1.Familiar with drawings

Sheet metal processing is based on drawings, and different blanking methods are selected according to the development drawings and batches. Among them are laser, CNC punching, shearing plates, molds, etc., and then the corresponding expansion is made according to the drawings.

2. Sheet blanking

CNC punches are affected by the tool. For some special-shaped workpieces and irregular holes, large burrs will appear on the edges. Later deburring should be performed, and at the same time, the accuracy of the workpiece will be affected.

Laser processing has no restrictions on tools and has a flat cross-section, which is suitable for processing special-shaped workpieces, but it takes longer to process small workpieces. Placing a table next to the CNC and the laser will help the sheet to be placed on the machine for processing and reduce the workload of lifting the board.

Some scraps that can be used are placed in designated places to provide material for the trial mold during bending.

3. Polishing

After the workpiece is blanked, the corners, burrs, and contacts need to be trimmed (grinded). At the tool contact, use a flat file to trim. For workpieces with larger burrs, use a grinder to trim, and the small inner hole contact The corresponding small file is used for trimming to ensure the beautiful appearance. At the same time, the trimming of the shape also guarantees the positioning during bending, so that the workpiece is placed on the bending machine at the same position during bending to ensure the same size of the same batch of products.

After the blanking is completed, it enters the next process, and different workpieces enter the corresponding process according to the processing requirements. There are bending, riveting, flanging and tapping, spot welding, convex bulging, and step difference. Sometimes, after bending one or two passes, the nut or stud must be pressed. Among them, the mold has convex bulging and step difference. Processing first, so as not to interfere with other processes after the first processing, the required processing cannot be completed. When there is a hook on the upper cover or the lower case, if it cannot be welded after bending, it must be processed before bending.

 Sheet metal processing

4.Bend

When bending, you must first determine the tools and sipes used for bending according to the size and material thickness of the drawing. Avoiding the collision between the product and the tool is the key to the selection of the upper mold (in the same product, it may be used The upper mold of different models), the choice of the lower mold is determined according to the thickness of the plate.

The second is to determine the sequence of bending. The general rule of bending is inside first, then outside, first small and then big, first special and then ordinary. The workpiece with the dead edge is first bent to 30 ° -40 °, and then the workpiece is crushed to death with a leveling die.

5.Riveting

When pressing the riveting, we must consider the height of the studs and choose the same different mold, and then adjust the pressure of the press to ensure that the studs and the surface of the workpiece are flush. scrapped.

6.Welding

Welding includes argon arc welding, spot welding, carbon dioxide shielding welding, manual arc welding, etc. Spot welding must first consider the position of the workpiece welding, and consider the positioning tool to ensure accurate spot welding position in mass production. In order to weld firmly, bumps are formed on the workpiece to be welded, so that the bumps can evenly contact the flat plate before the current welding to ensure that the points are heated uniformly. At the same time, the welding position can also be determined. Adjust the preload time, dwell time, hold time, and rest time to ensure that the workpiece can be spot welded firmly.

Welding scars will appear on the surface of the workpiece after spot welding. It must be processed by a flat grinder. Sub-arc welding is mainly used when two workpieces are large and connected together, or when the corners of one workpiece are processed to achieve a flat surface. ,smooth. The heat generated during sub-arc welding easily deforms the workpiece. After welding, it must be processed with a grinder and a flat grinder, especially in the corners.

In addition to the strict requirements for the quality of sheet metal parts in the production process, it is necessary to inspect the quality independently of the production. One is to strictly control the dimensions according to the drawings, and the other is to strictly control the appearance and quality. It is allowed to be scratched and inspected for color difference, corrosion resistance, adhesion after spraying. In this way, it is possible to find errors in the unrolled drawings, bad habits in the manufacturing process, and errors in the manufacturing process, such as programming errors and mold errors.