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It is important to know that the shape of the sand has an important impact on the surface finish of the casting. Circular sand is better than triangular sand because the triangular sand has a large gap, which is easy to lead to defects such as porosity; According to the nature of the casting, the sodium silicate quartz sand is selected to form a spalling layer, and combined with the characteristics of cooling and shrinkage of the casting, the surface defects are reduced. Coating a protective layer on the surface of large castings, such as the film on a coated sand mold, can improve the surface finish of the sand mold and reduce the surface defects of the casting.  

In conclusion, drilling machines are at the heart of modern mining operations, playing a critical role in resource extraction while paving the way for technological advancement and environmental responsibility. As the mining industry evolves, so too will the capabilities and methodologies employed in drilling, ensuring the sector remains vital for generations to come.

Conclusion

2. Acier allié Pour des applications nécessitant une résistance accrue à la fatigue et à la corrosion, des barres de forage en acier allié peuvent être utilisées. Ces alliages contiennent des éléments tels que le nickel, le chrome et le molybdène, qui augmentent leur résistance et leur longévité.

Equipment and Technology

(3) If the drilling rig cannot open the hole smoothly, it should first assign the rock drill to retreat, and then let the rock drill move forward to open the hole from the beginning.

1. Depth and Efficiency One of the most significant advantages of DTH rigs is their ability to drill to greater depths compared to conventional rotary drilling methods. They are capable of drilling depths exceeding 100 meters with great precision, which is essential in mining operations for reaching ore deposits.

3. Large Fuel Tank With a sizeable fuel reservoir, the CFM 185 can run for extended periods without the need for frequent refueling. This feature is crucial for large projects that require sustained air pressure and productivity.