What is Sheet Metal Fabrication:
Materials & Main Features
Sheet Metal Fabrication is an important process of sheet metal forming. Sheet metal fabrication includes traditional cutting, blanking, bending and forming, various cold stamping die structures and process parameters, various equipment working principles and operation methods, as well as new stamping technologies. Like CNC machining, sheet metal fabrication is also a type of manufacturing process of metal materials, but the form of material is a little bit different. For example, making chimney, iron barrel, oil tank, ventilation pipe, elbow big and small end, funnel-shaped, etc. with sheet, the main processes include cutting, bending, edge buckle, bending forming, welding, riveting, etc., which requires certain geometric knowledge. Sheet metal parts are thin metal parts, which can be processed by stamping, bending, stretching, and other means. A general definition is the parts with constant thickness in the process of processing. Corresponding to the casting parts, forging parts, machining parts, and so on.
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Sheet Metal Fabrication Materials
The materials commonly used in sheet metal fabrication are cold rolled plate (SPCC), hot rolled plate (SHCC), galvanized plate (SECC, SGCC), copper (Cu) brass, red copper, beryllium copper, aluminum plate (6061, 5052, 1010, 1060, 6063, duralumin, etc.), stainless steel. According to the different functions of products, different materials are selected, which generally need to be considered from the use and cost of products.
1. Cold rolled plate SPCC: mainly used for electroplating and paint parts, low cost, easy forming, material thickness ≤ 3.2mm.
2. Hot rolled plate SHCC: is also used for electroplating, paint parts, low cost, but difficult to shape, mainly flat parts.
3. Galvanized sheet SECC, SGCC: SECC electrolytic plate is divided into N-material and P-material. N-material is mainly not used for surface treatment, so the cost is high. P-material is used for spraying parts.
4. Copper: it mainly uses conductive materials, and its surface treatment is nickel plating, chromium plating, or no treatment, so the cost is high.
5. Aluminum sheet: generally used surface chromate (j11-a), oxidation (conductive oxidation, chemical oxidation), high cost, silver plating, nickel plating.
6. Aluminum profiles: materials with complex cross-section structures are widely used in various plug-in boxes. The surface treatment is the same as that of the aluminum plate.
7. Stainless steel: mainly used without any surface treatment, high cost.
Sheet Metal Fabrication Features
1. High power and high density: the workpiece absorbs the rapid rise of temperature after sheet metal processing and melts or vaporizes. Even materials with high melting point, high hardness, and brittle quality (such as ceramics, diamond, etc.) can be processed with sheet metal;
2. The bundle is easy to control: it is easy to combine with precision machinery, precision measurement technology, and computer to achieve high automation and high machining accuracy;
3. Convenient and flexible: in harsh environments or places that are difficult for other people to access, robots can be used for sheet metal processing.
4. A wide range of applications: the divergence angle of sheet metal processing beam can be less than 1 milliarc, the spot diameter can be as small as micron, and the action time can be as short as nanosecond and picosecond. At the same time, the continuous output power of high-power sheet metal processing can reach kilowatt to 10kW. Due to many welding methods used in industrial production, it can be divided into three categories according to the characteristics of the welding process:
- Fusion welding: the common feature of this kind of welding method is to use the local heating method to heat the joint of the weldment to the melting state, fuse with each other, and combine with each other after condensation. Common arc welding and gas welding belong to this category.
- Pressure welding: the common feature of this kind of welding method is that when welding, no matter whether the welding is heated or not, a certain pressure is applied to make the two joint surfaces contact closely, so as to promote the nodule effect between atoms, so as to obtain the firm connection between the two weldments. The resistance welding and friction welding belong to this category.
- Brazing: it is similar to fusion welding, but there is an essential difference between them. In this method, the solder with a lower melting point than the weldment is heated together with the weldment to make the solder melt, but the weldment itself does not melt. The liquid solder is used to wet the weldment, fill the joint gap, and diffuse with the weldment, so as to realize the combination with the solid metal to be welded and connect with each other after condensation.
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