目的 对一种新型锂电气动射钉器的撞针机构在打钉过程中的冲击特性进行研究,为撞针机构的进一步优化提供参考。方法 建立基于显式动力学的撞针机构打钉过程仿真模型,并通过射钉穿透长度实验验证打钉过程仿真模型的可靠性,通过仿真对打钉过程中撞针与活塞的时间-应力历程进行研究。结果 仿真与试验穿透长度的误差为3.01%,得到仿真模型可靠性较好。在射钉即将穿透靶板的时刻,撞针与活塞的应力最大,撞针的最大应力为854.9 MPa,撞针材料60Si2Mn屈服强度为1 375 MPa,撞针最大应力小于其材料屈服强度,满足强度要求;活塞的最大应力为88.272 MPa,活塞材料7050-T7451屈服强度为470 MPa,活塞应力小于其材料屈服强度,满足强度要求。结论 撞针的最大应力区位于撞针后齿,撞针后齿承受了最大的冲击载荷,应在设计、制造中对后齿进行适当强化处理。
Abstract
The work aims to investigate the impact characteristics of a striker mechanism in a lithium pneumatic nailer during nailing, to provide a reference for further optimization of the striker mechanism. A simulation model of the nailing process was established based on explicit dynamics, and its reliability was verified through nail length of penetration experiments. The time-stress history of the striker mechanism and the piston during the nailing process was analyzed via simulation. The error between the simulated and the experimental penetration length was 3.01%, demonstrating good reliability of the simulation model. It was found that the stress of the striker mechanism and the piston was the greatest when the nail was about to penetrate the target plate. The maximum stress of the striker mechanism was 854.9 MPa, which was below the yield strength (1 375 MPa) of its material (60Si2Mn), meeting the strength requirement. The piston's stress was 88.272 MPa, also below the yield strength (470 MPa) of its material (7050-T7451), satisfying the strength requirement. In conclusion, the maximum stress concentration of the striker mechanism occurs at its rear tooth region, which undergoes the most significant impact loading during operation. To ensure structural integrity and service life, targeted reinforcement of the rear tooth should be implemented in both the design and manufacturing.
关键词
射钉器 /
撞针机构 /
穿透长度 /
应力 /
冲击特性
Key words
nailer /
striker mechanism /
length of penetration /
stress /
impact characteristics
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基金
四川省科技计划重点研发项目（2021YFG0343）
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