CN

NEWS

2023

Comparison between film coated Sand casting and sodium silicate investment casting

With the continuous increase in raw material and labor prices, as well as the annual decline in the prices of low-level investment casting products, the profit margin of water glass investment casting products with lower precision requirements has been showing a downward trend. Most investment casting factories that use water glass technology are facing issues of product upgrading and process transformation. It is necessary to find low-cost, convenient and practical casting processes to replace the water glass investment casting process. The dimensional accuracy of film coated Sand casting castings is CT7~CT8, and the surface roughness Ra value is 6.3~12.5 m. The forming quality of the coated sand process can reach the level of water glass investment casting technology, and it is an ideal alternative to water glass investment casting process. The coated sand hot box process has the following advantages compared to the water glass investment casting process. 1. Low cost (1) Less one-time investment in the process of laminating sand hot core box molding (core), and one-time investment in the hot core box molding (core) machine and mold. The price of each molding (core) machine ranges from 1.5-3.97 yuan, and each set of molds ranges from 6000-1000 yuan. The one-time investment in investment casting mold making is relatively large, including molds, wax presses, wax melting furnaces, wax flake machines, wax stirring machines, rain shower sanding machines, boiling sanding machines, dewaxing tanks, roasting furnaces, etc. (2) The only shell making materials for the low production cost coated sand process are coated sand and release agents, while investment casting shell making materials mainly include mold materials, release agents, cleaning agents, molding sand, adhesives, hardening fluids, diesel, etc. There are many types of materials and high costs. The coated sand process only consumes electricity from one molding (core) machine, while investment casting consumes a large amount of electricity due to its large number of equipment. 2. Fewer shell making processes and higher efficiency.