Which of the following is a discontinuity which might be found in sand castings?
砂型铸件上可能发现下列哪种缺陷？
Automotive Components Projects Under Planning: Foundry 1. Investment Castings 2. Sand Castings.
计划中有关汽车零部件顶目：铸造厂1。精密铸件2。砂铸件。
It is the key to guarantee stable and consistent quality of clay molding sand in mass-production of sand castings.
稳定地保证粘土型砂质量是大批量粘土砂铸造生产中的关键问题之一。
The finning defects on inner surfaces of castings caused by resin sand cores were introduced, their names and definitions were discussed.
介绍了铸件内腔表面因树脂砂芯引起的飞翅缺陷，并对其名称和形成机理进行了探讨。
The cooling rate is faster in chromite sand mold, but also causes more porosity in castings.
铬砂制作的砂模可让铸件有较快的冷却速率，但也产生较多的微孔隙。
Furan resin sand is poor in collapsibility when it is used for al alloy casting, specially for some large, thin section castings.
呋喃树脂砂用于铝合金铸造时，特别是对于一些大型、薄壁铝合金铸件，型芯的溃散性较差。
When using in moulding sand, it can promote oriental solidification of castings and prevent burn-on and sand inclusion of castings, and improve roughness of castings.
在铸造生产中可以促进铸件的方向性凝固，防止粘砂、夹砂等铸造缺陷和改善铸件表面粗糙度。
The resin-coated sand lined permanent mould casting process was adopted to increase density and dimensions accuracy of castings.
为提高铸件致密度和尺寸精度，采用覆砂铁型铸造工艺。
We can also adopt sand shell moulding or metal mold casting as for allotype castings.
对异形铸件，还可用砂型铸造或金属型铸造。
Finally, the conditions of molding sand for obtaining best quality castings are also provided.
在本文的最后还提出获得品质优良型砂的条件。
The use of coal-dust with high lustrous carbon in molding sand can improve surface roughness of the castings.
光亮碳高的煤粉用于型砂，可降低铸件表面粗糙度值。
The new water-based mold coating for resin-bonded sand mold and core for aluminium castings has been developed.
为铝铸件树脂砂型芯研制出新型的水基浅色涂料。
Precision injection molding, casting, mold repair metal jewelry and accessories, precision stampings, welding, lost wax castings, aluminum castings, stainless steel sand hole repair.
精密注塑、压铸、模具的修补金属饰品及配件、精密冲压件的焊接、失蜡铸件、铝铸件、不锈钢产品砂孔修补。
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。
This research mainly explores the production of steel castings with air flush molding green sand and the improvement of its character from the molding sand recipe and mold sand system control.
本研究主要探讨了用气冲造型湿型砂来生产铁路钩缓铸钢件，从型砂的配方和型砂系统的控制等几个方面来优化其性能。
The elimination of surface defects has indicated that proper selection of sand properties are important to improve the surface quality of gray iron cylinder block and head castings.
实践结果表明型砂性能对于铸件表面质量有着重要的影响，选择合适的型砂性能能够显著提高铸件表面质量。
Technical properties and some factors of influence of the PEPSET no bake resin bonded sand when applied on aluminium castings are studied.
通过试验研究了PEPSET树脂自硬砂工艺应用于铝铸件生产的性能及其影响因素。
The influence of graphite sand on the microstructure and mechanical properties of magnesium alloys were studied, and the black spot defeat on magnesium alloy castings were investigated.
前言：研究了石墨砂对镁合金组织和性能的影响，并对铸造过程中产生的“黑点” 缺陷进行了分析。
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.
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。
When low alloy steel replaced carbon steel castings, a series of questions were uncovered in traditional sand casting process.
铸钢材质升级为低合金钢后，传统的砂型铸造工艺在生产中暴露出了一系列问题。
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.
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。
A difficult foundry problem about the cast shaping of the small and deep holes in the heavy section steel castings can be solved by using the no bake sand. for making cores.
用这种型砂制作型芯，可解决厚大铸钢件内不易铸出的小径深孔腔室的成形难题。
The reasons resulting in the shrinkage porosity, gas-hole and impacted sand in bronze castings were analyzed.
分析了锡青铜叶轮铸件出现的缩孔、气孔、冲砂等缺陷的原因。
Several cylindrical castings with different modulus and size of riser necks cast in furan bonded silicon sand molds are examined and analyzed numerically.
在呋喃树脂砂型条件下，针对不同模数、不同冒口颈尺寸的圆柱试样进行了模拟计算和浇注试验。
The results show that the strength and hardness of the mold produced by this method are much higher than those of normal sand mold, suitable for producing high precision thin wall castings.
结果表明：此工艺方法生产的铸型，其强度、硬度远高于一般铸型，适合于生产尺寸精度高的铸件。
The sand core structure provided by the utility model can solve the difficult technique problems of core shooting and chocking in casting simply and effectively, and improve the yield of the castings.
本实用新型所提出的砂芯结构，可简单而非常有效的解决铸造生产中射芯呛火的技术难题，提高铸件的成品率。
By adopting the compound mold of die mold, furan resin sand and graphite sand, the heavy duty thin wall complex Al-alloy castings have been successfully produced.
采用金属型、呋喃树脂砂、石墨砂等复合铸型，成功生产了大型、薄壁、复杂铝合金铸件。
The reason causing nodularization degeneration in surface layer of furan resin sand nodular iron castings was analyzed.
对呋喃树脂砂球墨铸铁件表层球化衰退原因进行了分析。
These alloys are used for welding and brazing filler materials and for sand and die castings.
这些合金用于定位焊接和铜焊的焊料，和用做打磨或模铸。
These alloys are used for welding and brazing filler materials and for sand and die castings.
这些合金用于定位焊接和铜焊的焊料，和用做打磨或模铸。
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