热气胀成型工艺

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A柱埋管内嵌防滚架 热气胀工艺是什么?
Zhong Guo Zhi Liang Xin Wen Wang· 2025-05-28 07:06
Core Viewpoint - The article discusses the advancements in automotive manufacturing technology, particularly focusing on Xiaomi's YU7 model and its innovative "hot gas expansion process" that enhances vehicle safety and performance while reducing production costs [1][3]. Group 1: Hot Gas Expansion Process - The Xiaomi YU7 utilizes a hot gas expansion process to embed 2200MPa ultra-strong steel into the A and B pillars, resulting in a 35% increase in A pillar load-bearing capacity and a 70.5% increase in B pillar load-bearing capacity [3][5]. - This process is inspired by roll cages and integrates with the vehicle's structure to form an "embedded roll cage," enhancing occupant protection [3][12]. Group 2: Advantages of Hot Gas Expansion - Hot gas expansion is a metal processing technique that uses high-temperature gas to pressurize and shape tubular materials, allowing for the creation of complex closed-section parts [5][10]. - Compared to traditional high-strength steel plates, hot-formed components can significantly reduce vehicle weight while providing higher strength, exemplified by a reduction from 10kg to 5kg for A pillars while increasing strength from 500MPa to 1400MPa [8][10]. Group 3: Industry Trends - The automotive industry is increasingly focusing on lightweight design, with data indicating that a 10% reduction in vehicle weight can improve fuel efficiency by 6%-8% [12][16]. - The use of closed-section tubular structures in automotive design is gaining traction, similar to applications in aerospace, to enhance overall stiffness, strength, and safety [14][16].