We have talked about two units of the die casting machine maintenance before.
We will talk about the crucible maintenance in the following parts.

1. Please clean the dust, rust in the crucible before usage.

2. Warm-up crucible to around 80℃ and not access to 100℃. And then coat it two or three times to acquire compactness coatings.

3. Heat the crucible to between 200℃ and 300℃ slowly and then dry it.

4. Use a recycled material when melting the materials first time. If you don’t have the recycle material, please cut the alloy ingots into small pieces to
ensure the alloy contact with crucible closely.
Please put the whole alloy ingots intot the crucible to avoid bad heat transmission effectiveness caused by small contact areas between the alloy ingots and crucible.
Besides, the whole alloy ingots are hard to melt. The crucible is easy to be damaged too.

5. The Al alloy casting temperature is usually between 620℃ and 680℃. If operators set too high temperature, the alloy liquid is easy to over-heated and
speed up the alloy oxidation. So please reduce working temperature of the melting furnace if it meets the casted items production.

6. The highest working temperature inside the crucible is more than 800℃ when the furnace is working. So it becomes weak and is easy to broke.
Make sure slide the materials along the crucible when adding the materials.

7. Make sure warm up the ingots if you will add ingots when production to avaoid explosive caused by water in the alloy ingots.

8. Al alloy liquid will corrade iron of the crucible and then form crack.
The wasted silicon sedimentate on the crucible bottom, the heating delivery become worse, the fuel is also wasted too.
In order to ensure the safety and liquid quality, the crucible should be cleaned and coated regularrly when it is used constantly.
Ordinary speaking, clean the crucible every 150 hours and coat it again and rotary the crucible 120 degree.

9. Pull all alloy liquid from the crucible when the furnace is stopped to avoid damage the crucible when open the furnace again.

10. Notice. Make sure heat the furnace steps when melting the mateirals first time. Heat the crucible to the working temperature is prohibited.
Because the crucible is easy to broke if it is heated in a short time.