain rate was established, and the finite element modeling of two sets of forming process system was completed. The selection and setting of key parameters of material fracture criteria and numerical calculation are used to determine the forming process route based on the analysis of simulation results. This paper briefly describes the characteristics of floating backward extrusion forming, taking the wear amount of the lower punch under high load as the optimization objective, the stamping speed of the upper punch and the friction coefficient between the contact surfaces as the factor level, and combining with the multi-factor and multi-level orthogonal test. Get the best combination, and guide the mold design work according to the results. Finally, based on the enterprise, the eccentric nut is taken as a typical automobile semi-shaft nut to verify the feasibility of the finite element simulation analysis applied to the cold forging process of automobile semi-shaft nut. Based on the finite element technique, the mathematical model of forming process optimization is established, and the main objective function is selected to optimize the process, the final forming process is determined, and the design of multi-station die for eccentric nut is completed. Finally, a multi-station automatic cold heading machine is used to test the eccentric nut and compare it with the simulation test in order to judge the reliability of the finite element simulation test.
【學位授予單位】：上海應用技術大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG62;TG316

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