砂型铸件上可能发现下列哪种缺陷？
Which of the following is a discontinuity which might be found in sand castings?
结果表明，与砂型铸件相比，消失模法生产的铸件尺寸精度及质量提高，工艺出品率提高到65%以上。
Results showed that compared with sand casting castings, dimension precision and quality of lost pattern castings can be improved and rate of finished products can be increased up to65percent.
随着新的铸造工艺的不断出现，未来砂型铸件的产量可能会有所减少，但是专家断言，绝大部分铸件依然要靠砂型工艺进行生产。
Although sand casting production may decrease with new casting technologies emerging, it is asserted that the vast majority of castings would have to be produced by sand casting technology.
是塑料模具及一般简易冲压模具的首选材料，也适用于汽车及其它工业部门用的各种砂型及金属型铸件。
Prime materials for the plastic injection moulds and general pressing moulds, also suitable for making diverse sand and metallic casting components for the auto and other industrial sector purposes.
在砂型中浇注时，凝固期间铸件外表面温度接近的中心温度，与形状无关。
The outer surface temperature of the sand casting approximates its center temperature in the solidification period and it is independent of the casting shape.
对异形铸件，还可用砂型铸造或金属型铸造。
We can also adopt sand shell moulding or metal mold casting as for allotype castings.
紧实度均匀、能抵抗金属液体冲击的合格砂型是保证铸件质量的关键因素之一。
The green sand mold with even density and proof of the impact of liquid metal is one of the critical factors in the production of quality casting.
用途：适用于砂型成型的铸件车间、炼钢和炼铁炉衬的修补以及建筑场所的混凝土捣固作业。
Application:Used for sand casting mould workshop, repairing the lining of steel making furnace and impacting the con crete on building.
由于型号弹上产品中壳体类铸件的砂型铸造生产不能满足要求，项目通过采用低压铸造工艺方法提高了铸件产品的内部质量。
Since the sand shell modeling production of the hull casting cannot meet the needs required, this project adopts low-pressure foundry techniques to improve the internal quantity of products.
特大型不锈钢阀体熔模精密铸造与砂型铸造比较，最大的问题是铸件的凝固控制。
Compared with large stainless steel valve body in sand casting, it was difficult to control solidification process in investment casting, which results in some defects in the valve body.
介绍了一种树脂砂型专用的低压铸造设备，适用于优质大型薄壁铝合金铸件的生产。
A low pressure casting equipment has been developed, which is specially designed for the production of large-size thin-walled high-quality aluminum alloy parts with resin sand molds.
主要从事铸件出口业务，铸铁，铸铝，铸铜，锻造，精密铸造，砂型铸造。
Handling casting business, cast iron, cast steel, Die-Alumminum, cast bronze, forgings, investment casting, sand casting and so on.
通过改进型砂配方，提高砂型紧实度和煤粉质量，是提高大口径阀门铸件表面质量的有效途径。
The surface quality of huge bore valves has been improved by changing the matches of molding sand, and increasing the hardness of sand mould and controlling the quality of the coal ash.
为铝铸件树脂砂型芯研制出新型的水基浅色涂料。
The new water-based mold coating for resin-bonded sand mold and core for aluminium castings has been developed.
工作能力比较大，适用于大、中型铸件砂型的捣固。
It is working capacity is comparatively large and is used for tamping large and Middle sand mould castings.
中小型尺寸的铸件砂型是在一个砂箱中制造，砂型由两部分或更多部分组成，以利于模型的顺利取出。
Sand molds for the production of small and medium-sized castings are made in a molding box. The mold is made in two or more parts in order that the pattern may be removed.
中小型尺寸的铸件砂型是在一个砂箱中制造，砂型由两部分或更多部分组成，以利于模型的顺利取出。
Sand molds for the production of small and medium-sized castings are made in a molding box. The mold is made in two or more parts in order that the pattern may be removed.
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