共查询到19条相似文献,搜索用时 203 毫秒
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整体叶盘的加工余量主要是在其通道开槽粗加工阶段去除的,合理选取整体叶盘粗加工通道余量去除方法是降低通道加工费用、实现整体叶盘加工经济性的关键。由于线切割机床加工单位成本低的原因,采用线切割加工方法对整体叶盘通道进行去余量加工。提出利用叶型与轮毂偏置面确定通道加工边界;通过比较通道边界投影后的投影面积大小确定最优矢量;然后根据最优矢量确定线切割丝与叶盘端面之间的夹角以及切割区域,实现整体叶盘粗加工阶段去除余量最大化。该方法可以有效地解决整体叶盘粗加工阶段经济性问题。试验表明,线切割加工可以应用在整体叶盘通道去余量加工中,并且与传统数控铣削相比,单个通道的加工费用仅为数控铣削加工费用的1/20。 相似文献
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《计算机集成制造系统》2014,(2)
为了实现整体叶盘叶片型面数控抛光,针对五坐标数控抛光机,研究开式整体叶盘叶片型面数控抛光轨迹规划与编程技术。通过分析多坐标数控抛光系统结构及开式整体叶盘抛光工艺方法,提出面向抛光加工的路径规划方法,选择分段直纹面拟合逼近叶片型面,利用分段直纹面的直母线直接生成刀位轨迹。最后进行了数控抛光实验验证,实现了整体叶盘叶片型面抛光的机械化和自动化,极大地提高了整体叶盘的抛光效率,为航空发动机整体叶盘的使用性能和安全可靠性提供了保障。 相似文献
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通过盘铣、插铣实验,验证了盘铣应用于整体叶盘加工的可行性,在此基础上提出整体叶盘复合铣加工工艺,将盘铣、插铣、侧铣集成于一台机床上,盘铣用于开槽粗加工、插铣用于曲面成形、侧铣用于除棱清根,实现一次装夹完成整体叶盘的粗加工、半精加工、精加工。以某发动机一级风扇盘开槽粗加工为例,通过UG仿真复合铣、插铣+侧铣、侧铣三种工艺过程,计算出三种工艺的加工时间,计算结果表明复合铣工艺的加工效率是插铣+侧铣的2倍,是侧铣工艺的10倍左右,验证了复合铣工艺的高效性。基于复合铣工艺思想,设计了复合铣机床的整体结构,由高刚性、大扭矩的盘铣、插铣主轴系统实现整体叶盘的复合铣加工,以满足加工的要求。 相似文献
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介绍了直纹面叶轮逆向建模流程,以及叶轮叶片曲面参数对编程与加工的影响。通过对叶轮叶片曲面参数进行研究,提出自由曲面拟合为直纹面的一种近似算法。对这一算法的原理进行了分析,并开发了算法自动处理程序,解决了直纹面叶轮逆向造型问题。这一算法可以提高直纹面叶轮建模质量,进而提高叶轮的加工精度。 相似文献
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直纹面叶轮插铣加工关键技术 总被引:1,自引:0,他引:1
为提高整体叶轮的粗加工效率,弥补目前商用计算机辅助制造软件在五坐标插铣加工能力方面的不足,研究了直纹面叶轮五坐标插铣加工的关键技术。根据直纹面叶片的偏移边界矢量,利用四元数插值方法计算插铣加工的刀轴矢量,提出并推导了五坐标插铣加工的行距和步距计算公式,保证了插铣加工的材料去除率和加工效率。依据上述算法自主开发了整体叶轮五坐标插铣加工专用计算机辅助制造软件,并对该软件生成的刀具轨迹进行了仿真和实际加工验证。结果证明,该方法在一定程度上提高了叶轮零件的粗加工效率。 相似文献
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针对天然石材、人工晶体等材料复杂曲面加工中,初始毛坯与最终产品形状差别较大,粗加工材料去除量大,导致加工效率低、刀具磨耗严重的问题,提出了一种基于线锯加工和点加工协同去除的高效粗坯加工的解决思路。根据线锯加工特点,提出了对最终产品的数字化模型进行分层处理,利用多边形对各层二维外轮廓曲线进行包络,将层与层之间的多边形进行顺序拟合得到相应直纹面模型的建模思路。分析了不同包络多边形边数、连接方式所构建的不同直纹面模型对粗坯加工时间的影响。仿真结果表明,虽然增加多边形的边数或者通过层间旋转可以减小剩余未加工材料体积,但整体粗坯加工时间反而有所增加,从而不利于提高效率。粗坯加工时间可作为综合评价指标来优化构建直纹面模型。 相似文献
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Research on tool path planning method of four-axis high-efficiency slot plunge milling for open blisk 总被引:1,自引:1,他引:0
J. X. Ren C. F. Yao D. H. Zhang Y. L. Xue Y. S. Liang 《The International Journal of Advanced Manufacturing Technology》2009,45(1-2):101-109
The great mass of machining allowance for blisk is removed in the rough milling, so improving the rough machining efficiency for the blisk’s tunnel is the key of realizing high-efficiency machining of blisk. According to the structure characteristic of open blisk’s tunnel, a four-axis plunge slot rough milling with high-efficiency and low machining cost is advanced. First, the plunge slot process for blisk and the generation process of the ruled enveloping surface for the freeform surface of the blisk’s blade are put forward. Then, the generating method of the ruled enveloping surface for the blade’s freeform surface and the tool path generation method of four-axis plunge slot milling for blisk are studied. The rough milling region of open blisk’s tunnel is determined by generating the ruled enveloping surface of blade’s offset surface, and the algorithm of tool path for four-axis plunge milling is given. When using a ruled surface to approach a freeform surface, the problem of getting boundary is solved, and the error from the calculation of tool path is avoided by the algorithm. At last, the experiment shows that comparing to the traditional side slot milling, the cutting force of four-axis plunge milling can be reduced by 60% and even the rough machining efficiency can be increased to more than double. 相似文献
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YI Xianzhong MA Weiguo QIHaiying YAN Zesheng GAO Deli 《机械工程学报(英文版)》2008,21(3):52-57
A new milling methodology with the equivalent normal curvature milling model machining freeform surfaces is proposed based on the normal curvature theorems on differential geometry. Moreover, a specialized whirlwind milling tool and a 5-axis CNC horizontal milling machine are introduced. This new milling model can efficiently enlarge the material removal volume at the tip of the whirlwind milling tool and improve the producing capacity. The machining strategy of this model is to regulate the orientation of the whirlwind milling tool relatively to the principal directions of the workpiece surface at the point of contact, so as to create a full match with collision avoidance between the workpiece surface and the symmetric rotational surface of the milling tool. The practical results show that this new milling model is an effective method in machining complex three- dimensional surfaces. This model has a good improvement on finishing machining time and scallop height in machining the freeform surfaces over other milling processes. Some actual examples for manufacturing the freeform surfaces with this new model are given. 相似文献
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Tool orientation optimization and location determination for four-axis plunge milling of open blisks
Yongshou Liang Dinghua Zhang Zezhong C. Chen Junxue Ren Xiangyu Li 《The International Journal of Advanced Manufacturing Technology》2014,70(9-12):2249-2261
Plunge milling has been widely adopted in the manufacturing industry to rough machine open blisks, and its objective is to remove stock material with high efficiency and machining stability. A current technique challenge is to calculate the tool orientation and locations (called plunger paths) in four-axis rough plunging of open blisks, so that the residual raw material left on the blades after roughing is close to the specified value. To address this challenge, a novel approach is proposed to optimize tool orientation and determine tool locations for four-axis plunge milling of open blisks. First, tool locations are determined with two principles without interfering the blades and hub. Second, tool orientation is optimized according to a new evaluation criterion. Then, considering the impact of previous tool paths, an in-process model of a blisk is used to calculate residual material. Finally, an experiment is conducted to verify this new approach. This approach can promote four-axis plunge milling in the open blisk manufacturing. 相似文献
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整体叶轮五轴侧铣数控加工方法的研究 总被引:7,自引:0,他引:7
为提高整体叶轮的五轴编程和加工的能力,生成合理的刀位文件,在制定出合理的加工工艺的基础上,提出了一种适合于直纹面叶片五轴侧铣加工的刀轴矢量计算方法.对两个相邻叶片的直母线进行插值后,得到的刀轴矢量能完全避免刀具与叶片之间的干涉问题.同时,提出了一种小四边形参数模型来解决直线与自由曲面求交问题,并成功应用于刀心计算中.实例计算表明,所提出的方法能很好地应用于整体叶轮的五轴加工. 相似文献
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Brian S. Dutterer Jennifer L. Lineberger Paul J. Smilie Daniel S. Hildebrand Tres A. Harriman Matthew A. Davies Thomas J. Suleski Don A. Lucca 《Precision Engineering》2014
Single crystal diamond milling of optical materials opens up new design degrees-of-freedom for optical engineers. However, parameters for milling of many optical materials have not been investigated, understood, or documented. This paper focuses on the milling of germanium to fabricate a freeform “Alvarez lens” in the mid-wave infrared (MWIR). While the design concepts for such optical systems have been known for decades, implementation has been limited due to difficulty in manufacturing the freeform surfaces. Ultra-precision, multi-axis machining centers can manufacture these surfaces through single crystal diamond milling. A battery of high speed diamond milling tests was performed in germanium to develop the parameters for machining the Alvarez components. Near-surface crystal quality and residual stress measurements using confocal Raman spectroscopy are reported, along with representative test results of the functioning optical system. 相似文献