In-depth analysis of stainless steel sheet metal stamping industry knowledge

Stainless steel sheet metal stamping is the core process system in the field of modern metal precision processing. It relies on punches, special molds and precision CNC equipment to apply controllable external forces to stainless steel plates, causing the material to separate or plastically deform, thereby obtaining sheet metal parts with preset sizes, structures and precision. This process system adapts to the needs of large-volume, high-precision, and complex metal forming. It is also the core technical support for the mass production of stainless steel sheet metal products. It is widely used in mainstream manufacturing fields such as industrial equipment, architectural decoration, medical food, and rail transit. According to the division of forming principles and process attributes, the stainless steel stamping process can be classified overall into two core systems: the separation process and the forming process. The two types of processes can be freely combined and matched according to the complexity of the product structure to maximize the adaptation to the production standards of different workpieces. Among them, Stainless Steel Stamping, as an industry-standardized processing method, has become the core process choice for stainless steel sheet metal mass production due to its stable forming accuracy and material adaptability.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stainless steel is not a single metal material, but a series of alloy steels that use iron as a base and add alloy elements such as chromium, nickel, molybdenum, and titanium. Its core characteristic is that the chromium content is not less than 10.5%. After chromium comes into contact with oxygen, an extremely thin, dense and strong chromium oxide passivation film is formed on the surface of the alloy. This film can effectively isolate the internal metal from contact with external corrosive media (such as water, oxygen, acid and alkali substances), thereby achieving "stainless" and corrosion-resistant functions. According to the different internal crystal structures, stainless steel can be divided into several categories such as austenitic, ferrite, martensite and duplex stainless steel. Among them, austenitic stainless steel (such as 304 and 316 grades) has become the most commonly used material in the Stainless Steel Stamping process due to its good comprehensive mechanical properties, excellent corrosion resistance and excellent processing and forming capabilities. Its face-centered cubic crystal structure provides a rich slip system, allowing the material to withstand large plastic deformation without cracking during the stamping and stretching process. Austenitic stainless steel is non-magnetic in the cold working state, but as the amount of deformation increases, martensitic transformation will be induced, resulting in weak magnetism.

 

This characteristic needs to be paid attention to in some applications that have strict magnetic requirements (such as medical electronic equipment housings). Ferritic stainless steel (such as 430 grade) contains no nickel or very low nickel content, is relatively low-cost, and has strong magnetism. It is suitable for application scenarios that do not require high corrosion resistance but are cost-sensitive. When performing sheet metal stamping processing, stainless steel has higher strength and toughness than ordinary carbon steel - the tensile strength of 304 stainless steel is about 520-720MPa, while ordinary low-carbon steel is only 300-450MPa. This means that stamping stainless steel requires greater forming force, which places higher requirements on the strength, hardness and wear resistance of the mold. At the same time, stainless steel has a significant tendency to work harden. During the stamping deformation process, the hardness and strength of the material will increase rapidly as the amount of deformation increases, and the plasticity will decrease accordingly. This feature requires a reasonable arrangement of intermediate annealing processes to restore the plasticity of the material in multi-pass stretching or complex forming processes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The stainless steel sheet metal stamping process can be systematically divided into two categories: the separation process and the forming process according to the stress state and deformation properties of the material. The purpose of the separation process is to separate one part of the stainless steel plate from another part along a certain contour line to obtain the required shape and size. The most typical one is the punching process - using a punching machine and a punching die to apply shearing force to the stainless steel plate, causing the material to break and separate along the predetermined contour. The blanking process includes two basic actions: blanking (punching a blank of the required shape from the plate) and punching (punching a hole of the required shape on the plate). In the production of Stamping Sheet Metal Parts, the section quality of the blanking process is an important indicator to measure the level of technology. It is usually required that the bright strip accounts for more than 1/2 of the entire section and the burr height does not exceed 5-8% of the material thickness.

 

The shearing process is another separation method. The upper and lower scissors of the shearing machine apply shearing force to the stainless steel plate to cut it to the required length and width. Cold shearing is performed at room temperature and is suitable for stainless steel plates with a thickness of no more than 6mm; hot shearing heats the material before cutting and is suitable for thick plates or occasions that require high incision quality. Laser cutting has accounted for an increasing share of the separation process in recent years. It irradiates the surface of stainless steel with a high-energy-density laser beam to quickly melt or vaporize the material and assists high-pressure gas to blow away the slag, thereby obtaining smooth, burr-free cuts with minimal heat-affected zones. It is especially suitable for processing modes with complex contours and small batches and multiple varieties. The purpose of the forming process is to plastically deform the stainless steel sheet and change its shape and size without destroying the continuity of the material.

 

Bending is to bend the stainless steel plate along a straight line, which requires precise control of the bending angle and springback compensation - the springback angle of stainless steel is usually 1-3° larger than that of ordinary carbon steel, so an over-bending amount needs to be reserved during mold design. Drawing (or deep drawing) is a process that uses a punch to press a stainless steel flat blank into a concave mold cavity to turn it into an open hollow part. It is suitable for manufacturing cup-shaped, box-shaped, and cylindrical parts. The bulging process completely relies on the elongation of the material itself. Under the condition that the blank holder is pressed to death around the blank, the punch or liquid pressure is used to force the thickness of the blank to become thinner and the surface area to increase, forming local convex or concave features. Flanging is the use a mold to turn the outer edge of a prefabricated hole or blank into an upright straight edge. It is often combined with the punching and stretching processes and is completed continuously in the same set of progressive dies.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stainless steel sheet metal stamping parts play a key role in many industrial fields due to their excellent corrosion resistance, high strength and good surface quality. In the field of electronics and electrical appliances, Custom Metal Stamp for Steel is used to manufacture structural parts of server cabinets, casings of power modules, conductive terminals in switch sockets, and fixed brackets for radiators. These applications have high requirements for dimensional accuracy and surface quality. The thickness is usually between 0.5 and 1.5 mm. Precision blanking and CNC bending processes are used. Progressive die production is used when the batch size is large. In the field of medical devices, 304 or 316L stainless steel stamping parts are widely used in components of surgical instruments, inner liner of sterilization equipment, structural parts of medical carts and casings of diagnostic instruments, because the stainless steel surface is easy to clean and disinfect, does not breed bacteria and is resistant to corrosion by disinfectants.

 

This type of product has extremely strict requirements on surface finish and burr-freeness, and electrolytic polishing and passivation treatment are usually required after stamping. In the food and beverage industry, stainless steel stampings are used to manufacture countertops, sinks, locker door panels for commercial kitchens, and hoppers and pipe connections for food processing equipment. Such parts usually require deep drawing (such as sinks) or large-area bending (such as countertops), which have high requirements on the material's elongation and welding performance. In the field of architectural decoration, stainless steel stamping parts appear in the form of interior decorative panels for elevator cars, apron panels for escalators, connectors for building curtain walls, and decorative covers for indoor and outdoor railings. The technology focuses more on surface treatment effects (such as drawing, mirror polishing, embossing) and special-shaped forming capabilities.

 

The application of Stamping Sheet Metal Parts in this field often involves Custom Metal Embossing Stamp - a regular concave and convex texture is pressed on the stainless steel surface through an embossing die, which not only increases the decoration but also improves the surface's scratch resistance. In the automotive industry, stainless steel stamping parts are used for exhaust pipe heat shields, muffler casings, fuel system brackets and decorative strips in interiors, requiring good high-temperature oxidation resistance and vibration fatigue resistance. These parts are often complex in shape and require a combination of multi-pass drawing and flanging processes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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