Postpress metal processing classification

After the metal substrate is printed, it must be subjected to a molding process. After the molding process, the metal substrate is divided into:

1. Stamping. Metal packaging containers, whether they are boxes or cans, are mostly formed using the principle of metal stamping and are formed after two major processes of fire and plastic deformation.

The separate process is a stamping method in which stamping parts and sheet materials are separated from each other along the requested contour line and a positive section quality is obtained. Separate processes often include operations such as cutting, blanking, punching, cutting, trimming, and cutting.

The plastic deformation process is a stamping process in which the stamping blank is shaped and denatured without damage to obtain the required shape and dimensional accuracy. There are usually three types of tortuosity, stretching and forming. The twists and turns include bending, curling, curling, bending, rolling, bending, bending, bending and other operations; the stretching is important in deep drawing and thinning and deep drawing; there are many forming methods, including turning holes, flanging, and flares. Shrinking, forming, crimping, bulging, spinning, shaping, proofreading and other operations.

2. Can making process. The traditional manufacturing method of metal packaging cans is: first, the metal blanks are cut into cubes, and then the blanks are

The material is rolled into a cylinder (ie, a cylinder) and the resulting longitudinal bond wire is soldered to create a side seal. One end of the cylinder (ie, the bottom of the can) and the round end cap mechanically cause the flange to roll Press the seal (this is the double crimp seam) to create the can body; at the other end, close the can lid after loading the product. Because the container is composed of three parts: the bottom of the tank, the body of the tank, and the lid of the tank, it is called a three-piece tank. This type of can making method has been largely unchanged for more than 150 years. It is only a major advancement in the level of automation and processing accuracy. In recent years, the welding of side sealing has been replaced by welding.

In the early 70s, a new canning principle emerged. In accordance with this principle, the can body and the bottom of the can is a single body, which is stamped and formed from a circular blank. After the product is sealed, it is a two-piece can. There are two types of molding methods for such cans: stamping-thinning-stretching (ie drawing-drawing) and punching-re-punching (ie deep-drawing). These techniques are not new themselves. The pull-and-punch method was used to make shells as early as World War I. The difference between canning is the use of ultra-thin metals and the high rate of consumption (the annual output can reach hundreds of millions).

(1) Manufacture of three-piece cans. The manufacturing process is: the use of a shear machine to cut the rectangular sheet of the coiled material; painting and mounting printing; cutting the growth of billet; rolling into a cylinder and welding the side seam; repair the joint and coating; cutting the cylinder; Slots or corrugations; flanges pushed out at both ends; rolling back; test and yards on pallets.

1 cylinder processing. The crux process is curl forming and welding side seams. Side sealing methods are soldering, welding and bonding three.

Solder tin solders are individually composed of 98% lead and 2% tin. The cylinder manufacturing machine that rolls the flat blank into a cylinder is used in conjunction with a side seam sealing machine that performs soldering. In the cylinder maker, the edges of the slab are cleaned and bent into a hook shape, which facilitates fixation when the cylinder is created. The barrel then passes through the side sealer, plus the solvent and solder, preheats the sealing area with a gas torch, passes through a longitudinal soldering roller, and further heats the solder to fill the seams. After that, the rotating scraper rolls the excess in an important drop-like form. The solder eliminates cleaning.