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由于航天科学的高速发展,对材料的要求也越来越高。为了满足某些特殊要求,用高强度、耐高温、耐腐蚀的钛合金来代替铝合金。同时对钛合金的铆接工艺和铆钉材料也提出了相应要求。为此,我们对钛合金铆钉的铆接工艺进行了探索。钛材的屈强比σ_s/σ_b非常接近,手工铆接很难控制压力。当压力低于屈服限σ_8时,铆钉不会成形,而压力稍高时,又会因超过强度限σ_b而产生裂纹(钛合金的应力——应变曲线见图1)。所以用常规压缩空气驱动的气铆,铆接的合格率极低。有的单位为了避
Due to the rapid development of space science, the material requirements are also getting higher and higher. In order to meet certain special requirements, with high strength, high temperature, corrosion-resistant titanium alloy instead of aluminum. At the same time, the riveting technology of titanium alloy and rivet material also put forward corresponding requirements. For this reason, we have explored the riveting process of titanium alloy rivets. The yield strength of titanium is very close to σ_s / σ_b. It is difficult to control the pressure by manual riveting. When the pressure is lower than the yield limit σ_8, the rivet will not form, and the pressure is slightly higher, it will exceed the strength limit σ_b crack (titanium alloy stress-strain curve shown in Figure 1). So with conventional compressed air-driven gas riveting, riveting pass rate is very low. Some units to avoid