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決定山東鋁合金壓鑄質量的關鍵因素是什么?

刮刮乐2000 www.yfrmbf.com.cn 來源:    發布時間:2019-06-19 15:58:59    點擊:

  鋁合金壓鑄,鋁合金壓鑄廠,鋅合金壓鑄,鋅合金壓鑄廠//www.yfrmbf.com.cn進步鋁合金壓鑄件質量關鍵何在?目前機床鑄件大局部為灰鑄鐵,關于灰鑄鐵件的質量,要從化學成分、原資料質量、配料、合金化、熔煉溫度、孕育處置直至熱時效等環境嚴厲控制。
  What is the key to improving the quality of aluminium alloy die castings in aluminium alloy die casting, aluminium alloy die casting plant, zinc alloy die casting, zinc alloy die casting plant //www.yfrmbf.com.cn? At present, most machine tool castings are gray iron. The quality of gray iron castings should be strictly controlled from chemical composition, raw material quality, ingredients, alloying, melting temperature, inoculation and treatment to thermal aging.
  1、熔煉環節
  1. Melting link
  1)碳當量。應采用較高的碳當量,HT250,以3.95為好;HT300,以3.82為好;HT350,以3.76為好。
  1) Carbon equivalent. High carbon equivalent should be adopted, HT250, 3.95, HT300, 3.82 and HT350, 3.76.
  2)硅碳比。倡議比較好將硅碳比控制在0.55-0.62。
  2) Silicon-carbon ratio. It is advisable to limit the silicon-carbon ratio to 0.55-0.62.
  3)合金化控制。合金元素的參加有利于鑄件性能進步,普通w(Cu)0.4-0.6%或w(Cr)0.2-0.4%。
  3) Alloying control. The addition of alloying elements is conducive to the improvement of casting properties. Ordinary w (Cu) 0.4-0.6% or W (Cr) 0.2-0.4%.
  2、配料
  2. Ingredients
  生鐵的參加量要低于10%,同時采用高廢鋼、高滲碳工藝,這樣石墨質量好。
  The amount of pig iron is less than 10%, and high scrap steel and carburizing process are adopted, so the graphite quality is good.
  3、鐵液溫度
  3. Temperature of molten iron
  高的鐵液溫度可細化石墨,是高碳當量、高強度灰鑄鐵的根底。鐵液溫度為1500-1550℃時,鐵液氧化會減少,SiO2灰渣顯著降低。
  High temperature of molten iron can refine graphite, which is the base of high carbon equivalent and high strength gray iron. When the temperature of molten iron is 1500-1550 C, the oxidation of molten iron decreases, and the SiO 2 ash decreases significantly.
  4、孕育
  4. Pregnancy
山東鋁合金壓鑄
  孕育的辦法比孕育劑的更重要,依據實踐狀況,力圖采用隨流孕育、澆口杯孕育、浮硅孕育、型內孕育等瞬時孕育辦法,確保孕育質量。應采用三角試樣,熱剖析曲線,孕育前后的冷度比來檢驗孕育效果,既要避免孕育缺乏形成的過冷石墨,也要避免孕育壓鑄件過度形成的縮松。
  The method of inoculation is more important than the efficiency of inoculant. According to the practice, the instantaneous inoculation methods such as flow inoculation, gate cup inoculation, float silicon inoculation and in-mold inoculation are tried to ensure the quality of inoculation. Triangular specimen, thermal analysis curve and cooling ratio before and after inoculation should be used to test the inoculation effect. It is necessary to avoid the undercooling graphite formed by lack of inoculation and the excessive shrinkage formed by inoculation of die castings.
  5、性能檢測
  5. Performance testing
  增強對附鑄試棒性能與金相組織的檢測,同時特別要增強對金相中過冷石墨、碳化物及珠光體的檢驗,進步鑄件冶金質量,使其成熟度>1,硬化度<1,質量系數>1。
  In order to improve the metallurgical quality of castings, it is necessary to strengthen the examination of the properties and metallographic structure of the attached cast bar, especially the examination of the undercooled graphite, carbide and pearlite in metallographic phase, so as to make the metallurgical quality of castings more mature than 1, hardening less than 1 and quality coefficient more than 1.
  6、熱時效
  6. Thermal aging
  1)升溫速度應遲緩,普通以(30-50)℃/h為宜。
  1) The heating rate should be slow, and (30-50)C/h is the best.
  2)退火溫度應為500-550℃,保溫時間以每小時燒透25mm計算。
  2) The annealing temperature should be 500-550 C, and the holding time should be calculated by burning through 25mm per hour.
  3)爐溫差控制堅持在±20℃。
  3) The temperature difference of the furnace should be controlled at (+20 C).
  4)熱時效的次第應避免粗加工后,以消弭加工應力。
  4) Thermal aging should be avoided in order to eliminate the processing stress after rough processing.
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