谷忠明2， 范 增2， 李德全2， 吳 均2
(1. 重慶大學(xué) 機(jī)械工程學(xué)院， 重慶 400044；
2. 中國嘉陵集團(tuán)重慶九方鑄造有限責(zé)任公司， 重慶 400032)
摘 要: 采用高頻感應(yīng)加熱裝置和溫度測定裝置, 研究了ZL112Y壓鑄鋁合金坯料高頻感應(yīng)加熱二次重熔合適的半固態(tài)重熔溫度、 加熱功率和速度， 以及這些工藝參數(shù)對坯料的觸變性能和微觀組織的影響。結(jié)果表明： 該合金合理的半固態(tài)二次重熔溫度為570～571℃； 在優(yōu)化的感應(yīng)加熱工藝條件下， 半固態(tài)重熔坯料內(nèi)部的溫差在0～1℃； 半固態(tài)重熔過程使原始料坯中的α枝晶組織變成球團(tuán)狀和節(jié)桿狀組織， 滿足了半固態(tài)觸變成型的要求。 采用實驗室所獲得的二次重熔工藝成功地壓鑄成形了JH70型摩托車發(fā)電機(jī)支架零件。
關(guān)鍵字: 半固態(tài)； 鋁硅合金； 二次重熔工藝； 半固態(tài)成形
GU Zhong-ming2, FAN Zeng2, LI De-quan2, WU Jun2
（1. College of Mechanical Engineering,
Chongqing University, Chongqing 400044, China;
2. Chongqing Jiufang Industry Ltd. Co.,
Chongqing Jialing Industry Company,Chongqing 400032, China）
Abstract:Using a high-frequency induction heating equipment and a device for temperature measuring, the reasonable semi-solid processing parameters, including semi-solid remelting temperature, heating power and speed, in the process of high-frequency reheating, and the effects of these parameters on thixotropic behaviors of billets and microstructures of the alloy were investigated. The results show that: 1) the proper semi-solid remelting temperature of the alloy is in the range of 570～571℃; 2) in the condition of optimal reheating processing, the temperature deviation in a billet is 0～1℃; 3) dendritical colonies of α phase in original billet change into isolated grains with forms of nodules and granule, which may satisfy the need of semi-solid thixoforming forming in theory. Further more, a component used in JH70 motors was formed in practice in semi-solid die casting processing by using the optimal semi-solid processing parameters obtained in laboratory.
Key words: semi-solid; Al-Si alloy; remelting processing; semi-solid forming
