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山东铝合金压铸模具中有必要加入硅吗?

来源:http://www.ok9868.com     发布时间:2020-12-22 18:24:46    点击:

有一种说法是在铝合金压铸模具中加入硅可提高合金的流动性应用,其实,这种说法是不全 面的,但也有从误导的偏差。 接下来,山东铝合金压铸来了解下加入硅的主要目的。
There is a saying that adding silicon into aluminum alloy die casting mould can improve the application of alloy fluidity. In fact, this statement is not comprehensive, but there are misleading deviations. Next, Shandong Aluminum alloy die casting to understand the main purpose of adding silicon.
1、加硅能增加流动性。此作用主要是用于重力铸造,如低压下灌装。事实上,加或不加硅在超过1MPa的充型压强下充型的合金,并没有得到多少的差异。今天的铸造过程中,填充压力可以大于100兆帕,流动性差,没有合金填充不足的问题。
1. Adding silicon can increase the fluidity. This function is mainly used for gravity casting, such as filling under low pressure. In fact, there is not much difference between the alloy with or without silicon at the filling pressure of more than 1MPa. In today's casting process, the filling pressure can be greater than 100 MPa, the fluidity is poor, and there is no problem of insufficient alloy filling.
                                                        山东铝合金压铸
2、可以减少“液 - 固”相转变的体积收缩,来确定基于几个实验中,硅的约20%的铝的量,可以实现在相变的体积几乎没有变化。因此,如果是使用在进行高温工作场合的铝活塞,一般来说会是含硅比较具有较高的合金。由于在铸造工艺的特性的性质,高压填充在一个方向铸造金属,不具有反向进给的功能,这是它的低压铸造,重力铸造具有反向馈送的填充处理特性完全不同的地方。正是因为这个问题原因,行业上才特意配制相变收缩率比较低,含硅量尽量高,专门人员为了提高压铸工艺技术不能通过反向补缩。
2. The volume shrinkage of the "liquid-solid" phase transition can be reduced to determine that based on several experiments, the amount of about 20% aluminum in silicon can be achieved with almost no change in the volume of phase transformation. Therefore, if it is used in high-temperature working occasions of aluminum piston, generally speaking, it will have higher alloy containing silicon. Due to the characteristics of the casting process, high-pressure filling can cast metal in one direction without the function of reverse feeding. This is the filling treatment characteristics of low-pressure casting and gravity casting with reverse feeding. It is precisely because of this problem that the industry specially formulated phase transformation shrinkage rate is relatively low, silicon content is as high as possible, professionals in order to improve the die casting process technology can not pass the reverse feeding.
在合金中加入硅有缺点我们同时也伴随着一些缺点,这样的代价是很大程度上降低了传统合金的强度,且更加系统脆弱,其延伸率也明显有所下降。
Adding silicon into the alloy has some disadvantages. At the same time, we also have some disadvantages. The cost is that the strength of the traditional alloy is greatly reduced, and the system is more fragile, and its elongation is also significantly reduced.
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