Technical Informations

The process of sheet metal machining

The detailed process of sheet metal machining:

1. Draw a part drawing. Design and draw the parts drawing of its sheet metal parts, also called three views. Its role is to use drawings to express the structure of its sheet metal parts.

2. Draw a development map. That is, a complicated structural part is developed into a flat piece.

3. Blanking. There are many ways to cut materials, mainly in the following ways:

a. Guillotine cutting. The length and width dimensions of the development drawing are cut out using a shearing machine. If there is punching, cutting angle, and then turn punching machine with mold punching, cut corner forming.

b. Bar stock cutting by punching .The punching machine is used to punch one or more steps in the plate to expand the parts after the flat plate structure is punched into shape. Its advantages are short working hours, high efficiency, reduced processing costs, and often used in mass production.

c. CNC cutting. When CNC cutting, you must first write the NC machining program. It is the use of programming software to program the drawn development as a recognizable program for the NC machining machine. Let it follow the procedures step by step on an iron plate and punch out the structural shape of its flat parts.

d. Laser cutting. Laser cutting is used to cut out the shape of a flat piece on an iron plate.

4, Flanging tapping. The flanging, which is also called punched hole, is to draw a slightly larger hole in a smaller base hole and then tap it on the hole. Doing so can increase its strength and avoid slipping. It is generally used for thinsheet metal processing. When the plate thickness is large, such as plate thickness of 2.0, 2.5, etc., we can tap directly, without flipping.

5, Punch processing. To achieve the purpose of processing, the general punching processing methods include punching and cutting angle, punching and blanking, punching and bulging, punching, etc. Its processing requires a corresponding mold to complete the operation. The convex bulge has a convex hull mold, and the puncture has a tear forming mold.

6, Pressure riveting. Press riveting for the factory, there are pressure riveting studs, pressure riveting nuts, pressure riveting screws, etc. which are often used. The pressure riveting method is usually performed by a punch press or a hydraulic pressure riveting machine to rivet it to asheet metal part.

7, Bend. Bending is folding a 2D panel into a 3D part. The processing requires a folding bed and a corresponding bending die to complete the operation. It also has a certain sequence of bending. The principle is that it does not interfere with the next knife, and it will produce a posterior fold of interference.

8, Welding. Welding is the welding of multiple parts to achieve the purpose of processing or a single part of the seam welding to increase its strength. Its processing side generally has the following kinds: CO2 gas protection welding, argon arc welding, spot welding, robot welding and so on. The selection of these welding methods is based on actual requirements and materials. In general, CO2 gas shielded welding is used for iron plate welding; argon arc welding is used for aluminum plate welding; robot welding is mainly used when the material is large and the weld seam is long. Such as cabinet welding, robot welding can be used to save a lot of tasks, improve work efficiency and welding quality.

9, Surface treatment. Surface treatment generally has a phosphating film, electroplating multicolored zinc, chromate, paint, oxidation and so on. Phosphating film is generally used for cold-rolled sheet and electrolytic sheet, and its function is mainly to coat a protective film on the material sheet to prevent oxidation; the second is to enhance the adhesion of the paint. Plating multicolored zinc is generally treated with cold-rolled plate surface; chromate, oxidation is generally used for surface treatment of aluminum plates and aluminum profiles; the selection of its specific surface treatment method is based on customer requirements.

10. Assemble. Assembly refers to the assembly of multiple parts or components in a certain way to make it a complete item. One thing that needs to be noted is the protection of the material and it must not be scratched. Assembly is the last step in the completion of an item. If the material cannot be used due to scratching, it needs to be reworked. It will waste a lot of processing time and increase the cost of the item. Therefore, special attention must be paid to the protection of the material.

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