K-9 자주포 카운터 어셈블리 기어 모듈의 생산성 향상을 위한 PEEK 소재 적용 및 사출 성형 공정 연구

초록

To overcome the inefficiencies and limitations in mass production associated with conventional metal-machining processes for the counter-assembly gear module of the K-9 self-propelled howitzer, this study applied high-performance engineering plastic polyether ether ketone (PEEK) and optimized a new manufacturing system based on injection molding. A four-step iterative development process was employed: (1) CAD(Computer Aided Design)-based redesign of the gear module to satisfy the microhole pattern precision required for the electronic counter-assembly system, (2) mold design and fabrication, (3) optimization of the injection-molding process, and (4) performance and reliability evaluation of the fabricated prototype. Experimental results show that, compared with the conventional SUS304 machining process, the proposed process reduced the production time and manufacturing cost by approximately 1 h, and the 1.5 million KRW, respectively. The injection-molded prototype demonstrated equivalent or superior performance in terms of dimensional accuracy (run-out: 28 m), a uniform hole pattern, and dimensional accuracy. μ Furthermore, under repeated rotational conditions, the prototype exhibited stable operational behavior with no significant changes in noise, vibration, or wear, thereby ensuring smooth and reliable gear performance. This study experimentally verified the suitability of PEEK as a material used in high-precision components for defense applications, such as gear modules, as demonstrated by its excellent mechanical precision, operational stability, and wear resistance. In particular, the application of injection molding offer clear advantages over conventional metal-machining methods in terms of productivity and cost efficiency.

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