共查询到18条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
尹逊雨高奇陈野崔天阳张科 《制造技术与机床》2022,(12):107-112
碳化硅颗粒增强铝基复合材料(SiCp/Al)具有优异的材料力学性能,由于SiC颗粒具有较高的硬度使材料加工极其困难。针对体分比为20%的SiCp/2009Al复合材料进行磨削研究,建立了单磨粒磨削有限元模型,对磨削机理和磨削后材料的表面缺陷情况进行仿真分析,并通过磨削试验进行了验证,分析得出形成的表面缺陷有划伤、分层、毛刺、沟痕和凹坑等。根据试验结果,拟合了回归方程,分析了主轴转速、进给速度和磨削深度对表面粗糙度的影响程度。 相似文献
6.
7.
8.
铝基碳化硅颗粒增强复合材料(SiCp/Al)有许多优异的特性,但其加工非常困难,限制了该种材料在工程中的应用。旋转超声辅助磨削加工非常适合中、高体分SiCp/Al复合材料的加工。针对增强体体积分数45%、增强颗粒尺寸3μm、基体材料A12的SiCp/Al复合材料进行了实验研究,分析了加工表面形貌、表面粗糙度和切削力随切削参数的变化规律。实验结果表明,工件加工表面质量较高,表面粗糙度Ra值在0.131~0.340μm之间;切削过程平稳,轴向切削力Fz值在23.33~51.31N。 相似文献
9.
10.
通过用CVD金刚石薄膜涂层刀具切削加工SiC颗粒增强基复合材料的试验,研究了切削参数、刀具材料、刀具几何参数和工件材料对CVD金刚石薄膜涂层刀具磨损的影响规律,同时研究SiCp/Al复合材料的切削加工性能。 相似文献
11.
颗粒增强铝基复合材料小直径孔磨削加工实验研究 总被引:1,自引:0,他引:1
文中使用电镀金刚石砂轮进行A12024/SiCp复合材料小直径孔的磨削加工实验。实验结果表明,利用磨削方法对孔进行加工可以避免出现崩边和崩角缺陷,保证孔的完整;孔的入口和出口尺寸基本一致,孔直径略大于砂轮直径。孔壁的表面粗糙度较低,在实验所采用的加工参数条件下粗糙度在RaO.347-0.578之间。 相似文献
12.
13.
Numerical and experimental studies on the temperature field in precision grinding of SiCp/Al composites 总被引:1,自引:1,他引:0
L. Zhou S. T. Huang C. Y. Zhang 《The International Journal of Advanced Manufacturing Technology》2013,67(5-8):1007-1014
During precision machining of SiCp/Al composites, the temperature of the workpiece surface directly affects the machining quality. In this paper, a triangle heat source model was used to calculate the heat flow during grinding of SiCp/Al composites, then, a three-dimensional finite element method was employed to investigate the temperature distribution at different process parameters, i.e., grinding depth and feed speed of the worktable. In addition, the temperature measures using embedded thermocouple were applied to compare with predictions from the thermal model. The results indicate that the grinding temperature predicted by the finite element method agrees well with the experiment data, and the triangle heat source model was suitable for estimating the workpiece temperature of precision grinding. 相似文献
14.
Li Zhou Shutao Huang Lifu Xu Dashan Bai Peng Zhao 《The International Journal of Advanced Manufacturing Technology》2013,69(5-8):1165-1173
SiCp/Al composites are extensively used in aerospace, automotive, and civil applications, and the machining characteristic of SiCp/Al composites is an issue of great economic impact. This paper presents an experimental investigation of the drilling characteristics during machining of SiCp/Al composites with electroplated diamond drills; the drilling characteristics were evaluated in terms of drilling forces, tool wear, surface roughness, and entrance edge quality. Due to the very different machining properties between the SiC particles and Al alloy matrix, in a broader sense, the edge defect is defined as an undesirable effect generated at the edge of a workpiece after the machining process. The results demonstrate that with the increase of the drilling speed, both the thrust force and torques have no significant increase, while the surface roughness increased quickly. In addition, it is found that the formation of the entrance edge defects was associated with the varying of the drilling force and the electroplated diamond drills were subjected to an extremely rapid flank wear. The primary wear mechanism includes abrasive and adhesive wear of the flank face. 相似文献
15.
The existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology.However,the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied.In this study,32 SiCp/Al specimens with a high volume fraction were prepared and their machining parame-ters measured.The surface quality of the specimens was then tested and the effect of the grinding parameters on the surface quality was analyzed.The grinding quality of the composite specimens was comprehensively analyzed taking the grinding force,friction coefficient,and roughness parameters as the evaluation standards.The best grinding parameters were obtained by analyzing the surface morphology.The results show that,a higher spindle speed should be chosen to obtain a better surface quality.The final surface quality is related to the friction coefficient,surface roughness,and fragmentation degree as well as the quantity and distribution of the defects.Lower feeding amount,lower grinding depth and appropriately higher spindle speed should be chosen to obtain better surface quality.Lower feeding amount,higher grinding depth and spindle speed should be chosen to balance grind efficiently and surface quality.This study proposes a systematic evaluation method,which can be used to guide the machining of SiCp/Al composites with a high volume fraction. 相似文献
16.
Anlin Long Min Wan Wenping Wang Xiangdong Wu Xuexi Cui Chunping Fang 《The International Journal of Advanced Manufacturing Technology》2017,91(1-4):25-37
This study proposes a methodology for helical mill-grinding of tiny internal threads made of hard brittle materials such as SiCp/Al composites. The methodology uses the helical mill-grinding method incorporating with a diamond form-grinding wheel. A mathematical model is established to predict thread form errors and provide a rational range of wheel parameters, such as variation of tool profile angle Δα and ratio of the wheel diameter to the thread major diameter η. Based on the methodology, a grinding wheel is developed for processing the M2 internal threads in a validation experiment. The study demonstrates that an M2 internal thread made of the SiCp/Al composite of 45% SiC volume fraction is successfully machined in 5 min with pitch error <0.08% and angle error <0.3%. The thread profile on the pitch diameter is within the axial equivalent tolerance zone (0–0.016 mm), which indicates that the thread precision reaches the H4 level. 相似文献
17.
采用有限元分析软件ABAQUS建立反映C/SiC复合材料编织结构的三维仿真模型,模拟单颗金刚石磨粒划擦C/SiC复合材料的去除过程,获得划擦过程中材料上的应力、应变分布与磨削力变化曲线.通过试验获得相同划擦条件下的磨削力值,与模拟值比较,平均轴向力误差值为8.9%,平均切向力误差值为11.2%.仿真结果解释了试验中有、... 相似文献
18.
In this study, the effect of wettability improvement of SiCp on the impact and sliding wear behavior of A356/20 wt% SiCp composites produced by a compocasting technique has been investigated. The result showed an increase of incorporation and uniform distribution of SiCp in the A356 matrix by elimination of SiCp segregation. Desired bonding between SiCp and the aluminum matrix due to improved wettability resulted in enhanced properties in terms of improved impact toughness and wear resistance. This improvement was also associated with partial refinement of coarse eutectic silicon due to increased incorporation and distribution of SiCp reinforcements. The highest enhancement was obtained when 1% Mg was added into the melt in addition to pretreated SiCp. The impact toughness value increased by 10 and 26% and the wear rate decreased by 5 and 30% when the SiC was treated and when Mg was added, respectively, compared to as-received SiCp. The impact fracture surfaces showed fewer decohered and well-bonded SiC particles in A356–(SiC-treated-Mg) composite. The highest wear resistance of A356/SiCp composites was achieved by A356–(SiC-treated-Mg) composite for applied loads of 10 and 20 N compared to other fabricated composites. The worn surface revealed mild abrasion and adhesion wear mechanisms. 相似文献