One, sheet metal cutting blank
Modern manufacturing methods for tinplate drink cans are generally divided into two pieces of stretch and wall irons. The process starts from the sheet metal and the thickness is generally 0,23mm. The first step in actually making the can is to cut the sheet into a circle, called a blank, which will form the bottom and sides of the can. Diameter of each blank (according to mold size); Material loss is inevitable; Because of the loss of sheet metal between each circle, the manufacturer found that, when the sheet metal was wide enough, it could accommodate two interleaving rows, each with seven blanks, with minimal material loss. About 10-15% of the material is wasted, but can be reused as waste. Cut the circle blank and put it in. Pull & throughout; Or & other Pull & throughout; To form a cup with a specified diameter (e.g. 6.6cm).
Transfer the original cup to the second machine. The sleeve holds the cup precisely in place and then rapidly drops the punch into the cup to pull it back to a diameter of about 6.6mm. The height of the cup was also increased from the original 3.3cm to 5.6cm. The punch then pushes the cup into three rings, called ironing rings, which stretch and thin the wall. The whole operation - drawing and ironing - is completed in one continuous punch stroke, which takes only a few minutes to complete. Now the cup is about 13cm high. Then, another punch presses on the bottom of the cup to make the bottom protrude inwards. This shape cancels out the pressure of the carbonated liquid in the jar. The bottom wall and bottom wall of the tank are also slightly thicker than the top wall to increase strength.
3. The top of the can is slightly undulating during stretching and ironing. These little ripples in the metal are called ldQuo; Ear & throughout; . & other; Ear & throughout; It is the inevitable influence of the crystal structure of the iron sheet. This phenomenon has been extensively studied by tin box manufacturers, who have been able to influence the position and height of ears by controlling the rolling of tin plates. However, some material is lost at this stage. Cut about a quarter of an inch from the top of the can so that the upper wall is straight and level.
The drawing and ironing process makes the outer surface of the tank smooth and shiny without further processing such as polishing. After you trim your ears, clean the cans and then label them. After decorating the can, squeeze the top of the can into the neck, then protrude the top edge of the can and fold it up once the lid is added.
The lid is made of the same material as the bottom and sides of the tank. The bottom of the tank protrudes inwards to help the tank withstand the pressure of the internal fluid, and the base is solid. The center of the cover is drawn slightly upward and mechanically drawn to form rivets. The puller is a single piece of metal inserted under the rivet and held in place by it. To make sure the cans are made correctly, they are automatically checked for cracks and pinholes. Typically, several out of every 10,000 cans are defective.
After forming the neck, can be filled. The can is pressed against the seat of the filling machine and the drink is poured. Build. Then, bend and sew the top flange formed when the can is removed on the cover. To this, the; The drink can is done.