instruments de forage sous-marin

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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  • By deploying these bollards, city planners can enhance urban mobility, reduce traffic congestion, and promote walking and cycling. For example, in downtown areas or popular shopping districts, sliding bollards can allow vehicles to access these zones during certain hours while preventing them during peak pedestrian traffic times. This not only improves safety but also encourages more people to utilize public spaces.