Silica sol process Stainless steel casting introduction
1、Silica sol process Stainless steel casting is called investment casting or precision casting, is a technology with less or no cutting, is an excellent technology in casting industry.
2、Stainless steel casting not only applies to all types, all kinds of alloy casting, and the production of casting dimensional is accuracy, surface quality higher than other casting methods.
Model NO.: Customized
Casting Method: Thermal Gravity Casting
Application: Oil and Gas
Surface Roughness: Ra3.2
Certification: CE, ISO 9001:2000
Specification: Class 150lb~2500lb, Size 1/2"~56"
HS Code: 8481804090
Type: Chemical Hardening Sand
Sand Core Type: Resin Sand Core
Machining: CNC Machining
Surface Treatment: Sand Blast
Inspection: International Inspection Report of Each Process
Transport Package: Standard Export Packing
Silica Sol Casting principle
1、The so-called investment casting process, simply speaking, it is to use fusible material (such as wax or plastic) to make fusible model (referred to as the melt or model), coated with several layers of special fire-resistant coating, after drying and hardening, to form an integral shell, the model is then melted from the shell with steam or hot water, the shell is then placed in a sand box, filled with dry sand around, and finally the shell is placed in a roaster and subjected to high temperature Roasting (if use high-strength shell, you can directly roasting the shell without model after demolding), After the mold or shell has been fired, the molten metal is cast therein to obtain the castings.
2、Investment casting size accuracy is high, generally up to CT4-6 (sand cast CT10 ~ 13, die-casting CT5 ~ 7), of course, due to the complexity of the investment casting process, there are many factors of effecting casting dimensional accuracy, such as shrinkage of the mould material, the deformation of the mold, the change of the line volume of the shell during heating and cooling, the shrinkage rate of the alloy and the deformation of the casting during the solidification process, etc. Although the dimensional accuracy of the ordinary investment casting is relatively high, Consistency still needs to be improved. (Consistency of castings with medium and high temperature waxes should be much improved.)
3、Molding press, the cavity surface finish with high pressure, therefore, the surface finish of the investment is relatively high. In addition, the shell is made of a refractory coating of high temperature resistance coated on a melt mold, which is formulated with special binders and refractory materials, and has a high degree of surface finish on the surface of the cavity. in direct contact with the molten metal. Therefore, the investment casting surface finish than the average casting high, generally up to Ra.1.6 ~ 3.2μm.
Advantage of investment casting
1、The biggest advantage of investment casting is, due to the investment casting has a high dimensional accuracy and surface finish, it can reduce the machining work, only the parts with higher requirement need to leave a little allowance, even some of the castings need only allowance of grinding, polishing, you can directly use without machining. Thus, the use of investment casting method can save a lot of machine tools and processing time, a substantially saves metal raw materials.
2、Another advantage of the investment casting method is that it allows the casting of complex castings of various alloys, in particular of superalloy castings. Such as jet engine blades, its streamlined profile and the cooling cavity, using mechanical processing is almost impossible to form. With investment casting process can do mass production, to ensure the consistency of the casting, and to avoid residual machining after machining stress concentration.