共查询到19条相似文献,搜索用时 125 毫秒
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在机械加工过程中,数控车床加工复杂工件经常碰到,而在加工前对该工件的装夹定位,保证加工精度等,这些问题就成了这类零件加工的难题。本文通过对悠悠球零件端面加工时的装夹进行了分析,并制作出一套专用夹具;该夹具具有结构简单,操作灵活,定位准确等优点。通过实际加工验证后,既提高了加工的效率、产品的尺寸精度,同时也创造了良好的经济效益。 相似文献
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本文主要介绍飞机玩具型芯镶件在数铣加工过程中,夹具的巧妙运用,详细地讲述了飞机橡胶模具结构,夹具和镶件的加工,镶件在夹具上的装夹。实践证明,通过这种加工方法取得了很好的经济效益,为零件的多面加工提供一个很好的加工思路。 相似文献
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廖小吉 《工业技术与职业教育》2020,18(1):13-15
基于智能制造理念,借助三维设计软件完成机器人快换夹具结构设计,并基于机器人编程语言实现机器人端夹具的自动快换。机器人快换夹具结构包含快换夹具工作台和机器人端快换夹持系统两部分。快换夹持系统由1套机器人侧快换装置和3套工具侧快换手爪组成,基于机器人编程语言,实现3种机器人手爪的快速更换。搭建的软硬件系统可作为智能制造平台系统的重要组成单元,对于智能制造系统的应用研究起到一定的理论推进作用。 相似文献
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用配合滴定法和原子吸收法测定钢帘线镀层中铜的含量.钢帘线镀铜的目的是为了改善钢丝与橡胶之间的粘合性能,镀铜量的多与少对粘合性能都有影响.这两种方法都是国标法,都可满足工厂实际生产需求,滴定法对操作环境及仪器要求低、成本低;原子吸法的准确度和精密度较高、选择性极好、测定范围广. 相似文献
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A design is presented for a fixture to test concentric-ring loaded disks and four-point loaded plates at high temperatures. In this fixture the loading plunger is guided by flexure plates to determine the load path with accuracy. The uniaxial and equibiaxial tensile strengths of a brittle material were measured at 982°C with this fixture. For lapped surfaces, the equibiaxial tensile strength of dense, isostatically pressed, sintered alumina was 16.0% lower than the uniaxial tensile strength. The uniaxial strength at 982°C was 42.3% lower than the previously reported value for comparable tests at room temperature. The effect of frictional forces and lateral constraint, of specimen and loading geometry, and of local stresses on the nominal stress are discussed. 相似文献
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铜矿渣应用于水泥与混凝土中可降低炼铜企业成本,又有利于环境保护.介绍了铜矿渣的物理与化学性质,对铜矿渣在水泥和混凝土领域的研究进展进行了综述.铜矿渣可作为铁质原料配置生料,配置的生料易烧性好,并能改善熟料的岩相结构和力学性能;也可作为水泥熟料混合材,所制成的水泥具有早期水化放热低、后期强度发展高等优点.铜矿渣可作为细骨料应用于混凝土中,铜矿渣混凝土具有与普通混凝土相当的工作性、力学性能与耐久性能.铜矿渣和水泥熟料有相似的化学成分,可通过物理或化学方式激发铜矿渣的活性作为胶凝材料应用于混凝土中,与Ca(OH)2反应生成与水泥水化相似的水化产物.铜矿渣可降低混凝土的脆性系数,具有减脆的作用. 相似文献
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论述铜精矿试样用硫磷混酸分解,硫酸亚钛还原,重铬酸钾滴定法滴定,能较快速度得到铜精矿中铁的含量。并研究了方法的准确度和精密度,同时对共存杂质作了研究。方法的准确度和精密度都能达到分析要求,适用于铜精矿中含铁0.5%以上含量的测定。 相似文献
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在紫铜表面制备了功能性化学镀锡层。用扫描电镜观察了化学镀锡层的表面形貌,用X射线衍射仪分析了化学镀锡层的物相,并用电化学工作站对化学镀锡层的耐蚀性进行了测试。结果表明:化学镀锡层表面比较致密,呈不规则的柱状结构;化学镀锡层的XRD图谱中出现了六个明显的锡衍射峰;化学镀锡层能为紫铜提供有效的保护,提高紫铜在质量分数为3.5%的氯化钠溶液中的耐蚀性。 相似文献
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Philip Klemarczyk 《The Journal of Adhesion》1999,69(3):293-306
Alkyl cyanoacrylate instant adhesives are widely used because of their fast cure speed and versatility on a large number of substrates. Recent performance improvements, such as increased thermal resistance, resulted from the addition of latent acids and polymers, which do not copolymerize with the adhesive monomer, to the adhesive formulations. However, use of these additives can increase fixture time or reduce the final adhesive strength.
Two methods for possibly improving alkyl cyanoacrylate instant adhesives, without loss of cure speed or adhesive properties, could be either crosslinking the alkyl cyanoacrylate monomer with a dicyanoacrylate or copolymerizing it with a second 1, 1 disubstituted electron-deficient olefin. A crosslinker. 1,4 butanediol dicyanoacrylate (BDDCA) and two monofunctional monomers, diethyl methylenemalonate (DEMM) and N,N diethyl-2-cyanoacrylamide (DECA), were prepared, in good purity, for adhesion studies with ethyl cyanoacrylate (ECA). Crosslinking ECA with BDDCA does improve solvent resistance, as determined by solvent swelling experiments. Glass fixture times are approximately the same for ECA, crosslinked ECA, the pure monomers, and monomer mixtures with ECA, while steel fixture times are generally slower. Crosslinking ECA with BDDCA does not improve lap-shear adhesion, either at room temperature or after thermal exposure at 121°C. Lap-shear strength data, before and after heat exposure, revealed that the ECA/DEMM and the ECA/DECA monomer mixtures exhibit weaker lap-shear adhesive strength than ECA alone. 相似文献
Two methods for possibly improving alkyl cyanoacrylate instant adhesives, without loss of cure speed or adhesive properties, could be either crosslinking the alkyl cyanoacrylate monomer with a dicyanoacrylate or copolymerizing it with a second 1, 1 disubstituted electron-deficient olefin. A crosslinker. 1,4 butanediol dicyanoacrylate (BDDCA) and two monofunctional monomers, diethyl methylenemalonate (DEMM) and N,N diethyl-2-cyanoacrylamide (DECA), were prepared, in good purity, for adhesion studies with ethyl cyanoacrylate (ECA). Crosslinking ECA with BDDCA does improve solvent resistance, as determined by solvent swelling experiments. Glass fixture times are approximately the same for ECA, crosslinked ECA, the pure monomers, and monomer mixtures with ECA, while steel fixture times are generally slower. Crosslinking ECA with BDDCA does not improve lap-shear adhesion, either at room temperature or after thermal exposure at 121°C. Lap-shear strength data, before and after heat exposure, revealed that the ECA/DEMM and the ECA/DECA monomer mixtures exhibit weaker lap-shear adhesive strength than ECA alone. 相似文献