共查询到20条相似文献,搜索用时 109 毫秒
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针对滑枕特别是中间轴承孔加工分别介绍了其粗/半精加工的镗杆工装:调挂托架、分体可调刀盘体等;精加工的镗杆工装.为类似工件的加工提供一定的参考. 相似文献
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接力气缸是大型机组中用于控制导水机构导叶张闭的重要部件 ,而缸体内部的加工一直是我厂的难题。从前用普通的浮镗加工缸体内部经常会出现“扎刀”现象 ,尺寸超差 ,或直线性不理想 ,造成返工甚至整个工件的报废 ,我们结合液压原理设计了一套浮镗工装 ,使大型缸体在车床上浮镗加工完成。实践证明在使用本工装后生产效率大大提高 ,加工精度好 ,加工费用低 ,安全可靠 ,具有良好的实用性。而且扩大了加工范围 ,甚至可加工内径在1.2m以上精度要求较高的缸体类零件。图1所示为百龙滩机组的接力气缸缸体 ,它由无缝钢管及16Mn钢板组焊而… 相似文献
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在加工汽车起重机的油缸时,孔内壁容易产生波纹缺陷,成为生产上的技术关键。为了提高油缸孔内壁质量,拟定了油缸孔内壁的加工方法。一、现场加工工艺分析1.加工对象油缸内孔直径为 110~200mm,油缸长度为6.5-9m,油缸材质为45钢和STE47高强度进口钢,正火硬度分别为HB180-220、HB222-263,孔内壁表面粗糙度Ra0.4μm,圆度为0.029mm,内孔公差为H8。2.油缸孔加工工装油缸孔加工采用一次镗-铰-滚压成形,工装是粗镗刀与镗杆用可调固定连接,精镗刀与镗杆是浮动连接,在加工… 相似文献
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在T637数控镗铣床 上使用多工位镗铣胎加工电机接线盒盖板隔爆面,设计了专用工装,取得了很好的应用效果. 相似文献
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《机械工人(冷加工)》1974,(11)
我厂加工TMD-4型1吨模锻锤缸套配件时(图1),由于现有设备生产能力不足,自行设计制作了一套镗缸套工装,在普通C630车床上,以小攻大,完成了缸套的加工任务。 鏜缸套工装结构见图2。工件19沿轴向固定在支架4,8的凹槽内,用三个双头螺栓夹紧。镗杆1的一端顶在主轴顶尖上,另一端顶在尾架14装有滚动轴承的活动顶尖上,用千分表找正。支架4、8及尾架14的底部均有V形槽,可沿床面纵向移动,以调节其轴向位置。丝杠3两端用支架2夹持在镗杆1上。棘轮9固定在丝杠右端,并随镗杆一起转动。由于棘爪16的作用, 相似文献
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应用六西格玛方法提高CQ公司后桥壳总成精镗专机加工效率.通过对精镗专机设备故障和工装调整分析,找出影响设备故障的关键因子,对于工装调整的问题点进行快速改善,影响设备故障的非关键因子进行生产维护预防,不能即时改善的关键因子运用鱼骨图进行更深入的分析改进,确认改进效果,巩固研究成果,使得后桥壳总成精镗专机每天停线时间从89min降低至30min,加工效率提高14.1%. 相似文献
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机车发动机机体主轴孔的镗修,目前在全国范围内尚无高效率的专用设备。文中对机车发动机机体主轴孔加工专用组合镗床的镗杆利用I-DEAS Master series 5.0软件系统进行了有限元分析。分别分析了不安装浮动支承和安装浮动支承两种情况下的镗杆振型,证明在安装浮动支承之后,镗杆的挠度可以满足机床的要求,对超长镗杆的设计和性能分析具有一定的参考价值。 相似文献
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OPTIMIZATION OF HOLLOW CANTILEVERED BORING BAR STIFFNESS 总被引:2,自引:0,他引:2
Precision line boring is a very demanding application in terms of both quality and production rate requirements. Machining of long bores as needed in cam and crankshafts of engine blocks requires use of dedicated equipment. In this research, cantilevered boring bar mechanics, in particular bar stiffness, is studied. First, the effects of shape optimization are studied, including the effect of hollowing the boring bar. Secondly, the effects of reinforcing a bar with axial reinforcement materials are studied, followed by a derivation of the equations for deflections, natural frequency of vibration, and stiffness. Finally, finite elements are used to verify these equations. 相似文献
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针对碳纤维增强复合材料(CFRP)制件深孔内齿槽镗削的加工,设计了一种具有导向支撑结构和刀尖自动伸缩功能的专用镗杆。利用ANSYS Workbench分别对普通刀杆和专用镗杆进行静力学分析,结果表明专用镗杆的受力变形较小,具有较高的静刚度。联合Hypermesh与ANSYS分别对普通镗杆和专用镗杆进行动力学分析,结果表明专用镗杆的固有频率并没有降低,且能有效减小共振振幅,具有良好的动态性能。 相似文献
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ABSTRACT Precision line boring is a very demanding application in terms of both quality and production rate requirements. Machining of long bores as needed in cam and crankshafts of engine blocks requires use of dedicated equipment. In this research, cantilevered boring bar mechanics, in particular bar stiffness, is studied. First, the effects of shape optimization are studied, including the effect of hollowing the boring bar. Secondly, the effects of reinforcing a bar with axial reinforcement materials are studied, followed by a derivation of the equations for deflections, natural frequency of vibration, and stiffness. Finally, finite elements are used to verify these equations. 相似文献
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主轴内孔的加工是大型电机研制的重要环节,而镗杆的减振设计是保证内孔加工质量的关键因素之一。为了设计出具有最佳减振效果的镗杆,提高镗孔质量,文章根据项目的具体设计参数,首先提出了4种镗杆的设计方案并进行了说明。然后应用有限元软件对4种方案进行了谐响应分析。结果表明:长径比大的镗杆,在镗杆中部加硬质合金棒和阻尼橡胶,并在橡胶中插圆钢,可在提高刚度的同时增强吸振能力,大大提高镗杆的抗振性。 相似文献
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Xianli Liu Qiang Liu Shi Wu Rongyi Li Haining Gao 《The International Journal of Advanced Manufacturing Technology》2018,98(1-4):95-105
In deep hole boring process, long and flexible boring bars are often used. Due to the large length-to-diameter ratio, the stiffness of the boring bars is inevitably reduced, where the boring bars’ vibration effects will occur. The influences of vibration will significantly degrade the accuracy and the surface quality, or even lead failure of the production. Therefore, it is of significant importance to develop techniques to reduce vibration in deep hole boring. In this paper, a new boring bar with a variable stiffness dynamic vibration absorber (VSDVA) is presented, where the basic parameters of the proposed boring bar are measured. Based on the proposed dynamic model, the vibration characteristics of the proposed boring bar are analyzed, and the change laws of the vibration reduction performance are obtained under different excitation frequencies. A new vibration reduction method is proposed, where best vibration reduction performance can be achieved by adjusting the stiffness of the VSDVA. Finally, the vibration reduction performance of the proposed boring bar is validated and evaluated by boring experiments. These works could provide guidance for designing new types of boring bars, selecting cutting parameters, and adjusting the vibration reduction performance of the proposed boring bar, and as a result, it provides a new design idea for the design of boring bar. 相似文献
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主轴内孔加工技术的研究是大型电机研制的重要环节.文中首先根据项目要求提出了四种镗杆的设计方案并加以分析.然后根据四种方案进行了相应的有限元静态分析,分析结果表明方案四由于形成框架结构,且在镗杆尾部插有硬质合金棒,其刚性提高,静变形最小. 相似文献