moulding sand

简明释义

型砂

英英释义

例句

1.The quality of the moulding sand directly affects the final product's surface finish.

铸造砂的质量直接影响最终产品的表面光洁度。

2.After several uses, the moulding sand needs to be refreshed to maintain its properties.

经过多次使用后，铸造砂需要被更新以保持其特性。

3.The mixture of clay and sand forms the ideal moulding sand for our project.

粘土和沙子的混合物形成了我们项目的理想铸造砂。

4.Before starting the casting process, we need to prepare the moulding sand properly.

在开始铸造过程之前，我们需要正确准备铸造砂。

5.The foundry uses high-quality moulding sand to create precise metal castings.

铸造厂使用高质量的铸造砂来制造精确的金属铸件。

作文

The process of casting is one of the oldest manufacturing techniques known to humanity. It involves pouring molten metal into a mold to create a specific shape. A crucial component of this process is the material used to form the mold itself, commonly referred to as moulding sand. This special type of sand is engineered to withstand high temperatures and provide the necessary support for the molten metal during the casting process.Moulding sand is typically composed of silica sand, clay, and water. The silica provides the structure, while the clay acts as a binder that helps to hold the sand grains together. Water is added to achieve the right consistency, making the sand pliable enough to be shaped into molds. The quality of moulding sand is paramount; it must have the right balance of grain size, plasticity, and permeability to ensure that the final cast product meets the desired specifications.One of the key characteristics of moulding sand is its ability to retain heat. This property allows it to maintain the shape of the mold even when exposed to the extreme temperatures of molten metal. Additionally, good moulding sand should also have excellent flowability, which ensures that the sand can fill all the intricate details of the mold without leaving any gaps or air pockets.There are different types of moulding sand used in the industry, each serving a specific purpose. For example, green sand is a mixture of sand, clay, and water, and is called 'green' because it is used in its moist state. This type of moulding sand is popular due to its cost-effectiveness and ease of use. On the other hand, resin-bonded sand is treated with a resin that hardens when heated, providing a more durable mold but at a higher cost.The preparation of moulding sand is an art in itself. The sand must be thoroughly mixed to ensure that the clay is evenly distributed throughout the mixture. This uniformity is essential for creating a strong mold that can withstand the pressure of the molten metal. Once prepared, the moulding sand is packed around a pattern, which is a replica of the object to be cast. After the sand has been compacted, the pattern is removed, leaving a cavity that will be filled with molten metal.In conclusion, moulding sand plays a vital role in the casting process. Its unique properties and versatility make it an indispensable material in the foundry industry. Understanding the characteristics and types of moulding sand can greatly enhance the quality of the cast products, leading to better performance and durability. As technology advances, the development of new types of moulding sand continues to evolve, promising even greater efficiency and effectiveness in metal casting processes.

铸造过程是人类已知的最古老的制造技术之一。它涉及将熔融金属倒入模具中以创建特定形状。这个过程中的一个关键组成部分是用于形成模具的材料，通常称为铸造砂。这种特殊类型的砂经过工程设计，能够承受高温，并在铸造过程中为熔融金属提供必要的支持。铸造砂通常由二氧化硅砂、粘土和水组成。二氧化硅提供结构，而粘土作为粘合剂，有助于将砂粒结合在一起。添加水以达到适当的一致性，使砂具有足够的可塑性以便成型。铸造砂的质量至关重要；它必须具备适当的颗粒大小、可塑性和透气性，以确保最终铸件符合所需规格。铸造砂的一个关键特性是其保持热量的能力。这一特性使其能够在暴露于熔融金属的极端温度时保持模具的形状。此外，优质的铸造砂还应具有出色的流动性，这确保了砂能够填充模具的所有细节，而不留任何空隙或气泡。工业中使用不同类型的铸造砂，每种砂都具有特定的用途。例如，绿砂是一种由砂、粘土和水混合而成的砂，因其在潮湿状态下使用而被称为“绿”砂。这种类型的铸造砂因其成本效益和易用性而受到欢迎。另一方面，树脂结合砂则用树脂处理，在加热时硬化，提供更耐用的模具，但成本较高。铸造砂的准备本身就是一门艺术。砂必须充分混合，以确保粘土均匀分布在混合物中。这种均匀性对于创建能够承受熔融金属压力的坚固模具至关重要。准备好后，铸造砂被压实在一个模型周围，模型是待铸造物体的复制品。砂被压实后，模型被移除，留下一个空腔，待填充熔融金属。总之，铸造砂在铸造过程中发挥着至关重要的作用。其独特的性质和多功能性使其成为铸造工业中不可或缺的材料。理解铸造砂的特性和类型可以极大地提高铸件的质量，从而提高性能和耐久性。随着技术的进步，新型铸造砂的开发不断演变，承诺在金属铸造过程中实现更高的效率和效果。