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Application principle of steel plate shot blasting machine

With the development of the steel plate application industry, people’s requirements for anti-corrosion performance are increasing. The shot blasting pretreatment of steel plates has been paid more and more attention. The steel plates treated by cold or hot rolling processes generally have oxide scales on the surface during long-term storage. Rust, grease, and other impurities are present and must be removed before painting. Good shot blasting on the surface can ensure a permanent combination with the coating system so that the protected steel plate can be protected for a long time. The shot blasting pretreatment process can also increase the surface roughness, increase the contact area between the coating and the steel plate, and the coating and the quilt. The cohesion of painted objects.

A shot blasting machine refers to a kind of equipment that throws abrasive at high speed by centrifugal force to clean steel or strengthen the surface of the workpiece. The working principle of the shot blasting machine: The shot blasting machine is not powered by compressed air, but powered by an electric mechanical shot blasting machine. A device that uses high-speed abrasive thrown by a blast turbine to clean or strengthen the surface of metal workpieces. The shot blasting machine can clean all kinds of residues on the surface of metal workpieces, and can clean steel plates, steel structures and sheet metal welding workpieces. Shot blasting relies on the high-speed rotation of the impeller. The abrasive in the center of the impeller is pre-accelerated by the flow regulating block and the impeller pusher and then sent to the blade area to throw the abrasive at high speed. The speed can exceed 80m/s. Large, so there is no need to use air pressure, and the energy efficiency is much higher than that of sandblasting. The impeller is the heart of the shot blasting machine. It is directly or indirectly driven by an electric motor. The shot blasting machine manufacturers have unique designs, which are mainly divided into a single disc and double disc impellers. The process is not limited by the size, shape, and weight of the workpiece to be cleaned. As small as screws and nuts, as large as train carriages and ship shells with 10,000 tons; as simple as a flat plate, as complex as the cooling water jacket of the engine cylinder; as light as a few grams, to a weight of one million tons, all can be cleaned by shot blasting.

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From a formal point of view, shots are projected on the surface of parts at a high speed by mechanical methods and are collectively referred to as shot blasting. It includes: projecting abrasive to castings with sand, removing the shot blasting sand of molding sand and core; projecting abrasive to casting, forging, welding and heat treatment parts to remove black skin, nodules, oxide films, and rust spots Surface cleaning; projecting abrasive to the surface of steel plates and various shapes for shot blasting pretreatment; for parts such as springs, leaf springs and gears that are subjected to variable stress, shot blasting to eliminate stress and improve surface fatigue strength; The surface of decorative parts of household appliances or tableware is shot blasted to enhance the color. But in terms of process classification, shot blasting is limited to a cleaning process for the purpose of removing cast, forged, welded and heat-treated parts. The shot blasting referred to in this lecture is this concept. For those who use abrasive to project to the surface of the workpiece to achieve the relevant technical purposes, they are directly named after their technical requirements, such as: shot blasting, shot blasting, shot blasting, shot blasting, etc., which are different from shot blasting in the process.

When the parts are shot blasting, the equipment that can continuously replace the surface of the parts in the jet stream to achieve uniform shot blasting requirements is called shot blasting equipment, or shot blasting machinery. Because of the ever-changing parts to be cleared, Qingdao Machinery Co., Ltd. has a variety of shot blasting machines. Shot blasting equipment of a certain specification is only suitable for cleaning parts within a certain range. The special equipment is suitable for certain kinds of parts.

The principle of shot blasting is based on high-speed abrasive hitting the surface of the part, causing it to deform locally to produce projectile indentation. Each projectile indentation has three distinct structures. Namely: the brittle deformation layer on the surface of the part; the matrix plastic deformation zone in the middle layer of the part; the deep elastic deformation zone. These three effects almost simultaneously produce the following three effects after the projectile strikes: (1) Compressive stress is generated instantaneously from five directions on the front, back, left, and right, and upwards of the plastic zone of the middle layer; (2) The middle layer is compressed and deformed in five directions instantaneously, and instantly Push to the surface layer, so that the brittle layer that has the rupture line will quickly fall off; ③Almost at the same time, it pushes the projectile to produce a rebound force, so that it can rebound at a rebound speed. The three areas of projectile indentation occur and exist simultaneously.

In order for the brittle layer to be a brittle fracture, it must reach its brittle failure deformation. Therefore, if the appropriate indentation depth is required, there must be an appropriate amount of plastic deformation zone. There is an intermediate state of the elastic zone between the plastic zone and the matrix, and the thickness of the three varies with the purpose of shot blasting. Generally, shot blasting is only required to destroy the surface appendages and make them fall off. The less brittle matrix, the better. Therefore, the process parameters must be selected reasonably.

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