Advantages of film coated Sand casting technology: with the rising prices of raw and auxiliary materials and labor, and the profit margin of casting commodities, there has always been a downward trend. It is necessary to search for low-cost, convenient and useful casting technologies to replace traditional technologies. The appearance of the coated Sand casting technology is applied. The dimensional accuracy of the coated Sand casting technology castings is CT7~CT8, and the surface roughness Ra value is 6.3~12.5m. The forming quality of coated sand technology can reach the level of water glass investment casting technology, which is a relatively ambitious technical method. The advantages of film covered Sand casting technology: 1. low cost (1) one-time investment less film covered Sand casting technology molding (core) one-time cast into hot box core shooter and mold. The price of each core shooting machine ranges from 16000 to 35000 yuan, and each mold set ranges from 6000 to 10000 yuan. (2) Low production cost plastic coated Sand casting technology shell making information only needs plastic coated sand and release agent, and only one core shooter consumes power for plastic coated sand technology shell making. 2. Less shell making links and high efficiency (1) Less shell making links and short production cycle Film coated Sand casting technology uses air pressure to blow the film coated sand into the metal mold cavity, selects an electric heating rod to heat the metal mold to harden the film coated sand, and then forms a shell, which can be poured in a box. The heating process only requires 1-3min (depending on the workpiece), with short cycle and few links. The use of coated sand hot core box technology and the use of duplex core shooting machines have a production value of 150 molds per shift, 12 castings per mold, and 1800 castings per shift. The per capita production value is 6 times that of artificial appearance. Film coated Sand casting casting technology has good formability, clear outline, and can be poured by using the method of folding box. The technical output rate is high, which can reach more than 90%. The production process requires only three processes: shell making, pouring and finishing. The technical process is simple, and is less affected by environmental factors. As long as the mold structure is reasonably designed, the molten iron quality is outstanding, and the pouring speed is appropriate, qualified castings can be obtained. The process is simple and controlled. Film coated Sand casting casting technology has good production environment, low labor intensity, good collapsibility of film coated sand, intense burning in the pouring process, less emission of free phenol during pouring, self collapse of the shell after pouring, and simple casting finishing.