共查询到19条相似文献,搜索用时 125 毫秒
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翟宝隆 《机械工人(热加工)》1989,(3):31-33
铍青铜、各类铜合金、弹性合金,钛合金、沉淀硬化不锈钢及各种光亮淬火或真空淬火后的零件,都需要进行真空回火,以保证得到无氧化的光亮零件。而目前国内外生产的真空回火炉,由于大多是内热式,结构复杂,有的真空度还不高,而且价格昂贵,每台少则几万元,多则十几万元,所以一般中、小型企业很少使用,限制了真空热处理工艺的广泛使用。 相似文献
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对钛合金和不锈钢焊接性进行分析,介绍了国内外钛合金和不锈钢连接技术的发展现状,提出一种新型焊接方法:真空热轧焊接,并采用Nb作为中间层进行了钛合金和不锈钢真空热轧连接研究。 相似文献
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分别以铬酸阳极氧化(CAA)和氢氧化钠阳极氧化(SHA)两种方法,处理用于钛合金/钛合金胶接试样的TB8钛合金表面,通过拉伸剪切试验测量了钛合金/钛合金胶接试样的剪切强度,分析了氧化时间和电压对钛合金粘接强度的影响。结果表明:电压10V时,CAA方法处理10~15min、SHA方法处理15~20min的钛合金均能获得很高粘接强度;氧化膜层太薄与太厚均不利于提高钛合金/钛合金胶接剪切强度。 相似文献
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本文分析了钛合金材料性能造成的攻丝困难,提出了丝锥结构设计以降低攻丝摩擦扭矩为主;根据试验结果,提出了丝锥各个部位结构形状和尺寸的选择依据,所设计的攻钛合金专用丝锥解决了钛合金可攻性难题.并与振动攻丝工艺相结合,使丝锥的耐用度和攻丝的可靠性大大提高. 相似文献
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航天产品中的一些弹性材料如铍青铜,3J_1、3J_(21),沉淀硬化不锈钢PH17—4,钛合金TC_4,高温合金GH169等等,要求热处理后零件表面高度光亮,不充许氧化。为满足这些技术要求,我们制造了一台真空热处理炉,通过十多年的生产实践,证实这种结构的真空热处理炉有许多优点。 相似文献
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Xin CUI Changhe LI Yanbin ZHANG Wenfeng DING Qinglong AN Bo LIU Hao Nan LI Zafar SAID Shubham SHARMA Runze LI Sujan DEBNATH 《Frontiers of Mechanical Engineering》2023,18(1):3
The substitution of biolubricant for mineral cutting fluids in aerospace material grinding is an inevitable development direction, under the requirements of the worldwide carbon emission strategy. However, serious tool wear and workpiece damage in difficult-to-machine material grinding challenges the availability of using biolubricants via minimum quantity lubrication. The primary cause for this condition is the unknown and complex influencing mechanisms of the biolubricant physicochemical properties on grindability. In this review, a comparative assessment of grindability is performed using titanium alloy, nickel-based alloy, and high-strength steel. Firstly, this work considers the physicochemical properties as the main factors, and the antifriction and heat dissipation behaviours of biolubricant in a high temperature and pressure interface are comprehensively analysed. Secondly, the comparative assessment of force, temperature, wheel wear and workpiece surface for titanium alloy, nickel-based alloy, and high-strength steel confirms that biolubricant is a potential replacement of traditional cutting fluids because of its improved lubrication and cooling performance. High-viscosity biolubricant and nano-enhancers with high thermal conductivity are recommended for titanium alloy to solve the burn puzzle of the workpiece. Biolubricant with high viscosity and high fatty acid saturation characteristics should be used to overcome the bottleneck of wheel wear and nickel-based alloy surface burn. The nano-enhancers with high hardness and spherical characteristics are better choices. Furthermore, a different option is available for high-strength steel grinding, which needs low-viscosity biolubricant to address the debris breaking difficulty and wheel clogging. Finally, the current challenges and potential methods are proposed to promote the application of biolubricant. 相似文献
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针对国内某大型硬质合金企业的DMK-240真空脱蜡烧结一体炉控制系统研发项目,设计出了一种基于PLC和工控机构成的控制系统。该控制系统以温度为主要控制参数,采用基于模糊小脑模型神经网络(FCMAC)与PID控制算法相结合的复合温度控制器对温度进行控制。实际运行结果表明,控制方案控制精度高,动态特性好,满足现代硬质合金生产工艺要求。 相似文献
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