Rösler 's newly designed Rösler Multi Tumbler (RMT) rotating shot-blasting machine combines new, intelligent design details alongside proven components. To be unveiled at MACH 2014, the unique design produces superior shot-blast results, says the company (Stand 5791, Hall 5).
The innovative RMT ensures total batch integrity and high levels of process safety for the shot-blasting of mass produced components weighing from just a few grams to 60 kg or more.
Available in different versions and sizes, the compact RMT machines do not require a foundation pit. Components with sizes as small as 2.5 mm can be processed and batch integrity maintained in this machine type.
RMT machines of larger sizes are additionally suitable for batch processing of single large work pieces with sizes up to 600 mm and piece weights of 60 kg or more. This is especially advantageous for parts with complex shapes and inner contours, where spinner hanger or wire mesh belt machines might not reach all surface areas.
Depending on the machine size and the processing objectives - general blast cleaning, de-sanding, sand core removal, deburring, paint preparation, up to commercial shot peening and decorative blasting – RMT units can be equipped with either one or two turbines. Alternatively, they can also be supplied with compressed air blast systems.
Treatment in batches produced by casting, forging, heat treatment, removing scale, profiling or stamping can often pose special technical challenges.
Key considerations are the prevention of components from becoming lodged (and, potentially, damaged), uneven exposure to the blast, together with the risk of parts being retained in the chamber, after the shot blast process. Additionally, intensive, yet gentle, cascading of the components is required to achieve optimum process results in short cycle times.
The RMT machines fulfil all these requirements via: a claimed unique rotary barrel design that creates a three-dimensional cascading action to produce optimum blast coverage; no pinch or trap points, making them superior to conventional tumble blast machines; a simple design that has very few moving parts, ensuring maximum uptime and reduced maintenance costs; modular construction guarantees easy access and replacement of wear parts when maintenance is required; batch integrity is ensured on every load processed; a rotary barrel is made of tough, wear-resistant manganese steel; systems can support capacities from 70 l (170 kg) to 1.250 l.(4,000 kg); Rösler 's wide range of available blast turbines range in drive power from 7.5 to 37 kW; automation is easy with a wide range of optional features, taking in loading/unloading equipment, shot-blast media replenishing systems, shot-blast media classification options.
A key feature of the RMT concept is the innovative geometry of the rotary cascade barrel. The inside of the barrel wall features specially contoured ridges, while the bottom is shaped in the form of a three-sided pyramid. Apart from the fact that the barrel has no gaps whatsoever, this design produces the special multi tumbling effect. The ridges in the barrel wall cause the components to cascade, tumble and mix, while the pyramid in the barrel bottom directs components to the top of the mass for ideal exposure to the blast media. This design guarantees problem-free shot-blasting of extremely flat, either small or larger items without any lodging or damage to the components.
During the shot blasting process the barrel is totally seal/closed via a lid preventing any blast media spillage or escape. The optimum placement of the blast turbine on the barrel lid ensures complete coverage of the component batch by the blast stream for absolutely homogeneous and repeatable blast results. The raw parts are placed into the tumbling barrel with a hydraulic loader that tilts by 160° for complete unloading of the parts from the transport bin. After processing, off-loading takes place onto a Vibro deck conveyor placed between machine and loader.
MACH 2014 - Birmingham NEC, 7-11 April