在用树脂砂造型中，多数需要用上、下型板分开造型，这就对砂箱的定位要求非常严格。根据某厂粗略统计，由于砂箱销套年久失修、生锈，砂箱定位不准确，使铸件产生错箱缺陷的约占报废铸件的４０％左右。以往曾用过多种定位方法，如砂锥定位、在型板上刻出砂箱中心线定位等，但 Resin sand molding, the majority of the need to use the upper and lower plate separate shape, which on the sandbox positioning requirements are very strict. According to the rough statistics of a factory, the sand box pinset is out of repair and rusty for a long time, and the positioning of the sand box is inaccurate, so that about 40% of scrap castings are caused by casting box defects. In the past have used a variety of positioning methods, such as sand cone positioning, carved in the sand mold centerline positioning, etc., but