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采用冷硬树脂砂制造的砂型(芯),具有强度高、表面光滑、透气性好和溃散性好等优点。但是,冷硬树脂砂对模样和芯盒却有较强的粘附性,生产中若不采取措施加以防止,势必会影响砂型(芯)质量,降低生产率。我厂对上述问题主要是从以下几个方面解决的。一、模样和芯盒用冷硬树脂砂制造的砂型(芯)必须要在硬化以后才能起模,所以,要求模样表面和芯盒内表面要光滑,精度要高,拔模斜度可适当增大,不易出
The use of cold sand made of resin sand (core), with high strength, smooth surface, good air permeability and good collapsible advantages. However, the chilled resin sand has strong adhesiveness to the sample and the core box. If no measures are taken in the production, it will inevitably affect the quality of the sand core and reduce the productivity. Our factory mainly solves the above problems from the following aspects. First, the appearance and shape of the core box Made of cold sand resin sand (core) must be cured after the mold, so the requirements of the surface of the sample and the core box to be smooth, high precision, draft can be appropriately increased by Big, not easy to go out