共查询到20条相似文献,搜索用时 125 毫秒
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针对滚齿加工过程中的碳排放定量计算问题,提出了一种滚齿加工过程碳排放定量计算模型及其优化方法。对滚齿加工过程中的物料、能源消耗和碳排放特性进行定量分析,以零件和零件加工时间为单位对各类碳排放量进行分摊,完成批量生产中对单个齿轮碳排放的定量计算;建立以完工时间和加工质量等为约束,以滚齿加工的主轴转速和进给量为优化变量,以碳排放量和加工成本为优化目标的多目标优化模型;采用遗传算法(Genetic Algorithm,GA)进行优化求解,旨在碳排放量得到较大改善的同时可以降低加工成本,通过仿真计算验证了定量计算模型及优化方法的可行性。 相似文献
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介绍了子程序编程的特点,制定了零件工艺方案,编制了子程序加工代码,验证了加工过程的准确性。通过对生产案例加工过程反复模拟仿真,得到生产中合理的工艺方案和准确的加工程序。正确使用子程序,缩短了零件设计和加工时间,提高了生产效率。 相似文献
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薄壁弧形件装夹布局有限元优化 总被引:5,自引:0,他引:5
关于航空结构件加工变形控制的研究是高效数控加工研究的一部分。薄壁弧形零件加工中的弹性变形对加工质量影响很大,而装夹布局影响切削变形的大小和分布。以减少加工中工件最大弹性变形为目标,建立了弧形件铣削加工装夹布局的优化模型,采用商业有限元软件的设计优化模块进行计算。在对计算结果进一步分析的基础上,提出了最终的装夹布局方案,采用该方案可以得到整个加工过程中更低的变形量,变形分布更均匀,为采取相应数控补偿措施提供条件。优化方案和实际加工方案结果基本一致。所提出方法可推广至其他类型工件夹具布局优化设计。 相似文献
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基于双圆弧齿轮的齿形特点 ,结合弧齿锥齿轮的加工原理 ,进行双圆弧弧齿锥齿轮的切齿啮合分析 ,得到了切齿啮合过程中的啮合方程、产形轮齿面方程以及双圆弧弧齿锥齿轮的通用齿面方程表达式 相似文献
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齿形参数对双圆弧齿轮接触跑合性能的影响 总被引:5,自引:0,他引:5
以三维弹性接触有限元法及双圆弧齿轮跑合仿真的数学模型为基础,提出了优化的双圆弧齿轮齿形参数,对GB12759-91齿形及优化齿形的双圆弧齿轮接触、跑合性能进行对比分析,得到齿形参数对双圆弧齿轮接触、跑合性能的影响规律。 相似文献
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大型锥齿轮的加工在我国是一个没有很好解决的问题。针对这一现状,我们研究生产了一种新型锥齿轮——等基圆曲线的齿锥齿轮。该锥齿轮在任意点的法截面内当量齿轮基圆半径保持不变,则沿该齿线的半截面内渐开线齿形相同,该锥齿轮齿面便可以用指状铣刀用数控方法正确地加工出来。本文给出了这种齿轮的齿线方程,研究了齿线特性,指状铣刀的加工痕迹,建立了双自由度近似加工该齿轮的方法,毛坯-刀具位置关系式等。于1990年初,在沈阳重型机器厂减速机分厂,用TP801单板机和步进电机在改装的OKU35铣齿机上加工出一对等基圆锥齿轮(大端模数为25mm,中点螺旋角23.675°,齿数比28/16)。从对滚来看,接触区较为理想。 相似文献
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Shuangxi Xie 《The International Journal of Advanced Manufacturing Technology》2013,67(9-12):2619-2626
Accurate tooth surface and good surface quality are critical to achieve the low-noise bevel gear drives. Face milling, traditionally works as tooth roughing process, can now possibly be used for finishing process because its high speed can produce good tooth surface quality. But with the previous simplified cutter geometric model in tooth modeling, the high accurate tooth surface cannot be obtained. In this paper, a genuine face milling cutter geometric model for spiral bevel and hypoid gears is proposed. This model exactly matches with the cutter geometry in the industrial application when not considering the fabrication tolerances and tool wear . In the modeling, the blades of the genuine cutter are parameterized with blade angle, rake angles, and relief angles. The side and circular cutting edges of blades are represented on the blade rake plane, rather than the normal plane as the simplified cutter geometry. The mathematic model of the genuine tool profiles on the normal plane is derived. It can be conveniently used by the existing tooth modeling program and easily customized by specifying the geometric parameters. In comparison with the genuine tool profile with the simplified tool profile, the big geometric errors of the simplified blade profile are founded, which proves that the genuine cutter geometric model is correct and essential. 相似文献
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基于偏心误差对圆弧齿线圆柱齿轮系统啮合性能影响的研究相对较少的现状,介绍了不同加工工艺所得圆弧齿线圆柱齿轮特点,建立轴孔中心存在几何偏心的圆弧齿线圆柱齿轮三维模型,利用商业软件Adams建立考虑偏心误差的圆弧齿线圆柱齿轮动力学仿真模型,分别研究了主动轮存在偏心和从动轮存在偏心及主、从动轮同时存在偏心时圆弧齿线圆柱齿轮系统从动轮速度波动情况。研究结果表明,3种偏心工况下,圆弧齿线圆柱齿轮系统从动轮速度波动情况均呈现周期性变化,偏心量对系统从动轮速度波动情况有一定影响。研究结果为齿轮润滑、故障诊断及齿廓修形等提供了理论基础。 相似文献
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Geometry of chip formation in circular end milling 总被引:1,自引:0,他引:1
Avisekh Banerjee Hsi-Yung Feng Evgueni V. Bordatchev 《The International Journal of Advanced Manufacturing Technology》2012,59(1-4):21-35
Machining along continuous circular tool-path trajectories avoids tool stoppage and even feed rate variation. This helps particularly in high-speed milling by reducing the effect of the machine tool mechanical structure and cutting process dynamics. With the increase in popularity of this machining concept, the need for detailed study of a valid chip formation in circular end milling is becoming necessary for accurate kinematic and dynamic modeling of the cutting process. In this paper, chip formation during circular end milling is studied with a major focus on feed per tooth and undeformed chip thickness along with their analytical derivations and numerical solutions. At first, the difference in the feed per tooth formulation for end milling along linear and circular tool-path trajectories is presented. In the next step, valid formulation of the undeformed chip thickness in circular end milling is derived by considering an epitrochoidal tooth trajectory with a wide range of the tool-path radius. The complex transcendental equations encountered in the derivation are dealt with, by a case-based approach to obtain closed-form analytical solutions. The analytical solutions of undeformed chip thickness are validated with results of numerical simulations of tool and tooth trajectories for circular end milling and also compared to the linear end milling. The close resemblance between analytical and numerical calculations of the undeformed chip thickness in circular end milling suggests validity of the proposed analytical formulations. As a case study, the cutting forces in circular end milling are calculated based on the derived chip thickness formulations and an existing mechanistic model. The calculation results reiterate the need of taking into account adjusted feed per tooth and valid chip thickness formulations in circular end milling, especially for small tool-path radii, for more realistic process modeling. 相似文献
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蜗杆砂轮磨是广泛应用于中小模数齿轮的批量精加工方法,但在实际加工过程中,蜗杆砂轮磨齿易在齿向形成规则的平行齿面纹理,从而增大了齿轮的啮合噪声。分析磨削过程中蜗杆砂轮与齿轮的接触特性,建立了啮合方程和接触点方程,阐述了接触迹构成整个齿面的机理;分析蜗杆砂轮磨齿的磨削特性,建立瞬时接触点的磨削速度和形状模型,计算磨粒在齿面上的磨削路径,分析磨削特性对齿面微观几何结构的影响,得到齿面的整体纹理模型;结合齿面纹理与噪声激励的关系,分析出齿面规则纹理对齿轮噪声的影响机理,提出按照正弦函数变化的冲程变速蜗杆砂轮磨齿加工方法;进行了蜗杆砂轮磨削常规加工与变冲程速度加工的对比试验,结果表明,该方法加工的齿面接触点位置具有一定的随机性,形成不规则的齿面纹理,不同转速下齿轮啮合噪声声压级总值减小约3.5 dB,已经达到改善齿面纹理的效果。 相似文献
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主要论述了复杂零件的图样分析方法、确定复杂零件的工艺基准、加工方法和切削用量,以及编制铣削圆弧齿的宏程序。在数控加工中,由于零件复杂多样,特别是轮廓曲线的形状和位置千变万化,对具体的零件应灵活处理,制订出合理的加工方案。 相似文献