The influence of stamping material selection on stamping process

Stamping is a forming method that uses a press and a die to apply external force to plates, strips, pipes and profiles to cause plastic deformation or separation, thereby obtaining a workpiece (stamping part) of the required shape and size. Stamping and forging are both plastic processing (or pressure processing), collectively known as forging. The blanks for stamping are mainly hot-rolled and cold-rolled steel plates and strips. 60-70% of the steel in the world is sheet material, most of which is stamped into finished products. The body, chassis, fuel tank, radiator fins of automobiles, the shell of containers, the iron core silicon steel sheets of motors and electrical appliances are all stamped. There are also a large number of stamping parts in products such as instruments and meters, household appliances, bicycles, office machinery, and daily utensils. Our new energy Stamping Copper Sheet can be used in various aspects and can be customized in different sizes and models according to customer requirements.

The materials used for stamping should not only meet the technical requirements of the design, but also meet the requirements of the stamping process and the requirements after stamping (such as cutting, electroplating, welding, etc.). The basic requirements of the stamping process for materials are mainly:
(1) Requirements for stamping forming performance: For the forming process, in order to facilitate stamping deformation and improve the quality of the product, the material should have good plasticity, small yield strength ratio, large plate thickness directional coefficient, small plate plane directional coefficient, and a small ratio of the material's yield strength to elastic modulus. For the separation process, the material does not need to have good plasticity. The better the plasticity, the harder it is to separate. Our new energy Copper Stamped Components, the selection of materials goes through multiple processes to ensure that the finished product can provide the best performance.
(2) Requirements for material thickness tolerance: The material thickness tolerance should meet the specified standards. Because a certain mold gap is suitable for a certain thickness of material, a large material thickness tolerance will not only directly affect the quality of the product, but may also cause damage to the mold and punch.
(3) Quantitative control of material properties: Physical simulation technology is a necessary means to master the quantitative laws of material properties. Earlier physical simulation technology used some simulation materials and test methods with similar properties to the forming materials, mainly used to solve process feasibility problems. Some test equipment developed in recent years has provided a wider range of possibilities for testing material properties, and can perform compression and torsion tests. Metal Stamping Parts Electric Copper uses advanced test equipment in the manufacturing process, providing data support in many aspects to ensure convenience in the production process.

From the perspective of stamping parts processing technology, the mechanical properties, surface quality and thickness tolerance of stamping materials should meet the following basic requirements:
(1) Materials used for blanking should have sufficient plasticity and low hardness to improve the quality of the blanking section and dimensional accuracy. Among them, soft materials such as brass have good blanking performance, hard materials such as stainless steel and high carbon steel have poor blanking section quality, and brittle materials are prone to tearing during blanking. Our hardware stamping parts are diverse in material selection, and products can also be customized according to the requirements of different customers and equipment.
(2) Materials used for bending should have sufficient plasticity, low yield strength, and high elastic modulus. Among them, materials with good plasticity are not easy to bend and crack, and materials with low yield strength and high elastic modulus have small springback.
(3) Materials used for stretching should have good plasticity, low yield strength and hardness, and large plate thickness directional coefficient. Among them, materials with high hardness are difficult to stretch; materials with small yield strength ratio or large plate thickness directional coefficient are easy to stretch.
(4) The surface of the material should be smooth and clean, without defects such as scratches and abrasions, so as not to affect the appearance quality of the product, and facilitate stamping processing and subsequent processing such as welding and spraying.
(5) The thickness tolerance of the material should meet certain requirements: if the material thickness exceeds the tolerance, it will not only directly affect the stamping quality of the product and the life of the mold, but may even produce scrap or damage the mold.
(6) Reasonable selection of blank material The method of blank preparation in mechanical manufacturing directly uses profiles, casting, forging, stamping and welding. The selection of blanks is related to specific production technical conditions, and generally depends on production batches, material properties and processing possibilities.
(7) Simple and reasonable structure When designing the structural shape of parts, it is best to use the simplest surface such as plane, cylindrical surface, spiral surface and their combination. At the same time, the number of processed surfaces and the processing area should be minimized as much as possible.
(8) Specify the appropriate manufacturing accuracy and surface roughness of the parts process. The selection of materials and costs increase with the improvement of accuracy, especially in the case of high accuracy, this increase is extremely significant.

1.  Low carbon steel stretch stamping

(1) Material characteristics: excellent formability (depending on the material grade), high strength, lightweight, better cost performance than other stretch materials, stable forming dimensions, low corrosion resistance, and requires post-treatment protection such as electroplating. Commonly used in various parts in automobile manufacturing, especially high-strength structural parts.

(2) Impact on stamping process: Material procurement resources are abundant and low-tonnage machines are sufficient (depending on the material grade). The dimensions after forming have good stability, especially suitable for welding. There are different coatings in the raw material categories, which can save subsequent surface treatment. For example, the product after electroplating has a certain shelf life, which depends on its own corrosion resistance.

2. Stainless steel stretch stamping

(1) Material characteristics: high strength, lightweight, high corrosion resistance, suitable for heat treatment, good wear resistance and no need for electroplating protection. Commonly used in fuel supply systems, brake systems, emission systems, oxygen sensors and decorative parts in automobile manufacturing.

(2) Impact on the stretching and stamping process: Compared with other materials, it requires a large-tonnage machine. The wear on the mold during stretching is greater. The material is expensive. The size after forming has good stability (+/-0.02mm). The material hardens quickly and has resilience during stretching. It is difficult to form the material during stretching and it is difficult to control the wall thickness of the product. Experienced mold adjustment workers are required.

3. Aluminum alloy stretching and stamping
(1) Material properties: lightweight (about 1/3 of low carbon steel), high strength, non-magnetic, rust-proof, suitable for heat treatment, and can be anodized to prevent corrosion. It is commonly used in heat dissipation devices, energy storage devices (such as batteries), beverage containers, and pharmaceutical industries in automobile manufacturing and other industries.
(2) Impact on the stretching and stamping process: Compared with other materials, it requires a low-tonnage machine. The wear on the mold during stretching is greater. The size after forming has good stability (+/-0.04mm). The material is easy to form and has low resilience. The material is not easy to harden during stretching. For forming with inconsistent wall thickness, aluminum alloy stretching is achievable.

The article briefly introduces the basic requirements of stamping materials and describes the influence of the mechanical properties of the selected materials on the process in each process. Finally, the influence of common metal materials on the stamping process is referenced and learned. Our product Copper Pressed Stamped Parts uses high-quality materials and stamping machinery combined with computers. The quality of its finished products has certain standards, and high-precision surface treatment can also increase corrosion resistance and thermal stability.

 

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Good plasticity:

Copper has excellent plasticity and is easy to process by hot and cold pressing, which makes it possible to manufacture stamping parts with complex or fine shapes

Corrosion resistance:

Copper exhibits good corrosion resistance in the atmosphere, seawater and certain chemical environments, and is suitable for related parts in the chemical industry and marine environment

Strength and hardness:

Although the strength and hardness of copper are relatively poor, its excellent ductility and plasticity make it an ideal material for stamping

Processing accuracy:

Stamping parts can be made into workpieces with reinforcing ribs, ribs, undulations or flanges to improve their rigidity, and due to the use of precision molds, the workpiece accuracy can reach micron level, with high repeatability and consistent specifications

 

 

 

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