共查询到20条相似文献,搜索用时 93 毫秒
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对自主研制的T形结构超精密磨床进行改装,在超精密磨床的转台上安装单点金刚石圆弧车刀,进行了超精密车削试验研究。对超精密磨床和车床的结构、精度、刚度进行了分析和比较,确定在超精密磨床的基础上可以进行超精密车床的改造;通过调整静压导轨和刀具静压回转台的供油压力实现超精密车削刀具与工件回转中心高度的精确调整,可有效地实现工件回转中心区域的加工;利用刀具回转台的精密摆动实现刀具切削过程中切削刃位置的微调,为超精密车削提供可能。采用上述方法进行铝合金和无氧铜工件端面不同速度和不同进给量下的超精密车削试验,获得了表面粗糙度为10.8nm的超精密平面。 相似文献
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《世界制造技术与装备市场》2005,(2):153
采用小型高速主轴的切削加工
使用装有直线滑板的所谓瑞士型车床,要想在车削中心上完成零部件的全部加工,需要使用回转刀具.这种刀具可进行径向钻孔、铣削和攻丝.但是,相对于转塔车床来说,带直线导轨的车削中则缺少必要的驱动力. 相似文献
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《世界制造技术与装备市场》2005,(2):i025-i025
采用小型高速主轴的切削加工 使用装有直线滑板的所谓瑞士型车床,要想在车削中心上完成零部件的全部加工,需要使用回转刀具。这种刀具可进行径向钻孔、铣削和攻丝。但是,相对于转塔车床来说,带直线导轨的车削中则缺少必要的驱动力。 相似文献
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袁必谦 《机械工人(冷加工)》1992,(5)
我们在车削已拉削完矩形花键孔的工件时(图1),因切削工件处于断续切削,受冲击力大,很难保证精度要求。于是我们对夹具进行了改进,利用矩形锥度花键心轴6(图2),及所增加的浮动定位套5、7(共 相似文献
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研制车削中心产品的探讨华北工学院专科学校杨胜利太原第一机床厂商振亚,刘智泉车削中心是为了满足复杂机械零件加工、适应其加工工艺复合的需要而在数控车床发展过程中发展起来的新产品。它除具有数控车床切削加工功能外,利用C轴及其回转刀具可进行纵横向钻孔、钻偏心... 相似文献
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本文对键侧和键底留有磨削余量的矩形花键轴滚刀提出了用直线刃代替常用的曲线刃的方法,这可简化滚刀的设计和制造,改善滚刀侧刃的切削性能,并使滚出的花键轴键侧截形呈鼓形曲线,有利于提高键侧的磨削质量和砂轮的耐用度. 相似文献
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分析了旋挖钻入岩问题的本质,介绍了无网格方法;利用无网格法建立了岩石的掘削模型,探索了无网格法在入岩研究上的现存问题,为解决旋挖钻入岩问题提供了新的思路. 相似文献
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Wang Cai Yaoxiong He Congxin Li 《The International Journal of Advanced Manufacturing Technology》2007,32(9-10):911-917
Staggered teeth type rotary burr is a new cutter with a special rotary surface. Since branch cutting edges are interlaced with main cutting edges on the sphere of the rotary burr and only main cutting edges pass by the zenith of the ball, it greatly widens the chip flutes and improves machining properties of cutter teeth nearby the zenith. The machining properties of staggered teeth type rotary burr are better than general ball-end rotary burr’s. Although it is widely used, the research of rotary burr with staggered teeth is not great. In this paper, firstly the helical cutting edge equations on sphere are built. Then, based on the geometry model of helical cutting edge, a helical stagger teeth design is presented and theory of grinding helical grooves of staggered teeth is studied in detail. The smooth spiral rake surface and flank surface can be formed during one-pass grinding process by this method. At last, the validity of the theory given in the paper is identified by example of grinding. 相似文献
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We examined cutting point temperature and tool wear in driven rotary cutting. Cutting tests under dry and minimum-quantity-lubrication (MQL) conditions of stainless steel (SUS304) were carried out. Cutting point temperature was measured using a tool-work-thermocouple method at various cutting speeds. Cutting point temperature tends to increase with increased cutting speed. In driven rotary cutting, cutting point temperature was lower than that of non-rotation cutting. At high-speed cutting of 500 m/min, cutting point temperature was over 1200 °C in the non-rotation tool, but 1000 °C with driven rotary cutting. In addition, when driven rotary cutting was used with MQL, cutting point temperature was decreased to 900 °C. The magnitude of tool wear corresponded almost precisely to cutting point temperature. Severe adhesion on the rake face was observed and resulted in progressive wear on the rake face in rotary cutting at a cutting speed of 100 m/min. The appropriate cutting speed range passively shifts higher from the viewpoint of cutting temperature with rotary cutting. 相似文献
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Rotary ultrasonic machining of brittle materials, such as glass, ceramics, silicon, and sapphire, has been explored in a large number of experimental and theoretical investigations. Mechanistic models have been developed to predict the material removal rate or cutting force in the rotary ultrasonic machining of brittle materials. However, most merely describe the rotary ultrasonic machining process of drilling holes in brittle materials. There are no reports on the development of a cutting force model for flat surface rotary ultrasonic machining, i.e., rotary ultrasonic face milling. This paper presents a mathematical model for the cutting force in the rotary ultrasonic face milling of brittle materials under the assumption that brittle fracture removal is the primary mode of material removal. Verification experiments are conducted for the developed cutting force model and show that the trends of input variables for the cutting force agree well with the trends of the developed cutting force model. The developed cutting force model can be applied to evaluate the cutting force in the rotary ultrasonic face milling of brittle materials. 相似文献
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旋转超声钻削的切削力数学模型及试验研究 总被引:3,自引:0,他引:3
通过分析硬脆材料脆性断裂去除机理和旋转超声加工特点,确定旋转超声加工时单颗磨粒的切削时间、切削深度、切削速度及切削轨迹长度,建立旋转超声恒进给率钻削硬脆材料的切削力数学预测模型。光学玻璃加工试验研究表明,切削力随进给速度的增大而增大,随主轴转速的提高而减小;在高进给速度条件下,切削力对主轴转速的变化更为敏感,在低主轴转速条件下,切削力对进给速度的变化更为敏感;从而很好地验证了已建立的切削力数学预测模型。旋转超声加工和普通加工的对比试验表明,旋转超声钻削加工可以有效降低切削力,一定程度上减小出孔崩边尺寸,从而提高加工效率、降低加工成本。根据旋转超声加工的表面粗糙度值略高于普通加工,提出硬脆材料脆性断裂去除时磨粒实际切削深度决定加工表面粗糙度的判断。 相似文献
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基于Hermite插值的复杂光学曲面车削加工路径规划 总被引:4,自引:0,他引:4
为解决复杂光学曲面加工难题,探讨其车削加工路径规划。基于慢刀伺服加工技术对复杂光学曲面的刀位点规划进行设计,分析刀触点等角度离散方案及刀具圆弧半径补偿方案。轨迹插补采用可编程多轴控制器(Programmable multi-axiscontroller,PMAC)提供的位置、速度、时间(Position velocity time,PVT)插补运动模式,分析PVT的数学实质Hermite分段插值模型,并根据此模型提出恒速法、面积法和三点法三种PVT入口参数生成算法。以离轴抛物面、环曲面、正弦面为例进行仿真,加工路径的仿真表明刀位点的设计可以应用于复杂光学曲面加工。同时z轴运动特性的分析表明z轴往复频率和C轴回转频率相仿时,面积法(c=2/3)和三点法均能满足z轴速度光顺要求;z轴往复频率明显大于主轴频率时,采用三点法的加速度变化明显优于面积法。提出的加工路径方法可为复杂光学曲面的实际加工提供指导意义。 相似文献