Shot Blasting Machine Manufacturer, Suppliers, Exporter

Shot Blasting Machine

Shot Blasting Machine is a surface treatment process using shots of high-velocity steel abrasive. Shot blasting is a method through which it is possible to obtain excellent cleaning and surface preparation for secondary finishing operations.

In general shot blasting concentrates abrasive particles at high speed (200-350 km/second) in a controlled manner at the material thereby removing surface contaminates due to the abrasive impact. The shot blasting process is used for compressed air for propelling the steel shot. This method is used for cleaning metal frames and welded elements. Shot blast production lines use manual and automated systems became possible with the introduction of centrifugal wheel blast machines.

When it comes to finishing and cleaning operations, the shot blasting surface treatment techniques is a highly effective option. The high speed controlled shot blast creates an abrasive impact that removes surface contaminants, thereby making it an effective method for cleaning iron, steel, forgings, machined parts, fixtures, etc..

Shot Blasting Machine is commonly used for:

• The cleaning of iron, steel, corrosive, non-cast parts, forgings, etc.

• Mechanical cleaning of sheets, rods, wire, coils, etc.

• Shot peening to alter mechanical properties (increasing resistance, longevity to fatigue for springs, gears, etc.)

• Preparing surfaces to be anti-corrosive, painted, coated, etc.

There are 2 ways of accelerating the steel shot:

A) By compressed air:

This system is suitable for lower production applications with maximum flexibility is needed. These systems are very flexible in which the shot can be delivered horizontally through a rubber hose and nozzle assembly. This enables uses in finishing operations of steel frames and weld elements thereby replacing hand tools. Because of this, an air blasting machine is expensive for the production line compared to the centrifugal wheel blasting machine.

B) By centrifugal turbine: Centrifugal wheel blasting is the conventionally blast cleaning technique as well as the most economical and environmentally friendly method. The turbine delivers abrasive shot by centrifugal force in a specified and controlled direction, speed, and quantity. The function of the turbine is similar to that of a fan or centrifugal pump. Shot blasting machines may use one of the turbines positioned in such a way that the abrasive blast pattern covers the entire surface of the material to be shot cleaned. The power of the turbine motor is based on the degree of cleaning needed and throughout the speed of the material.

Abrasive Recovery and cleaning system

Recirculation and cleaning of the abrasive shot are required to maintain a consistent cleaning operation. In conventional shot blasting equipment after the shot hits the part the abrasive falls into the collection hopper under the machine.

The shot is then carried by gravity or screw conveyor force to a bucket elevator. The elevator carries the shot, removed oxides and other contaminates to an air wash separator located in the upper portion of the machine. A combination of baffles, strainers, and plates are separated by these contaminates which are ineffective during the shot blast operation. The cleaned abrasive is contained in an upper feeding-box and is subsequently fed into the shot turbine by gravitational force.

The re-circulating and cleaning capacity of the abrasive in each machine is related to the shot blasting power used for the turbines. An incorrectly sized system will cause premature wear and tear to the machine and decrease overall shot blasting effectiveness and shot consumption.

Shot Blasting Cabinet

The machine cabinet contains dust and abrasive. A machine mounted dust collector, reduces air pressure inside the machine thereby preventing dust from escaping into the shop environment. Material access opening in the entrance and exit of the shot blaster must be designed and protected to prevent abrasive spillages. Cabinets are built from low carbon steel with an inner shell made of abrasive resistive materials including high strength alloy plates and thick rubber compounds. In the areas that are subject to direct high-velocity shot, alloy steel plates are used which have much more abrasive resistance than other more commonly used materials like manganese steel.

Shot Blasting Dust collector system

Dust produced during shot blasting is withdrawn from the machinery cabinet and continuously re-circulating abrasive by a dust collector. Typical dust collector design uses a baffle filter or cartridge. The dust collector not only avoids dust within the machine but also keeps the surrounding area clean and dust-free. Changes in airflow will reduce collector efficiency and therefore results in lower dust extraction, loss of the cleaning power, and contribute to dust in the immediate production areas. A properly designed and utilized dust collector is therefore critical to the ongoing performance of the shot blasting system.