Stamping of Mo Crucible

The previous of Mo crucible is made by the turning and processing of the bar.  Most of the metals become chips.The utilization of materials is extremely low, and the cost is high. 

The adoption of the thick molybdenum plate stamping method makes it possible to produce the Mo crucible of which diameter is 66mm and the height is 48mm. The feasibility of this method is based on the special properties and state of the Mo plate.

This method includes two stamping procedures. Therefore, specially designed molds of which material is P6M5 steel are produced for this method. These molds can be stamped by heating to the operating temperature. The first stamping coefficient is 0.64 and the second one is 0.85. After the first stamping, the external diameter of blanks is 78mm, and the external diameter after the second stamping is 66mm.  The radius of the bottom is 25mm and the radius of the side wall is 20 mm.

In order to relax the stress inf the Mo blank, it is important to select the effective lubricant material. After trying out the graphite as the material of lubricant, we found that it is most effective when the heating is not more than 500 °C. The problem is that it is difficult to clean the parts after the stamping. 

The solution to this problem is that we can use the glycerol as the lubricant at the first stamping and use colloidal graphite at the second stamping. It can not only solve the problem of cleaning, but also obtain the Mo crucible without cracks.

When we produce the crucible, the thick molybdenum plate stamping method is adopted which can reduce the scrap loss of Mo by two-thirds of the scrap loss caused by the cutting. As a result, it improves the utilization of the material. With the development of the technology, we have produced the Mo crucible of which diameter is 84mm and the height is 65mm by this stamping method.

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