les rochers en alliage dur

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.  

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The 185 CFM diesel air compressor stands out as a powerful, efficient, and versatile tool in various industries. Its combination of high performance, fuel efficiency, and durability makes it a preferred choice for professionals and businesses. Whether for construction, road work, or other demanding applications, the 185 CFM diesel air compressor undoubtedly plays a crucial role in enhancing productivity and efficiency on the job site. For anyone looking to invest in a reliable air compressor, this model certainly deserves consideration.


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The DTH hammer operates through a system of compressed air. High-pressure air is directed down the drill string, powering the hammer at the end of the drill bit. The hammer strikes the bit with considerable force, fracturing the rock immediately beneath it. As the bit penetrates further, the broken rock is then cleared from the hole by the same air stream, allowing for continuous drilling without the interruptions often associated with other drilling methods.


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