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貴州鑄造廠家對鑄鐵件的影響因素介紹

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貴州鑄造廠家對鑄鐵件的影響因素介紹

發布日期:2018-02-11 作者:貴州鑄造廠家 點擊:

貴州鑄造廠家對鑄鐵件的影響因素介紹

貴州鑄造廠家

Introduction of influence factors of cast iron castings by Guizhou foundry


貴州鑄鐵件的影響因素介紹如下:

The influencing factors of Guizhou iron castings are as follows:


1、磷:鐵液中含磷量偏高,使凝固范圍擴大,同時低熔點磷共晶在最后凝固時得不到補給,以及使鑄件外殼變弱,因此有增大縮孔、縮松產生的傾向。一般工廠控制含磷量小于0 08%。

1, phosphorus: high phosphorus content in molten iron makes the solidification range expand. Meanwhile, low melting point phosphorus eutectic can not get recharge at final solidification, and make casting shell weaken, so there is a tendency to increase shrinkage porosity and porosity. The phosphorus content of the General Factory is less than 0 08%.


2、澆冒口及冷鐵:若澆注系統、冒口和冷鐵設置不當,不能保證金屬液順序凝固;另外,冒口的數量、大小以及與鑄件的連接當否,將影響冒口的補縮效果。

2, pouring riser and chill: if the gating system, riser and chill are not set properly, the sequential solidification of metal can not be guaranteed. Besides, the number and size of risers and the connection with the casting will affect the feeding effect of risers.


3、稀土和鎂:稀土殘余量過高會惡化石墨形狀,降低球化率,因此稀土含量不宜太高。而鎂又是一個強烈穩定碳化物的元素,阻礙石墨化。由此可見,殘余鎂量及殘余稀土量會增加球鐵的白口傾向,使石墨膨脹減小,故當它們的含量較高時,亦會增加縮孔、縮松傾向。

3, rare earth and magnesium: the high residual amount of rare earth will deteriorate the shape of graphite and reduce the spheroidization rate, so the content of rare earth should not be too high. Magnesium is also an element that strongly stabilizes carbides, which hinders graphitization. It can be seen that residual magnesium content and residual rare earth content will increase the chilling tendency of ductile iron and decrease the expansion of graphite, so when their content is higher, it will also increase shrinkage porosity and porosity.


4、溫度:澆注溫度高,有利于補縮,但太高會增加液態收縮量,對消除縮孔、縮松不利,所以應根據具體情況合理選擇澆注溫度,一般以1300~1350℃為宜。

4, temperature: pouring temperature is high, which is good for shrinkage, but too high will increase the volume of liquid shrinkage, which is unfavorable to eliminate shrinkage and porosity. Therefore, casting temperature should be chosen according to the specific circumstances, generally 1300~1350 degrees.


5、壁厚:當鑄件表面形成硬殼以后,內部的金屬液溫度越高,液態收縮就越大,則縮孔、縮松的容積不僅絕對值增加,其相對值也增加。另外,若壁厚變化太突然,孤立的厚斷面得不到補縮,使產生縮孔縮松傾向增大。

5, wall thickness: when the surface of the casting is hard shell, the higher the temperature of the molten metal is, the greater the shrinkage of the liquid will be. The volume of shrinkage and porosity will not only increase, but also increase the relative value. In addition, if the wall thickness changes too suddenly, the isolated thick section can not be made up, which makes the shrinkage and loosening tendency increase.


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