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选铸铝件时应注意哪些方面?

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  选铸铝件时应注意哪些方面?

  What should be paid attention to when choosing the cast aluminium parts?

重庆快乐十分   下面是济南铸铝件小编总结的选铸件时应注意的几个地方,大家随我一起看一下:

  The following is a summary of the selected parts of Ji‘nan aluminum casting small parts, and we should pay attention to several parts, and let me have a look together:

  裂纹 :1.铸造裂纹。沿晶界发展,常伴有偏析,是一种在较高温度下形成的裂纹在体积收缩较大的合金和形状较复杂的铝铸件容易出现。2.热处理裂纹:由于热处理过烧或过热引起,常呈穿晶裂纹。常在产生应力和热膨张系数较大的合金冷却过剧。或存在其他冶金缺陷时产生。

  Crack: 1. casting cracks. Grain boundary development, often accompanied by segregation, is a crack at higher temperatures, where larger volume shrinkage of alloys and more complex aluminum castings are prone to occur. 2. heat treatment crack: as a result of heat treatment, overheating or overheating caused by often transgranular cracks. The alloy that has a greater stress and thermal expansion coefficient cools off. Or the presence of other metallurgical defects.

重庆快乐十分   产生的原因:1.铸件结构设计不合理,有尖角,壁的厚薄变化过于悬殊2.砂型(芯)退让性不良3.铸型局部过热4.浇注温度过高5.自铸型中取出铸件过早6.热处理过热或过烧,冷却速度过激

  Causes: 1. casting structure design is not reasonable, there are sharp, wall thickness changes too poor 2. (core) sand collapsibility bad 3. mold local overheating 4. casting temperature is too high since the 5. mold casting out early 6. heat treatment of overheating and burning, excessive cooling rate

重庆快乐十分   防止的方法:1.改进铸件结构设计,避免尖角,壁厚力求均匀,圆滑过渡2.采取增大砂型(芯)退让性的措施3.保证铸件各部分同时凝固或顺序凝固,改进浇注系统设计4.适当降低浇注温度5.控制铸型冷却出型时间6.铸件变形时采用热校正法

  Prevent the method: 1. improved casting structure design, and strive to avoid sharp corners, wall thickness uniformity, smooth transition to increase 2. (core) sand collapsibility measures 3. parts at the same time ensuring the casting solidification or sequential solidification, improving pouring system design 4. reducing pouring temperature control 5. mould cooling deformation type 6. castings by heat correction
 

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重庆快乐十分:济南洪业高压电器配件 文章标题:选铸铝件时应注意哪些方面?

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