How to Choose Best Raw Material for Metal Stamping?

2021-05-11

As the demand for metal parts, components, and products continues to grow, so does the need for high speed, reliable manufacturing methods that can produce replicas of complex metal designs. Due to this demand, metal stamping has become one of the most versatile and popular manufacturing processes in the world today.

Developments in metal stamping capabilities and automated technologies have driven significant efficiency improvements in the process. It can produce simple, intricate, or complex parts in fast, cost-efficient batches while adhering to stringent design specifications with a high degree of accuracy.

It’s important for designers and engineers to know key information about the most common metals available for metal stamping processes to inform the material selection process. Each metal and alloy have different characteristics. Depending on the nature and application of the part, it might need either a common alloy or a specialty metal.

Choosing the best raw material for metal stamping, there are a variety of commonly used raw materials in metal stamping. The application itself will typically determine what metals can be stamped. The key factors of metals used in stamping include:

1. Common types of stamping materials
The commonly metal sheets are carbon steel, stainless steel, aluminum, copper and its alloys, etc. They have low deformation resistance and are suitable for cold stamping process.
    a. Copper and aluminum and their alloys are often used as components of electrical equipment because of their good ductility and excellent electrical conductivity.
    b. Carbon steel and stainless steel are often used for equipment shells, parts, cases, etc., but due to their high stiffness usually stamping oil is used to improve the process.

2. Considerations of stamping materials
There are three main stamping processes: blanking, bending and drawing. Different processes have different requirements for the plates, and the selection of materials should be considered according to the general shape of the parts and the processing process.
    a. Punching requires that the plate should have sufficient plasticity to ensure that the plate does not crack when punching. Soft materials have good processing performance, which can obtain parts with smooth cross-sections and small inclinations. The quality of hard material after punching is not good, and the unevenness of section is large, especially serious for thick plate material. For brittle materials, they are prone to tearing after punch, especially when the width is very small.
    b. If need to bend the plate, there should be sufficient plasticity, lower yield limit. High plasticity of metal sheet bending is not easy to crack, lower yield limit and lower modulus of elasticity of the plate, rebound deformation after bending is small, easy to get the exact size of the bending shape. For brittle material, bending must have a relatively large bending radius, otherwise easy to crack.
    c. Sheet metal drawing, especially deep drawing, is one of the more difficult sheet metal processing technology. Not only requires the depth of drawing as small as possible, the shape as simple as possible, and the transition as smooth as possible, but also requires a good plasticity, or else it is very easy to cause the overall distortion and deformation of the part, local wrinkling, and even pulling and cracking.

3. Rational selection of stamping materials
The selection of stamping materials should take into account the requirements of stamping parts, the requirements of stamping process and the cost.
    a. Be subject to the requirements of stamping parts
The selected material should enable the stamping part to work properly with a certain service life. For this purpose, it should meet the requirements of strength, stiffness, toughness, corrosion resistance and heat resistance according to the usage condition of stamping parts.
    b. Be subject to the requirements of stamping process
For any kind of stamping parts, the selected material should be able to form stable and qualified products without cracking or wrinkling according to the requirements of stamping process, which is the most basic and important requirement of material selection.
    c. Be subject to cost-effective requirements
The material selected should be as inexpensive, convenient and economical as possible to reduce stamping cost, while meeting the requirements of performance and stamping process.

The above is the method of selecting raw materials for stamping parts. The reasonable selection of raw materials can effectively improve quality of the workpiece. Welcome to discuss more details with Minzim team.