本文選題：鑲鑄法 + 軋輥��； 參考：《昆明理工大學》2017年碩士論文

【摘要】：軋輥在耐磨行業(yè)中的運用比較廣泛,相對于單一材料的軋輥,雙金屬復合軋輥的耐磨性能更好,使用壽命更長。以前,研究人員對軋輥的研究主要集中在單一材料上,或者是對雙金屬復合軋輥的凝固過程進行實驗研究,運用數(shù)值模擬方法對雙金屬復合軋輥凝固過程進行理論研究的較少。本文運用ANSYS有限元軟件對鑲鑄法制備雙金屬復合耐磨軋輥的凝固過程進行了數(shù)值模擬,主要包括凝固過程溫度場的模擬和凝固過程應力場的模擬。本文研究了在三種不同的澆注溫度下(1300℃、1400℃、1500℃),雙金屬復合耐磨軋輥凝固過程的溫度場和熱應力場,通過對模擬的結(jié)果分析表明,澆注溫度越高,凝固的速度越緩慢,熱應力也越大,也越容易出現(xiàn)縮孔縮松等缺陷;澆注溫度偏低,凝固速度快,也會導致鑄件凝固過程不均勻等問題。所以在鑄件實際的澆注過程中選取澆注溫度為1400℃,可以有效地防止縮孔的產(chǎn)生。同時研究了三種不同形狀的輥芯對雙金屬復合耐磨軋輥凝固過程的溫度場和應力場的影響,通過對模擬的結(jié)果分析表明,在凝固初期,輥芯形狀對鑄件凝固過程的溫度場分布影響較小;在凝固中期,長方體輥芯的鑄件的凝固速度最快,六棱柱輥芯的鑄件的凝固速度最慢,圓柱體輥芯的鑄件的凝固速度較為適宜。六棱柱輥芯的鑄件受到的熱應力大于長方體輥芯的鑄件受到的熱應力,長方體輥芯的鑄件受到的熱應力大于圓柱體輥芯的鑄件受到的熱應力。本文運用Abaqus對凝固過程的溫度場和應力場進行了驗證性模擬,結(jié)果表明Abaqus模擬計算的結(jié)果與ANSYS計算的結(jié)果一致,從仿真模擬的角度驗證了ANSYS對雙金屬復合耐磨軋輥凝固過程溫度場和應力場模擬的準確性和可靠性。同時對ANSYS模擬之后的參數(shù)進行了優(yōu)化,將優(yōu)化之后的參數(shù)運用到驗證性實驗當中,通過實驗澆注出來的鑄件與ANSYS模擬優(yōu)化之后的結(jié)果比較吻合,從實驗的角度驗證了 ANSYS對雙金屬復合材料進行數(shù)值模擬的準確性和可靠性,說明數(shù)值模擬技術(shù)對實際的鑄造工藝具有一定的指導意義。
[Abstract]:The roll is widely used in the wear-resistant industry. Compared with the single material roll, the bimetallic compound roll has better wear resistance and longer service life. In the past, researchers mainly focused on a single material, or the solidification process of bimetallic composite roll was studied experimentally, but few of them studied the solidification process of bimetallic compound roll by numerical simulation method. In this paper, the numerical simulation of solidification process of bimetallic composite wear resistant roll prepared by inlay casting method is carried out by using ANSYS finite element software, including the simulation of temperature field during solidification process and the simulation of stress field during solidification process. In this paper, the temperature field and thermal stress field of bimetallic composite wear resistant roll during solidification are studied under three different pouring temperatures. The results of simulation show that the higher the pouring temperature, the slower the solidification rate. The larger the thermal stress is, the more easily the defects such as shrinkage and porosity will occur, and the lower pouring temperature and the faster solidification speed will lead to the inhomogeneous solidification process of castings. Therefore, the casting temperature of 1400 鈩，

本文編號：2021211