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铸铝件铸造的关键是什么?

来源:http://weimuhe.cn 发布日期:[2017-07-15 14:20] 浏览:| 重庆快乐十分

重庆快乐十分   What is the key to casting aluminium castings?

  (一)结晶及凝固组织的形成与控制:液体金属的结构,晶核的形成与长大,晶粒的大小、方向和形态等与铸铝铸件的凝固组织密切相关,它们对铸件的物理性能和力学性能有着重大的影响。控制铸件的凝固组织的目的就是为了获得所希望的组织,欲控制凝固组织,就必须对其形成机理、形成过程和影响因素有全面的了解和深入研究。目前已建立的有效控制组织的方法有变质、孕育、动态结品、顺序凝固、快速凝固等。

  (a) the formation and control of crystallization and solidification structure of liquid metal, the crystal nucleus formation and growth, the solidified grain size, direction and shape with cast aluminum castings are closely related, has a significant impact on their physical and mechanical properties of castings. The purpose of controlling the solidification structure of castings is to obtain the desired microstructure. In order to control the solidification structure, the formation mechanism, formation process and influencing factors must be comprehensively understood and deeply studied. At present, the methods for effective control of tissues are deterioration, inoculation, dynamic solidification, sequential solidification, rapid solidification, etc..

重庆快乐十分   (二)铸铝件尺寸精度和表面粗糙度控制:现代制造的许多领域,对铸铝件尺寸精度和外观质量的要求愈来愈高,铸件的近净形化技术改变着铸造只能提供毛坯的传统观念,其目的在于降低物耗、能耗、工耗,并且改善产品的内外质量,争取市场和高效益。然而,铸铝件尺寸精度和表面粗糙度由于受到诸多因素的影响和制约,控制难度很大。铸件是液态成形的,实现近净形化具有的优越性,在结构方面铸件的内腔和外形用铸造方法一次成形,使其接近件的终形状,使加工和组装工序减至少;在尺寸精度和表面质量方面,使铸件能接近产品的终要求,做到元余量或小余量;

重庆快乐十分   (two) the casting dimension accuracy and surface roughness control: many areas of modern manufacturing, the casting dimension precision and surface quality requirements more and more high, the traditional concept of near net shape casting technology change can only provide casting blank, its purpose is to reduce material consumption, energy consumption, power consumption, and improve the the product quality, win the market and high benefit. However, due to the influence and restriction of many factors, the size precision and surface roughness of the cast aluminum parts are very difficult to control. The casting is liquid forming, realize near net shape has the unique superiority in the structure, the casting cavity and shape forming a casting method, the final shape of the parts, the processing and assembly process to a minimum; in terms of dimensional accuracy and surface quality, the casting products can be close to the final requirements do, or small allowance allowance yuan;

  铸铝件的性能特点:

重庆快乐十分   Performance features of cast aluminium parts:

重庆快乐十分   一、可制造出内腔、外形很复杂的毛坯。如各种箱体、机床床身、汽缸体、缸盖等。

  One, can make the inner cavity, the shape is very complex rough. Such as all kinds of box, machine bed, cylinder block, cylinder head and so on.

重庆快乐十分   二、工艺灵活性大,适应性广,液态成型件的大小几乎不限,其重量可由几克到几百吨,其壁厚可由0.5mm到1m左右。工业上凡能溶化成液态的金属材料均可用于液态成型。对于塑性很差的铸铁,液态成型是生产其毛坯或件的的方法。

重庆快乐十分   Two. The technology is flexible and adaptable. The size of liquid forming parts is almost unlimited, and its weight can be from several grams to several hundred tons. Its wall thickness can range from 0.5mm to 1m. In industry, any metal material that dissolves into liquid can be used for liquid forming. For cast iron with poor plasticity, liquid forming is the only way to produce its blanks or parts.

重庆快乐十分   三、液态成型件成本较低。液态成型可直接利用废机件和切屑,设备费用较低。

  Three, liquid molding parts cost less. Liquid molding can directly utilize waste parts and chips, and the equipment cost is low.

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