目前、制造壳型用得最普遍的是“C”法,即用反斗(?)砂的方法.这种方法需要昂贵的粘结剂——树脂,增加了壳型铸造的成本.减少树脂用量有三个方向:一是改善树脂本身性能;其次是减少树脂在混合料中的百分比(如改进混合料的混合方式,采用复膜砂或在混砂过程中采用能溶解树脂的湿润剂);第三个方向是增加壳型的强度,这样就可以把壳型做得更薄.吹压法就是从改进制造壳型过程中,增加壳的强度,以减少树脂用量的一种方法.吹压法的原理是将吹、热、加压三个过程结合起来.即用吹的方法做出一个壳,而在硬化过程中对壳同时加热和加压.吹压法造型机的主要操作过程有五个工 At present, the most commonly used method of making the shell is the “C” method, which is a method of using anti-sand (sand), which requires an expensive binder resin to increase the cost of shell casting, There are three directions for usage: one is to improve the properties of the resin; the second is to reduce the percentage of the resin in the mix (eg, to improve the mixing of the mix, the use of laminating sand or a humectant capable of dissolving the resin during the sand mixing) The third direction is to increase the strength of the shell, so that the shell can be made thinner.Pressure is the shell from the process of improving the shell, increasing the shell strength, in order to reduce the amount of resin a way. The principle of the law is to combine the three processes of blowing, heating and pressurizing, that is, to make a shell by blowing while heating and pressurizing the shell at the same time in the hardening process. The main operation process of the blowing machine is: Five workers