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决定山东铝合金压铸质量的关键因素是什么?

来源:http://www.jnhjgs.cn     发布时间:2019-06-19 15:58:59    点击:

  铝合金压铸,铝合金压铸厂,锌合金压铸,锌合金压铸厂http://www.jnhjgs.cn进步铝合金压铸件质量关键何在?目前机床铸件大局部为灰铸铁,关于灰铸铁件的质量,要从化学成分、原资料质量、配料、合金化、熔炼温度、孕育处置直至热时效等环境严厉控制。
  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 http://www.jnhjgs.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、熔炼环节
  1. Melting link
  1)碳当量。应采用较高的碳当量,HT250,以3.95为好;HT300,以3.82为好;HT350,以3.76为好。
  1) Carbon equivalent. High carbon equivalent should be adopted, HT250, 3.95, HT300, 3.82 and HT350, 3.76.
  2)硅碳比。倡议比较好将硅碳比控制在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。合金元素的参加有利于铸件性能进步,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
  生铁的参加量要低于10%,同时采用高废钢、高渗碳工艺,这样石墨质量好。
  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、铁液温度
  3. Temperature of molten iron
  高的铁液温度可细化石墨,是高碳当量、高强度灰铸铁的根底。铁液温度为1500-1550℃时,铁液氧化会减少,SiO2灰渣显著降低。
  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
山东铝合金压铸
  孕育的办法比孕育剂的更重要,依据实践状况,力图采用随流孕育、浇口杯孕育、浮硅孕育、型内孕育等瞬时孕育办法,确保孕育质量。应采用三角试样,热剖析曲线,孕育前后的冷度比来检验孕育效果,既要避免孕育缺乏形成的过冷石墨,也要避免孕育压铸件过度形成的缩松。
  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、性能检测
  5. Performance testing
  增强对附铸试棒性能与金相组织的检测,同时特别要增强对金相中过冷石墨、碳化物及珠光体的检验,进步铸件冶金质量,使其成熟度>1,硬化度<1,质量系数>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、热时效
  6. Thermal aging
  1)升温速度应迟缓,普通以(30-50)℃/h为宜。
  1) The heating rate should be slow, and (30-50)C/h is the best.
  2)退火温度应为500-550℃,保温时间以每小时烧透25mm计算。
  2) The annealing temperature should be 500-550 C, and the holding time should be calculated by burning through 25mm per hour.
  3)炉温差控制坚持在±20℃。
  3) The temperature difference of the furnace should be controlled at (+20 C).
  4)热时效的次第应避免粗加工后,以消弭加工应力。
  4) Thermal aging should be avoided in order to eliminate the processing stress after rough processing.
  以上是山东铝合金压铸厂家为大家整理的相关内容,希望能帮到大家,欢迎关注我们网站http://www.jnhjgs.cn,会不定期更新。
  The above is the related content of Shandong Aluminum Alloy Die Casting Factory for you, hope to help you, welcome to pay attention to our website http://www.jnhjgs.cn, will be updated from time to time.
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