Castings using other types of molding processes not requiring removal of core or molding sand normally will be processed in a different flow pattern, eliminating the need for a shakeout operation and usually starting with fin and riser removal.
it is desirable to process castings through a shakeout before defining.
The shakeout, cooling, cleaning and secondary shakeout before shotblast and definning operations remain essentially the same.
A low-cost method of conveying castings from the molding shakeout to the cleaning room uses metal container's or tubs transported by forklift trucks or roller conveyors.
While casting shakeout and cooling are not cleaning room functions, they can be important to overall cleaning room operations because the length of cooling time and method of shakeout can play an integral part in overall cleaning cost and efficiency.
In addition to the benefits provided by an efficient shakeout operation (see Part 10 of this series, modern casting, Oct 1989, p 45-47), other benefits are afforded in the finishing room.
Getting castings from shakeout to the cleaning room can be done several ways, the proper method depending on production rate, casting shape and size and the justifiable foundry cost.
Distance from shakeout to cleaning, casting sizes, cooling requirements and cost are the operative selection parameters.
In the sand foundry, this step in the metal-casting process is generally referred to as shakeout.
With an efficient shakeout, the mold is broken up, the castings and sand are separated, and mold lumps are reduced in size.
Ideally, a shakeout operation should accomplish the following:
Again, the ideal shakeout would accomplish each of these.