自动炮击针表面性能提升技术研究

Research on surface performance improvement technology of automatic shelling needle

火炮在射击过程中击针受严重冲击振动及高温火药气体的冲刷,其在交变应力下产生表面疲劳裂纹,击针失效导致的火炮关键件寿命降低对火炮系统的整体性能影响重要。由于击针失效一般从表面开始,为改善其表面性能,研究了超声复合强化处理提高其表面综合性能。通过表面粗糙度、表面硬度和防腐性比较了传统加工和超声复合强化工艺。结果表明:超声复合强化处理的样件表面粗糙度为0.31μm,表面硬度相比传统加工工艺提高20%,击针寿命比传统车削工艺提高了约62%。材料表面的硬度和耐磨性能通过超声复合强化改善,性能大幅改善,使用寿命提高。

During the firing process of the artillery,the firing pin components are subjected to severe shock and vibration and the scouring of high-temperature gunpowder gas,resulting in the generation and expansion of surface fatigue cracks under alternating stress.The overall performance of the system has a significant impact.Since the failure of the firing pin generally starts from the surface,in order to improve the surface properties of the firing pin,the ultrasonic composite strengthening treatment method was studied to improve the comprehensive surface properties of the firing pin material.The traditional processing technology and the ultrasonic composite strengthening technology were compared from surface roughness,surface hardness and corrosion resistance.The results show that the surface roughness of the modified sample after ultrasonic composite strengthening is 0.31μm,and the surface hardness is higher than the hardness of the traditional machining process by 20%.The life of the firing pin is increased by about 62%compared with the original traditional cutting.The ultrasonic composite strengthening technology increases the hardness and wear resistance of the material surface,further greatly improves the surface properties of the material,and increases the service life of the material.