New process for manufacturing steel drum closures abroad Nanjing Yangzi Barrel Factory Zhang Lianyuan When the plant was working on a closure on a 200-liter steel drum produced in Italy in 1991, the closure was printed with the Tri-Sure mark. It has been found that the manufacturing process of the spiral ring has been greatly improved and has been developed to thinness, see the attached drawings. The shape of the coil is basically the same as that of the Qingdao Huarui Co., Ltd., but the manufacturing process and structure are different. The traditional manufacturing of the spiral ring process is blanking and drawing, shaping and punching, trimming, turning, and tapping. The new technology of Tri-Sure spiral ring is blanking, shaping, punching, octagonal, flattening, turning, and tapping. The main difference is in the production of the octagonal side. The balance of the traditional process materials is large, and the octagonal shape is punched out after the plastic punching, and the new process eliminates the process margin of the punched octagonal shape. In the blanking and shaping of the blanking, a rounded edge close to the slanting octagonal dimension S is prepared for the subsequent extrusion of the octagon. When the octagonal shape is pressed, under the action of the extrusion die, the material of the bottom edge of the coil moves in the direction of the pressing force toward the octagonal die until an octagonal shape is formed. After extrusion, since the thickness of the octagonal side is very thin, the density of materials varies from place to place, and the stress is redistributed, causing deformation at the octagonal side. In order to solve the deformation problem, it is necessary to go through the leveling before it is possible to turn the coil into the turning and tapping process. There are many manufacturers who purchase Tri-Sure patents abroad. The size of the produced closures is slightly different. The spirals with a thickness of 3mm on the octagonal side can be processed into the next processing without flattening. Due to the new process of manufacturing the coil, the trimming process is eliminated, and the size of the blank loop blanking process is significantly reduced, thereby greatly improving the material utilization rate. Due to the cold work hardening of the extrusion, the mechanical strength of the octagonal side of the spiral ring is improved, and the strength of the octagonal side of the spiral ring is thinned. It can be seen from the figure that the thinnest part of the octagonal side of the coil produced by the new process is only 2.2mm, which is thinner than the thickness of the coil produced in China by 1.1mmo. The octagonal side of the spiral ring is evenly distributed with eight prismatic grooves. In the direction of the octagonal, it does not affect the strength of the octagonal side and the root of the coil, and does not affect the performance of the closed collar. China's annual output of steel drum seals is about 15 million sets. If all the coils are produced according to foreign new technology, it is estimated that steel can be saved by 1000 tons per year. Tri-Suer closure coil diagram
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