Ricochet shot-blast machine
The development of this new shot-blasting machine is based on the so-called ricochet effect (French for bounce/rebound). The main idea behind this is that the residual energy of the rebounded abrasive is utilized. This reduces the energy consumption, since you can use fewer turbines with a lower performance. In addition, the process involves abrasive which moves past the workpiece and normally has no effects. Another advantage is a reduced wear in the shot-blasting machine.
The machine size depends on the volume/quantity and the weight of the workpieces to be blasted.
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Application areas of AGTOS Ricochet shot-blasting machine (type BR)
When developing the new system, the development engineers from AGTOS took into account important aspects for optimizing processes, which are daily used in many foundries.
For instance, many foundries apply abrasive-blasting twice, which involves relatively high energy and handling costs. The first abrasive-blasting only removes sandy deposits and allows examination. But in practice, the energy should be utilized for finish-blasting.
The handling costs are often very high because each time the parts are blasted they must be passed into the loader or to the hangers. After pre-blasting, the parts are usually deburred and sanded manually. The subsequent shot-blasting should only provide uniform appearance and in some cases prepare the parts for coating.
In order to simplify the process, the developers of AGTOS also consider the possibility of automatically blasting the parts, including the recycling material, after the vibrating conveyor. The advantage of this is that the recycling material will be clean and will therefore not affect the casting quality when being reused. In addition, a steel mill tumble blast machine often causes “blow defects”, which are increasingly unacceptable from the standpoint of the today’s quality requirements of end customers. Furthermore, you can avoid excessive blasting (“overblasting”). This is an important aspect in the quality control.
Overall, pre-blasting is possible with clearly lower energy consumption. The blow defects are avoided because there is no drum rotation in the circulating system.
The industrial process of the ricochet shot-blasting machine
Typically, the workpieces are placed on conveyor belts and transported through the machine without further manual intervention. Only after the shot blast treatment are the workpieces brought to the mostly manual grinding work areas.
The blasting process starts automatically. The workpieces are transported through the blasting chamber and are removed manually at the rear of the machine or transported further by conveyor belt.
The abrasive keeps circulating and is cleaned to allow continuous use. An abrasive dosing device is used to transport the cleaned abrasive from the storage hopper to the high performance turbines.
A fan unit creates the partial vacuum necessary to maintain dust-free operation of the shot-blasting-machine. The extracted air is cleaned with an on-site filtering facility.