1.Introduction

In the automotive machinery and aviation industry, it involves the quality control of finished cast iron products such as ductile iron and grey iron, and the rapid burning and sample making of new materials with new components and new brands in the field of research and development. In the face of miscellaneous and diverse alloy types and material quality, most of the carbon elements of the samples are in the state of graphite, so in order to quickly analyze, it needs to be re-fused to achieve whitening effect. In addition, samples of different shapes cannot meet the requirements of analysis, so it is also necessary to remelting them, so that the spectrometer can be used for analysis to quickly analyze whether the components of cast iron finished products are qualified or not, or adjust the formula of single or multiple elements timely according to the analysis results. Commissioned by an engine factory, Ruishenbao used vacuum remelting furnace to prepare samples by argon shielded remelting.

2.Sample making equipment and tools.

2.1. Sample making equipment

VGIRM-01 Automatic vacuum inert gas shielded remelting machine

2.2.flux

Pure iron（99.99%）

2.3.Samples

Customers provide products: ring samples (parts), cylindrical samples (parts), particle samples (new materials);Bulk sample (unknown material)

3. sample prepration

Take the underweighed sample (A g) and add pure iron (B g, about 40-60 g for A+B) into the crucible, Argon gas is pumped into the vacuum chamber to reach the set pressure value. At this time, argon atmosphere protection is realized in the heating chamber of the equipment, and the crucible's spin and swing parameters are set：swing speed 5r/min，angle for 30°，rotational speed 5r/min，reversing time 10S；Preheat at 20%, 35%, 50%, 65% power for 2 minutes respectively,80% power melt for 5min（temperature＞1400℃），One button start, after the completion of the melting process, casting into the copper mold, rapid cooling. Then take out the block sample, Polish the surface to a smooth surface for analysis.

4. Conclusion

The remelting furnace equipped with single or double head melting device  (spin + swing + inverted mold function + centrifugal casting)。It can prevent burning and oxidation under vacuum or vacuum + atmosphere. It can fully automatic smelting of metal block or powder materials, vacuum refining of alloy steel and precision casting.