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That is cool, we talk about sheet metal and stamping parts today. The most of people will confuse about sheet metal and stamping process. They always think both of them are same. Actually that is not correct thing. I will show you the concept and tell you the difference. In addition, we could step forward to understand stamping and sheet metal parts in automotive industry.

What is sheet metal, and stamping part?

Sheet metal, a kind of processing technology, has not yet a relatively complete definition of sheet metal. According to a definition in a foreign professional journal, it can be defined as: sheet metal is a comprehensive cold working process for sheet metal (usually less than 6 mm), including shearing, punching / cutting / compounding, folding, riveting, splicing, forming (such as automobile body), etc. Its remarkable feature is that the thickness of the same part is the same.


Stamping part is a kind of forming processing method which uses press and die to exert external force on plate, strip, pipe and profile to produce plastic deformation or separation, so as to obtain the required shape and size of the work-piece (stamping part). Stamping and forging belong to plastic processing (or pressure processing), collectively known as forging. The stamping blank is mainly hot-rolled and cold-rolled steel plate and strip.


Process characteristics

Sheet metal has the characteristics of light weight, high strength, conductive (can be used for electromagnetic shielding), low cost, good mass production performance and so on. It has been widely used in the fields of electronic appliances, communication, automobile industry, medical equipment, etc., for example, in computer case, mobile phone, MP3, sheet metal is an essential part. With the application of sheet metal more and more widely, the design of sheet metal has become a very important part in the process of product development. Mechanical engineers must master the design skills of sheet metal parts, so that the designed sheet metal can not only meet the requirements of product function and appearance, but also make the stamping die manufacturing simple and low cost.


Metal or non-metallic sheet metal is mainly formed by stamping die with the help of the pressure of press. It has the following characteristics:

1. The stamping parts are produced by stamping on the premise of little material consumption. The parts have light weight and good stiffness. After plastic deformation, the internal structure of metal is improved, and the strength of stamping parts is improved.

2. The stamping parts have high dimensional accuracy, uniform size with the same die, and good interchangeability. It can meet the general assembly and use requirements without further machining.

3. In the stamping process, because the surface of the material is not damaged, it has good surface quality, smooth and beautiful appearance, which provides convenient conditions for surface painting, electroplating, phosphating and other surface treatment.


Sheet metal stamping parts in Automotive industry

Many things in our life are formed by precision hardware processing, such as auto parts, bolts, mobile phone shells, etc. Recently, many friends who are engaged in this field ask what is the difference between auto sheet metal parts and stamping parts?


Sheet metal stamping parts include stamping parts, not all sheet metal is stamping parts. Stamping part is a kind of forming processing method which uses press and die to exert external force on plate, strip, pipe and profile to produce plastic deformation or separation, so as to obtain the required shape and size of the workpiece (stamping part). Stamping and forging belong to plastic processing (or pressure processing), collectively known as forging. The stamping process can be divided into separation process and forming process (including bending, drawing and forming).


The separation process is to separate the stamping part and the blank along a certain contour line in the stamping process. At the same time, the quality of the separated section of the stamping part should also meet certain requirements. The forming process is to make the stamping blank plastic deformation under the condition of no damage, and transform it into the required finished product shape, and also meet the requirements of dimensional tolerance and other aspects. According to the stamping temperature, there are cold stamping and hot stamping. This depends on the strength, plasticity, thickness, deformation degree and equipment capacity of the material, and the original heat treatment state and final service condition of the material should be considered.


Sheet metal is a comprehensive cold working process for sheet metal (usually less than 6 mm), including shearing, punching / cutting / compounding, folding, welding, riveting, splicing, forming (such as automobile body), etc. Its remarkable feature is that the thickness of the same part is the same. Generally speaking, the basic equipment includes shear, CNC punch, plasma and water jet cutting machine, compound machine, bending machine and various auxiliary equipment, such as uncoiler, leveling machine, deburring machine, spot welding machine, etc.