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山东铝合金压铸厂家:导致压铸件欠铸的原因!

来源:http://www.jnhjgs.cn     发布时间:2021-06-15 14:32:32    点击:

山东铝合金压铸件在生产过程中,会遇到许多质量问题,也即是作为压铸件常见质量缺陷,其中欠铸即是缺陷之一,那导致压铸件产生欠铸的缘由有哪些,依据知道分析如下:
In the production process of Shandong Aluminum alloy die castings, many quality problems will be encountered, that is, as a common quality defect of die castings, one of which is under casting. What are the causes of under casting
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 die casting, 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. In general, under casting is not allowed.
造成欠铸的缘由有:
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, insufficient, and the metal in the active front solidifies prematurely, under casting occurs in 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 is too low;
内浇口位置不好,形成大的活动阻力。
The gate position is not good, forming a large resistance.
2)气体阻碍,欠铸部位表面润滑,但形状不规则
2) The surface of under cast part is lubricated, but the shape is irregular
                    山东铝合金压铸
难以开设排溢系统的部位,气体积累;
Where it is difficult to set up a drainage system, the gas will accumulate;
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 entrapped.
3)塑料beplay全站app安卓型腔有残留物
3) There is residue in the cavity of plastic mould
涂料的用量或喷涂方法不当,造成局部的涂料沉积。
Improper amount of coating or spraying method will result 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。
The assembling gap of the molding parts is too large, or the sliding cooperation gap is too large, and the metal rushes into when filling. After the casting comes out, it can not be taken out, and the sheet is clamped on the gap. When the kind of sheet metal (the thickness of the metal sheet is the size of the gap) protrudes more on the surrounding mold surface, the height of the projection will be changed into the wall thickness of the casting under the condition of mold closing, so that the future casting will have a groove through (for the wall thickness). This kind of penetrating groove becomes a special form of under casting. This kind of under casting phenomenon often appears in the case of deep cavity made of inlay.
浇料不足(包括余料节过薄)。
Insufficient pouring material (including too thin residual material section).
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 make the nozzle orifice not enough, resulting in a series of poor filling conditions.
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