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Stamping bearing concept clarification
Source: China Bearing Network Time: 2013-05-10
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The stamping bearing is an external force applied to the plate, strip, pipe and profile by the press and the die; the plastic deformation or separation is caused by the press; and then the forming process of the workpiece (the stamping bearing stamping part) of the desired shape and scale is obtained. And casting is the same plastic processing (or pressure processing); collectively forging. Stamping blanks are mainly hot-rolled and cold-rolled steel and steel strips.
Among the world's steel products; 60 to 70% are sheets; most of them are made by stamping. The body, chassis, fuel tank, radiator sheet of the automobile; the steam drum of the boiler, the casing of the container, the motor, and the electrical appliance. Iron core silicon steel sheets are all stamped and processed. Instruments, household appliances, bicycles, work machines, day vessels and other products; there are also many stamping parts.
Stamping bearings are compared with castings and forgings; they are thin, uniform, light and strong. Stamping can produce workpieces with ribs, ribs, rugged or flanging that are difficult to manufacture by other methods; to improve their rigidity. Mold; the accuracy of the workpiece can reach micron level; and the repeating precision is high, the standard is common; the hole, the boss and so on can be punched out.
Stamping bearings are usually no longer machined; or only a small number of cutting processes are required. The accuracy and appearance of hot stampings are lower than that of cold stampings; but they are still superior to castings and forgings;
Stamping is an efficient production method; the composite mold is selected; especially the multi-station progressive die; multiple stamping processes can be completed on one press; the end is completed by unwinding, leveling, punching, forming, finishing Proactive production. High production efficiency; good working conditions; low production costs; usually hundreds of pieces per minute.
Stamping is mainly classified according to the process; it can be divided into two categories: separate process and forming process. The separate process is also called punching; its intention is to make the stamping part separate from the sheet along a certain contour; together to ensure the quality requirements of the section. The purpose of the forming process is to cause the sheet to plastically deform without breaking the blank; to produce the workpiece of the desired shape and size. In practice; often a variety of processes are applied to a workpiece. Blanking, zigzag, shear Cutting, deep drawing, bulging, spinning, and correction are several primary stamping processes.
The appearance and intrinsic function of stamping sheet have great influence on the quality of stamping products; the thickness of stamping materials is accurate and uniform, and the appearance is smooth and clean; no spots, no flaws, no scratches, no appearance cracks, etc., uniform yield strength; no significant Directional, high uniform elongation, low yield ratio, low work hardenability.
In practice production; commonly used process experiments similar to the stamping process; such as drawing function test, bulging function test and other inspection data stamping function; to ensure product quality and high pass rate.
The precision and layout of the mold directly affect the forming and precision of the stamping parts. The cost and life of the mold are important factors affecting the cost and quality of the stamping parts. The time of mold design and production is more demanding; this extends the production of new stamping parts. Preparation moment.
Standardization of mold bases, mold bases, guides and development of simple molds (for small batch production), composite molds, multi-station progressive molds (for many production); and research and development of rapid mold change equipment; Quantity and shorten the preparation time; can be applied to reduce the amount of preparatory work for stamping production and shorten the preparation time; can make the leading stamping skills suitable for mass production reasonably applied to small batches of various types of production.
Stamping equipment is not only formed by thick plate hydraulic press; mechanical presses are usually used. The modern high-speed multi-station mechanical press is the middle; equipment such as unwinding, leveling, product collection and transportation, as well as mold and rapid changeover Equipment; and use computer program control; can form a high-yield active stamping production line.
In the case of producing dozens or hundreds of stampings per minute; in the short time, the process of feeding, stamping, unloading, discharging waste, etc.; often causing personal, equipment and quality accidents. Therefore; safe production in stamping Is a very important problem.
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