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为适应生产大型机床制芯工作的需要,经多次试验,研究,由流态砂改为赤泥自硬砂。目前,我车间80％的泥芯用自硬砂生产,大至八吨,小至几斤。赤泥自硬砂特点(与粘土砂相比): 1.工艺装备简单,芯子尺寸较精确; 2.湿强度小,砂子的流动性好,易于紧实、劳动强度小; 3.芯子烘烤时间短,节约燃料,同时缩短了生产周期,提高了生产率。 (一) 原材料选用: 1.原砂,最好选用粗粒砂,形状为圆形,粒度为20～40或30～50,含
To meet the needs of the production of large-scale machine tool core work, after many tests, studies, from the flow of sand to red mud from the hard sand. At present, 80% of the mud core in my workshop is made of self-hardening sand, which is as large as eight tons and as small as several kilos. Red mud characteristics of self-hardening sand (compared with clay sand): 1. Process equipment is simple, the core size is more accurate; 2. Wet strength is small, sand flow is good, easy to compact, labor-intensive; Baking time is short, fuel savings, while shortening the production cycle, improve productivity. (A) selection of raw materials: 1. The original sand, the best choice of coarse sand, the shape of a round, particle size of 20 to 40 or 30 to 50, with