Stamping (also known as pressing) is the process of placing flat sheet metal in either blank or coil form into a stamping press where a tool and die surface forms the metal into a net shape. Due to the use of precision die, the precision of the workpiece can reach micron level, and the repetition precision is high and the specification is consistent, which can punch out the hole socket, convex platform and so on. Stamping includes a variety of sheet-metal forming manufacturing processes, such as punching using a machine press or stamping press, blanking, embossing, bending, flanging, and coining.[1] This could be a single stage operation where every stroke of the press produces the desired form on the sheet metal part, or could occur through a series of stages. Progressive dies are commonly fed from a coil of steel, coil reel for unwinding of coil to a straightener to level the coil and then into a feeder which advances the material into the press and die at a predetermined feed length. Depending on part complexity, the number of stations in the die can be determined.
1.Types of stamping parts
Stamping is mainly classified according to the process, which can be divided into two categories: separation process and forming process.
(1)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 separation section.
(2)The purpose of the forming process is to make the sheet metal plastic deformation without breaking the blank to make the desired shape and size of the workpiece. In actual production, a variety of processes are often comprehensively applied to a workpiece.
2.Characteristics of stamping parts
(1)The stamping parts have high dimensional accuracy, uniform size and good interchangeability with the die parts. No further processing is needed to meet the general assembly and use requirements.
(2)Generally, cold stamping parts are no longer machined, or only a small amount of cutting is needed. The precision and surface state of hot stamping parts are lower than those of cold stamping parts, but they are still better than castings and forgings, and the amount of cutting is less.
(3)In the stamping process, because the surface of the material is not damaged, it has good surface quality and smooth and beautiful appearance, which provides convenient conditions for surface painting, electroplating, phosphating and other surface treatment.
(4)The stamping parts are made by stamping under the premise of low material consumption, the weight of the parts is light, the stiffness is good, and the internal structure of the metal is improved after plastic deformation, so that the strength of the stamping parts is improved.
(5)Compared with castings and forgings, stamping parts have the characteristics of thin, uniform, light and strong. Stamping can produce workpieces with convex ribs, ripples or flanging to improve their rigidity. These are difficult to make by other methods.
Post time: Jul-28-2022