纤维绕针弯曲阶段穿刺钢针针尖形态优化

Optimizing of puncture steely needlepoint morphology during the stage of fiber bending and elongation needles

针对整体穿刺过程中纤维绕针弯曲阶段,穿刺钢针在纱线张力作用下处于压缩与弯曲的组合变形、钢针针尖在该张力的作用下产生位移,该位移导致钢针针尖与穿刺模板孔壁接触致使针尖被下行的穿刺模板破坏甚至出现整体穿刺工作不能进行的问题,建立穿刺钢针在纤维的绕针弯曲阶段的力学模型,根据该模型建立钢针针尖曲线及穿刺钢针结构尺寸、材料弹性模量等参数的函数关系,利用Matlab对选定的穿刺系统穿刺钢针针尖曲线次数进行了算例计算。通过算例在给定的参数下求解出针尖曲线为二次最为合理,验证了理论的合理性和可行性,为穿刺钢针在满足强度要求且不与穿刺模板孔壁接触条件下针尖曲线的设计提供理论依据。

Due to the effect of yarn tension on the puncture of the fiber during needle bending,the puncture needle has combination deformation of compressional and bending;The displacement causes the needle tip to contact with the wall of the puncture template,leading to the destruction of needle tip because of the decline of puncture template,even the problem that the overall puncturing work cannot be performed.The mechanical model of the puncture needle during the bending phase of the fiber around the needle is established,and the functional relation about the parameters of the needle tip curve,the puncture needle structure size and the material elastic modulus are established according to this model.The example about the degree of needle tip curve of the selected puncture system is calculated by Matlab,and gets the most reasonable results when the needle tip curve is a conic curve.The example verifys the rationality and feasibility of the theory,and provides the theoretical basis for the design of needle tip curve which satisfies the strength requirements and does not contact the hole wall of the puncture template.