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采用一种新型阵列微孔吸附金刚石多层有序排布法制备了体积分数为20%的多层有序排布金刚石锯片, 对比研究了多层有序排布金刚石锯片和随机分布金刚石锯片在加工罗源红花岗岩时的锯切电流和单颗金刚石磨粒所受的切向锯切力, 对切割加工实验后锯片中金刚石磨粒不同磨损形态进行了观察和统计, 分析了金刚石有序排布对锯片切割性能及金刚石磨粒磨损特征的影响。结果表明, 阵列微孔吸附有序排布金刚石锯片的锯切电流和单颗金刚石磨粒所受的切向锯切力比磨粒随机分布锯片低; 在干切和湿切条件下, 有序排布金刚石锯片的脱落磨粒占总磨粒比率比随机分布金刚石锯片低, 宏观破碎和微破碎磨粒占总磨粒比率比随机分布金刚石锯片高。 相似文献
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研究了花岗石锯切过程中金刚石锯片刀头的磨损状况,对刀头结合剂和金刚石磨粒的磨损机理进行了分析,并探讨了金刚石磨粒的磨损形态对金刚石锯片锯切性能的影响。 相似文献
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采用与主磨料粒度相差较大的金刚石微粉作为辅磨料,设计和制备了13种不同配方的金刚石小锯片进行切割混凝土的试验,实现主辅磨料双切削共同作用。通过混凝土切割实验和理论分析,研究金刚石辅磨料对金刚石锯片寿命和切割效率的影响。结果表明,在锯片中加入适量浓度的细颗粒金刚石作为辅磨料,能较大幅度提高混凝土金刚石锯片的切割效率及使用寿命。金刚石作为辅磨料可协助主磨料共同参与切割混凝土,能加快锯片的新陈代谢,使单位切削面上的受力点增多,且减小金刚石颗粒之间的间距,使大于金刚石间距的砂粒磨削不到胎体,从而减少砂粒对胎体的磨损,金刚石锯片的使用寿命最多可提高150%以上,切割效率提高约40%。 相似文献
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采用共沉淀法制备了不同铜铁配比(质量比:45:35、50:30、55:25)的铜基预合金粉末,利用真空热压法烧结得到含金刚石的铜基结合剂刀头,通过激光焊接的方法制备出铜基结合剂金刚石锯片,研究了铜基预合金粉末中铜铁含量(质量分数)对金刚石锯片性能的影响。利用扫描电子显微镜观察锯片断面的显微组织形貌,并测量不同铜铁含量锯片的硬度和磨损量。结果表明:在三种配比中,当铜和铁质量比为50:30时,铜基结合剂与金刚石间的结合最佳,锯片性能最好,硬度最高(HRB 118),锯片的磨损量最少(1.16 g)。 相似文献
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简要介绍了金刚石锯片的发展历程、最常使用的金刚石锯片生产工艺流程,并对其成本进行了分析。从影响金刚石锯片生产成本的各个方面,提出了降低金刚石锯片生产成本的方法。重点分析了金刚石的品级、粒度和浓度对成本的影响,论述了金刚石锯片金属胎体的选择,金刚石表面金属化在金刚石锯片生产中的使用以及改进锯片的结构和生产工艺对成本优化的影响。 相似文献
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叙述了一种新型高效、耐用人造金刚石圆盘锯牛刀头为试验应用情况。该刀头具有大刚石色镶性能好,工作寿命长,生产效率高的特点,与普通金刚石锯片相比,在切割七级硬度岩石时,可提高切割效率25%,提高切割寿命48.5%。 相似文献
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以Fe-30%Cu(质量分数)合金粉末、单质Sn粉和Cu粉的混合粉末为基体,分别用W/Cr/Ni混合粉末和WC/Cr3C2/Ni混合粉末作为添加剂,制备金刚石锯片胎体材料,并利用加压烧结方法制备金刚石锯片。分析胎体材料的致密度、组织结构和力学性能以及金刚石锯片的切割性能。结果表明:胎体中添加Ni-W/Cr或Ni-WC/Cr3C2后,硬度、冲击韧性和抗弯强度最大增幅分别达到19.2%、11.7%和6.9%,致密度由96.50%降至93.1%~94.8%;胎体材料中添加2.44%W和2.44%Cr(体积分数)的金刚石锯片具有最优的干切性能,磨耗比和切割速率分别达到105.3 m/mm和1.66 m/min;添加4.36%WC和0.67%Cr3C2(体积分数)的金刚石锯片具有最优的湿切性能,磨耗比和切割速度分别达到109.6 m/mm和2.17 m/min。 相似文献
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采用电解法对电镀法、热压烧结法和钎焊法制备的金刚石刀头进行腐蚀,将腐蚀后的金刚石与原始金刚石进行粒径、表面形貌、透明度、色度等的比较和分析,并对金刚石进行常温冲击强度(TI)和热冲击强度(TTI)测试,研究金刚石工具的制作方法对金刚石性能的影响。结果表明,镀液浸泡和热压后金刚石粒径基本无变化,钎焊使金刚石尺寸变大;使金刚石表面形貌粗糙度由大到小、透明度由差到好和色度值由小到大的制备方法依次为真空钎焊、热压烧结和电镀。冲击强度测试表明,每种方法制作的金刚石工具腐蚀后,金刚石的TI和TTI值都有所下降,下降幅度从大到小依次为真空钎焊、热压烧结和电镀。 相似文献
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51CrV4钢因具有良好的热处理性能与力学性能,广泛用作为高等级弹簧钢。为改善现有锯片钢的不足,根据51CrV4特有的化学成分,创新性地将其用于制造金刚石焊接锯片基体。通过研究动态CCT曲线,卷取温度对显微组织与第二相析出物的影响,淬火与回火工艺对碳化物尺寸、晶粒尺寸、力学性能的影响,评估了51CrV4钢用于制造金刚石焊接锯片基体的可行性。结果表明:卷取温度升高,先共析铁素体尺寸与珠光体片层间距变大,10 nm粒径以下的(V,Cr)C析出物在MC相析出物中所占的比例减少;淬火温度由800提高到900 ℃时,奥氏体晶粒尺寸先缓慢变化,随后快速长大,固溶的碳化物质量分数增多,回火后锯片硬度增强,而回火温度由450提高到550 ℃时,马氏体板条界片层状渗碳体逐步球化,强度明显下降,塑性小幅提高;设定合适的卷取温度控制热轧态中第二相碳化物的尺寸,并在850~900 ℃淬火、约450 ℃回火是生产高硬度、高韧性51CrV4金刚石焊接锯片的关键工艺。 相似文献
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BA Degnan S Macfarlane ME Quigley GT Macfarlane 《Canadian Metallurgical Quarterly》1997,34(5):290-296
OBJECTIVE: It was hypothesized that there is an inverse relationship between resin-enamel bond strength and bonded cross-sectional area, and that there are regional differences in resin-enamel bond strength. METHODS: The facial and lingual surfaces of extracted human third molars were ground down 0.3 mm using 240 grit abrasive paper and were then bonded with either Clearfil Liner Bond 2 or Scotchbond Multi-Purpose Plus adhesive systems using the manufacturer's instructions. The bonded surfaces then received a resin composite build-up. After 24 h of storage in water, the bonded teeth were vertically serially sectioned into 1.0 mm thick slabs using a diamond saw, and the bonded surface area at the resin-enamel interface was varied from 0.5 to 3.0 mm2 using a diamond saw under microscopic observation. The trimmed region was varied from the occlusal third of the facial or lingual enamel to the middle third, to the cervical third. The trimmed specimens were then glued to a Bencor Multi-T device, placed in an Instron testing machine and stressed to failure at 1 mm/min. A three-factor ANOVA was used to compare bond strengths (buccal vs. lingual, occlusal vs. middle vs. cervical-third, vs. materials). Regression analysis was used to examine the relationship between bond strength and bonded cross-sectional area for each material on occlusal enamel. RESULTS: For both bonding systems, there was a highly significant (p < 0.001) inverse exponential relationship between tensile bond strength (y axis) and bonded cross-sectional area (x axis) with y intercepts of 51 and 59 MPa for Clearfill Liner Bond 2 and Multi-Purpose Plus, respectively. Using both materials, the highest bond strengths were measured in the occlusal third, which were significantly higher (p < 0.05) than those made to cervical enamel. SIGNIFICANCE: Like resin-dentin bonds, resin-enamel bonds exhibit an inverse relationship with cross-sectional area. This relationship becomes more apparent at bonded surface areas below 2 mm2 and is probably due to reductions in the number of interfacial stress-raisers as samples are made smaller. 相似文献