共查询到20条相似文献,搜索用时 182 毫秒
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《机械设计与制造》2017,(8)
针对铣削加工具有薄壁或深腔特征的高体积分数SiCp/Al结构件时工件边棱处出现的崩边现象,使用铣磨加工SiCp/Al复合材料的方法,通过田口实验设计对高体积分数SiCp/Al进行加工实验,研究了不同的铣磨工具类型和加工参数对铣磨力和表面粗糙度的影响规律,并对实验结果进行了主效应和方差分析。表明使用120#的烧结金属金刚石铣磨工具加工SiCp/Al时获得的铣磨力最大;使用120#的不开槽电镀金刚石铣磨工具加工时获得的表面粗糙度最大。最佳的铣磨力参数组合为使用开槽电镀120#的铣磨工具在加工参数在主轴转速n=6000r/min,进给速度v_f=50 mm/min,径向切深a_e=0.01mm;使用金属结合剂120#的铣磨工具在加工参数为主轴速转n=12000r/min,进给速度v_f=100mm/min和径向切深a_e=0.01mm下获得较小表面粗糙度值。 相似文献
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赵华光 《机械工人(冷加工)》1956,(6)
我厂磨工周增荣改进了磨轴的工具,使磨削光轴和多台轴,只要一次装卡就能磨好一根。提高了工作效率2倍多,并保证了质量。使用磨轴工具的情形如图1,1是装在磨床主轴内的死顶尖;2是磨床拨盘;3是工具本体圆盘,用螺钉 相似文献
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黄伟馨 《机械工人(冷加工)》1958,(10)
根据陶瓷刀具在实际生产中使用的经验来看,它刃磨和精磨正确与否,直接影响到陶瓷刀片的使用寿命和效果。所以这里建议把陶瓷刀片的刃磨和精磨工作,集中起来专门由工具车间来做,磨好以后,再发到车间使用。苏联的先进生产者告诉我们,切削工具装了陶瓷刀片以后,它的切削性能不但 相似文献
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趙华光 《机械工人(热加工)》1956,(6)
我厂磨工周增荣改进了磨轴的工具,使磨削光轴和多台轴,只要一次装卡就能磨好一根。提高了工作效率2倍多,并保证了质量。使用磨轴工具的情形如图1,1是装在磨床主轴内的死顶尖;2是磨床拨盘;3是工具本体圆盘,用螺钉固定在拨盘2上;4是压缩弹簧(共两 相似文献
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针对小直径精密深孔加工中珩磨加工的特点、珩磨工具的设计以及工艺问题进行了分析研究,举例分析了加工效果。所设计的两种珩磨工具具有刚性好、切削效率高、易于操作等特点,有着良好的实用价值。 相似文献
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液压阀孔的精加工,多年来,一般采用的工艺是:铰削→研磨→抛光。这种工艺的加工效率低,废品率高,加工质量难以保证。为了改变这一落后工艺,天津市液压件厂和天津砂轮厂、天津制刷厂合作,研制出电镀超硬磨料镗磨工具和挠性磨孔器(见图1)。从而使阀孔精加工工艺改为:刚性镗铰→电镀超硬磨料镗磨工具珩磨→挠性磨孔器抛光。 相似文献
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东辛采油厂着手于偏磨井的治理较早,近两年进行了江苏扶正杆、HEPE/EXPE高密度聚乙烯内衬油管和防磨接箍等防偏磨工具及模式的优化工作,延长了检泵周期,取得较好效果。 相似文献
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针对非均匀磨损套管进行了空间有限元分析,研究了磨损量、磨损长度、轴向拉力对套管抗内压强度的影响.计算结果表明非均匀磨损套管的抗内压强度随磨损厚度的增加而降低;不同的磨损长度对套管抗内压强度影响不明显,即抗内压强度主要受磨损厚度的影响;套管轴向拉力对其抗内压强度影响不大,并且这种影响随着磨损量的增加而逐渐减小.通过对磨损套管抗内压强度变化规律的研究,为合理制定井控措施提供了科学依据. 相似文献
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Carrying capacity of the casing will reduce after the casing is worn, which seriously affects the subsequent well drilling, well completion, oil extraction and well repair. A lot of researches on calculation of casing wear collapse strength have been done, but few of them focus on collapsing failure mechanism, and influencing factors and law of collapse strength. So, significant difference between estimated value and actual value of collapse strength comes into being. By theoretical analysis, numerical simulation and actual test, the collapsing failure mechanism of casing wear as well as the influencing factors and laws of collapse strength are investigated, and the investigation results show that collapse of crescent casing wear belongs to "three hinged" instability. The severely-worn position on the casing is yielded into the plastic zone first then deformed greatly, which causes the plastic instability of the whole structure. The casing wear collapse strength presents changes of exponent, power function and linear trend with the residual casing wall thickness, wear radius and axial load, respectively. When the flexibility is less than 10°/30 m, the borehole bending has less impact on casing collapse strength. Thus, the computation model for the casing wear collapsing strength is established by introducing wear radius coefficient and casing equivalent yield strength, at the same time, the model is tested. The test results show that the relative error for the computation model is less than 5%. The research results provide a basis for design of the casing string strength and evaluation of down-hole safety. 相似文献
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为提高刀具润滑性能,尽量减少切削液的使用,制备出在刀屑界面持续润滑的新型刀具,能够将切削液通过微通道直接输送到刀屑接触界面内部。采用该新型刀具与普通刀具在干切削和浇注切削液条件下分别进行切削45钢试验,测量了切削三向力,对刀具前刀面磨损面进行SEM微观形貌分析及元素检测,分析了刀具的摩擦磨损特性及润滑机理。试验结果表明,与普通刀具在干切削和浇注切削液条件下相比,刀屑界面持续润滑刀具能够有效减少切削过程中的摩擦磨损,而切削液用量只有传统浇注式切削的1/120。分析前刀面的元素可知,切削液能够更加深入到离主切削刃更近的区域,并能持续供给,这是该刀具具有更好的减摩抗磨效果的主要原因。尽管新型刀具的黏结情况大大缓解,但刀具的磨损机理仍然以黏结磨损和氧化磨损为主。 相似文献
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全尺寸石油套管冲击滑动复合磨损试验机的研制 总被引:1,自引:0,他引:1
介绍了一种新型石油套管磨损试验机的工作原理和检测方法,该试验机能模拟存在钻井液介质润滑条件时钻杆接头外壁与套管内壁之间以恒定加载、脉动加载或冲击加载工况下的套管磨损状况。试验前钻杆接头试件被固定在一个可上下直线运动的滑动平台上,固定不动的套管试件有间隙地套住钻杆接头试件。试验时利用变频调速电机驱动钻杆接头试件旋转,同时由液压伺服系统推动滑动平台下行带动钻杆接头试件外壁挤压套管试件内壁实现恒定或脉动加载,或者由偏心轮机构驱动滑动平台先上行后下落来带动钻杆接头试件对套管内壁进行冲击。在数据采集方面该试验机综合利用多种传感检测技术、数据采集和软件处理方法实现了对试件的线性磨损量、接触载荷、摩擦因数和近摩擦表面温度等摩擦学参数的在线测试。初步试验结果表明可利用该试验机对套管磨损问题进行系统的试验研究,从而为深入研究套管磨损机制提供技术支持。 相似文献
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P. Palanisamy I. Rajendran S. Shanmugasundaram 《The International Journal of Advanced Manufacturing Technology》2008,37(1-2):29-41
Tool wear prediction plays an important role in industry for higher productivity and product quality. Flank wear of cutting
tools is often selected as the tool life criterion as it determines the diametric accuracy of machining, its stability and
reliability. This paper focuses on two different models, namely, regression mathematical and artificial neural network (ANN)
models for predicting tool wear. In the present work, flank wear is taken as the response (output) variable measured during
milling, while cutting speed, feed and depth of cut are taken as input parameters. The Design of Experiments (DOE) technique
is developed for three factors at five levels to conduct experiments. Experiments have been conducted for measuring tool wear
based on the DOE technique in a universal milling machine on AISI 1020 steel using a carbide cutter. The experimental values
are used in Six Sigma software for finding the coefficients to develop the regression model. The experimentally measured values
are also used to train the feed forward back propagation artificial neural network (ANN) for prediction of tool wear. Predicted
values of response by both models, i.e. regression and ANN are compared with the experimental values. The predictive neural
network model was found to be capable of better predictions of tool flank wear within the trained range. 相似文献
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刮板链条是埋刮板输送机的牵引及承载构件,需要连续、顺利地通过机槽,却经常因为各种因素造成与机壳侧板发生磕碰、摩擦,碰弯刮板、磨损刮板端部、磨穿机壳侧板.目前采用的增加机壳厚度,选用耐磨性能更好的材料,增设耐磨衬板,刮板加厚或者端部堆焊耐磨焊条,加大机槽宽度、降低刮板链条运行速度等措施,提高埋刮板输送机的制造和安装精度,... 相似文献
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