共查询到19条相似文献,搜索用时 128 毫秒
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采用添加一定量铁族金属Co的Na2O-Al2O3-B2O3-SiO2系陶瓷作为金刚石磨粒的陶瓷-金属结合剂,利用粉末注射成型和埋砂烧结法,设计制备一种具有一定长径比和宏观尺寸(1 mm×1 mm×10 mm)新型金刚石纤维,能按照使用要求进行有序排布,采用这种新型金刚石纤维替代传统金刚石磨粒能制备出有序化金刚石纤维砂轮。对金刚石纤维的抗折强度、硬度等性能进行测定,开展单根金刚石纤维试件与普通陶瓷砂轮加工超硬材料SiC增强高硅铝合金的对比试验。结果表明,制备的新型金刚石纤维具有一定的强度和硬度,其中的陶瓷-金属结合剂对作为切削主体的金刚石磨粒润湿性好、把持力强,金刚石磨粒不易脱落;新型金刚石纤维具有很好的加工性能,较之普通陶瓷砂轮加工工件表面质量更好,实现超硬材料SiC增强高硅铝合金的精密加工;新型金刚石纤维中,有效金刚石磨粒占有较高的百分比,分布较均匀,磨粒出刃等高性好,有效参与切削的磨粒数多,磨粒利用率高;新型金刚石纤维中,金刚石实现三维意义上的分布,即上层磨粒在磨耗磨损失去切削能力或在承受较大的摩擦和挤压力而脱落的情况下,下层磨粒得以出露继续发挥切削能力。 相似文献
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采用4个不同排布方式的钎焊金刚石砂轮和1个电镀金刚石砂轮磨削天然黑色花岗石,用薄片热电偶检测磨削弧区温度信号,同时测量了磨床主轴的功率。通过分析温度信号中高频热脉冲的个数,确定金刚石砂轮实际参与磨削的磨粒数量和有效磨粒比,并计算出磨削过程中单颗金刚石磨粒的实际最大切削厚度及其消耗的切削功率。 相似文献
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混凝土锯切加工过程的基本特征 总被引:1,自引:0,他引:1
通过金刚石单颗粒划伤、金刚石单个节块锯切和金刚石锯片锯切系列试验,对混凝土锯切加工过程中的切屑形态和切削区表面形貌,以及切削力等基本特征进行了详细讨论。结果表明:金刚石锯片锯切混凝土的过程表现为高速锯切过程中金刚石锯片的冲击引起混凝土表层断裂破碎,水泥石子等在切削区内层受到金刚石磨粒的微切削作用形成粉屑,以及钢纤维和钢丝发生金属塑性变形断裂或被拔拉而断裂的过程。在粘性水泥粉屑以及金刚石磨粒的挤压作用下,多种形态的切屑易粘结成团,并粘附到混凝土锯切表面和锯片节块上而导致锯片堵塞。 相似文献
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锯切花岗石过程中金刚石串珠的磨损特性 总被引:1,自引:0,他引:1
通过跟踪烧结式金刚石绳锯切割花岗石过程中串珠直径磨损及串珠表面金刚石磨粒的磨损,研究串珠的磨损规律,并建立金刚石串珠的磨损模型。进行金刚石绳锯切割花岗石试验,试验结果表明,在金刚石串珠锯切过程中,单颗串珠沿其轴向出现不均匀磨损。串珠前端的磨损量会明显大于串珠中、后端磨损量,串珠后端的磨损也略大于串珠中端的磨损,串珠呈现腰鼓状磨损;串珠前端金刚石磨粒的平均出露高度高于串珠中、后端的磨粒平均出露高度,但在岩屑的磨蚀作用下,串珠前端的高出露金刚石磨粒容易产生非正常脱落。串珠磨损可分为腰鼓形状成形及腰鼓形状保持两个阶段。在切削负荷及岩屑磨蚀的共同作用下,串珠前、中、后三个部分在两个阶段的磨损表现各不相同。串珠前端是以岩屑磨蚀为主,而对于串珠中端,则是主要承受切削负荷。串珠后端两种作用的影响程度相对较弱。 相似文献
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细粒度金刚石砂轮形貌测量与评价 总被引:6,自引:0,他引:6
采用基于扫描白光干涉原理的三维表面轮廓仪对粒度为3 000的金刚石砂轮表面形貌进行测量,其图像拼接功能可以确保较高的横向分辨率、较高的垂直分辨率和较大的取样面积。利用频谱分析方法对砂轮表面的频率构成进行分析,通过理想的低通数字滤波消除测量仪器引起的系统噪声和砂轮表面的高频分量,然后重建砂轮表面的三维形貌,在此基础上得出砂轮的磨粒出刃高度、静态有效磨粒密度、磨粒平均间距。研究表明,采用细粒度金刚石砂轮进行超精密磨削时,磨粒出刃高度大体上服从正态分布,静态有效磨粒密度远低于理论磨粒密度,真正起切削作用的磨粒数量极少。 相似文献
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邵堃 《江苏机械制造与自动化》2007,36(6):94-95,99
采用冲击压缩法(SCM)合成的多晶体金刚石磨粒,设计了磨削光学玻璃的实验装置。实验结果表明,采用该方法磨削光学玻璃,与单晶体金刚石磨粒磨削光学玻璃相比,采用多晶金刚石磨粒加工光学玻璃能得到良好的加工表面。 相似文献
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Circular cutting with a single point diamond cutting edge, in which the depth of cut is very small but reaches a maximum at one point, has been carried out in order to investigate the cutting of sialon and/or partially stabilized zirconia under conditions similar to grinding. This has been carried out by investigating the sliding phenomenon of a diamond cutting edge, the normal cutting force, groove profile, stock removal and so on. It has become clear that there are three different regions within the cut: elastic, plastic and cutting regions are all present when there is interference between a diamond grain and a fine ceramic. A cutting groove is generated by plastic deformation as well as brittle fracture. 相似文献
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粗粒度人造多晶金刚石用作超精切削加工刀具材料的可能性 总被引:1,自引:2,他引:1
用粗粒度的人造多晶金刚石刀具进行车削试验.从理论和实验两方面对此种刀具切削形成超精密加工表面的机理进行了研究,提出了"微量切削过程中.人造多晶金刚石刀具多点切削、单点成形"的观点。在与天然单晶金刚石刀具的切削试验结果以及天然单晶金刚石刀具超精切削加工生产条件进行对比之后,验证了粗粒度人造多晶金刚石用作超精切削加工刀具材料的可能性。 相似文献
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For the technology of diamond cutting of optical glass, the high tool wear rate is a main reason for hindering the practical application of this technology. Many researches on diamond tool wear in glass cutting rest on wear phenomenon describing simply without analyzing the genesis of wear phenomenon and interpreting the formation process of tool wear in mechanics. For in depth understanding of the tool wear and its effect on surface roughness in diamond cutting of glass, experiments of diamond turning with cutting distance increasing gradually are carried out on soda-lime glass. The wear morphology of rake face and flank face, the corresponding surface features of workpiece and the surface roughness, and the material compositions of flank wear area are detected. Experimental results indicate that the flank wear is predominant in diamond cutting glass and the flank wear land is characterized by micro-grooves, some smooth crater on the rake face is also seen. The surface roughness begins to increase rapidly, when the cutting mode changes from ductile to brittle for the aggravation of tool wear with the cutting distance over 150 m. The main mechanisms of inducing tool wear in diamond cutting of glass are diffusion, mechanical friction, thermo-chemical action and abrasive wear. The proposed research makes analysis and research from wear mechanism on the tool wear and its effect on surface roughness in diamond cutting of glass, and provides theoretical basis for minimizing the tool wear in diamond cutting brittle materials, such as optical glass. 相似文献
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使用Murakami溶液和王水预处理高钴硬质合金刀片,并用直流磁控溅射(DCS)技术在此硬质合金上溅射铝过渡层,在热丝化学气相沉积(HFCVD)设备里沉积金刚石薄膜;分析了金刚石形核机理,并利用SEM以及Raman等方法表征试样。结果表明:与未溅射过渡层的样品相比,在过渡层上的金刚石形核密度更高,金刚石颗粒尺寸更加细小。 相似文献
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The paper describes a method of determining the temperature field under real conditions of the cutting of natural diamond monocrystals using a thermograph. The advantages of the thermography over the method of artificial thermocouples are discussed. The temperature distribution along the cutting direction is given and temperature kinetic dependencies are explained. It is shown that under severe cutting conditions the crystal temperature can reach values close to the diamond graphitization temperature. In those cases single large wear particles of diamond appear. 相似文献