Mixed abrasive determines the cost of peening

The value of any abrasive is determined by the quantity, quality and expense of the workpiece processed per unit time (including abrasive, consumable and labor).
At present, some high hardness abrasives (iron pills, iron sands) on the market can also quickly clean (or strengthen), the abrasive price is also low, but these abrasive consumption is high & fragile, the shot blasting equipment wearing parts wear earlier (Replace the equipment wearing parts when the need to stop, increase maintenance costs), there is a very high operating costs and not be used, on the contrary, some other abrasives (such as low hardness abrasive), although there is a low consumption rate and low Price, they have a long cleaning cycle, low productivity, waste of labor and operating time, these abrasives can not be used.
In the shot blasting equipment, the abrasive particles are ejected from the high-speed rotating wheels (or air nozzles) at a very high speed, impacting the surface of the workpiece, completing the cleaning, strengthening the task, and the pellets impact the surface of the workpiece each time , The pellets themselves are subject to impact consumption, while the equipment caused by wear and tear, through continuous circulation and repeated shocks, from large particles into small particles, from small particles to smaller particles, and finally because the particles are too small (less than 0.2mm) And can not be used, cleared by dust removing system.
The wear rate of the components of the shot blasting equipment affects the maintenance costs, and the wear rate data of the parts can be quickly obtained by adding iron sand, ordinary steel cutting pill (super standard length, multi-bevel angle) or large proportion and steel ball mixing in the equipment , Directly reduce the parts life of 50% -80%.
The hardness of the abrasive affects the cleaning speed and quality, high hardness abrasive affects the cleaning speed, the resilience and the finish of the workpiece. Under normal circumstances, the ideal hardness of the abrasive range of HRC40-50, to break easily for hard, to deformation for soft. The size of the abrasive determines the cleaning quality (finish).
Mixed abrasive determines the cost of peening:
Steel shot work resistance is small, with the appropriate hardness, high resilience, cleanliness is high when continuous blasting the working surface, but not easy to throw out a certain degree of roughness, the requirements of the coating standard parts, surface roughness have a great impact on paint Membrane adhesion, corrosion resistance and protective life. The roughness of the workpiece surface is conducive to the improvement of the protective properties of the film, the roughness is too small, is not conducive to the improvement of the adhesion of the paint, roughness is too large, such as the amount of paint film is certain, it will cause the film thickness distribution Uneven, especially at the peak of the film thickness is insufficient and lower than the design requirements, causing early corrosion, in addition, the roughness is too large, but also often in the deeper trough pits to retain the bubble, will become the root of the film bubble .
For the commonly used coating, the appropriate roughness is range to 39-75um. So must be reasonable to use mixed abrasive, add steel grit appropriately. The specific proportion according to the coating standard requirements , so that both can quickly clean up (improve work efficiency) and can throw shot peening equipment wear to a minimum (control equipment maintenance costs) and effective to meet the coating requirements (to reduce paint waste) , Thus reducing the overall cost.