Optimization of technological modes of shot-streaming before repairing of details of food machines by plasma spraying
Shot blasting refers to abrasive blasting, mechanical surface treatment processes for removing various contaminants and give an optimal surface roughness in terms of the depth of the depression (imprint). To assess the impact of the development (roughness) of the surface by plasma spraying is used the analytical expression of the activation energy, which should have the surface layers to maximize the adhesive strength of the sprayed wear resistant coating to the base part. This treatment is carried out with compressed air, that captures a fraction (grit) and moves towards the surface under prepare plasma deposition of a protective coating of particulate material (powder). Optimization of technological modes of processing the distance; size fraction; the pressure in the pneumatic system; processing time and processing angle, allows to obtain a developed surface, which allows to ensure high durability of the plasma coating adhesion to the base metal, which provides improved durability and performance of worn parts of food machine. The results obtained single-factor experiment, which formed the basis of full factorial experiment with the development of a mathematical model in the form of a regression equation significance above mentioned technological regimes and their impact on the optimization of the output parameter - the depth of indentation. Choosing the optimal values of technological regimes blasting obtain a rational outcome in terms of the depth of the depression, which guarantees maximum grip strength of the applied plasma coating on the worn surface of food machinery parts.