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Process analysis of sheet metal chassis processing

According to the difference of the sheet metal hardware structure, the chassis processing process can be different, but the total does not exceed the following
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1. Cutting material:
①Shearing machine: It uses a shearing machine to cut simple strips. It is mainly used for mold blanking and forming. The cost is low, and the accuracy is less than 0.2, but it can only process strips or blocks with no holes and no corners. .
②Punch: It uses the punch to punch out the flat parts after unfolding the parts on the metal plate in one or more steps to form various shapes of materials. Its advantages are short man-hours, high efficiency, high precision, low cost, and suitable for large quantities. Production, but to design molds.
Using mold forming processing procedures, generally punching, cutting corners, blanking, punching convex hull (bump), punching and tearing, punching, forming and other processing methods are generally processed by punching. The processing needs to be completed by corresponding molds. Operations, such as punching and blanking die, convex die, tearing die, punching die, forming die, etc. The operation mainly pays attention to position and directionality.
2. Fitter: counterbore, tapping, reaming, drilling-counterbore angle is generally 120℃, used for pulling rivets, 90℃ used for countersunk screws, and tapping inch bottom holes.
3. Flanging: It is also called hole extraction and hole flanging, which is to draw a slightly larger hole on a smaller base hole and then tap it. It is mainly processed with thinner sheet metal to increase its strength and thread. The number of turns to avoid slipping teeth. It is generally used for shallow flanging where the thickness of the plate is relatively thin, and the thickness of the hole is normal. There is basically no change in the thickness. When the thickness is allowed to be thinned by 30-40%, the height of the flanging can be higher than the normal flanging. For a height of 40-60%, the maximum flanging height can be obtained when the thinning is 50%. When the plate thickness is large, such as 2.0, 2.5, etc., it can be tapped directly.
4. Pressure riveting: There are mainly pressure riveting nuts, screws, and so on. The operation is completed by hydraulic pressure riveting machine or punching machine, riveting them to the hardware, and the way of expanding riveting. Pay attention to the directionality.
5. Bending: bending is to fold 2D flat parts into 3D parts. The processing needs to be completed with a folding bed and corresponding bending molds, and it also has a certain bending sequence. The principle is that the next cut will not interfere with the first folding, and the interference will occur after the folding. Under normal circumstances, first press riveting and then bend, but some materials will interfere after pressing riveting, and then press first, and some need to bend-press riveting-then bend and other processes.
6. Welding: Welding is divided into a melting welding: argon arc welding, CO2 welding, gas welding, manual welding; b pressure welding: spot welding, butt welding, bump welding; c brazing: electric chromium welding, copper wire, etc. Each has its advantages and disadvantages.