锻压技术

ZA27合金蜗轮毛坯半固态模锻成形研究

英文标题：Research on semi-solid forging of ZA27 alloy worm wheel blanks

作者：崔联合

单位：江阴职业技术学院

分类号：TG249.2;TG315.2

出版年,卷(期):页码：2011,36(6):51-54

摘要：

对ZA27蜗轮毛坯进行半固态成形试验，在不同比压和模具温度条件下，对制件的宏观成形性和微观组织形貌进行了分析研究。结果发现：比压较小时，齿型无法成形，当比压为40~60MPa时，蜗轮成形性良好；当压力过高时，易形成纵向飞刺且脱模困难。随着压力的上升，制件微观组织发生明显的变化，球状及玫瑰状的半固态组织逐步发生断裂、变形及以龟斑状形貌排列的现象。当模具温度较低时，半固态浆料在模具中充型困难；当模温在200℃时，成形良好；在不同模温下，蜗轮齿顶的微观组织形貌差异较大，从玫瑰状转变为碎片状微观组织。

The research on microstructure pattern and macroscopic formability of the ZA27 alloy worm wheel blanks by semi-solid forging experiment under different specific pressures and mold temperatures was stated. The results show that under less specific pressure, the worm wheel can not be formed, while the specific pressure is 4060MPa,its formability is good, and when the specific pressure is too high, it is easy to form the flash and it is hard to demould.With the increasing of the specific pressure, the microstructure of the parts changes obviously, and the spherical and rose-shaped semi-solid microstructure will break and deform as well as arrange in tortoise porphyritic. When the mold temperature is lower, the semi-solid slurry is difficult to fill the mould, and when the mold temperature is 200℃,its formability is well. Under different mold temperatures, there is a great difference in the microstructure of addendum of the worm wheel, it changes from the rose-shaped semi-solid microstructure to the broken microstructure.

基金项目：

参考文献：

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