圆筒件极限拉深系数mk研究

考虑材料加工硬化的影响,本文通过对圆筒件及带凸缘的圆筒件首次拉深过程中变形区材料的应力和应变的理论分析 ,推导出圆筒件及带凸缘圆筒件首次拉深时极限拉深系数的近似计算公式.由推导公式计算的结果与实验值相比误差较小.在实际拉深此类零件时,可由推导的公式直接计算出圆筒件及带凸缘圆筒件首次拉深时极限拉深系数.     

圆筒件极限拉深系数mk研究

考虑材料加工硬化的影响,本文通过对圆筒件及带凸缘的圆筒件首次拉深过程中变形区材料的应力和应变的理论分析 ,推导出圆筒件及带凸缘圆筒件首次拉深时极限拉深系数的近似计算公式.由推导公式计算的结果与实验值相比误差较小.在实际拉深此类零件时,可由推导的公式直接计算出圆筒件及带凸缘圆筒件首次拉深时极限拉深系数.     

圆形笔筒注射模设计

分析了圆形笔筒塑件结构及成型工艺,介绍了分型面的选择及浇注系统设计,重点阐述了圆形笔筒注射模结构设计。模具采用1模2腔结构、点浇口进料以及斜导柱侧向抽芯机构,成型出的塑件满足质量要求。     

金刚石微粉烧结棒和D、GC杯型砂轮修整碟型金刚石砂轮对比研究

通过对D，GC杯型砂轮和金刚石微粉烧结棒修整大直径树脂结合剂碟型金刚石砂轮的对比实验，以反映砂轮平面度的周向跳动变化率和径向跳动变化率作为修整效率的评价依据，以被修砂轮加工出硬质合金插齿刀的齿形误差作为修整质量的评价依据，从修整原理及修整模型上分析了影响修整效率和修整质量的主要因素，分析结果表明：被修砂轮金刚石颗粒微切削频率以及修整力方向对修整效率有很大的影响；修整质量与作用在被修砂轮上的修整运动有关，磨削，单用GC杯型砂轮法修整后的碟形金刚石砂轮适合于粗磨和半精磨；D，GC杯型砂轮组合修整法既具有高的修整效率也具有高的修整质量，是一种可广泛应用的修整方法。     

杯形件温引伸数值模拟

用MARC/AutoForge软件对杯形件温引伸工艺进行了数值模拟 ,分析了凹模锥角及凸、凹模与工件之间摩擦系数对引伸工艺的影响 ,为杯形件温引伸工艺的制定提供了依据。     

沙滩玩具杯主体件注射模设计

介绍了沙滩玩具杯主体件注射模设计与工作过程。模具采用热流道浇注系统,推板顶件出模方式,侧边滑块采用滑块套滑块结构,冷却系统采用隔板式冷却水路。生产实践证明,模具结构合理,脱模顺利,塑件质量满足设计要求。     

Numerical simulation of cup hydrodynamic deep drawing

1　ＩＮＴＲＯＤＵＣＴＩＯＮＡｃｔｕａｌｌｙ ,ｔｈｅｈｙｄｒｏｄｙｎａｍｉｃｄｅｅｐｄｒａｗｉｎｇｐｒｏ ｃｅｓｓ (ＨＤＤ)ｂｅｌｏｎｇｓｔｏｔｒａｄｉｔｉｏｎａｌｄｅｅｐｄｒａｗｉｎｇｐｒｏ ｃｅｓｓ.Ｂｅｆｏｒｅｄｒａｗｉｎｇ ,ｔｈｅｄｉｅｃａｖｉｔｙｉｓｆｉｌｌｅｄｆｕｌｌｙｗｉｔｈｌｉｑｕｉｄｓｕｃｈａｓｏｉｌ,ｗａｔｅｒｏｒｏｉｌｗａｔｅｒｅｍｕｌｓｉｏｎ .Ｗｈｅｎｔｈｅｐｕｎｃｈｐｒｅｓｓｅｓｔｈｅｂｌａｎｋａｎｄｇｏｅｓｄｏｗｎｉｎｔｏｔｈｅｄｉｅ,ｔｈｅｌｉｑｕｉｄｉｓｃｏｍｐｒｅｓｓ…     

筒形件拉深模CAD系统的开发

模具CAD系统使模具设计的高质量、低成本、短周期的实现成为可能.本文利用ActiveX Automation技术,以VB6.0为开发工具对AutoCAD进行二次开发,研究出筒形件冲压模具CAD系统,系统采用模块化结构,主要阐述了工艺分析计算模块、模具设计模块、自动绘图模块等主要模块功能及其实现方法,该系统能够对不同规格筒形件的冲压模具进行计算机辅助设计,完全实现人机交互功能,提高了设计效率和质量.     

保温杯杯盖注射模设计

针对杯盖在不同方向上有侧向圆孔和局部侧向凸起、内壁有梯形内螺纹的特点,设计了侧向抽芯、自动脱螺纹及模温控制系统,设计的模具结构紧凑、运转平稳,解决了手动脱螺纹成本高、效率低、易损伤模具的问题,生产的塑件达到了技术要求。     

车轴盖复合模设计

分析了1副复合模实现落料、拉深、冲孔、翻边4道工序一次冲压成形的工艺性,解决了车轴盖冲压成形一般需要4副模具完成的问题。同时还介绍了复合模结构设计思路及装配工艺方法,突破了复合模只能完成3道工序的方法,在模具结构设计上有所创新,并给出此类模具设计中结构参数的计算方法,生产的零件符合要求。     

NiTi形状记忆合金杯形件反挤压工艺研究

本文对NiTi形状记忆合金杯形件反挤压工艺进行了研究,给出NiTi形状记忆合金不同条件下的成形情况,成形过程的载荷大小.采用数值模拟的方法研究了挤压过程中的应力、应变和温度的分布情况,模拟结果和实验结果相吻合.确定了可行的NiTi形状记忆合金杯形件的反挤压工艺,为采用塑性成形的方法进行NiTi合金的批量生产工艺研究奠定基础.     

Deformation analysis and blank design in square cup drawing

A finite-element procedure is developed for modeling of the square cup drawing process based on finite strain formulation and membrane theory. The sheet material was assumed to obey Hill's anisotropic yield criterion and its associated flow rule. The workhardening characteristics of the material and Coulomb friction between the sheet metal and forming tools were incorporated into the simulations. Computed results with a square blank for the strain distributions were found to be consistent experimental data. Solutions were also obtained for various blank shapes with identical surface areas. Good correlations were found between the finite-element predictions and experiments for load-displacement curves and deformed-flange configurations.Based on the finite-element results of net material flow during the deformaion, an optimum blank shape was determined. Using this optimum blank shape, both the finite-element simulation and cup drawing experiment were performed and it was shown that a cup with the flange of uniform size around its periphery was obtained at a predetermined cup height.     

轴盖成形工艺与模具设计

分析了轴盖的冲压工艺性,对传统工艺进行了改进,介绍了其复合模和修边模结构及设计要点。实际生产证明,模具结构合理,生产效率高,对同类零件的模具设计具有借鉴作用。     

"杯盖"三板式注塑模具设计与制造

从"杯盖"三板式注塑模的结构设计、制造工艺着手,对三板式注塑模的典型结构进行了剖析,对模具制造的结构工艺性(制造的可行性、经济性)进行了分析.着重介绍了三板式注塑模的结构特点和设计要点,同时,从模具制造的结构工艺方面,介绍了凸、凹模的定位加工、定模底板和剥料板的合件加工、凸模部位顶出杆孔的制造加工,以及其他的一些部位制造加工等制造要点.     

Blank design in rectangular cup drawing by an approximate method

An approximate geometrical method is developed to determine an optimum blank profile in rectangular cup drawing which gives a drawn cup with the residual flange of uniform size around its periphery or with the levelled height. By assuming a velocity field in a curvilinear, orthogonal coordinate system, flow lines of material points in the blank are formulated and the contours of the flange for given blank shapes were determined at several punch steps for the rectangular and square cup-drawing.The two parameters involved in describing the velocity field were determined by comparing the results of calculation with those of experiment. Then, optimum blank profiles were designed for the required drawn cup configurations. Validation of the design by experiment was performed and the results show that the method is a good approximation, although some improvement of the method is possible.     

Key technologies of numerical simulation of cup hydrodynamic deep drawing

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｆｏｒｍｉｎｇｔｈｅｏｒｙｏｆｈｙｄｒｏｄｙｎａｍｉｃｄｅｅｐｄｒａｗ ｉｎｇ (ＨＤＤ) ｐｒｏｃｅｓｓｉｓｓｈｏｗｎｉｎＦｉｇ .1[1] .Ｉｔｈａｓｂｅｅｎｐａｉｄｍｕｃｈａｔｔｅｎｔｉｏｎｉｎｔｈｅｗｏｒｌｄｂｅｃａｕｓｅｉｔｈａｓｍａｎｙａｄｖａｎｔａｇｅｓ[2～ 4 ] .Ｈｏｗｅｖｅｒ ,ｍａｎｙｉｎｆｌｕｅｎｃｉｎｇｆａｃｔｏｒｓｅｘｉｓｔｉｎｔｈｅｐｒｏｃｅｓｓｏｆＨＤＤ ,ａｎｄｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｉｎｆｌｕｅｎｃｉｎｇｆａｃｔｏｒｉｓｔｈｅｅｆｆｅｃｔ…     

Analysis of wear in deep-drawing process of a cylindrical cup

In the present investigation, a deep-drawing process forming a cylindrical cup is simulated using the finite element method to study the wear depth on the draw die arc segment. Both the Blank and the die are assumed to be deformable. For the blank, both the elasto-plastic and elasto-viscoplastic material behaviors are considered, while the die material is assumed to be elastic. The materials are isotropic and Von-Mises yield criterion is employed. Considering the elasto-viscoplastic behavior for the blank, the effect of punch speed on the wear depth of the die shoulder is investigated. Meanwhile, the effects of different process parameters such as the blank holder force, the die radius as well as the clearance between the punch and the die on the wear depth profile of the arc segment of the die are investigated and several conclusive results are presented. The results show to be in good agreement with those cited in literature.     

铝合金筒形件的电磁脉冲辅助渐进拉深成形

铝合金的室温成形性较差,用传统压力机拉深成形时,在凹模内径不变一道次拉深的条件下,极限拉深高度较低。采用电磁辅助拉深成形方法,可以将工件的拉深高度提高到传统方法的1.44倍。文章设计了一种具有法兰助推拉深能力的环形线圈结构,形成了拉深与助推联合作用的电磁脉冲辅助渐进拉深成形工艺。试验结果表明,采用这种新工艺可以使铝合金板料的拉深成形高度提高到传统方法的2.16倍。     

Finite element analysis of sheet Hydromechanical forming of circular cup

Sheet hydroforming is a process of converting flat sheet into desired component geometry by using water pressure in a controlled manner. This paper dealt with sheet Hydromechanical forming (SHMF) of circular cup. In this process, blank is first placed on the lower die (a fluid chamber combined with draw ring) and then after sealing the blank between blank holder and draw ring, punch progresses to deform the blank. Pressure of the fluid chamber is also increased simultaneously with the punch progression. The present work endeavours to understand the effect of strain hardening exponent, anisotropy ratio and interfacial friction between blank and tools surfaces for different modes of deformation––stretching to drawing mode on sheet Hydromechanical forming of circular cups.A finite element (FE) model was developed for simulating the SHMF process using dynamic explicit, commercial code, LsDyna. The model after experimental validation used for studying the effect of above parameters on the process. The analysis reveals that higher cup depth with minimum thinning for forming dominated by stretching mode can be achieved with material of higher anisotropy ratio, strain hardening exponent by using a rough punch and effective lubrication at blank-die–blank holder interfaces. On the other hand in case of drawing as mode of deformation, thinning is influenced mainly by interfacial friction condition between blank and tool surfaces as compared to material properties.