共查询到20条相似文献,搜索用时 109 毫秒
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摆线齿轮成形磨齿工艺 总被引:1,自引:1,他引:1
摆线齿轮是减速机的主要关键零件,摆线齿廓的精加工是减速机生产中难度最大、最关键的工序。磨齿是目前国内外主要的摆线齿廓精加工方法。目前国内主要采用Y7654(QC001)摆线磨齿机加工摆线齿轮。由于该机床采用双自由度点接触展成原理,加之设备动态特性较弱,生产率很低,每对齿轮平均工时她以上,表面粗糙度Ra0.8μm,常发现明显鱼鳞状或倾斜振动波纹。尤其在磨削二因差摆线齿轮时,磨一对齿轮需经一次分度两次装夹,不但效率低(4小时/对以上),而且精度不能保证,齿项修缘质量不稳定。一、磨削及辅助时间由于摆线齿轮成形磨齿法… 相似文献
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在理论计算机和磨削加工试验的基础上,,研究了用钢轮滚压修整砂轮的成形磨齿法对加工硬齿面双圆弧齿轮齿形的影响。 相似文献
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本文介绍用CBN成形磨齿法加工几种特殊结构的ZF变速箱齿轮的情况,该方法已用于生产实践中取得了显著的技术经济效果,有广泛的应用前景。 相似文献
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粉末冶金是制造金属材料和金属零件的特殊技术。本文论述了粉末冶金各分支领域的发展,及应用各类粉末冶金制品对国民经济和科学技术的贡献,粉末冶金作为新材料技术,在研制新型结构材料和功能材料中起到重要作用。并介绍了粉末冶金新技术的发展概况。 相似文献
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铜基粉末冶金多孔材料在高应变率下的力学性能及本构关系 总被引:2,自引:0,他引:2
通过实验得出铜基粉末冶金摩擦材料在高应变率下的应力应变曲线,建立该材料的本构模型。在分离式Hopkinson压杆(SHPB)上进行了该材料在10^2/s-10^3/s应变率范围内的冲击试验,弹速范围为4m/s-15m/s,在透射杆上采用半导体应变计技术;在MTS实验机上做了该材料在10^-4s/10^-3/s应变率范围内的准静态实验,分别在应变为0.005、0.01、0.02、0.035时卸载再加载,以验证该材料的粘弹塑性特征。通过分析动态和静态实验曲线,发现该材料在应变率300/s和准静态时有应变硬化效应,但在500/s以上却反映出应变软化效应,得出该材料为含损伤非线性粘弹塑性材料,故提出用适应于脆性材料的粘弹塑性模型和粘塑性项的组合本构模型来拟合该材料应变弱化段的本构方程。所得结果可推广应用于类似烧结合金的材料。 相似文献
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David Barrenetxea Jose Ignacio Marquinez Jorge Álvarez Raúl Fernández Iván Gallego Jon Madariaga 《Machining Science and Technology》2013,17(4):501-523
Recent advances in process modeling allow for more accurate prediction of complex phenomena. A combination of different modeling approaches makes it possible to develop new products to set up, control and optimize machining operations. In the near future, a continuous improvement strategy should be adopted, as improvements to advanced models open up new opportunities for industrial applications. In particular, the efforts made by different research groups on grinding have given rise to significant developments in this area, some of which have recently been made into applied software. As an example of the necessity for process modeling and the viability of industrialized tools based on it, this article presents the work carried out on the development of an assistant tool for the setting up and optimization of the centerless grinding process, focusing on avoiding the main limitations of this process and optimizing productivity. 相似文献
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Krzysztof Nadolny 《Machining Science and Technology》2013,17(1):74-92
The article depicts the kinematic parameters of micro-discontinuities and how their shaping methods impact upon the active surface of grinding wheels. It also details the construction of a special device which makes it possible to obtain micro-discontinuities with specific and defined surface configurations and shapes. Experimental research into the effects of shaping the micro-discontinuities of the grinding wheel active surface was realized in the internal deep traverse grinding process. Grinding wheels with a ceramic bond, made from micro-crystalline sintered corundum grains, were utilized in the research. The research investigated the duration of the durability period of the grinding wheels. It also looked at the grinding power, as well as the machined surface roughness, when using grinding wheel with or without micro-discontinuities shaped upon the active surface. As a result of the research undertaken, it was determined that the implementation of micro-discontinuities extends the grinding wheel durability period by at least three times its original duration, while maintaining the desired quality of the machined surface. 相似文献
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研究不同温度下高速列车用铜基粉末冶金摩擦材料磨损特征。在PlintTE77高温疲劳试验机上对该材料进行磨损性能测试 ,工况分别为室温、10 0℃、2 0 0℃、3 0 0℃、3 5 0℃、5 0 0℃ ,法向载荷为 2 0 0N、45 0N等 12种工况 ,振动频率为 4Hz ,滑动幅值为± 5mm。并对摩擦后的磨痕进行Scanelectro mirror (SEM)分析。发现①在 2 0 0N、3 0 0℃时出现碾压的多源弧形裂纹 ,这和冲击时的沿树枝晶裂纹截然不同。②在 45 0N、3 0 0℃时 ,磨痕表面出现球状的石墨颗粒层 ,这起到了极好的润滑作用 ,使得 3 0 0℃时磨损较低。③在 45 0N、3 5 0℃时 ,有沿磨痕方向的长条裂纹出现。④在不同载荷 5 0 0℃时 ,发生粘附现象 ,即摩擦材料粘附到对偶材料上。根据以上分析用最小二乘法粗略拟合了该材料的磨损规律 相似文献