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试验研究半固态AZ61合金的本构关系 总被引:5,自引:0,他引:5
采用Gleeble1500热模拟试验机,对用应变诱发熔体激活法(SIMA)制备的AZ61半固态镁合金坯料进行了半固态单向压缩试验,分析它们的应力-应变关系,研究了主要热力参数(应变速率εz、应变εz、变形温度θ、液相率fL)与AZ61半固态镁合金应力之间数值关系,应用多元非线性回归方法建立半固态AZ61合金的本构关系,为AZ61半固态镁合金加工过程的数值模拟和热力参数的合理制订与控制提供了基础。 相似文献
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半固态A356铝合金坯料新制备工艺 总被引:1,自引:0,他引:1
姜华海 《机械工人(热加工)》2011,(3):72-74
采用近液相线法结合新SIMA法复合工艺制备半固态A356铝合金坯料,研究了浇注温度、等径角挤压(ECAP)和半固态处理温度、时间对坯料组织的影响。结果表明,适当的工艺参数可以制备出球状初生α-Al相晶粒的半固态A356铝合金坯料,其中较合理的工艺参数为:近液相线浇注温度为610℃,半固态保温温度为580℃,半固态保温时间为20min。 相似文献
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系统地研究了半固态高压压铸AZ91D镁合金铸件的时效行为.研究结果表明:无论是铸态组织还是固溶态组织、半固态高压压铸都可以有效缩短AZ91D铸件的时效时间. 相似文献
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半固态高压铸造AZ91D镁合金的显微组织与力学性能 总被引:2,自引:0,他引:2
通过降低浇注温度来制备半固态料坯,再将料坯重熔至半固态,最后运用高压铸造技术成型摩托车用AZ91D镁合金零件;用光学显微镜、拉伸试验机和硬度仪等研究了成型零件的显微组织和力学性能。结果表明:半固态料坯的组织由初生α-Mg相、次生α相和γ-Mg17Al12相共晶组织构成,降低浇注温度可使组织细化;重熔后组织由未熔的α-Mg固熔体和部分液相转变相组成;经过半固态高压铸造成型后,零件显微组织由未熔的α-Mg相与网状分布的共晶相组成;用该工艺制备零件的力学性能受到组织缺陷和铸件内部缺陷的影响较大,需要进一步优化半固态成型工艺。 相似文献
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综述了国内外关于数值模拟技术在半固态流变铸造过程、触变铸造过程及二次加热等方面的研究进展,并展望了半固态成型数值模拟的应用前景及意义。同时,采用商业有限元软件DEFORM3DTM成功地模拟了半固态镁合金AZ91D的成型过程,并利用自制的模具,对AZ91D镁合金570℃时的触变成型作了试验验证。通过对比得出模拟结果与试验结果基本吻合。 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献
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Polyvinyl pyrrolidone-Iodine complex (PVP-I) molecules were impregnated into the anodic oxide of an aluminum disk specimen. It was rubbed against a silicon nitride ball specimen using a ball-on-disk type friction test rig. Over the limited range of parameters studied (load: 0.2-1.0 N, sliding velocity: 0.6 mm/s, and sliding distance: 1-7 m), the coefficient of friction decreased to a value as low as 0.01 from values of 0.3 to 0.7 for the anodic oxide surface. Single-crystal iodine rubbed against silicon nitride showed a coefficient of friction of 0.1. The low coefficient of friction is attributed to the thin PVP-I film on the relatively hard anodic oxide. The mechanism of coefficient of friction reduction is the same as that of a thin soft film on a hard substrate. 相似文献