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What are the metal stamping process?

Update:05-03-2021
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The metal stamping process can be divided into two cate […]

The metal stamping process can be divided into two categories: separation process and forming process. The purpose of the forming process is to make the sheet metal plastically deform without breaking the billet to make a workpiece of the required shape and size. The separation process is also called punching, and its purpose is to separate the stamping parts from the sheet along a certain contour line while ensuring the quality requirements of the separated section. In actual production, multiple processes are often applied to one workpiece. Blanking, bending, shearing, deep drawing, bulging, spinning, and correction are the main stamping processes.

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1. Design process drawings of processed parts
Design and draw the three parts of the hardware workpiece, its function is to express the structure of the sheet metal part through drawing. Draw the unfolding of the workpiece, that is, unfold the complicated part into a flat part. Analyze the part drawing, quickly understand the positional relationship of the workpiece size, coordinate point, line, curve and cutting surface, determine the origin of the workpiece coordinate, and calculate the coordinates of each vertex and the coordinate of the curve connection point.

2. Correct process method
The selection of the surface processing method of the workpiece is to select a reasonable processing method for each surface with quality requirements. Generally, the final processing method is selected according to the requirements of surface accuracy and roughness, and the processing method of the preparation process before finishing is determined, that is, the processing plan is determined.

3. Choose high-efficiency cutting method
The bottom of the scissors is the length and width of the scissors shape. If there is a punching angle and a chamfer, the punching and die punching are combined to form a chamfer. The bottom surface of the punch is a flat sheet structure used to wash parts after unfolding in one or more steps. Its advantages are short working time and high efficiency, and it is often used in batch manufacturing. Use the programming software to write the drawing expansion diagram into the recognizable content of the CNC machining machine tool. Let it be programmed to cut the structural shape of its tableware. Laser finishing is a structure that uses laser cutting to cut out the shape of a board.

4. Formulate the stamping sequence
Generally, there are processing procedures such as punching angle punching, punching convex shell, punching and tearing, pumping, etc. The processing requires corresponding molds to complete the operation. In addition, the bending process also requires a bending bed and corresponding bending molds to complete the operation. The design principle is to give priority to the next step without interference.

5. Complete the process of fastening parts
Generally, the operation is completed by stamping riveting process or hydraulic riveting machine. Fasteners are riveted on sheet metal parts. Pressure riveting is commonly used in pressure riveting bolts, compression riveting nuts, and pressure riveting screws. The process of flanging taps is to dig a slightly larger hole in the smaller bottom hole, and then suck the tap hole. This can increase its strength and avoid sliding teeth. It is generally used for workpieces with high sheet thickness. When the sheet thickness is large, it does not need to be flanged and tapped directly.

6. Part assembly method
Welding welds multiple parts together for processing purposes or the joints of a single part to increase its strength. Surface treatment usually has phosphate film, electroplated multi-color zinc, chromate, baking varnish, oxidation, etc. The choice of specific surface treatment method is based on demand. Assembly is the assembly of multiple parts or assemblies in a way that makes it a complete project.

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