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1·Cold shots develop from low casting temperature, and dirt spots result from pickup of sand or slag by molten metal.

较低的铸造温度会形成冷疤，熔化金属出现的沙粒或炉渣的累积会导致污点。

2·The product is researched successfully based on old ramming castable. Which own higher temperature of cold state and hot state, good inoxidizability and slag resistance, and long service life.

该产品是在老一代铁沟捣打料基础上开发成功的，具有冷态和热态温度高、抗氧化性和抗渣性好，使用寿命长的特点。

3·The position of overflow and thicker inner gate was optimized to reduce the probabilities of cold shut, flow marks and slag. Furthermore, the surface quality of the die casting improves.

提出了在恰当位置设置溢流槽和增大内浇口厚度等改进措施，从而有效降低了铸件冷隔、流痕、夹渣等缺陷的产生，提高了压铸件表面质量。