基于正交试验的淬硬模具钢球头铣削加工表面粗糙度研究

采用正交试验法研究整体硬质合金球头铣刀铣削加工淬硬模具钢Cr12Mo V时切削参数对零件加工表面粗糙度的影响。设计了以主轴转速、每齿进给量、径向切深、侧偏角和前倾角为主要因素的5水平5因素正交试验,通过极差分析和方差分析方法研究了切削参数对表面粗糙度的影响规律,明确了主要影响因素。结果表明:表面粗糙度随每齿进给量和径向切深的增大而增大,随主轴转速的增大而减小,随侧偏角和前倾角的增大呈现出先减小后增大的趋势,各因素的影响程度从大到小依次为每齿进给量、径向切深、主轴转速、侧偏角、前倾角。     

小直径球头铣刀铣削淬硬钢的试验研究

通过采用直径为 1 5mm的TiAlCN涂层硬质合金球头铣刀对S136淬硬模具钢进行中高速干式切削实验 ,分析了淬硬钢铣削时切削速度、进给速度和切削深度对切削力的影响规律 ,分析了不同切削用量对铣削过程的振动和噪声的影响 ,提出了合理选择切削参数的原则和改善加工过程稳定性的途径     

涂层PCBN刀具切削淬硬模具钢的试验研究

采用涂层PCBN刀具对淬硬模具钢(Cr12MoV)进行切削试验,研究不同切削用量和刀尖圆弧半径对切削力和表面粗糙度的影响规律,并采用极差法评估各因素对切削力和表面粗糙度的影响程度。试验结果和分析表明:采用涂层PCBN刀具切削淬硬模具钢时,切削力和表面粗糙度的部分变化规律有别于传统切削理论。主要原因为:淬硬模具钢硬度高、导热性差,属于难加工材料;试验中选用的TiAlN涂层PCBN刀具有较大的负倒棱(0.12mm×-25°)和刀尖钝圆半径(42μm)。另外,通过极差分析的结果可知,切削深度对切削力的影响最大,刀尖圆弧半径对加工表面粗糙度影响最大。     

淬硬模具钢超声辅助铣削力的试验研究

淬硬模具钢是一种典型的难加工材料,随着航空航天科技的发展,淬硬模具钢的应用领域越来越广泛。近年来,随着大功率超声振动技术的应用及其研究的不断进展,大量的试验研究表明,超声加工在淬硬材料加工方面,与传统的磨削加工和高速加工相比具有独特的优越性。主要对淬硬模具钢SKD61在进给方向一维超声振动铣削过程中的铣削力进行试验研究,研究结果表明:在机床转速、进给量、切深、步距和振幅这5个工艺参数中,振幅对铣削力的影响较为显著,这充分证明了超声振动加工在淬硬材料加工方面的优势。同时,通过单因素试验,获得了机床转速、进给量和切深对不同方向铣削力的影响规律。     

响应面法在高速加工切削参数优选中的应用

讨论了响应面法的原理及应用，结合回归统计建立了淬硬模具钢高速铣削表面粗糙度的经验公式，并分析了切削速度、进给率和轴向切削深度对表面粗糙度的影响规律，为高速加工切削参数的选择和表面质量的控制提供依据。     

小直径铣刀铣削淬硬钢深窄型腔的实验研究

采用Φ2 mm TiAlN涂层硬质合金铣刀对S136淬硬模具钢的深窄型腔进行中高速干式切削实验,研究走刀方式、螺旋下刀半径、螺旋角、切削深度、切削速度、进给速度等因素对切削力和振动的影响规律,为优化小直径铣刀铣削高硬材料模具深窄型腔的工艺参数提供依据.     

TiAI合金薄壁件铣削加工切削力与表面粗糙度研究

钛铝合金是一种新型的轻质高温结构材料,拥有良好的物理和力学性能,适用于航空发动机叶片等领域.通过用球头铣刀铣削加工钛铝合金薄壁件的正交试验,分析了切削参数对铣削钛铝合金薄壁件切削力和表面粗糙度的影响,建立了基于切削参数的切削力及表面粗糙度的指数预测模型.研究表明,对切削力的影响因素重要性由大到小依次为轴向切深和每齿进给...     

淬硬钢Cr12高速铣削力实验研究

对淬硬钢Cr12进行了高速铣削实验研究,研究了铣削速度、背吃刀量、进给速度对铣削力的影响。研究表明:铣削力随着铣削速度的增加而减小,当铣削速度增加到一定的值后其下降趋势变得平缓;铣削力随背吃刀量的增大而增大,且变化显著;铣削力随进给速度的增加而增加,但增加不大。     

氮气油雾介质下淬硬模具钢高速铣削时铣削力的研究

文中基于“绿色制造”理念,在干铣削、空气油雾、氮气油雾介质下进行了淬硬模具钢高速铣削的铣削力试验研究,分析了铣削力随铣削长度、铣削速度、径向进给、轴向进给及每齿进给的变化规律。发现氮气油雾介质能有效地降低铣削力。     

球头刀高速铣削铝合金切削力的试验研究

采用切削力理论分析与实验相结合的方法,建立了高速铣削常用的球头铣刀的铣削力数学模型.通过实验数据拟合了高速铣削状态下铝合金LY12的铣削速度与单位铣削力之间的关系.并通过铝合佥材料LY12高速铣削切削力的实验,验证了球头铣刀高速铣削力的数学模型.     

高速铣削过程中表面粗糙度变化规律的试验研究

在高速铣削试验的基础上 ,研究分析切削速度与进给量对加工表面粗糙度的影响。试验数据表明 ,切削速度的提高有利于改善加工表面粗糙度 ,当切削速度超过某一范围后 ,随切削速度的进一步提高 ,加工表面粗糙度的降低并不明显 ,有时还会使表面粗糙度增加。根据试验结果 ,对具体工件材料与刀具材料匹配选择合理的切削速度与进给量范围 ,可以获得最小加工表面粗糙度值     

Study on cutting force and surface micro-topography of hard turning of GCr15 steel

This work investigates the cutting force and surface micro-topography in hard turning of GCr15 bearing steel. A series of experiments on hard turning of GCr15 steel with polycrystalline cubic boron nitride (PCBN) tools are performed on a CNC machining center. Experimental measurements of cutting force, 3D surface micro-topography, and surface roughness of the workpiece are performed. The 3D surface micro-topography of the workpiece is discussed, and the formation mechanism of the 3D surface is analyzed. The influence of cutting speed and feed rate on cutting force and surface roughness are discussed. The 2D and 3D surface roughness parameters are compared and discussed. It is found that feed rate has greater influence on cutting force and surface roughness than cutting speed and there exists the most appropriate cutting speed under which the minimum surface roughness can be generated while a relatively small cutting force can be found. Recommendations on selecting cutting parameters of hard turning of GCr15 steel are also proposed.     

高速铣削蠕墨铸铁的切屑形成及表面质量研究

蠕墨铸铁(Compacted Graphite Iron)因具有优异的综合力学性能而被广泛应用于汽车和机车行业。由于蠕墨铸铁的可加工性较差,在加工过程中仍然存在许多问题。本文通过单因素试验法,在不同切削速度/进给速度的组合下进行铣削试验,揭示了高速铣削蠕墨铸铁(RuT400)的切屑形成和工艺参数对表面质量的影响。通过测量铣削力和表面粗糙度,用最小二乘法建立工艺参数与铣削力和表面粗糙度之间的拟合方程,并从宏观和微观的角度观察切屑的形成。结果表明,拟合方程的铣削力和表面粗糙度与试验数据吻合度较高,可为铣削力和表面粗糙度预测提供参考。通过扫描电子显微镜(SEM)观察低切削速度和进给速率下产生的长卷型切屑,发现所有切屑均呈“C”形弯曲形状。切屑厚度和锯齿间距与进给速率的增加呈负相关,与切削速度的增加呈正相关。通过计算蠕墨铸铁的临界冲击速度并加以修正,得到了崩碎状切屑出现的实际临界冲击速度,为工艺参数优化和切屑形态变化预测提供了理论基础。     

Effects of cutting edge geometry, workpiece hardness, feed rate and cutting speed on surface roughness and forces in finish turning of hardened AISI H13 steel

In this study, the effects of cutting edge geometry, workpiece hardness, feed rate and cutting speed on surface roughness and resultant forces in the finish hard turning of AISI H13 steel were experimentally investigated. Cubic boron nitrite inserts with two distinct edge preparations and through-hardened AISI H13 steel bars were used. Four-factor (hardness, edge geometry, feed rate and cutting speed) two-level fractional experiments were conducted and statistical analysis of variance was performed. During hard turning experiments, three components of tool forces and roughness of the machined surface were measured. This study shows that the effects of workpiece hardness, cutting edge geometry, feed rate and cutting speed on surface roughness are statistically significant. The effects of two-factor interactions of the edge geometry and the workpiece hardness, the edge geometry and the feed rate, and the cutting speed and feed rate also appeared to be important. Especially honed edge geometry and lower workpiece surface hardness resulted in better surface roughness. Cutting-edge geometry, workpiece hardness and cutting speed are found to be affecting force components. The lower workpiece surface hardness and honed edge geometry resulted in lower tangential and radial forces.     

精密车削Cr12模具钢的表面粗糙度研究

对Cr12模具钢进行了高速精密车削试验,研究了切削速度和进给量对加工表面粗糙度的影响。结果表明:提高切削速度和减小进给量有利于改善Cr12模具钢的加工表面质量;但切削速度超过某一范围后,进一步提高切削速度不能明显降低表面粗糙度;进给量超过一定范围后,表面粗糙度会明显增大。     

Optimization of cutting conditions for minimum residual stress,cutting force and surface roughness in end milling of S50C medium carbon steel

Residual stresses are usually imposed on a machined component due to thermal and mechanical loading. Tensile residual stresses are detrimental as it could shorten the fatigue life of the component; meanwhile, compressive residual stresses are beneficial as it could prolong the fatigue life. Thermal and mechanical loading significantly affect the behavior of residual stress. Therefore, this research focused on the effects of lubricant and milling mode during end milling of S50C medium carbon steel. Numerical factors, namely, spindle speed, feed rate and depth of cut and categorical factors, namely, lubrication and milling mode is optimized using D-optimal experimentation. Mathematical model is developed for the prediction of residual stress, cutting force and surface roughness based on response surface methodology (RSM). Results show that minimum residual stress and cutting force can be achieved during up milling, by adopting the MQL-SiO₂ nanolubrication system. Meanwhile, during down milling minimum residual stress and cutting force can be achieved with flood cutting. Moreover, minimum surface roughness can be attained during flood cutting in both up and down milling. The response surface plots indicate that the effect of spindle speed and feed rate is less significant at low depth of cut but this effect significantly increases the residual stress, cutting force and surface roughness as the depth of cut increases.     

模具钢高速切削表面粗糙度的试验研究

用硬质合金刀具对NAK80模具钢进行了高速精密切削试验,研究了切削条件、切削用量对加工表面粗糙度的影响。切削试验结果表明:提高切削速度与减小进给量有利于改善模具钢工件的加工表面质量;当切削速度超过某一范围后,随着切削速度的进一步提高,加工表面粗糙度的降低并不明显。     

Analysis of surface roughness and cutting force components in hard turning with CBN tool: Prediction model and cutting conditions optimization

In this study, the effects of cutting speed, feed rate, workpiece hardness and depth of cut on surface roughness and cutting force components in the hard turning were experimentally investigated. AISI H11 steel was hardened to (40; 45 and 50) HRC, machined using cubic boron nitride (CBN 7020 from Sandvik Company) which is essentially made of 57% CBN and 35% TiCN. Four-factor (cutting speed, feed rate, hardness and depth of cut) and three-level fractional experiment designs completed with a statistical analysis of variance (ANOVA) were performed. Mathematical models for surface roughness and cutting force components were developed using the response surface methodology (RSM). Results show that the cutting force components are influenced principally by the depth of cut and workpiece hardness; on the other hand, both feed rate and workpiece hardness have statistical significance on surface roughness. Finally, the ranges for best cutting conditions are proposed for serial industrial production.     

铝合金高速切削表面粗糙度的实验研究

使用硬质合金刀具对LY12高强度铝合金进行了高速精密切削试验。研究了切削条件、切削用量对加工表面粗糙度的影响。高速切削试验表明:提高切削速度与减小进给量有利于改善铝合金工件的加工表面质量;当切削速度超过某一范围后,随着切削速度的进一步提高,加工表面粗糙度的降低并不明显。     

Surface roughness and cutting forces modeling for optimization of machining condition in finish hard turning of AISI 52100 steel

An experimental investigation was conducted to analyze the effect of cutting parameters (cutting speed, feed rate and depth of cut) and workpiece hardness on surface roughness and cutting force components. The finish hard turning of AISI 52100 steel with coated Al₂O₃ + TiC mixed ceramic cutting tools was studied. The planning of experiment were based on Taguchi’s L₂₇ orthogonal array. The response table and analysis of variance (ANOVA) have allowed to check the validity of linear regression model and to determine the significant parameters affecting the surface roughness and cutting forces. The statistical analysis reveals that the feed rate, workpiece hardness and cutting speed have significant effects in reducing the surface roughness; whereas the depth of cut, workpiece hardness and feed rate are observed to have a statistically significant impact on the cutting force components than the cutting speed. Consequently, empirical models were developed to correlate the cutting parameters and workpiece hardness with surface roughness and cutting forces. The optimum machining conditions to produce the lowest surface roughness with minimal cutting force components under these experimental conditions were searched using desirability function approach for multiple response factors optimization. Finally, confirmation experiments were performed to verify the pertinence of the developed empirical models.