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山东铝合金压铸分析导致铝铸件欠铸的原因有哪些?

来源:http://www.jnhjgs.cn     发布时间:2020-08-18 14:12:15    点击:

  铝合金压铸件成形过程中,某些部位填充不完整,称为欠铸。当欠铸的部位严重时,可以作为铸件的形状不符合图纸要求来看待。通常关于欠铸是不允许存在的。
  In the forming process of aluminum alloy die castings, some parts are not filled completely, which is called under casting. When the under cast part is serious, it can be regarded as the shape of the casting does not meet the requirements of the drawing. Generally speaking, under casting is not allowed.
  造成欠铸的原因有:
  The causes of under casting are as follows
  1.填充条件不良,欠铸部位呈不规则的冷凝金属;
  1. The filling condition is not good, and there is irregular condensed metal in the under cast part;
  当压力不足、不够、活动前沿的金属凝固过早,造成转角、深凹、薄壁(甚至薄于平均壁厚)、柱形孔壁等部位产生欠铸。
  When the pressure is insufficient, the metal in the active front solidifies too early, resulting in under casting at the corner, deep concave, thin wall (even thinner than the average wall thickness) and cylindrical hole wall.
  beplay全站app安卓温度过低;
  The mold temperature is too low;
  合金浇入温度过低;
  The pouring temperature of alloy is too low;
  内浇口位置不好,形成大的活动阻力。
  The location of the inner gate is not good, which results in large moving resistance.
  2.气体阻碍,欠铸部位表面润滑,但形状不规则
  2. The surface of the under cast part is lubricated, but the shape is irregular
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  难以开设排溢系统的部位,气体积累;
  Where it is difficult to set up the overflow system, the gas accumulates;
  熔融金属的活动时,湍流剧烈,包卷气体。
  When the molten metal moves, the turbulence is violent and the gas is wrapped up.
  3.塑料beplay全站app安卓型腔有残留物
  3. There is residue in the cavity of plastic mold
  涂料的用量或喷涂方法不当,造成局部的涂料沉积。
  The amount of coating or spraying method is improper, resulting in local coating deposition.
  成型零件的镶拼缝隙过大,或滑动合作间隙过大,填充时窜入金属,铸件脱出后,并未能被彻底带出而呈现片状夹在缝隙上。当之种片状的金属(金属 片,其厚度即为缝隙的大小)又凸于周围型面较多,便在合模的情况下将凸出的高度变成适为铸件的壁厚,使今后的铸件在该处产生穿透(对壁厚来说)的沟槽。这 种穿透的沟槽即变成欠铸的一种特殊形式。这种欠铸现象多在由镶拼构成的深腔的情况下出现。
  When filling, the metal will run into the metal when filling. After the casting is pulled out, it can not be brought out completely and the flake is clamped on the gap. When the sheet metal (the thickness of the metal sheet is the size of the gap) is more convex on the surrounding mold surface, the height of the projection will be changed into the wall thickness of the casting under the condition of closing the mold, so that the future casting will have a groove penetrating (for the wall thickness). This penetrating groove is a special form of under casting. This kind of under cast phenomenon often occurs in the case of deep cavity composed of mosaic.
  浇料不足(包括余料节过薄)。
  The pouring material is insufficient (including the surplus material section is too thin).
  立式压铸机上,压射时,下冲头下移让开喷嘴孔口不够,造成一系列的填充条件不良。
  On the vertical die casting machine, the lower punch moves down to get away from the nozzle orifice, resulting in a series of poor filling conditions.
  以上是关于导致铝合金压铸件欠铸的原因的分析归纳,希望对大家有所帮助,如您想要了解更多内容欢迎点击山东铝合金压铸http://www.jnhjgs.cn网站。
  The above is about the causes of aluminum alloy die casting under casting, hope to help you, if you want to know more, welcome to click Shandong Aluminum alloy die casting http://www.jnhjgs.cn Website.
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