共查询到19条相似文献,搜索用时 62 毫秒
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在微细铣削超硬铝合金过程中,由于工艺系统刚度较小,机床与微径铣刀的振动不仅会造成切削加工过程中铣刀与工件之间的相对位移,甚至会破坏微径铣刀刀体,影响工件表面质量。通过微径铣刀模态分析得到微径铣刀的振型及固有频率,从而判断铣刀是否与机床发生共振。同时通过谐响应分析获得频谱图中最大振幅对应的频率,从而选择最优的模态振型。研究结果表明:微径铣刀不会与机床发生共振;在考虑X方向的切削稳定性时应该避免激励频率在一阶固有频率附近;在考虑Y方向的切削稳定性时应该避免激励频率在二阶固有频率附近;通过对比有效质量的方法,验证了有限元分析的准确性。 相似文献
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微细铣削加工刀具磨损数值模拟的研究 总被引:2,自引:1,他引:1
采用商业有限元DEFORM-3D软件,建立了三维微细铣削加工模型,利用该模型动态模拟了硬质合金微径铣刀铣削加工2A12工件时刀具的磨损变化形态。结果表明,与常规刀具磨损形态不同,微径铣刀的磨损主要发生在刀尖处,后刀面磨损形态为近似三角形。针对这一特点,提出利用后刀面刀尖处的最大磨损高度hmax判断微径铣刀磨损量的方法,研究铣削方式对刀具磨损量影响的变化规律。仿真结果可用于预测刀具磨损变化规律,为微细铣削加工参数的优化、微径铣刀的合理选用、设计及进一步有效控制刀具磨损提供研究手段。 相似文献
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辛元 《世界制造技术与装备市场》1999,(3):30-32
高温材料的逐渐普遍应用,推动相应刀具材料和刀具几何形状的较大发展。与此相似的是,高速主轴和大进给率的发展趋势也促进了小直径专用端铣刀的发展。钻头的发展趋势是提高深径比。同时镗刀和螺纹刀具也在发展中。 相似文献
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剪切机是核燃料处理工程的关键设备,其剪切刀具用于剪切复合材料组件,剪切刀具的工况直接影响整个剪切工作的效率。由于实际生产过程中刀具的磨损非常严重,导致刀具过早失效。通过分析在实际生产过程中刀具出现的主要失效形式——磨损,从而为提高刀具使用寿命提供一定的理论依据。 相似文献
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Cutting Force Analysis in Transient State Milling Processes 总被引:4,自引:2,他引:2
Yawei Li Steven Y. Liang 《The International Journal of Advanced Manufacturing Technology》1999,15(11):785-790
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This paper describes the micro cutting of wear resistant tungsten carbides using PCD (Poly-Crystalline Diamond) cutting tools
in performance with SEM (Scanning Electron Microscope) direct observation method. Turning experiments were also carried out
on this alloy (V50) using a PCD cutting tool. One of the purposes of this study is to describe clearly the cutting mechanism
of tungsten carbides and the behavior of WC particles in the deformation zone in orthogonal micro cutting. Other purposes
are to achieve a systematic understanding of machining characteristics and the effects of machining parameters on cutting
force, machined surface and tool wear rates by the outer turning of this alloy carried out using the PCD cutting tool during
these various cutting conditions. A summary of the results are as follows : (1) From the SEM direct observation in cutting
the tungsten carbide, WC particles are broken and come into contact with the tool edge directly. This causes tool wear in
which portions scrape the tool in a strong manner. (2) There are two chip formation types. One is where the shear angle is
comparatively small and the crack of the shear plane becomes wide. The other is a type where the shear angle is above 45 degrees
and the crack of the shear plane does not widen. These differences are caused by the stress condition which gives rise to
the friction at the shear plane. (3) The thrust cutting forces tend to increase more rapidly than the principal forces, as
the depth of cut and the cutting speed are increased preferably in the orthogonal micro cutting. (4) The tool wear on the
flank face was larger than that on the rake face in the orthogonal micro cutting. (5) Three components of cutting force in
the conventional turning experiments were different in balance from ordinary cutting such as the cutting of steel or cast
iron. Those expressed a large value of thrust force, principal force, and feed force. (6) From the viewpoint of high efficient
cutting found within this research, a proper cutting speed was 15 m/min and a proper feed rate was 0.1 mm/rev. In this case,
it was found that the tool life of a PCD tool was limited to a distance of approximately 230 m. (7) When the depth of cut
was 0.1 mm, there was no influence of the feed rate on the feed force. The feed force tended to decrease, as the cutting distance
was long, because the tool was worn and the tool edge retreated. (8) The main tool wear of a PCD tool in this research was
due to the flank wear within the maximum value of Vmax being about 260 μ. 相似文献
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Application of the Discrete Wavelet Transform to the Monitoring of Tool Failure in End Milling Using the Spindle Motor Current 总被引:3,自引:3,他引:0
The paper presents an application of the discrete wavelet transform to the monitoring of tool failure in end milling operations
using the spindle motor current. The discrete wave-let transform performs a multilevel signal decomposition to extract the
tool failure feature from the spindle motor current. Experimental results have shown that tool failure in end milling operations
can be clearly detected even under varying cutting conditions. 相似文献
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影响车铣复合机床加工精度的因素分析 总被引:1,自引:0,他引:1
刘桂芝 《机械设计与制造工程》2011,(4):68-69,72
影响复合机床加工精度的因素很多,其中主轴系统的精度、机床的动态特性以及刀架的位置精度是影响机床加工精度的主要因素。现对这几个影响因素进行分析,并提出了相应的解决方法。 相似文献
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刀倾半展成法是加工螺旋锥齿轮和准双曲面齿轮的有效方法,螺旋锥齿轮和准双面龄轮数控铣齿机是一种新机床,将齿轮加工所需全部运用用六座标数控来实现,本文研究了如何在这种高科技机床上再现并改进传统加工方法。 相似文献