It is a forming processing method to apply external force to sheet, strip, pipe and profile through punch and die to produce plastic deformation and press bearing or separation, so as to obtain workpieces of required shape and size. The workpieces obtained are stamping parts.
Stamping bearing is a forming and processing method of workpieces (stamping bearing stampings) of required shape and size, which are obtained by applying external force on plates, strips, pipes and profiles by press and die to cause plastic deformation or separation. Stamping and forging belong to plastic processing (or pressure processing), which is called forging. Stamped blanks are mainly hot-rolled and cold-rolled steel plates and strips. In the world, 60~70% of steel products are plates, most of which are finished products after stamping. The car body, chassis, fuel tank, radiator sheet, boiler drum, container shell, motor, electrical iron core silicon steel sheet, etc. are all processed by stamping. Instruments, household appliances, bicycles, office machinery, household utensils and other products also have a large number of stamping parts.
Compared with castings and forgings, stamping bearings are thin, uniform, light and strong. Stamping can produce workpieces with stiffeners, ribs, undulations or flanging that are difficult to manufacture by other methods to improve their rigidity. Due to the use of precision die, the precision of the workpiece can reach the micron level, and the repetition precision is high, the specification is consistent, and the holes and sockets, bosses, etc. can be punched.
Stamping bearings are generally no longer subject to machining, or only require a small amount of machining. The precision and surface condition of hot stamping parts are lower than those of cold stamping parts, but they are still better than castings and forgings, with less machining.
Stamping is an efficient production method. Using compound die, especially multi position progressive die, multiple stamping processes can be completed on one press to realize fully automatic production from strip uncoiling, leveling, blanking to forming and finishing. High production efficiency, good working conditions, low production cost, generally hundreds of pieces can be produced per minute.
Stamping is mainly classified by process, which can be divided into two categories: separation process and forming process. The separation process is also called blanking, which aims to separate the stamping parts from the sheet metal along a certain contour line and ensure the quality requirements of the separation section. The purpose of the forming process is to make the sheet metal plastic deformation under the condition of not breaking, and to make the workpiece of the required shape and size. In practical production, many processes are often applied to a workpiece. Blanking, bending, shearing, drawing, bulging, spinning and straightening are several main stamping processes.
The surface and internal properties of the sheet metal used for stamping have a great impact on the quality of the finished stamping products. It is required that the thickness of the stamping material be accurate and uniform; The surface shall be smooth and clean without spot, scar, scratch, surface crack, etc; The yield strength is uniform without obvious directivity; High uniform elongation; Low yield ratio; Low work hardening.
The stamping bearing is generally composed of an inner ring, an outer ring, a stamping body and a cage.
The role of the inner ring is to match the shaft and rotate with the shaft; The outer ring plays a supporting role by matching with the bearing seat; The stamping body is evenly distributed between the inner ring and the outer ring with the help of the cage. Its shape, size and quantity directly affect the service performance and life of the stamping bearing; The cage can make the stamping body evenly distributed, prevent the stamping body from falling off, and guide the stamping body to rotate for lubrication. Function: The stamping bearing is easy to use and maintain, reliable in operation, good in starting performance, and high in bearing capacity at medium speed. Compared with sliding bearings, stamping bearings have larger radial dimensions, poorer damping capacity, lower life at high speed, and greater noise.
