Stamping characteristics of commonly used materials stainless steel

Due to its unique characteristics, stainless steel is not only beautiful in appearance, but also has strong plasticity and high corrosion resistance, which is deeply loved by users.

  1. The yield point is high, the hardness is high, and the cold work hardening effect is significant. However, it is prone to cracking.
  2. The thermal conductivity is worse than that of ordinary carbon steel, resulting in large deformation force, large blanking force and deep drawing force.
  3. The plastic deformation force is large when it is stretched, and it is easy to wrinkle and break when the material is too thin.
  4. The phenomenon of sticking mold and shape strain is easy to occur when stretching.
  5. Because of its high hardness and high corrosivity, it is often used as some structural parts, exterior parts and outdoor parts.

Selection of automotive stamping die materials

Due to the different functions of various parts in the mold, the requirements for the materials and the principles of selection are also different. Therefore, reasonable selection of mold materials is also an important task in die design, which has a great impact on the cost and production quality of the mold.

Generally speaking, automotive stamping die materials need to meet the following conditions:

  1. For automobile stamping dies with simple shapes and small sizes, the use of commonly used carbon tool steel materials such as T8A and T10A can meet production requirements.
  2. For automobile stamping dies with complex shapes and larger sizes, alloy tool steels or high-speed tool steels, such as Cr12, Cr12MoV, W18Cr4V, W6MoS, Cr4V2, etc., are often used as stamping die materials.
  3. Some automobile molds require high stamping accuracy and service life, so cemented carbide or steel-bonded cemented carbide is commonly used as raw materials, such as YG15, YG20, GW50, etc.
  4. There are many large parts in automobile stamping dies, which are usually made of ordinary cast iron or cast carbon steel, such as gray cast iron HT250, cast steel 2G270-500, etc., and some molds will also be hardened by surfacing on the cutting edge.

There are many types of automobile stamping dies. In addition to the material selection of the main working dies, we must also pay attention to the materials of guide posts and guide sets. Generally, low-carbon steel or bearing steel of high-quality carbon steel can meet the production and Quenching demand.

In general, automobile stamping die manufacturing to go through the following processes, that is forging, cutting and heat treatment. In order to ensure the manufacturing quality of the die and reduce the production cost, the material should have excellent malleability, machinability, hardenability, hardenability, grindability and decarburization sensitivity, so the material selection of automobile die is important and strict.


Sheet metal materials and sheet metal processing experience

  1. Definition of sheet metal: cold working of sheet metal
    Metal: steel, aluminum, copper, etc.
    Sheet: 6mm ‘or less
    Cold working: cutting / punching / cutting / folding
  2. Uses of sheet metal
    Manufacturing cabinets, car shells, support parts, and general metal appearance parts are all used for sheet metal materials.
  3. Commonly used materials for sheet metal
  •  Cold rolled sheet
    Specification range: thickness 0.25 ~ 3.0mm, materials above 3.0mm must be customized.
    1220mm and 1250 mm specifications, the length can be cut to any size as required. Generally it is 2440mm and 2500mm.
    Material characteristics: The surface is iron gray luster, and the surface is easy to be scratched and rusted. Care must be taken during processing to quickly reverse the order.
  • Hot rolled plate
    Specification range: thickness 1.4 ~ 6.0mm, maximum width 1524mm, generally
    1250mm or 1220mm, the material length can be cut to any size as required. Generally it is 2500mm or 2440mm.
    Material characteristics: The surface of the material is black and gray, which is not easy to be scratched, but easy to rust. It must be removed during processing. Suitable for structural parts such as baking paint and dusting.
  • Stainless steel
    General term for stainless acid-resistant steel that is resistant to atmospheric, acid, alkali, salt and other media. To achieve stainless and corrosion resistance, there are many types due to different alloy types and contents. Stainless steel features: good corrosion resistance, good brightness, high strength; a certain degree of elasticity; the surface treatment is mainly because the surface quality of the plate is sometimes not high after treatment (such as drawing) can improve the surface quality. Our company usually uses sus201 SUS304 and SUS316.
  • Galvanized sheet
    Galvanized sheet is galvanized on the surface of q235, so the name is galvanized sheet.
    Thickness specification 0.3 ~ 3.0mm, surface zinc flower types are: normal zinc flower (Z) light zinc flower (G), small zinc flower (X), light zinc flower (GX) zero zinc flower (N), zinc Ferroalloy (R).
  • Aluminum plate
    As the aluminum material for the plate, there are mainly the following two types, namely industrial pure aluminum and rust-proof aluminum. These two materials have high plasticity, good weldability, high corrosion resistance, but poor cutting ability.
    The aluminum content of industrial pure aluminum is greater than 99.00%, and usually has the following grades: 1050, 1060, 1070, 1100, 1200. The plate specifications are mostly 1250X2500 or 1000X2000. The thickness is from 0.3-7.0mm.

Sheet metal processingCutting: CNC punch, ordinary punch, LASER cutting machine, etc. Laser cutting: Fiber cutting gas cutting (cost calculated along the meter) is not suitable for cutting reflective materials. The film on the mirror panel must be removed during laser cutting, and the film must be attached when bending. Need to dot plasma cutting plasma cutting: cheap, suitable for cutting thick plates, conductive, there will be bevels, low precision can cut round tubes, small plasma cutting machine, easy to carry flame cutting, acetylene, cutting thick plates, laser small waterjet, Some materials are not suitable for thermal cutting.

How was the car made?

The stamping production process is a process of stamping a steel plate into a car body, that is, a body cover and a structural part. Stamping is a traditional material forming process. With the development of the automotive industry, stamping process is widely used in manufacturing. The stamping process greatly improves the accuracy and efficiency of material molding. Take the automotive industry as an example, stamping can punch a part every 5s, and the accuracy of the parts can generally reach more than 95%.

The development of stamping technology depends on the advancement of mold technology. Since the 1960s, computer technology has improved and its application in the manufacturing industry. CAD, CAE, CAM and other computer-aided systems, automotive mold development and manufacturing efficiency have greatly improved The machining accuracy of the large 5-axis machining center reaches 0.01mm, and the servo press also brings great convenience to mold debugging and part molding.

The stamping process of automobile parts generally includes four processes: drawing process, trimming process, punching process and flanging process. Each process corresponds to a set of molds. Sometimes in order to save costs, a set of molds is made for the subsequent trimming and punching processes and compressed into three steps.

The stamping process of automobile enterprises is basically similar, but the stamping technology of different materials is different. At present, under the background of automobile lightweight, aluminum body is used by more and more automobile enterprises. Due to the difference of material properties between aluminum and steel, aluminum body has some technical difficulties in stamping, and the manufacture of automobile mould also needs different surface treatment.

Four common stamping processes for stamping parts

Metal stamping parts are a processing method with higher production efficiency, less material loss and lower processing cost.

It is more suitable for mass production of parts, is easy to realize mechanization and automation, has high accuracy, and is also convenient for post-processing of parts.

In general metal stamping parts, in the production process, there are the following four processing processes:

  1. Punching: The stamping process (including punching, blanking, trimming, cutting, etc.) that enables the sheet to be separated.
  2. Bending: A stamping process in which the sheet is bent into a certain angle and shape along the bending line.
  3. Deep drawing: a stamping process that changes the flat sheet into various open hollow parts, or further changes the shape and size of the hollow part.
  4. Partial forming: A stamping process (including flanging, bulging, leveling, and shaping processes) that uses various local deformations of different properties to change the shape of the blank or stamped part.

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