The following is a brief analysis of the various functions of sheet metal processing in Kunshan.

      Connection: Many products need to be assembled, but assembly needs to be connected. There are many types of connections, such as welding, riveting, and riveting. Welding is relatively common. Welding includes spot welding, argon welding, etc. The following analysis focuses on spot welding. After the welding parts are assembled, pressure is applied through the electrodes, and the contact surface of the current joint and the nearby area generate resistance heat for welding. Aluminum and iron, aluminum and copper, stainless steel and tinplate can be mixed welding, but spot welding of aluminum and aluminum is more difficult. The total thickness of spot welding must not exceed 8mm, and the size of the welding spot is generally 2T + 3 (2T represents the material thickness of the two weldments). Because the upper electrode is hollow and cooled by cooling water, the electrode cannot be reduced indefinitely. The minimum diameter Generally, it is 3 to 4 mm. Spot-welded workpieces must be punched on one side of each other in order to increase the welding strength. Usually, the size of the row-weld is φ1.5-2.5mm and the height is about 0.3mm. The thicker the weldment, the larger the center distance between the two welding points. If it is too small, the workpiece will be easily deformed due to overheating. If it is too large, the strength will not cause cracks between the two workpieces. Generally, the distance between the two welding points does not exceed 35mm (for materials below 2mm) ). The gap between the two workpieces before spot welding generally does not exceed 0.8mm. When the workpiece is spot welded after bending, the position and height of the row welding spot is very important at this time. If it is not proper, the spot welding is likely to be misplaced or deformed, causing errors. Big.

      Argon welding: Arc welding using argon as a shielding gas. It must be positioned with a clamp. The heat generated by argon welding is particularly large, which makes the workpiece easily deformed, and the thin material is more likely to burn out. The melting point of aluminum and aluminum alloy is low, the strength and shape are low at high temperature, the welding accidentally will burn through, and the weld will appear on the weld surface. If the two aluminum materials are welded on a plane, usually punch a salad hole on one side to enhance the welding strength. If it is long seam welding, segment spot welding is generally performed. The length of spot welding is about 30mm (metal thickness 2 ~ 5mm). When welding two iron workpieces, if the two workpieces are welded vertically, consider opening process positioning holes and positioning holes on the two workpieces, so that they can be positioned themselves, and the port cannot exceed the thickness of the other workpiece, and can also be punched and positioned. Point to position the workpiece and clamp the welded place with a clamp to prevent the workpiece from being affected by heat and causing inaccurate dimensions.

        Nail riveting: Pull two parts with through-holes through a nail with a nail gun, and pull the rod until it breaks, so that the outer sleeve of the nail is enlarged, so that it becomes a non-removable connection body. Pull studs are divided into two types: flat head and round head (also called umbrella). For the riveting of flat head rivets, the side in contact with the rivet head must be a salad hole, and the contact surfaces of the rivets of round head rivets are all flat. The distance from the center of the nail hole to the edge is greater than 2 times the size of the nail hole. At this time, the riveting strength is the best. If it is too small, the strength is reduced.

Sheet metal processing