共查询到17条相似文献，搜索用时 140 毫秒
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为了明确影响灌木材端向切削力的主要因素,改进削片机性能,提高灌木材削片质量,笔者研究了不同刀具前角、切削厚度和不同含水率对沙柳(Salix psammophila)材端向切削力的影响。结果表明刀具前角对法向力的影响较小,对主切削力影响较大;切削厚度对主切削力的影响较为明显,随切削厚度的增加,主切削力明显增加;沙柳材含水率15％以下主切削力随含水率增加略有增大,之后逐渐减小,其中含水率在30％-70％之间时,切削力变化不大。 相似文献
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利用有限元软件ANSYS对八机头数控雕刻机切削力进行谐响应分析,首先求出八个主轴切削力在X、Y、Z方向的谐响应幅值变化曲线和数据,然后求出八个机头的动刚度并对其进行研究分析。 相似文献
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为降低伐竹机械工作过程中所受切削力，寻找最优切削参数组合，基于ABAQUS对圆锯片结构进行约束模态分析，对切削竹筒过程进行仿真模拟。通过单因素试验研究了圆锯片转速Vc、进给速度Vf、切削倾角θ和齿数Z对峰值切削力的影响，并以上述4个因素为影响因素，峰值切削力为评价指标进行正交试验以获得优化参数组合。结果表明：峰值切削力随着转速、进给速度和切削倾角的增加先减小后增大，随着齿数的增加而减小。当圆锯片转速为3 000 r/min、进给速度为0.2 m/s、倾斜角度为10°、齿数为40 T时，可在一定程度上降低圆锯片所受切削力，并且切削断面平整。研究结论可为伐竹机械的设计提供参考。 相似文献
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对木质材料切削中比较特殊的一类切削方式———无屑切削的切削机理及切削力进行了理论上的研究,并在单板切条试验机上进行试验验证。研究证明,楔型刀锯进行木质材料无屑切削时,其切削力受木材的树种、切削方向、锯片尺寸、角度参数及切削用量的影响较大。 相似文献
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为探究不同刀具前角与切削厚度对木塑复合材料直角自由切削加工时切削力、切削温度及表面粗糙度的影响,采用直角自由切削方式,以3种不同因素水平设计12组试验,使用高速摄像机、压电测力仪、红外热成像仪分别进行切屑形态拍摄、切削力和切削区域温度的测定。结果表明:刀具前角与切削厚度会直接影响切削力、切削温度及表面粗糙度,且随着切削厚度的不同会产生不同形态的切屑。切削力、切削温度越大,表面粗糙度值也越大,即加工表面质量越差;切削力与切削温度越小,则加工表面质量越好。使用较小前角刀具加工较大切削厚度时,产生连续型切屑时的切削力、切削温度及表面粗糙度均大于使用较大前角刀具进行较小切削厚度加工时产生不连续型切屑时的值。因此,在木塑复合材料实际生产加工过程中,粗加工时可选择大切削厚度快速切除多余材料,精加工时则采用较大刀具前角和较小切削厚度以获得更好的加工表面质量,提升生产效率。 相似文献
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木塑复合材料(WPC)是一种可重复使用的新型环保材料，在其二次加工过程中，表面易出现凹坑、凸起和波纹，致使表面质量差。本文通过分析WPC加工过程中切削力、切削温度和表面粗糙度，研究了刀具前角和每齿进给量对WPC已加工表面质量的影响。结果表明，随着刀具前角的增大，切向切削力Fx和径向切削力Fy、切削温度逐渐减小，表面粗糙度值逐渐降低，提高了已加工工件表面质量。切向切削力Fx和径向切削力Fy随着每齿进给量的增大而增大，切削温度和表面粗糙度值随着每齿进给量的增大而降低。在高切削力和低切削温度情况下，已加工工件表面质量更优，但同时也出现了能耗高的问题，通过对切削参数的调整来改善以上的问题，对WPC的二次加工提供理论依据指导。 相似文献
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按国产GJ-85油锯的结构参数,采用二次回归正交试验设计方法,在试验台上进行一系列模拟试验,对测得的数据进行了分析和处理,得出锯木功率、锯木生产率和单位面积能耗同锯链切削速度、进锯力和锯口长度之间的关系式。根据关系式求出单位面积能耗最小时的锯切状态即最佳匹配时参数。经计算分析,对GJ-85油锯提出了改进提高的理论依据和合理运用的条件。 相似文献
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The experimental results of orthogonal cutting of maple and the modeling of the cutting mechanics are presented. The tool cutting forces were measured for different feed rates. A set of equations relating the tangential and feed forces to the tool edge width and feed rate (chip thickness) to calculate the chip and edge cutting force coefficients was developed. Then the chip force and edge force coefficients were calculated from experimentally obtained cutting forces and were plotted in a polar-coordinate system with respect to the fiber orientation of the maple disk. The polar-coordinate presentation of the cutting force results and the calculated cutting force coefficients provides an excellent visual appreciation of the relation between the cutting forces and the wood fiber orientation. Chips were also collected from various sectors of the wood disk. This analysis further identified the effects of fiber orientation and cutting forces on the types of chip formed and hence the cutting mechanics involved. By applying the calculated cutting coefficients for each tool orientation (in respect to the grain) it is possible to predict the feed and tangential forces for any feed rates. There is good agreement between the predicted and measured cutting forces. 相似文献
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【目的】以实验为基础,研究实木地板榫槽铣削加工中切削参数对切削力的影响,为不同切削工艺下加工参数的优化以及设置提供参考依据,达到提高加工质量、延长刀具寿命并用以指导生产的目的。【方法】以山毛榉材地板为试验材料,运用木材切削机理对切削速度、进给速度及切削宽度3个参数进行单因素试验,并采集切削过程中随着切削参数变化产生的切削力值,揭示在顺铣和逆铣方式下不同切削参数对实木地板榫槽铣削力的影响规律。【结果】在不同铣削方式下,随着切削速度的增大,XYZ方向的切削力总体呈降低趋势;随着进给速度和切削宽度的增大呈现升高的趋势,顺铣加工时XYZ 3个方向的铣削力变化相比逆铣加工的波动趋势小,稳定性要好。通过对铣削力回归模型进行方差分析,可知R2(Fdown)=0.9490,R2(Fup)=0.8516,均接近1,回归效果显著,验证了铣削力模型的合理性。【结论】通过对比相同切削参数在不同工艺条件下产生的切削力变化,可知顺铣加工稳定性高于逆铣加工。 相似文献
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基于提高超高压水射流切割机床加工木材和木质复合材料质量需要,依据动力学实验原理,以杉木为试件,采用动压力测试方法分别对杉木工件在自由状态下切割受力情况和对不同规格的杉木工件在自由状态与夹紧状态下的切割表面粗糙度进行了对比试验研究,并以此设计了与SQ-WJG40型高压水射流切割机床相配套的四气缸联动气压夹紧装置. 相似文献
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The general aim of work reported here was to assist designers and operators of routers and similar tools for cutting wood-composite
boards, by providing a model predicting cutting force components from readily available material properties. This initial
study explored, for edge cutting, the variation within a single medium density fibre board across the thickness and in various
cutting directions in the plane of the board. Material properties of interest were specific gravity and friction coefficient.
In slow linear cutting on a modified milling machine, carbide router inserts cut the edges of layers cut from a medium density
fibre board. Specific gravity and coefficient of sliding friction were measured for each layer. Cuts were also made on full-thickness
edges in various directions in the plane of the board. Chip thickness was varied from 0.025 to 0.8 mm. Parallel and normal
force data and digital video images of chip formation were stored for analysis. Specific gravity increased as the fourth power
of the distance from the central plane to the surface. Friction coefficient values, estimated both from cutting forces and
from rubbing forces during return, varied about a value of 0.23, with no significant difference between layers. The values
for cutting force per mm width of cut increased progressively from the central plane to the surface, in a logarithmic relation
with specific gravity. The cutting forces did not vary with cutting direction in the plane of the board. For a sharp edge
with 32° rake angle cutting at chip thickness values above 0.1 mm, the normal force component was negative, indicating reduced
feed force and improved surface quality. With dulling, the threshold value of chip thickness for this increased. It is concluded
that elaboration of this approach would generate relationships suitable for incorporating in a useful general model. However,
it may be found that weight per unit area of board will suffice as a proxy for cutting resistance in modelling the cutting
of full-thickness edges.
Received 10 June 1999 相似文献
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The determination of particleboard (chipboard) mechanical strength critical stresses and their correlation to a specific cutting force in chipboard milling are introduced. This correlation is based on bending and indentation tests, on a finite elements method (FEM) simulation of the chip formation and flow mechanism in chipboard milling, as well as on cutting force components measurements. The obtained results, by means of these procedures, were used to verify the FEM calculated milling force time course and to explain the chip formation and the cutting force fluctuation. Moreover, owing to these results, the experimentally and analytically determined chipboard and layer elasticity, as well as small and large scale plasticity strength values, were correlated to the corresponding specific cutting force, considering concrete cutting edge revolving positions during milling. In this way, chipboard materials strength critical stresses can be determined automatically, taking into account their correlation to the specific cutting force, individually defined through cutting force components measurements. The developed procedure can be used beneficially in monitoring the mechanical strength properties of chipboards under production conditions. 相似文献