本文關(guān)鍵詞：固定自耗電極充填法熔鑄的數(shù)值模擬　出處：《遼寧工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 固定自耗電極充填法 電渣熔鑄 溫度場(chǎng) 數(shù)值模擬 熔渣水平長(zhǎng)度 熔池間距

【摘要】：電渣熔鑄以精煉和凝固雙優(yōu)特長(zhǎng),成為高品質(zhì)鑄件的重要生產(chǎn)方法。受到公共型腔限制,到目前為止用電渣熔鑄法鑄造形狀復(fù)雜鑄件仍無(wú)突破性進(jìn)展。為此,提出了固定自耗電極充填法熔鑄形狀復(fù)雜鑄件的新方法。固定自耗電極充填工藝在實(shí)施之前急需解決以下問(wèn)題:(1)固態(tài)渣啟動(dòng)電渣爐時(shí),如果移動(dòng)自耗電極所化熔渣不能與固定自耗電極接觸,則鑄件的熔鑄過(guò)程就無(wú)法正常啟動(dòng),故必須弄清移動(dòng)自耗電極所化熔渣的水平長(zhǎng)度;(2)熔鑄過(guò)程中移動(dòng)自耗電極與固定自耗電極雙重熔化條件下兩個(gè)金屬熔池能否互通。針對(duì)上述問(wèn)題,首先推導(dǎo)出一個(gè)符合固定自耗電極充填法熔鑄過(guò)程的數(shù)學(xué)模型、建立起相應(yīng)的偏微分方程和恰當(dāng)?shù)倪吔鐥l件,并編寫程序,計(jì)算了熔鑄初期固定自耗電極下端斜度不同的熔鑄系統(tǒng)的溫度場(chǎng),并通過(guò)實(shí)驗(yàn)驗(yàn)證了溫度場(chǎng)數(shù)值模擬的準(zhǔn)確性。在此基礎(chǔ)上,計(jì)算了不同工藝參數(shù)下固定自耗電極充填法熔鑄初期化渣過(guò)程熔渣水平長(zhǎng)度、熔鑄達(dá)到穩(wěn)定階段時(shí)的熔池間距。結(jié)果表明,鑄錠底部形狀數(shù)值模擬結(jié)果與實(shí)驗(yàn)結(jié)果基本吻合。通過(guò)數(shù)值模擬發(fā)現(xiàn),初期化渣過(guò)程中熔渣水平長(zhǎng)度的有效距離和底水箱表面的水平長(zhǎng)度隨著電流密度、電極寬度和電極厚度增加而增加且電極寬度有一個(gè)最大值,電極的橫截面形狀越細(xì)長(zhǎng)熔渣的水平長(zhǎng)度越短。熔鑄達(dá)到穩(wěn)定階段時(shí)隨著電流密度的增大,熔池間距減小,當(dāng)電流密度足夠大時(shí)兩金屬熔池互通;隨著電極寬度的增加,熔池間距減小,并且電極寬度增加是有一定限度的;隨著電極厚度的增加,熔池間距逐漸減小;隨著電極間距的增加,熔池間距變大;電極的橫截面形狀越細(xì)長(zhǎng),熔池間距越大,越不利于兩金屬熔池互通。
[Abstract]:Electroslag melting casting has become an important production method for high quality castings by refining and solidifying, which is limited by common cavity. So far, there has been no breakthrough in electroslag casting with complex shape castings. In this paper, a new method of fixed consumable electrode filling is put forward, which is urgent to solve the following problems before the implementation of the fixed consumable electrode filling process, when the solid slag starts up the electroslag furnace, it is urgent to solve the following problems before the implementation of the fixed consumable electrode filling process. If the slag can not contact with the fixed electrode, the casting process will not start normally, so the horizontal length of the slag should be made clear. 2) whether the two metal melting pools can interoperate under the condition of double melting of the moving consumable electrode and the fixed consumable electrode in the process of melting and casting. At first, a mathematical model of the melting and casting process in accordance with the fixed consumable electrode filling method is derived, and the corresponding partial differential equation and appropriate boundary conditions are established, and the program is written. The temperature field of the molten casting system with different slope at the lower end of the fixed consumable electrode in the initial stage of melting and casting is calculated, and the accuracy of the numerical simulation of the temperature field is verified by experiments. The horizontal length of slag in the initial slagging process of fixed consumable electrode filling method was calculated under different process parameters, and the melting pool spacing was calculated when the melting process reached the stable stage. The numerical simulation results of the bottom shape of the ingot are in good agreement with the experimental results. It is found that the effective distance of the slag horizontal length in the initial slagging process and the horizontal length of the bottom water tank surface with the current density. With the increase of electrode width and electrode thickness, the electrode width has a maximum value, the smaller the electrode cross section shape is, the shorter the horizontal length of slag is. When the melting casting reaches the stable stage, the current density increases. When the current density is large enough, the two metal melting pools interoperate; With the increase of electrode width, the distance between the melting pool decreases and the electrode width increases to a certain extent. With the increase of electrode thickness, the melting pool spacing decreases gradually. With the increase of electrode spacing, the melting pool spacing becomes larger. The longer the cross section of the electrode is, the greater the weld pool spacing is, which is not conducive to the interworking of the two metal melting pools.
【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TF14;TG24

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