Sheet metal has not yet been defined as a complete definition, which can be defined as a comprehensive cold processing technology for sheet metal (usually below 6mm), including shearing, punching / cutting / composite, folding, welding, riveting, splicing, forming (such as car body). . The notable feature is the same thickness of the same parts.
Sheet metal cutting is an important process for sheet metal forming. It includes traditional cutting blanking, blanking processing, bending and pressing forming and other methods and process parameters, including various cold stamping die structure and process parameters, various equipment working principles and operation methods, including new stamping technology and new technology.For any sheet metal part, it has a certain process, that is, the so-called technological process. With the difference of sheet metal structure, the process may be different, but the total does not exceed the following points.
1, design and draw part drawings of its sheet metal parts, also called three views. Its function is to express the structure of sheet metal parts by drawing.
2, draw the expansion map. That is to develop a complex part into a flat panel.
3. Blanking: there are many ways to cut stock, mainly in the following ways:
A, cutting bed material. It is to use the scissors to cut out the length and width of the expansion plan. If there is piercing and corner cutting, the punching machine will be combined with die punching and corner cutting.
B, blanking of punching machine. It is the use of punching machine to step or piece the structure of sheet parts after stamping. Its advantages are short work time and high efficiency, which can reduce processing cost and is often used in mass production.
C and NC NC cutting: when NC is blanking, NC machining program is first written. It is to use programming software to compile the expanded drawing to be a recognizable program of NC CNC machine tool. Let them step by step with these programs on a piece of iron plate, and punch out the structural shape of the flat panel.
D and laser blanking are cut out by means of laser cutting on a piece of iron plate.
4, flanging tapping: flanging is also called pumping hole, which is to draw a slightly larger hole on a smaller base hole and then tapping on the hole. This can increase its strength and avoid slipping. It is generally used for sheet metal processing with thin plate thickness. When the plate thickness is large, such as 2 and 2.5 above the thickness of the plate, we can directly tapping without flanging.
5, punch processing: General punch processing has punching, cutting, punching, blanking, punching, punching, tearing, holes and other processing methods, in order to achieve the purpose of processing. Its processing needs to have the corresponding mold to complete the operation. The convex hull has a convex mold and a tearing forming die.
6, pressure riveting: pressure riveting in our factory, often used in the pressure riveting studs, pressure riveting nuts, pressure riveting screws and so on, the pressure riveting mode is usually completed through the punch or hydraulic pressure riveter to complete the operation, it is riveted to the sheet metal parts.
7, bending. Bending is the part of the 2D plate which is folded into 3D. The processing needs to have a folding bed and corresponding bending die to complete the operation. It also has a certain order of bending, the principle of which is to break the first step without interfering, resulting in a subsequent break of interference.
8. Welding. Welding is to weld multiple parts together to achieve the purpose of processing or to weld single parts by side seam to increase their strength. Its processing parties usually have the following kinds: CO2 gas shielded arc welding, argon arc welding, spot welding, robot welding and so on. The selection of these welding methods is based on actual requirements and materials. Generally speaking, 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 larger and the weld is longer. If the cabinet is welded, robot welding can be used, which can save many tasks and improve work efficiency and welding quality.
9. Surface treatment. Surface treatment usually includes phosphating film, galvanized multicolor zinc, chromate, baking paint, oxidation and so on. Phosphating coating is usually used for cold rolling plate and electrolytic plate, which is mainly coated with a protective film on the table to prevent oxidation, and then it can enhance the adhesion of the paint. The plating of cold-rolled zinc is usually treated with cold rolled plate. Chromate and oxidation are generally used for surface treatment of aluminum and aluminum. The selection of specific surface treatment methods is based on the requirements of customers.
10. Assembly. The so-called assembly is to integrate multiple parts or components in a certain way and make them into a complete material. What we should pay attention to is to protect the material, not to scratch, and assembly is the last step of the finished product. If the material can not be used because of scratches, it is necessary to rework and rework. It will waste a lot of processing time and increase the cost of the material. Therefore, we should pay special attention to the protection of the material.
标签:   钣金加工 钣金加工厂家