The process of preparing the maintenance of the “Nicmas” Concern

Production of rods by JSC “Poltava Turbomechanical Plant” Foundry production from SQJ610 alkaline phenolic resin, Italian production by Mazzon company, CO2 hardening (resol-CO2)

Advantages and characteristics of SQJ610 alkaline CO2 curing phenolic tar (resol-CO2):

What is the manufacturing process of rods?

For the manufacture of rods, a special composition is required. This composition consists of quartz sand and resin, sand and this resin are mixed in special runners to prepare core and molding compositions. When the composition is ready, it is sent to the core section for the manufacture of cores.

The production itself consists of taking a core box stuffed with a special composition, if the core box is large, then the core is large, while pneumatic tamping is used, then the composition is frozen with carbon dioxide (CO2), as a result of which the resin itself reacts – solidification, which is in the composition itself and carbon dioxide and during the reaction, this composition hardens. Then the core is removed from the core box, cleaned and painted with a special non-stick coating for foundry production, which does not burn on the casting during mold casting. This non-stick coating reduces the workload even further when trimming the casting, the chipper has less work to clean up burns on all things that are associated with casting molds, as high temperatures can cause burns.

There are special core boxes, they are diverse, the weight of the core can be from 500 grams to 150 kg or more.

What happens to the rod next?

After filling with metal, the rod is knocked out of the workpiece, and in the future this composition is no longer used, because on the Omega molding line, the molds are regenerated. They go on the knockout grate and the same regenerate crumbles back into sand, turns into loose and is further used. But the rod is no longer suitable for work, it is knocked out and thrown away.

In terms of manufacturing time, a small rod takes 3 minutes, a larger rod takes 8 minutes. The rod that we make for a diaphragm for a steam turbine rotor naturally depends on the diaphragm, but it weighs approximately 400-800 kg. there are 1200-1500 kg. they are made in 2-3 days, and this is a more time-consuming and precise process that requires accuracy to the millimeter, or even hundredths of a millimeter.

Such a precise and painstaking process goes through the production of rods, and this is just one of the processes that are necessary to start work before pouring and obtaining a quality casting.