复合冷挤新形式——并行挤压

对端部相连且带凸台的多杆型零件——一种平面钩型换向器本体在液压机一次行程中同时冷挤压出各个凸台与杆的复合正挤压进行试验研究,实现该类钩型换向器本体的整体冷挤成形;用Super forge软件对其冷挤压的变形过程作了数值仿真。研究结果表明,此种复合挤压过程中,各部分均同时平行存在镦粗—挤压凸台—挤压杆部3个变形阶段,符合正挤压变形规律。基于本研究并结合已有多杯型零件正挤压的实例,提出了复合挤压工艺中的一种新形式——并行挤压的新概念。

复杂盒形等温—冷挤复合成型工艺研究

针对某 LD10铝合金支架生产中存在的材料利用率低、加工成本高及性能难以满足要求等一系列问题,根据铝合金成型要求及该零件外形特点,应用逐次控制变形和等温一冷挤复合成型技术,对其挤压成型工艺进行了研究,并进行了小批量试制。结果表明:所制定的成型工艺合理可行,挤压件的尺寸精度、显微组织和力学性能均符合要求,为同类型不规则或非对称复杂盒形状的成型提供了思路。

锁扣凸台的压凸冷挤复合模设计

针对锁扣凸台强度不足而导致的失效实例,在分析其压凸台模具结构及工作原理的基础上,找出了原压凸成形机理上的缺陷,明确了失效的原因.由此提出了压凸冷挤复合工艺,设计了压凸冷挤复合模,分析了压凸冷挤复合工艺的成形机理.生产实践及强度试验表明:该工艺能满足产品要求,对强度的提高有显著效果.

Casting-cold extrusion of Al/Cu clad composite by copper tubes with different sketch sections

Casting-cold extrusion technology was presented to fabricate alttminum/copper clad composite, and copper tubes with different sketch sections were designed. The technology of aluminum/copper clad composite fabricated by casting-cold extrusion was simulated by DEFORM software using tubes with four arc grooves. The stress and strain in different deformation zones were analyzed. The groove size reduces gradually and the groove shape drives to triangle during the extrusion procedure. The maximum values of equivalent effective stress and radial stress appear in groove zones, and the maximum equivalent effective strain firstly is obtained also in groove zones. The grain size in groove zones is less than that in other zones. The experimental results are consistent with simulation results, which prove that the copper tubes with sketch section are favorable to the metallurgy bond of boundary interface between aluminum and copper.