切削参数对人造板切削力影响的研究

通过对中密度纤维板和刨花板的闭式切削实验,研究了不同锯齿前角、切削厚度、切削速度等参数对切削力的影响规律。结果表明:主切削力和法向力皆随前角的增大而呈减小趋势;通常情况下,相同锯齿前角切削时,刨花板的主切削力和法向力皆比中纤板大。切削厚度对切削力的影响显著,主切削力和法向力均随切削厚度增加而增加。切削速度对切削力的影响相对较小,随着切削速度的增加,主切削力和法向力均略有减小。     

椭圆活塞切削力的影响因素研究

文章对不同刀具前角、不同切削速度、不同切削深度、不同刀具刃口钝圆半径以及不同频率对工件应力应变及切削力的影响进行了仿真研究,分析了在不同参数影响下主切削力和背吃刀力的变化情况。     

刀具磨损对竹材铣削能耗的影响

研究了竹材加工时,刀具磨损对切削功率的影响,得出不同刀具楔角在不同磨损程度下切削功率的计算模型.随着刀具的变钝和刀具楔角的增大,切削力和切削功率不断增加.铣削功率与刀具磨损量、刀具楔角均存在着良好的正相关线性关系.     

超声振动车削参数对切削力的影响

为了探究超声振动车削(UVT)过程中刀具振动频率、振幅和切削速度3个参数对切削力的影响,课题组通过建立有限元模型,对高强度铝合金超声振动车削和普通车削(CT)过程进行了对比研究。首先,研究了切削区域的Mises应力分布的变化;其次,对切削区域温度和微观切屑形态进行了分析,从微观层面揭示UVT方法降低切削力和切削温度的机理;最后,分别研究了刀具振动频率、振幅和切削速度对UVT平均切削力的影响。研究表明:超声振动车削的有限元仿真结果与"刀具-工件接触比理论"一致;在一定的范围内,增大刀具振动频率或振幅以及降低切削速度的方法可以有效降低切削力。文中的研究显示合理的选择超声振动车削工艺参数可以降低切削力,改善高强度铝合金的制造工艺。     

硬质合金刀具切削钛合金切削参数的优化

切削用量对已加工表面粗糙度、表面硬度、刀具磨损度都有很大影响,切削用量选择是否恰当在企业实际生产中有着非常重要的作用。通过硬质合金刀具干切削Ti6A14V钛合金,采用单因素试验法,分析切削用量对切削力的影响。试验结果表明:在切削三要素中,切削深度和进给量对切削力的影响较大,切削速度对切削力的影响较小,由此优选出合理的切削用量。     

对木工指接铣刀侧刃0°前角的否定

以往在对木工指接铣刀切削部分的设计中,习惯地忽视了刀侧刀的切削作用和对其前角的选取,严重地影响了刀具的切削性能。为了正确地认识刀侧刃前角,本文将通过对刀侧刃后角的计算和确定刀侧刃前角对切削力切削功率切削热的影响的分析论证木工指接铣刀侧刃前角与刀尖刃前角一样,都是第一位的重要参数不容忽视。     

螺旋槽丝锥几何参数对切削力的影响

螺旋槽丝锥结构复杂,刀具寿命较短,为了研究螺旋槽丝锥的切削性能,对螺旋槽丝锥进行受力分析,建立丝锥的力学模型。用SolidWorks建立螺旋槽丝锥的三维模型,用仿真软件Advant EdgeFEM模拟螺旋槽丝锥攻丝过程;采用正交试验法分析HSS-Co-PM ASP2030高速钢螺旋槽丝锥加工AISI-4/30合金结构钢时的切削性能;利用极差分析法研究螺旋槽丝锥几何参数端面前角γ_p、切削锥角κ_r、沟槽螺旋角ω对切削力的影响。试验结果表明:沟槽螺旋角对切削力的影响最大,其次是端面前角和切削锥角。螺旋槽丝锥加工合金结构钢取沟槽螺旋角35°,切削锥角12°,端面前角2°时切削力最小,能有效提高刀具寿命。     

基于ABAQUS的高温合金GH4169切削力仿真研究

为了研究镍基高温合金加工中切削用量对切削力的影响,课题组借助高温合金的材料本构模型、失效准则、切削过程中的切屑分离准则和摩擦模型,利用ABAQUS有限元分析软件建立了镍基高温合金的二维切削仿真模型,分别以切削速度、切削深度和进给量为单一变量,探究切削力的变化规律。结果表明:切削力随切削速度的增加而减小,并趋于稳定状态;切削力随着进给量和切削深度的增大而增大;相较于切削速度,进给量和切削深度对切削力的影响更大。     

低速切削木材的声辐射分析

成功的木材机械加工自动机需要精确和连续的了解加工状况(例如,刀具磨损的程度和速度及加工表面的光洁度).通常通过测量切削力,刀具振动和功率消耗来监测加工过程.通过研究,着手确定木材加工的声辐射信号源,及用监测器测定加工过程中声辐射信号源的强弱程度.发现剪切区域的塑性变形,木片(切屑)在刀具前面上的滑动,工件表面在刀具后面上的摩擦和木片的断裂可能是声辅射源.在低速切削白枞木时,试验了各种切削参数(前角,后角,接触长度,试件温度,压尺压榨率)对声辐射源的影响,测定出刀具尖端剪切区域塑性变形的变化是声辐源变化的主要原因.声辐射单个的尖顶脉冲变化率与切削力之间没有相应的统计学关系,但趋向是对实测的切削条件敏感,而对声辐射信号的均方根不敏感.     

SiCp/Al复合材料的车削仿真研究

为了分析SiCp/Al复合材料的切削力形成机理,同时考虑SiCp/Al复合材料加工性能以及成本问题,课题组建立了SiCp/Al复合材料的工件和切削刀具二维有限元仿真模型.利用ABAQUS有限元分析软件动态模拟SiCp/Al复合材料的车削过程,通过改变切削速度和刀尖圆弧半径2个切削参数,得到了SiCp/Al复合材料切削力...     

Parallel and normal cutting forces in peripheral milling of wood

In this paper, the parallel and normal cutting forces on the tip of the tool are examined when altering a number of parameters in peripheral milling. The parameters studied are rake angle, chip thickness and upward/downward milling. The evaluation of the forces has been performed during cutting of the chip and the variation in the forces has been recorded. In this way, important information can be obtained in order to arrive at cutting data and tool geometries that will reduce surface defects such as torn and raised grain. In the past, very few investigations have been carried out on peripheral milling, probably because of the difficulties of measurement. Nowadays, however, new measuring techniques and equipment make it possible to measure cutting forces even in standard milling machines. In this work, a sensor was placed under the workpiece to measure the forces in three directions at frequencies up to 7000 Hz. To obtain detailed data, a plastic material was used so that the cutting (revolution) speed could be kept at a minimum, thereby maximizing the number of readouts per incision. The results show how the normal force (the force component perpendicular to the workpiece) varies during the cut and how it is dependent on the examined parameters. This force changes from negative to positive during the cut. When altering the machining parameters, the normal force changes in both direction and magnitude. The other force component, the parallel force, also shows a dependence on the parameters. The objective of this research is to find parameters that minimize the normal forces in order to avoid damage to the wood.     

木材切削力的研究

本文用拉丁方正交表安排试验，进行切削力的研究。分析切向力Ｆｘ和法向力Ｆｙ与切削厚度、刀具角度、刀具材料及刀具磨损等因素之间的关系。     

Study on the normal component force in oblique cutting of wood

Based on a series of experiments, the relationships between normal component forces and oblique angles of cutting edge, and normal rake angles in oblique cutting of wood were studied. The experiments consist both of the 90°-0° and the 0°–90° oblique cutting situation. Each type of experiment includes two wood species and two kinds of thickness. Through the experiments, the rules of the effect of oblique angles of cutting edge and normal rake angles on normal component force were found out. The calculation methods of normal component force were studied by mathematical analysis.     

金刚石复合片刀具磨损机理研究

选用平均粒度10微米的金刚石复合片制成刀具,对高硅铝合金（Al-30wt%Si）进行切削实验。通过扫描电子显微镜分析了工件的形貌以及金刚石刀具前后刀面磨损的微观形貌。其磨损程度与切削路程为线性关系,金刚石刀具的磨损主要是后刀面机械摩擦磨损以及前刀面的粘接磨损,而没有出现像立方氮化硼刀具的化学磨损以及月牙洼磨损。     

Microbevel for cemented tungsten carbide wood cutting tools

The microbevel method for increasing the rake angle of carbide tools was investigated. Relationship between the microbevel width, angle and the fracture of the cutting edge was established for cutting dry western hemlock knots. Also wear rate of microbevelled tool was investigated. Relatively small microbevel widths at a 30° bevel angle completely prevented edge and corner breakage of carbide tools with rake angles up to 50. Unbevelled carbide tools failed at rake angles larger than 30°. Tool life was not affected by the microbevel.     

Ultrasonic cutting of foods with inclined moving blades

Cutting with devices excited by ultrasound is a promising alternative to conventional cutting when the materials contain particles which differ in stiffness and elasticity from the surrounding bulk or when they consist of layers which exhibit largely differing mechanical properties. Aim of the present study was to evaluate the impact of ultrasonic excitation and blade inclination (slice-to-push ratio) on cutting forces and cutting work of different foods with a fast-moving device which was excited in a way that the direction of vibration was parallel to the edge of the blade. The results show that ultrasonic excitation significantly reduces cutting force, that the magnitude of cutting force reduction largely depends on the product, and that cutting force and cutting work increase with increasing cutting velocity. Whereas these interactions are because of the micro-saw movement of the cutting tool, it was not possible to explain the product-dependent response to blade inclination.     

Effects of cutting parameters on cutting forces and surface quality of black spruce cants

The effects of rake angle, cutting direction, and depth of cut on cutting forces and surface quality of black spruce were evaluated. Cutting forces were measured during cutting at four rake angles (35°, 45°, 55° and 65°), four cutting directions (0°–90°, 15°–75°, 30°–60°, and 45°–45°), and three depths of cut (1, 2, and 3 mm). Torn grain, waviness, and roughness were evaluated. The results showed that as rake angle increased, cutting forces, torn grain, waviness, and roughness decreased. The lowest cutting forces and the best surface quality were obtained with 65° of rake angle. At this angle, cutting forces and surface quality were more affected by depth of cut than by cutting direction variations. Thus, as depth of cut decreased, the effects of cutting orientation on the cutting forces and surface quality decreased. The application of these results to the canting work of a chipper-canter is analyzed.     

沙生灌木切削特性与采伐机具的研究

对内蒙古西部地区的沙生灌木资源状况及其采伐现状进行了调查研究,对柠条材的锯切力进行了测试,分析了锯切功率,并设计了以小四轮拖拉机为动力源的沙生灌木采伐机具。     

PcBN刀具硬态干切削条件对切屑形貌的影响

通过对PcBN刀具硬态干切削GCr15轴承钢的试验研究,观察分析研究了不同切削条件对切屑形貌的影响。结果表明,随着切削速度的增加,切屑锯齿化程度也越高,当切削速度大于200m/min时,切屑类似于挤裂状;随着进给量的增加,切屑的锯齿化程度越来越明显,且在进给量达到0.5mm/r时,切削产生严重变形;随着背吃刀量的增加,切屑的卷曲程度越大,但对锯齿化影响并不大,但当背吃刀量为0.05mm时,切削基本呈带状。