Forgiatura e Fonderia

Forge & Foundry, Part 2 – Efficient Recycling

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When a casting is produced, by-products are

generated. Small pieces originating from spills, gates, runners, and risers are

returned to the casting process as recycling material. To ensure a consistently

high overall quality of the raw material, it is essential that this recycling

material is perfectly clean without any sand, casting shell, or other residues

on the surface.


Subjecting these by-products to a blast cleaning process from Rosler Metal Finishing before they are re-melted offers many advantages. Besides the resource-saving use of raw materials, the effective cleaning of the recycling material increases the uptime of the smelting furnaces by significantly reducing the amount of unwanted slag.


Components made from steel, nodular cast iron, and

grey iron can be processed by mass finishing equipment.



Foundry Focused


To increase a company’s overall resource

efficiency, the spills, gates, runners, and risers are often separated from the

castings at the shakeout station and recycled into the casting process. Prior

to re-melting, the contaminants consisting of residual sand and casting scale

must be completely removed from the recycling material.


One key factor in selecting the best shot blasting

machine for your purposes is to consider the cleanliness produced by various

models. Expert shot blasting companies can specially adapt equipment to your




Using special heat-resistant materials for various

components including transport belts, plastic components, and electronic

components allows continuous operation without having to wait for the recycling

material to cool down. Special vents in the blasting drum dissipate heat

carried into the drum with recycling material and prevent excessive heat



Large inspection platforms accessible by stairs is

also an added feature of many shot blasting machines used for forge and foundry

processes. For quick mounting/dismounting of the turbine and blasting drum, machines

can be equipped with dedicated gantry or jib cranes. Both ensure easy and quick

maintenance and improve the overall uptime of the blast machine


Efficiency and Uptime


Additional turbine throwing blades and the use of

wear lining on blades made from solid tool steel can increase the productivity

of turbine blades while improving blade longevity. The shape of individual

blades can also increase productivity.


Rosler’s Gamma high-performance turbines feature throwing blades curved in the special “Y” design. Compared to conventional blast turbines the curved blades produce an up to 20 percent higher blast performance with, at the same time, lower energy consumption. Since both blade sides can be utilized, a simple turn of the blades practically doubles the expected life of the throwing blades. This is easily done with the help of a retaining bolt system and does not require disassembling the turbine.


0ur 400 Gamma G blades can be turned in less than 4 minutes. See for yourself in a video demonstration below or take a virtual, 360-degree tour.


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Automated Operation


Systems for transporting, collecting, weighing,

and processing recycling materials can automate systems.


Conveyor belts can be added to transport recycling

material from the shakeout station to an impact crusher where the spills,

gates, runners, and risers are crushed into smaller pieces. These can then be

transferred to the fully automatic multi-tumbler loading station equipped with

weighing cells. Once the preset weight in the loading station is reached, the

conveyor belt stops and the loading system transfers recycled material into the

blasting drum. Upon completion of the loading cycle, the system returns to its

base position.



Alternatively, the loading system can receive the

work pieces in a variety of different part bins as part of a double-acting

loading system.


During the shot blast cycle, the drum is

hermetically sealed with a lid. This prevents any blast media from spilling into

the immediate environment. While the drum rotates, the turbine throws blast

media onto the recycling material. The rotational speed of the drum and the

turbine can be easily adjusted with frequency inverters.


In combination with the multi-tumbling movement of

the recycling material in the drum, blast media throwing quantity adapted to

the batch size ensures that all pieces are equally exposed for complete and

reliable removal of contaminants. Resulting scale and sand are discharged from

the drum through a dust collector.


Blast media is removed from the drum through custom-engineered

screen inserts. Depending on the batch size and the density of the recycling

material, the processing time can vary from a few to 10 minutes. At the

conclusion of the blasting cycle the drum tilts into unload position. The shot

blasted material is dumped onto a vibratory conveyor for transportation.


The Rosler Way


The shot blasting process not only contributes to

a greatly improved quality of the castings, but because practically no residual

contaminants in the form of scale and sand are carried back into the casting

process, less slag is formed in the smelting furnaces. This reduces wear on the

refractory furnace lining and energy consumption while improving uptime.


Whatever process you have, Rosler Metal Finishing can learn about your challenges to develop and deliver a solution for forge shot blasting. Contact us today to discuss your unique challenges.



The complete Forge & Foundry Series includes:



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