铸型尖角、易冲砂、掉砂等部位,在造型时总是插上铁钉来加固。用自制的铸铁钉,成本低且铁钉不易变形,表面较粗糙,其加固效果优于商品铁钉。 铸铁钉制做方法如图所示。上型可以采用半永固型,下型采用湿型,随用随做。根据所需加固钉的粗 Casting sharp corners, easy to red sand, sand and other parts out of shape in the always insert nails to reinforcement. With homemade cast iron nails, the cost is low and the nails are not easy to deform, the surface is rough, and the reinforcing effect is better than the nails. Cast iron nail making method as shown. Upper type can be semi-permanent type, the next type of wet type, with the use as done. According to the need to reinforce the nail thick