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工程设计学报
Chinese Journal of Engineering Design  2010, Vol. 17 Issue (5): 329-333    DOI:
    
Design of combined cathode and optimization for tooth profile
 SHEN  Jian-Qiang, FAN  Zhi-Jian
School of Mechatronic Engineering, Xi‘an Technological University， Xi’an 710032， China
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Abstract   To solve the problem of the traditional cathode with fixed tooth in processing mixed rifling， the design to divide work part of the cathode into 10 wheel plates was presented. Each wheel plate meshing with the gear possessing different modulus and number of teeth of gear， was driven by the micromotor inserting in the cathode body and rotate at various angles so that the cathode working tooth can be consistent with the direction of rifling angle separately. However， the separation， cavitations， and eddy current appeared near the ladder-shaped surface on each working tooth frequently. Four schemes to optimize tooth shape were designed， the time-averaged drag coefficient and ablation volume was calculated by programming. The results show that the relative error of the ablation volume by the fourth scheme is the smallest compared with the theoretical， the time-averaged drag coefficient reduces 70% compared with the non-modification. Finally， the shape parameter s=0.5 mm of the riblet structure on the working tooth was adopted for further optimization and the drag-reduction achieved 14.6%．

Key words： mixture rifle      combined cathode      riblet structure      drag-reduction     
Published: 28 October 2010
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SHEN Jian-Qiang
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SHEN Jian-Qiang, FAN Zhi-Jian. Design of combined cathode and optimization for tooth profile. Chinese Journal of Engineering Design, 2010, 17(5): 329-333.

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https://www.zjujournals.com/gcsjxb/     OR     https://www.zjujournals.com/gcsjxb/Y2010/V17/I5/329


组合式阴极的设计及其齿形优化

针对传统的固定工作齿式阴极在加工混合膛线时的不足，提出将阴极工作部分分成10片轮齿，分别与不同模数和齿数的齿轮内啮合，受嵌阴极体内微电机的驱动， 旋转不同的角度，使阴极每条工作齿与膛线缠角方向始终保持一致．针对每条工作齿的阶梯状表面容易出现分离、空穴和涡流的问题，采用4种方案对轮齿齿牙的形状进行修形和优化，计算其蚀除量、时均阻力系数.结果表明，按方案4计算出的蚀除量与理论蚀除量相比，相对误差最小，时均阻力系数与未修形时相比减小了64.5%．最后提出采用形状参数s=0.5 mm的脊状结构对阴极工作齿进一步优化，取得了14.6%的减阻效果．

关键词： 混合膛线,  组合式阴极,  脊状结构,  减阻 
[1] ZHANG Xiao-jun,TANG Lin,WANG Hang-yu,LI Chun-ling. Application of UG secondary development technology in ECM of rifle of artillery tube[J]. Chinese Journal of Engineering Design, 2008, 15(4): 259-262.