Stamping classification

U型螺杆 副本1Stamping is mainly classified according to process, and can be divided into two categories: separation process and forming process. The separation process is also called punching, and its purpose is to separate the stamping parts from the sheet material along a certain contour line, while ensuring the quality requirements of the separation section. The purpose of the forming process is to make the sheet plastically deform without breaking the blank to make a workpiece of the desired shape and size. In actual production, multiple processes are often applied to a workpiece. Punching, bending, shearing, stretching, bulging, spinning, and straightening are just a few of the main stamping processes. [3]
Separation process
It is a basic stamping process that uses a mold to separate materials. It can be directly made into flat parts or prepare blanks for other stamping processes such as bending, deepening, forming, etc., and can also be used to cut, trim, etc. . Punching is widely used in industrial sectors such as automobiles, household appliances, electronics, instrumentation, machinery, railways, communications, chemicals, light industry, textiles, and aerospace. Punching processing accounts for about 50% to 60% of the entire stamping process. [2]
Forming process
Bending: A plastic forming method that bends metal plates, pipes and profiles into a certain angle, curvature and shape. Bending is one of the main processes widely used in stamping parts production. The bending of metal materials is essentially an elastoplastic deformation process. After unloading, the workpiece will produce elastic recovery in the direction of deformation, called rebound. Springback affects the accuracy of the workpiece and is a technical key that must be considered in the bending process.

Deep drawing: Deep drawing is also called drawing or calendering, which is a stamping processing method that uses a die to turn a flat blank obtained after punching into an open hollow part. The deep-drawing process can be used to make cylindrical, stepped, tapered, spherical, box-shaped and other irregular-shaped thin-walled parts. If combined with other stamping and forming processes, parts with extremely complex shapes can also be manufactured. In stamping production, there are many types of drawn parts. Due to their different geometrical characteristics, the location of the deformation zone, the nature of the deformation, the distribution of the deformation, and the stress state and distribution of the various parts of the blank are quite large, or even essential. 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 drawing parts can be divided into four types: straight-walled revolving body (cylindrical part), straight-wall non-revolving body (box-shaped body), curved revolving body (curved shape part) and curved non-revolving body. Types of.

Tension is to apply tension to the sheet material through the tension die, so that the sheet material produces uneven tensile stress and tensile strain, and then the mating surface of the sheet and the tension die gradually expands until it completely fits the surface of the tension model. The applicable objects of the pull-shape are mainly double-curvature skins with certain plasticity, large surface area, gentle and smooth curvature changes, and high quality requirements (accurate shape, smooth streamline, stable quality). Because the process equipment and equipment used for drawing is relatively simple, the cost is low and the flexibility is large; however, the material utilization rate and productivity are low.

Spinning is a metal turning process. During the processing, the billet is actively rotated with the spinning die or the spinning head is actively rotated around the billet and the spinning die, and the spinning head makes a feed motion relative to the core die and the billet to cause continuous local deformation of the billet to obtain the required hollow rotation. Body parts. [2]
Shaping is to use the established shape of the abrasive tool to perform secondary trimming on the shape of the product. Mainly reflected in the pressure plane, spring feet and so on. When some materials have elasticity and cannot guarantee the quality of one-time molding, they are processed again.
Bulging is a processing method that uses a die to make the sheet thin and thin to increase the local surface area to obtain parts. Commonly used are undulating forming, bulging of cylindrical (or tubular) blanks and stretch forming of flat blanks. Bulging can be achieved by different methods, such as rigid die bulging, rubber bulging and hydraulic bulging.
Flanging is a plastic processing method of bending the material of the thin plate blank edge or the narrow band area of ​​the prefabricated hole edge on the blank along a curve or a straight line. Flanging is mainly used to strengthen the edge of the part, remove the trimming, and make a part on the part that is assembled and connected with other parts or a three-dimensional part with complex and special shape and reasonable space, and at the same time increase the rigidity of the part. It can also be used as a means to control cracks or wrinkles during large sheet metal forming. Therefore, it is widely used in industrial sectors such as automobiles, aviation, aerospace, electronics and household appliances.
Shrinkage is a stamping method that reduces the diameter of the open end of a flanged hollow piece or tube blank that has been stretched. The diameter change of the end of the workpiece before and after shrinkage should not be too large, otherwise the end material will wrinkle due to the severe compression deformation. Therefore, necking from a larger diameter to a smaller diameter often requires multiple neckings


Post time: May-31-2020
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