INVESTIGATION ON WEARING OF BLADE OF SAND MIXER USED IN FOUNDRY INDUSTRY TO ENHANCE THE LIFE OF THE BLADE

Mechanical Engineering ( CAD/CAM)

The Foundry sand mixer is very ruggedly constructed from heavy steel sections, with a fixed mixer pan, all mounted on substantial base frame. The motor is installed horizontally, driving the gearbox through a flexible coupling. The rotating mixer unit consist of mixing rotor, which rotate on their own axis and simultaneously revolve around the tank circumference. Rotor consist of three mixing arm with replaceable wear blades. The integral charge hopper, built into the top of the mixer cover, feeds sand into the mixer. Discharge of the regenerated sand from the mixer is achieved by means of a large opening in the pan of the unit. This consists of a circular segment, which opens to allow for the rapid discharge of sand to take place in 10 to 12 seconds. The blade rotation compresses and cascades sand from the ribbed walls to the centre dome. The continuous vortex action created by this tumbling motion produces highly effective mixing. The batch is prepared in a short cycle time, and is discharged as a completely aerated and perfectly homogenous mixture. The present paper analyzes wear causes of a revolving-blade mixer with the most important of them- sticking of grains between the blade end and the bottom. Various hardfacing operations are recommended to reduce the wearing of blade.

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.