共查询到18条相似文献,搜索用时 343 毫秒
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利用球头铣刀高速铣削Cr12模具钢,研究了切削速度、进给量和切削深度对主轴和刀具切削振动的影响变化规律,结果表明随着切削速度的增加,工件振动增加缓慢,而主轴的振动迅速增加,远超过工件的振动成为主振动,主轴进给方向的振动要小于非进给方向的振动。在小进给时,随着进给速度增加各向切削振动而迅速下降,在大进给速度时,各向振动随进给速度增加保持平稳;各通道的切削振动都随着切削深度的增大而增长,因此在高速铣削过程中,主轴振动为主振动,是影响加工表面质量的主要因素。 相似文献
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徐树滋 《世界制造技术与装备市场》2003,(1):60-60
通常金属切削加工分成粗加工和精加工。粗加工任务是采用低速进给,主轴以较低转速,通过大切深来实现迅速切除毛坯材料并留一定的精加工余量;精加工则是主轴以高转速、快进给、浅切深来实现加工到图样尺寸要求。 以往用两台不同的机床来完成粗加工和精加工,如今追求高效率;采用高速加工中心以高主轴转速,高进给 相似文献
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《制造技术与机床》2017,(6)
探索了高频旋转超声铣削石英玻璃的工艺规律与材料去除机理,检测分析了加工表面粗糙度与表面形貌,借助Matlab平台建模仿真了进给速度和主轴转速对磨粒运动轨迹的影响规律,研究了进给速度、主轴转速、切削宽度以及切削深度对加工表面质量的影响规律与机理。进给速度增大会导致刀具上的单颗金刚石磨粒的切削速度增大,参与切削的摆线平面投影运动轨迹变长,使表面粗糙度随进给速度增加先增大后减小;表面粗糙度值随主轴转速的增大总体上呈现出先减小后增大的趋势,主轴转速为3 000 r/min时铣削表面粗糙度最小;表面粗糙度值随切削宽度增大先增大后减小,切削宽度直接决定相邻刀具路径对应加工区域重叠范围,进而产生不同的磨粒划刻加工叠加效果;随切削深度增大,表面粗糙度值呈现出先增大后减小再增大的趋势,铣削过程中超声振动与切削深度配合产生的近成形表面材料去除模式对表面质量具有关键性作用。研究工作可为石英玻璃旋转超声铣削加工提供一定的工艺基础。 相似文献
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《现代制造技术与装备》2016,(11)
利用硬质合金铣刀,对奥氏体不锈钢AISI 304进行铣削加工实验研究。讨论切削速度和进给率的变化对刀具寿命的影响。实验结果表明,刀具寿命随切削速度的增加而降低,随进给率的增加而增加。以生产率最高和刀具寿命最长为目标,给出单刃铣刀铣削加工的最佳切削参数。 相似文献
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通过球头铣刀高速铣削Cr12淬硬模具钢的实验,研究了切削用量对切削力和表面粗糙度的影响变化规律,并分析了产生这些变化的原因。研究结果表明:在球头铣刀高速铣削Cr12淬硬模具钢时,轴向力远远大于径向力,为主切削力;随着切削速度的增加,切削力和表面粗糙度值虽然呈现下降的趋势,但下降趋势不如普通切削时明显;切削力和表面粗糙度值随进给速度的增加而增加;当轴向切深在较小的范围内,切削力和表面粗糙度值随轴向切深增加而变化很小,只有当轴向切深超过一定值以后,切削力和表面粗糙度值才随轴向切深增加而迅速增加。 相似文献
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李长河 《机械工人(冷加工)》2005,(4)
1 概述超高速磨削是近十几年来在德、美、日等工业发达国家迅速崛起的一项先进制造技术。超高速切削的概念源于德国切削物理学家Salomon博士 1 93 1年所提出的具有划时代意义的假设 :对于给定的某种工件材料 ,切削速度存在一个临界值 ,在该临界值之前 ,切削温度及刀具磨损随切削速度的增大而增大 ;但当切削速度超过该临界值时 ,即在高速区 ,切削速度超过切削温度最高的“死谷”区域时 ,继续提高切削速度将会使切削温度明显下降 ,刀具磨损及单位切削力也随之降低。他的理论给人们一个非常重要的启示 ;如果能越过图 1中的B区 ,而在高速区 (C… 相似文献
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Chih-Cherng Chen Ko-Ta Chiang Chih-Chung Chou Yan-Ching Liao 《The International Journal of Advanced Manufacturing Technology》2011,54(5-8):465-478
Using a diamond cutting tool in the precision turning process, the vibration of tool-tip has an undesirable effect on the machined surface??s quality. The objective of this paper is to present the mathematical models for modeling and analyzing the vibration and surface roughness in the precision turning with a diamond cutting tool. Machining parameters including the spindle speed, feed rate and cutting depth were chosen as numerical factor, and the status of lubrication was regarded as the categorical factor. An experimental plan of a four-factor??s (three numerical plus one categorical) D-optimal design based on the response surface methodology was employed to carry out the experimental study. A micro-cutting test is conducted to visualize the effect of vibration of tool-tip on the performance of surface roughness. With the experimental values up to a 95% confidence interval, it is fairly well for the experimental results to present the mathematical models of the vibration and surface roughness. Results show that the spindle speed and the feed rate have the greatest influence on the longitudinal vibration amplitude, and the feed rate and the cutting depth play major roles for the transverse vibration amplitude. As the spindle speed increases, the overall vibration of tool-tip tends to more stable condition which leads to the results of the best machined surface. The effects of the feed rate and cutting depth provide the reinforcement on the overall vibration to cause the unstability of cutting process and exhibit the result of the worst machined surface. 相似文献
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结合FANUCoi系统VM850加工中心对塑料尼龙材料进行平面加工试验,观察尼龙在特定加工参数条件下的切屑运动方向和形态。利用Daisy8106型三坐标测量机对加工成型的尼龙表面进行平滑度、平行度测量,分析硬质合金铣刀在不同的每齿进给量与切削深度下塑料尼龙工件的铣削表面质量,得出最佳的每齿进给量fz=0.075mm/r、切削深度Δd=6mm。结果表明,在铣削尼龙的过程中,合理采用每齿进给量、铣削深度、主轴转速等工艺参数,能使产品的平滑度及平行度达到加工的高精度要求,实现尼龙的高速和高质量的铣削。 相似文献
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金刚石刀具高速精密切削加工的研究 总被引:7,自引:4,他引:7
采用聚晶金刚石刀具和天然金刚石刀具对LY12高强度铝合金进行了高速精密切削试验 ,系统研究了切削条件、切削用量对加工表面粗糙度的影响规律。结果表明 ,在比常用切削速度高 8倍的高速切削速度范围内(v=80 0~ 12 0 0m/min) ,采用圆弧刃天然金刚石刀具可获得Ra0 0 4~ 0 0 6 μm的高光洁加工表面 ;采用直线刃聚晶金刚石刀具可获得Ra0 0 7~ 0 1μm的光洁加工表面。切削速度对加工表面粗糙度的影响主要受到机床动态特性的制约 ;进给量的选择范围较大 ;背吃刀量对加工表面质量影响极大 ,为获得较小表面粗糙度必须合理选用背吃刀量 相似文献
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Chih-Cherng Chen Nun-Ming Liu Ko-Ta Chiang Hua-Lun Chen 《The International Journal of Advanced Manufacturing Technology》2012,63(5-8):797-815
The vibrations on the cutting tool have a momentous influence for the surface quality of workpiece with respect to surface profile and roughness during the precision end-milling process. Singular spectrum analysis (SSA) is a new non-parametric technique of time series analysis and forecasting. The significant features of the cutting tool vibration signals from the sensors are extracted and transformed from the SSA-processed vibration signals. In the present study, SSA is applied to extract and transform the raw signals of the vibrations on the cutting tool for investigating the relationship between tool vibration and surface roughness in the precision end-milling process of hardened steel SCM440. In this experimental investigation, the spindle speed, feed rate, and cutting depth were chosen as the numerical factor; the cutting feed direction and holder type were regarded as the categorical factor. An experimental plan consisting of five-factor (three numerical plus two categorical) d-optimal design based on the response surface methodology was employed to carry out the experimental study. A micro-cutting test was conducted to visualize the effect of vibration of tooltip on the performance of surface roughness. With the experimental values up to 95% confidence interval, it is fairly well for the experimental results to present the mathematical models of the tool vibration and surface roughness. Results show that the effects of feed rate and cutting depth provide the reinforcement on the overall vibration to cause the unstable cutting process and exhibit the result of the worst machined surface. The amplitude of vibration signals along the cutting feed direction is generally larger than that along other direction. The spindle speed and tool holder type affect the stability of cutting tooltip during the cutting process. 相似文献
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选用涂层硬质合金刀具对300M超高强度钢进行高速铣削试验,通过单因素试验和多因素正交试验法,得出铣削参数(主轴转速、每齿进给量、铣削深度)对切削力及表面粗糙度的影响规律及主次关系。对正交试验结果做最小二乘法分析,建立切削力及表面粗糙度与铣削参数之间的经验模型;对经验模型的回归方程及系数做显著性检验,并对其进行参数优化,得出铣削参数的最优组合。结果表明:主轴转速和铣削深度对切削力的作用较大,而每齿进给量对其影响相对较弱;每齿进给量对表面粗糙度作用最强,铣削深度次之,主轴转速对其作用最弱。 相似文献