What is Bead Blasted?
Shot peening is a widely used cold processing method for material surface cleaning and treatment by spraying abrasive with high speed flow. It can remove the oxide, rust, sand and old paint film dirt, oxide layer and other substances on medium and large metal products with thickness of not less than 2mm or do not require to maintain accurate size and profile.
At the same time, it can improve the surface quality and enhance the wear resistance, so it is widely used in aviation, automobile, machinery manufacturing and other industries. Commonly used abrasives are steel sand, steel shot, stone, etc. Shot blasting methods can be divided into compressed air shot blasting, mechanical shot blasting, liquid jet and so on. Shot peening can improve the surface quality, wear resistance and dimensional accuracy of objects.
What is the principle of Bead Blasted?
The principle of shot peening is to use abrasive particles with high landing speed and good Angle to remove surface oxides, attachments and burrs by using the energy of abrasive impact and friction on the surface of the object, so as to achieve the purpose of improving the surface quality and wear resistance of the object.
Why is Bead Blasted called surface treatment?
The reason why shot peening is called surface treatment is because it can clean and treat the surface of an object. Surface treatment refers to various methods and measures taken to improve the surface state of an object. Shot peening can remove dirt, oxide and burr, etc., while also improving the quality and wear resistance of the surface of the object, so it is considered to be a very effective surface treatment method.
In which areas has Bead Blasted been applied?
Shot peening has been widely used in aviation, automobile, machinery manufacturing and other fields. In aviation, shot peening is used to remove oxides and oil stains from the surface of aircraft engine parts. In automobile manufacturing, shot peening can be used to clean burrs and oxides on the surface of automobile parts to improve surface quality and corrosion resistance. In mechanical manufacturing, shot peening can improve the wear resistance and dimensional accuracy of the surface of mechanical parts, and extend the service life of parts.
Process principle
Shot peening, also known as shot peening. It is in a fully controlled state, numerous small circular media called steel pellets are sprayed at high speed and continuously, and hammered to the surface of the part, thereby creating a residual compressive stress layer on the surface. Because when each steel shot hits the metal part, it’s like a miniature rod hitting the surface, making small indentations or depressions.
To make a dent, the surface of the metal must be stretched. Under the surface, the compressed grains attempt to restore the surface to its original shape, resulting in a hemisphere under high compression forces. Numerous depressions overlap to form a uniform layer of residual compressive stress. Finally, under the protection of the compressive stress layer, the parts greatly improve the fatigue strength and extend the safe working life.
The Bead Blasted process consists of the following steps
- Prepare the workpiece: First of all, clean and inspect the workpiece to ensure that the surface is free of oil stains, dirt and loose oxide layer.
- Preparation of abrasive: according to the material and surface requirements of the workpiece, the appropriate material is selected for preparation. Commonly used abrasives are aluminum sand, cast iron sand, steel wire and so on.
- Load the workpiece: Place the workpiece in the work room of the shot blasting equipment to ensure that the surface of the workpiece can be fully cleaned.
- Adjust the equipment parameters: according to the material and surface requirements of the workpiece, adjust the pressure, blasting Angle and blasting speed of the shot blasting equipment.
- Sand blasting cleaning: Start the shot blasting equipment and spray the material to the workpiece surface to achieve cleaning and coarsening treatment. At the same time, dust and abrasives are collected through the suction device to avoid environmental pollution.
- Surface treatment: According to the requirements of the workpiece, the surface can be further shot peening to increase its adhesion and corrosion resistance.
- Inspection and packaging: After cleaning, surface quality inspection is carried out, and then packaging is carried out to prevent external contamination again.
Precautions for Bead Blasted
Selection of shot blasting materials
The effect of shot blasting is closely related to the choice of materials, and different materials are suitable for different cleaning requirements. Common shot blasting materials include quartz sand, copper wire balls, steel balls, etc. When selecting the shot blasting material, it should be determined according to the material, surface state and cleaning requirements of the object to be cleaned. At the same time, attention should also be paid to the selection of shot peening materials produced by regular manufacturers to ensure the quality and stability of the materials.
Impact of construction environment
The effect of shot blasting is greatly affected by the construction environment, so some matters need to be paid attention to when selecting the construction environment. First of all, it is necessary to choose a well-ventilated construction site in order to timely eliminate harmful gases and dust generated during the shot blasting process. Secondly, it is necessary to avoid shot peening in a humid environment to avoid affecting the cleaning effect and the normal operation of the equipment. Finally, it is necessary to consider the protection of the surrounding environment to avoid environmental pollution caused by shot peening particles.
The quality requirements of the finished product in the shot blasting process mainly include the following aspects
- Surface topography: there shall be no scratches, pits, pits, cracks and other defects on the surface of the workpiece, and the surface shape and size shall meet the requirements of the drawing.
- surface roughness: the surface roughness of the workpiece, holes, cracks and other requirements are in line with the surface roughness standard.
- surface penetration: that is, the film thickness, the workpiece surface should have a certain thickness of the film to avoid damage to the smooth surface.
- surface corrosion resistance: under the conditions of changes in ambient temperature, humidity, wind speed or chemical gases, surface corrosion resistance needs to meet national standards
- Surface appearance: Ensure the surface finish of the workpiece, make the surface color of the workpiece consistent, avoid polluting the surface phenomenon.
Operating points
- According to the material and processing size of the workpiece to choose the appropriate shot blasting material and shot blasting wheel.
- Put the shot peening pieces into the corresponding container, lift the shot peening machine to the height of the container mouth, open the shot peening machine, adjust the voltage and adjust the force.
- Each shot peening action should be evenly dispersed to avoid exhaustion and too much reduction.
- After the completion of shot peening, timely clean off the shot peening noise, and the workpiece appearance inspection.
- Regular cleaning and maintenance of the shot peening machine to ensure that the equipment has good efficiency and service life.
- Pay attention to safety, ensure the safety of employees, prevent injury.
- Calibrate the shot peening machine regularly to ensure data accuracy.
