Based on the design of the multi-row sprocket with a new tooth profile, a cold semi-precision forging process for manufacturing 5052 aluminum alloy multi-row sprocket was presented. Through simulating the forging process of 5052 aluminum alloy sprocket billet with 3D rigid-viscoplastic FEM, both the distributions of flow velocity field in axial (UZ), radial (UR) and circumferential (Uθ) directions and the curves of velocity component in different deformation regions were respectively obtained. By comparison and analysis of the velocity varying curves, the velocity component relation conditions for filling the die cavity were clarified. It shows that when the die cavity is almost fully filled, the circumferential velocityUθ increases sharply, implying thatUθ plays a key role in fully filling the die cavity.%基于多排链轮新的齿形设计，提出5052铝合金多排链轮冷半精锻成形的新工艺。采用三维刚粘塑性有限元方法对5052铝合金多排链轮锻造过程进行数值模拟，分别得到其轴向UZ、径向UR和切向Uθ的流动速度分布图和坯料流体在不同变形区的速度分量曲线。通过对比分析坯料速度分量曲线的变化，得到坯料流体填充凹模型腔的速度分量关系条件。在坯料流体填充凹模型腔的过程中，发现切向速度Uθ在成形过程中陡增，表明Uθ是决定坯料流体能否充满凹模型腔的关键因素。
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