(大連理工大學(xué)鑄造工程研究中心，大連116023)
摘 要: 將實(shí)驗(yàn)得到的初始凝固坯殼的形狀與數(shù)值模擬結(jié)果相結(jié)合的反推法確定了內(nèi)結(jié)晶器冷卻水量與內(nèi)結(jié)晶器側(cè)壁換熱系數(shù)之間的關(guān)系，模擬了冷卻水流量為80、100、120 L/s時(shí)凝固坯殼的形狀和位置；在模擬得到的固-液界面位置附近，即距液面5~20 mm處施加了頻率為2 500 Hz的電磁場(chǎng)。結(jié)果表明：與傳統(tǒng)連鑄方法相比，施加電磁場(chǎng)后空心管坯的質(zhì)量得到了明顯的改善。
關(guān)鍵字: 電磁連續(xù)鑄造；空心管坯；熱交換系數(shù)
of hollow billets
（ Engineering Research Center of Foundry,
Dalian University of Technology, Dalian 116023, China）
Abstract: The relationship between the cooling water flow rate and the heat transfer coefficient at the billet/core interface was built up via the trial-and-error approach. The position and shape of the initial solidified shell were predicted by the numerical simulation when the cooling water flow rate is 80,100 and 120 L/s. The electromagnetic field with the frequency of 2 500 Hz was imposed to the position of liquid/solid interface which was 5-20 mm close to the liquid level. The results show that comparing with the conventional continuous cast one, the electromagnetic cast has obviously improved billet quality.
Key words: electromagnetic continuous casting; hollow billet; heat transfer coefficient
