In the mass production of fasteners, cold heading dies are a core component determining production line stability, product precision, and production costs. High-frequency impact, continuous friction, and alternating hot and cold operating conditions have long been common challenges faced by manufacturing companies. Problems such as die cracking, rapid wear, and precision degradation can easily affect the overall production rhythm and finished product quality. Based on real-world production pain points in the industry, Ningbo Yijun Technology Co., Ltd. (hereinafter referred to as "Yijun Technology") has deeply cultivated the field of precision die R&D and manufacturing, specifically iterating its product system and launching a new generation of high-performance cold heading die series. With solid material processing technology and innovative structural design, it provides a highly adaptable, highly stable, and long-life complete solution for fastener mass production.
For common industry scenarios, Yijun Technology's H13 high-quality alloy main die achieves a balance between practicality and stability. This mold uses high-quality electroslag remelted H13 steel as its core material, combined with a mature vacuum heat treatment process, to stably control its hardness within the reasonable range of HRC 48–52. Leveraging the characteristics of the superior base material and refined heat treatment technology, the mold core exhibits ample toughness and excellent resistance to thermal fatigue. It can easily withstand the high-frequency continuous impact during cold and warm forging processes, effectively delaying mold fatigue aging and avoiding problems such as surface peeling and early cracking that are common in long-term mass production. This significantly reduces the frequency of mold replacements and ensures continuous and stable operation of the production line.
For high-intensity, high-load precision mass production scenarios, the company has significantly upgraded and launched a six-piece split mold using H13+ cemented carbide, achieving a dual breakthrough in mold lifespan and forming accuracy. This innovative mold structure uses a composite material combination, with ultra-fine grain WC-Co cemented carbide as the core, achieving a hardness of HRA 88–91.5, significantly improving wear resistance and compressive strength. The outer layer is fitted with a high-strength H13 alloy prestressed jacket, balancing overall toughness and structural strength. The unique six-piece split structure effectively improves upon the stress concentration drawbacks of traditional integral molds, evenly distributing radial pressure during cold heading and significantly reducing internal friction loss during large material deformation forming.
Verified by multiple batches of mass production testing data, compared to traditional integral cemented carbide molds, Yijun's split mold offers a 150%–300% increase in service life, while maintaining stable dimensional tolerances within ±0.005mm over the long term. While ensuring ultra-high machining accuracy, it effectively reduces downtime for mold repair and replacement, genuinely helping companies reduce costs and increase efficiency, perfectly adapting to the large-scale production needs of high-end fasteners and high-precision standard parts.
Precise adaptation to working conditions is the core key to long-term mold stability. Yijun Technology understands that mold adaptability is not determined by a single material and structure, but requires comprehensive matching of multiple parameters such as production line equipment tonnage, stamping frequency, wire tensile strength, and workpiece material hardness. To this end, Yijun Technology has assembled a professional technical team, leveraging its long-accumulated database of fatigue testing under various working conditions. Based on customers' actual production conditions, product process requirements, and existing mold wear and failure issues, they optimize core parameters such as cemented carbide grain size, cobalt content, and preload stress on a one-to-one basis, customizing exclusive mold solutions to ensure each mold perfectly matches the customer's real-world production scenario.
Deeply rooted in the precision mold industry, Yijun Technology remains committed to its original mission of precision manufacturing. As a leading domestic cold heading mold R&D and manufacturing enterprise, Yijun Technology consistently focuses on the niche market of fastener-related molds, deeply cultivating technology, polishing processes, and optimizing services. The company has established a comprehensive quality control system covering the entire process from raw material selection, precision machining, heat treatment control, accuracy testing, and finished product delivery, strictly controlling every production step. Simultaneously, it continuously cultivates the front-line market, collecting the latest industry working condition requirements and user feedback, continuously iterating products, optimizing structures, and upgrading processes to steadily improve overall product performance.
High-quality development of the manufacturing industry is inseparable from the technological upgrading of basic supporting components. Currently, the domestic fastener industry is accelerating its transformation towards precision, efficiency, and high-end products. Technological innovation in upstream precision molds is a crucial support for the upgrading of the industrial chain. The launch of this new generation of cold heading dies is the culmination of Yijun Technology's years of technological accumulation and a significant step in the company's efforts to upgrade and improve the fastener industry.
In the future, Yijun Technology will continue to address industry pain points, deepen its research and development in precision dies, and continuously refine high-quality, long-life, and highly adaptable die products. Through precision manufacturing, Yijun Technology will empower the coordinated development of the upstream and downstream of the industry chain, contributing to the steady advancement of China's precision manufacturing industry.
