Deep drawing, also known as drawing, rolling, etc., is a mechanical processing process that uses a mold to punch a certain shaped flat blank into various open hollow parts or reduce the diameter and increase the height of the open hollow blank. Through this process, thin-walled parts with cylindrical, stepped, conical, spherical, box shaped, and other irregular shapes can be manufactured. When used in conjunction with other stamping processes such as flanging, bulging, expanding, and shrinking, the deep drawing process can also produce parts with more complex shapes.
The main deformation process of deep drawing occurs in the flange part, which is essentially the plastic deformation of the material at the flange under the action of radial tensile stress and tangential compressive stress, and the flange continuously shrinks and transforms into the cylinder wall. In order to prevent material wrinkling during the deep drawing process, the pressure of the pressure ring is often used to press down on the flange part of the material.
Deep drawing technology is widely used in building shells, automobiles, instruments, light industry, and civil products. For example, car bodies, fuel tanks, basins, cups, and boiler heads are common deep drawn parts. Deep drawing equipment mainly includes various types of deep drawing machines, such as single action drawing machines, double action drawing machines, multi axis linkage drawing devices, etc. These devices have their own characteristics and can be selected and used according to specific needs.
Deep drawing technology has the advantages of high production efficiency, low material consumption, high part strength and stiffness, and high processing accuracy, and is one of the basic processes of cold stamping.
Deep drawing technology is widely used in container manufacturing, with many significant characteristics and advantages.
In the field of food containers, such as cans and canned food, deep drawing technology can ensure the sealing and safety of containers. The shape of the can body after deep drawing is regular, with smooth edges, effectively preventing food leakage and external pollution.
For chemical containers, deep drawing can produce tank bodies with strong corrosion resistance and high strength. For example, for barrels storing chemical liquids, deep drawing technology can ensure uniform thickness of container walls, enhance their compressive and corrosion resistance.
In daily necessities, large containers such as buckets and trash cans often use deep drawing technology. The container made by deep drawing has good structural stability and durability.
The deep drawing process brings the following advantages to container manufacturing:
High precision molding: able to precisely control the size and shape of containers, meeting strict production standards.
Efficient mass production: suitable for large-scale manufacturing, improving production efficiency, and reducing costs.
Material performance optimization: During the deep drawing process, the microstructure of the material changes, which helps to improve the strength of the container.