The membrane switch factory will use a lot of production processes in the production process, such as laser engraving process, silk screen printing process, stamping process, etc. Here we want to talk about the stamping process.
Membrane switch stamping process is a metal processing method. It is based on the plastic deformation of metal. It applies pressure to the sheet metal by using molds and stamping equipment to plastically deform or separate the sheet, so as to obtain a certain shape, size and shape. Performance parts (stampings). Stamping is mainly classified according to the process, which can be divided into two categories: separation process and forming process.
The separation process is also called blanking, and its purpose is to separate the stamping parts from the sheet along a certain contour line, while ensuring the quality requirements of the separation section.
The purpose of the forming process is to plastically deform the sheet without breaking the blank to make a workpiece of the desired shape and size. In actual production, multiple processes are often integrated into a workpiece. Punching, bending, shearing, stretching, bulging, spinning, and straightening are several main stamping processes.
The stamping forming process occupies an important position in the manufacturing process of the automobile body, especially the large-scale covering parts of the automobile body, because most of them have complex shapes, large structural dimensions, and some are spatially curved surfaces, and the surface quality requirements are high, so the stamping method is used. Making these parts is unmatched by other processing methods.
Widely used in automobiles, truck cabs, front sheet metal parts, household appliances, electronic instruments, communications, chemicals, textiles and aerospace, etc., almost all of them are made by stamping.
Features of membrane switch stamping process:
1. Stamping is a processing method with high production efficiency and low material consumption. The stamping process is suitable for the production of large batches of parts, which is convenient for mechanization and automation, and effectively improves the production efficiency. Surplus materials can also be fully utilized.
2. The operation process is convenient, and there is no need for the operator to have a higher level of skill.
3. Stamping can obtain parts with high strength, high rigidity and light weight.
4. Stamping parts have better interchangeability. Stamping processing stability is good, the same batch of stamping parts. Can be used interchangeably without affecting assembly and product performance.
5. The stamped parts generally do not need to be machined and have high dimensional accuracy.
6. Since the stamping parts are made of sheet materials, its surface quality is good, which provides convenient conditions for subsequent surface treatment processes (such as electroplating and painting).
7. Stamping can produce parts with complex shapes that are difficult to be processed by other metal processing methods.
8. The cost of stamping parts produced in batches with molds is low.
The stamping process of membrane switch can be divided into five basic processes:
1. Punching: The punching process (punching, blanking, trimming, planing, etc.) that separates the sheet material accounts for about 50% to 60% of the entire punching process.
2. Bending: a stamping process in which the sheet is bent into a certain angle and shape along the bending line, one of the main processes widely used in production, a plastic forming method for bending metal sheets, pipe fittings and profiles into a certain angle, curvature and shape , The bending of metal materials is essentially an elastic-plastic deformation process. After unloading, the workpiece will produce elastic recovery deformation in the direction, which is called rebound. Springback affects the accuracy of the workpiece and is a technical key that must be considered in the bending process.
3. Deep drawing: Deep drawing, also known as drawing or calendering, is a stamping method that turns a flat sheet into an open hollow part. Thin-walled parts with cylindrical, stepped, conical, spherical, box and other irregular shapes can be made by deep drawing. When combined with other stamping and forming processes, parts with extremely complex shapes can also be produced. In stamping production, there are many types of deep drawing parts. Due to their different geometrical characteristics, the position of the deformation zone, the nature of the deformation, the distribution of the deformation, and the stress state and distribution law of each part of the billet are quite different, even in essence. Therefore, the determination methods of process parameters, the number and sequence of processes, and the principles and methods of mold design are different. According to the characteristics of deformation mechanics, various deep-drawing parts can be divided into four types: straight-wall revolving body (cylindrical part), straight-wall non-revolving body (box-shaped body), curved surface revolving body (surface-shaped part) and curved non-revolving body. type.
4. Drawing shape: The drawing force is applied to the sheet through the drawing die, so that the sheet produces uneven tensile stress and tensile strain, and then the bonding surface of the sheet and the drawing die gradually expands until it is completely with the drawing model surface. fit. The applicable object of the pulling shape is mainly the hyperbolic skin with certain plasticity, large surface area, gentle and smooth curvature change, and high quality requirements (accurate shape, smooth streamline, and stable quality). Due to the relatively simple process equipment and equipment used in drawing, the cost is low and the flexibility is large; but the material utilization rate and productivity are low.
5. Spinning: It is a metal rotary processing technology. During the processing, the blank is actively rotated with the spinning die or the spinning head is actively rotated around the blank and the spinning die. body parts.
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