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铆接东方红—54/75拖拉机车架φ19厘米的铆钉时,所需的最大铆接作用力为23吨(广东省东莞市农机修造厂曾做过实验並得出该结论)。根据我们的调查,黑龙江垦区各修理单位所用液压铆枪的铆接作用力不足23吨,因而铆接质量不佳,多数车架铆接修复后仅能用1~2年就需重新铆接。其原因之一是由于车架受力较复杂,引起大梁变形后,使铆接件不能严密贴合;另一原因是铆钉孔多数是椭圆的,铆接作用力不足以使铆钉变形充满全孔。因此,在重新铆接时,
Rivet Dongfanghong -54 / 75 tractor frame φ19 cm rivets, the maximum required riveting force of 23 tons (Guangdong Province, Dongguan City Agricultural Machinery Factory had done experiments and reached the conclusion). According to our investigation, the hydraulic riveting rifle used by the repair units in Heilongjiang Reclamation Area has less than 23 tons of riveting force, so the riveting quality is poor. Most riveting fixtures can only be re-riveted after 1 to 2 years. One of the reasons is that the frame is subject to more complicated forces and causes the beam to deform so that the rivets can not fit closely. The other reason is that the rivet holes are mostly oval, and the riveting force is not sufficient to make the rivet deformed to fill the entire hole. Therefore, when re-riveting,