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Free abrasive surface finishing includes swirling, centrifugal, fork shaft, horizontal four series, and more than a dozen models and the corresponding abrasive grinding materials, after hundreds of mechanical parts of the finishing and light The craft test research of the decoration has achieved good results. Has achieved better economic and social benefits.
Free Grinding and Finishing Precautions The practical process of barrel finishing is:
Degreasing → finishing and deburring → sorting → cleaning → drying → anti-rust treatment
* Degreasing treatment: The parts before finishing should be thoroughly deoiled, and the ultrasonic cleaning method is often most effective. If the oil on the workpiece enters, the cutting force of the grinding block is obviously weakened, the effect of the grinding agent will be reduced, the effect of the finishing and the efficiency will be reduced, and the surface of the part after finishing will not be bright.
* Finishing: Finishing is mainly based on the structural shape, size, and finishing requirements of the finished part, or the selection of equipment form, equipment specifications, process materials, and process parameters.
* Finishing processing includes three aspects: sorting of grinding blocks and workpieces, cleaning of grinding blocks and workpieces, and dehydration and rust prevention of workpieces.
The common methods for separation of grinding blocks and workpieces are: manual screening, mechanical screening, vibration screening, manual electromagnetic separation, and conveyor magnetic separation, which can be selected according to actual conditions. Ultrasonic cleaning is the best method for cleaning blocks and workpieces. Rinse with clean water. Pay special attention to the dehydration, drying, and rust prevention of the workpiece.
A large number of process tests have found that the surface of the workpiece after barrel finishing is bright and bright, and the active metal molecules on the surface are exposed to the air and quickly oxidized and darkened, followed by rusting, and the water film remained on the surface of the components after cleaning. A layer of electrolyte solution is necessary for electrochemical corrosion. Although the degree of ionization of water is small, it can still be ionized into H+ and [OH]-. This ionization process increases with temperature. At the same time, CO2, SO2, etc. are dissolved in water, and they are easily combined with water.
H2O→H++[OH]-
CO2+H2O→H2CO3→H++[HCO3]-
Impurities in iron and iron are soaked in solutions containing H+, [OH]-, and [HCO3]- and other ions, forming a corrosive cell. Iron is the anode and impurities are the cathode. Under normal circumstances, the water film contains oxygen. The iron on the anode is oxidized to Fe2+ ions. The electrons on the anode are oxygen, and then combine with water to form [OH]- ions. The corrosion reaction is:
2Fe+O2+2H2O=2Fe(OH)2
From this point of view, it is necessary to perform degreasing treatment and rust-proofing treatment before finishing and after finishing, both are indispensable and many methods are available. Dehydration and drying usually use industrial type dryers. The main components of anti-rust oil are lanolin, petroleum sulfonate, petroleum sulfonate and additives.
Free abrasive surface finishing technology
Each piece of mechanical parts put into mechanical processing has deburring technical requirements, deburring process, craftsmen often can not compile process files, usually using boring knife, cloth wheels, abrasive cloth, belts and other methods to remove burrs. With the advancement of science and technology and the development of production, artificial deburring has been unable to meet the requirements of product quality and production methods that the modern market competes with. The finishing technology has gradually replaced the traditional deburring process, and is increasingly being used by people. It is important to note that at present, the finishing and finishing of mechanical parts of some advanced companies have been compiled by technicians into the technical requirements of the drawings, and standard processes have been formed.