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《制造技术与机床》2019,(8)
弧齿锥齿轮小轮铣削通常在专用机床上采用铣刀盘实现,从而导致制造成本较高。为了降低弧齿锥齿轮小轮的制造成本,提出一种在通用四轴数控铣床上采用球头铣刀进行铣削加工的方法。根据齿面数学模型计算齿面离散点坐标,进而创建齿轮实体模型。分析齿根铣削时球头铣刀与齿轮的空间位置关系,以铣削一侧共轭齿面时不刮伤对侧共轭齿面为原则确定球头铣刀直径。以刀杆与齿面不发生干涉为前提,确定处于各个加工位置时的刀轴方向。以沿齿高和齿长方向均匀分布的齿面离散点为基础,创建沿齿高方向分层的粗铣刀路和沿齿长方向分层精铣刀路。创建包含机床、刀具和轮坯的仿真加工环境,完成齿轮铣削仿真。结果表明:相比于铣刀盘,球头铣刀加工得到的过渡曲面曲率半径更大,可降低齿根处的应力集中程度。将刀路导入数控加工系统,在四轴数控铣床上完成齿轮的粗铣和精铣,获得的齿面具有较好的光洁度,从而验证了本方法的可行性。 相似文献
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为了实现使用盘形铣刀数控加工等基圆曲线齿锥齿轮,基于等基圆曲线齿锥齿轮理论,通过建立盘形铣刀加工数学模型,求解了决定刀具空间姿态的主要参数。通过盘形铣刀刀轴矢量、刀心坐标的求解,得到了轮坯坐标系下的刀位。结合通用五坐标数控机床,求得了五坐标数控加工等基圆锥齿轮运动轨迹的表达式。通过三维造型,对刀位求解进行了分析验证;通过仿真切削加工,验证了运动轨迹的正确性。结果表明,利用盘形铣刀数控加工等基圆锥齿轮的刀具位姿、运动轨迹的求解正确,在通用数控机床上利用盘形铣刀能够加工等基圆曲线齿锥齿轮。 相似文献
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当加工精度要求不高的直齿锥齿轮时,其盘铣刀的齿形可用如下的作图法求得。此法作图简单,而且铣刀齿形样板的制造也较方便,尤其对缺乏曲线磨床的中、小型工厂更为适用。一、作图法的依据盘铣刀的齿形是锥齿轮大端当量齿轮的齿形,宽窄是按小端当量齿轮齿间的宽窄来制造的。如图1所示,用盘铣刀加工齿轮毛坯时,铣刀只能铣出齿坯上 相似文献
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通过在VB中调用SolidWorks API的属性和方法,建立了齿轮毛坯和盘铣刀的三维参数化模型.控制刀具实体和毛坯实体的相对位置和相对运动关系,进行实体间的布尔运算,模拟真实齿轮的加工过程,得到螺旋锥齿轮的三维仿真加工几何模型;获取螺旋锥齿轮的齿面离散点,在此基础上实现了螺旋锥齿轮齿面的NURBS表示,并通过了实例验证. 相似文献
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分析了螺旋锥齿轮磨齿加工的基本原理,以AutoCAD为开发平台,利用AutoCAD内嵌的VBA编程语言,建立了基于尺寸驱动的齿坯和砂轮的实体模型,将数控螺旋锥齿轮磨齿机的各轴运动转化为砂轮和齿坯的相对位置调整,通过砂轮与齿坯之间的相减布尔运算模拟磨齿加工过程,通过仿真实例验证了仿真算法的正确性。数控螺旋锥齿轮磨齿加工仿真系统为精确生成齿轮的三维实体模型以及验证机床调整参数提供了解决方法。 相似文献
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为快速获取蜗杆面齿轮的精确齿面,提出了一种加工面齿轮的新方法——飞刀加工法。建立了蜗杆面齿轮的理论模型,基于四轴数控镗床建立加工坐标系,分析了所提方法的加工机理,并将其分为两个阶段:仿形阶段和分度加工阶段;采用飞刀加工法进行刀具轨迹的求解,得到了该轨迹在面齿轮齿坯上的切触迹线,验证了所提方法的正确性;求解了上述两个阶段中刀具主轴转速、工件轴转速及刀具进给速度之间的关系,编制了加工程序,并在VERICUT中对蜗杆面齿轮进行了仿真加工,验证了所提方法的可行性;最后进行了加工实验验证。 相似文献
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Octree-based NC simulation system for optimization of feed rate in milling using instantaneous force model 总被引:1,自引:1,他引:0
K. P. Karunakaran Rohitashwa Shringi Deepak Ramamurthi C. Hariharan 《The International Journal of Advanced Manufacturing Technology》2010,46(5-8):465-490
An octree-based (numerical control) NC simulation (Oct-OAC) system developed for end milling has two major applications: (1) NC verification and (2) optimization of the cutting parameters, viz., spindle speed, N (s?1), and feed rate, f (ms?1). Oct-OAC has a geometric modeling module to simulate the geometry of material removal process. Every object in the machining environment such as cutter, instantaneous workpiece, swept volume, etc. is stored as octree, an inexact representation of solid. Using this module, one can predict the geometry of the material removed at any instant of time and update the geometry of the blank subsequently. Optimization of cutting parameters using Oct-OAC is achieved through optimization module using a mechanistic model for computation and prediction of the cutting forces at any instant. The basic input for this module is the geometry of the contact surface between the cutter and workpiece which comes from the geometric modeling module using an octree-based solid modeler. It is through this contact surface that the cutting forces are passed from the workpiece onto the cutter and vice versa. The mechanistic modeling module can predict the instantaneous cutting forces from the instantaneous contact geometry and other process parameters like material combination of cutter–workpiece, parameters defining cutter geometry, and current cutting parameters such as N and f. Using this prediction, it will modify the cutting parameters for maximizing the material removal rate. This way, the mechanistic modeling module does what an adaptive controller will do with the help of force sensing. Therefore, the NC program optimization done using the Oct-OAC system is actually off-line adaptive control. 相似文献
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瞬时刚性切削力的建模是铣削加工物理仿真的基础,然而,球头铣刀的刀齿形状复杂,加工过程中姿态多变,瞬时刚性铣削力的建模难度较大。在考虑刀具姿态调整的情况下,通过齐次坐标变换建立了刀齿的运动轨迹,提出了一种识别刀具和工件瞬时接触区的改进Z-MAP算法,通过计算当前刀齿的参考线与工件的边界面或刀齿扫掠面的交点求出瞬时未变形切屑厚度,并采用非线性回归的方法辨识了切削力系数,在此基础上使用微元积分法建立了瞬时切削力的计算模型。为了验证仿真模型的可靠性,分别进行了垂直加工和倾斜加工试验,试验和仿真结果具有较高的一致性,表明该建模仿真方法是有效的,可以为实际加工中参数的选择和优化提供理论依据。 相似文献
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Process modeling and toolpath optimization for five-axis ball-end milling based on tool motion analysis 总被引:2,自引:2,他引:0
Liqiang Zhang 《The International Journal of Advanced Manufacturing Technology》2011,57(9-12):905-916
In free-form surface machining, the prediction of five-axis ball-end milling forces is quite a challenge due to difficulties of determining the underformed chip thickness and engaged cutting edge. Part and tool deflections under high cutting forces may result in poor part quality. To solve these concerns, this paper presents process modeling and optimization method for five-axis milling based on tool motion analysis. The method selected for geometric stock modeling is the dexel approach, and the extracted cutter workpiece engagements are used as input to a force prediction. The cutter entry?Cexit angles and depth of cuts are found and used to calculate the instantaneous cutting forces. The process is optimized by varying the feed as the tool?Cworkpiece engagements vary along the toolpath, and the unified model provides a powerful tool for analyzing five-axis milling. The new feedrate profiles are shown to considerably reduce the machining time while avoiding process faults. 相似文献
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数控加工碰撞干涉检验的新方法 总被引:4,自引:1,他引:3
刀具与工作台、夹具的碰撞,刀具过切及碰伤工件成型表面是数控加工中较难解决的三个关键问题。本文提出了一种基于B-rep表示的碰撞干涉检验算法,用于数控加工过程仿真,能较好地解决上述问题及刀具的少切问题。 相似文献