Pure Silver Coin Billet Processing Technology Optimization Research

The article is mainly for the precious metal commemorative coinsblank cake production process line detailed description and analyzed toidentify the production of the precious metal commemorative coins blankcake production process optimization. Compared with the precious metalcommemorative coins for foreign countries on the quality of the product,there are still some gaps, mainly in two aspects: the product of singlepieces of weight control; prone to flooding point discoloration on thesurface quality of the product. By analyzing the silver commemorate coinblanks cake production process for these two defects, a targetedformulation of the two countermeasures:a) optimize the rolling process, to improve the thickness accuracy.With the technology now widely used in flat-roll rolling method forprocessing silver, certain specifications of the finished product, forexample, quality indicators: thickness2mm, tolerances±0.01mm, the adoption of new silver with a rolling process. Pass processing rate of15%-20%condition, close to the finished thickness of the last few timesrolling with small deformation rate (ε≤20%), the mill further pressure,but silver Practice has proved that the process cold-rolled silver belt slipflat, uniform thickness, the accuracy is very stable, fully in line thicknessprecision requirements of user processing. We believe that smallprocessing volume, multi-pass rolling to get the silver with thicknessuniformity, accuracy and stability of silver band, from a cost point ofview, eliminating the need for new equipment using the technology,without increasing the cost of production, and operation is simple.b) Additional blank cake washing process to improve the blank cakesurface cleanliness.Through the light ornaments process, to clear blank surface a smallamount of oil cake, remove the burr and improve the surface finish of theblank cake. Satisfying the performance parameters. Production practicesalso found that: With the increase in the amount of cleaning agent, thesurface to improve the quality polisher time to improve the surfacequality is also helpful, but the barrel the higher the load, the surfacequality has declined markedly; hardness and diameter outside expansion,the amount of cleaning agents almost no impact, but the barrel load andlight decoration time significantly affect these two parameters, which isdue with the increased loading and cleaning time lengthened between the blank cake, billet fierce collision between the cake and ball blanks thehardness of the cake, and cake diameter billet expansion, up (crust pie bythe collision variable flat change).