共查询到19条相似文献,搜索用时 93 毫秒
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李坤燃 《现代制造技术与装备》2018,(2)
川西地区探井多用小尺寸钻头(6"左右)钻头钻三开后的井段,由于井眼直径小,小尺寸牙轮钻头不但机械钻速慢,而且钻头消耗多、起下钻作业增加。人们研制了一种新型小尺寸钻头,它主要由一个偏置的多锥形牙轮、一个圆柱形滚轮及两个牙掌组成。通过新型单牙轮钻头前期科学研究、产品试制和台架试验,进行相关工艺技术研究及应用,有助于解决川西地区探井小井眼机械钻速慢、钻井效益低的实际生产难题。结果表明,单牙轮钻头钻速接近PDC钻头,远高于三牙轮钻头,具有较好的技术经济指标,值得进一步推广应用。 相似文献
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《机电工程技术》2020,(4)
随着国内勘探力度不断加大,钻井深度不断提高,牙轮钻头在深部地层钻进中发挥着重要作用。在高钻压、高转速下,小尺寸三牙轮钻头硬质合金齿受的动载大,且齿的尺寸相对较小,常常发生硬质合金齿的松动、断裂、脱落。因此,对小尺寸牙轮钻头的硬质合金齿结构进行强度分析研究,具有十分重要的意义。以小尺寸三牙轮钻头硬质合金齿为研究对象,建立了3种牙齿模型;通过ABAQUS软件对硬质合金齿进行静强度分析,获得了牙齿结构Mises应力分布情况;通过Fe-Safe软件对硬质合金齿作疲劳强度分析,获得了疲劳寿命和安全系数;对强度较差的1号楔形齿进行结构优化,强度提升明显;对指导小尺寸牙轮钻头牙齿结构设计具有一定意义。 相似文献
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针对现有的三牙轮钻头性能检测试验装置数据采集系统不稳定等情况,研究设计了钻头性能检测试验装置的监控系统。本监控系统分为操作控制部分、动态数据采集部分以及数据监控软件部分。操作控制部分采用可编程控制器S7200来实现;数据监控软件部分用图形化语言Labview实现。全方位的监控三牙轮钻头检测试验过程的钻速、钻压、钻头进尺等参数,获得准确有效的试验数据,对三牙轮钻头的参数优化设计具有非常重要的意义。 相似文献
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针对扩大景深的定焦虹膜识别系统易引入不同程度的离焦虹膜图像,增加识别错误率的问题,提出稳定特征融合解决方案.以基于序列图像的离焦虹膜识别方法为分析和验证基础,通过对不同图像离焦程度下稳定特征在空域和频域分布规律的统计研究,确定基于单幅图像注册的稳定深点区域特征与稳定傅里叶低频相位特征的提取规则,并将二者在匹配分数级进行融合完成识别.在SUT-DI离焦虹膜数据库上的实验结果表明,与融合前基于单特征的以及基于序列图像的识别方法相比,该方法取得了更佳的识别性能,等误率最高降低7.77%,证明了该方法对于图像遭受光学离焦具有鲁棒性,能够为便捷式虹膜识别系统的开发提供技术支持. 相似文献
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R.N. Ibrhim A.D. McCormack 《The International Journal of Advanced Manufacturing Technology》2002,20(11):817-823
The use of attributed adjacency (AA) feature recognition can encapsulate the engineering significance of a part and represent
it as a matrix or an arc-node graph. This creates a feature recognition technique that involves scanning a matrix or graph
for a combination of zeros (concave relationships/edges) and ones (convex), or smaller arc-node graphs that are predetermined
to be features. AA techniques have often suffered problems when dealing with feature interactions, as a feature found must
be exactly matched with those stored. This paper presents a modification of the AA matrix and employs a new concept for identifying
features and the application in developing software for process planning. A unique feature taxonomy is described, which when
combined with the new feature identification system creates a feature recognition and extraction system that includes curved
surfaces and eliminates the need for separating interacting primitive features. The new system takes its input from neutral
STEP files and produces a list of features with complete information for process planning. cycle, and so automatic feature recognition has its place in manufacturing.
ID="A1"Correspondance and offprint requests to: R. Ibrahim, Faculty of Engineering, Monash University, Caulfield Campus, 900 Dandenong Road, Caulfield East, 3145 Victoria,
Australia. E-mail: raafat. ibrahim@eng.monash.edu.au 相似文献
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在总结特征识别方法的基础上 ,充分考虑轴类部件自身的形状特点 ,应用特征识别技术 ,建立了一个面向装配顺序规划的层次装配特征信息模型。给出了在无需初始化装配的情况下 ,轴类部件装配顺序规划的算法。并在MDT环境中 ,应用MCAD -API技术进行了实现 相似文献
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A recognition process of the features in a part model resorts to the knowledge of an application engineer. The knowledge is
encoded as rules of the recognition procedure at the beginning that are applied to the part model during the recognition process.
Such a human interaction is difficult to control in extracting the intended features because the intended features by the
application engineer may change from one engineer to the other and the external situations. Instead, we treat the result of
the recognition process as a rough extraction and allow the user interactively modify the result. In this paper, we present
a feature recognition system where the user can inspect the result of the recognition and delete recognized features interactively. 相似文献
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A feature recognition system with interactive feature inspection and deletion capabilities 总被引:1,自引:1,他引:0
Dr M. W. Park H. Ko 《The International Journal of Advanced Manufacturing Technology》1996,12(3):190-196
A recognition process of the features in a part model uses the knowledge of an application engineer. The knowledge is encoded as rules of the recognition procedure that are applied to the part model during the recognition process. Such a human interaction is difficult to control in extracting the moulding features because the features moulding of the application engineer may change from one engineer to the other and external conditions may change. Instead, we treat the result of the recognition process as a first approximation of the user's intention and let the user interactively modify the result. In this paper, we present a feature recognition system where the user can inspect the result of the recognition and delete the recognised features interactively. 相似文献