2013年5月23日星期四

Watch sheet metal bending dies for fitting bezel on watch


To produce different materials made of precision sheet metal, it is needed to give it different shapes. For giving different shapes to a precision sheet metal it has to be bent. Without bending it is impossible to produce any materials. Sheet metal, a thin and flat sheet, has enormous uses in various industries both as construction and raw material. The process of making sheet metal useable in different industries is known as sheet metal engineering. Forming, cutting and finishing are the three primary steps of sheet metal engineering. Every sheet metal has to go through these three processes and after these they are ready to use in the required industries.

Bending is a manufacturing process by which a sheet metal can be deformed to fitting bezel on watch and change its shape. The metal is stressed above its own yield strength but just below its highest tensile strength. In bending, refers to the deformation about one axis only, there is little change to the material surface area.


Sheet Metal Bending Dies is secured between clamps and stretched over a block form in the stretch forming process. In bending sheet metal is bent not only along a straight line, but also along a curved path. In depth drawing process the depth of the part being made is more than half its diameter. The process of creating raised and smooth designs, by means of matched female and male roller dies or by passing a strip of metal between rolls of the sought after pattern, on sheet metal is known as embossing. Bulging process is used to create different shells like pyramidal shells, shells of pyramid frustums, shallow pans and embossed panels. In roll forming a sheet of metal is passed through continuous sets of stands or rolls to get the sought after cross-section profile. A tube or disk of metal is spun at a very high speed and formed into a symmetrical part in the spinning process.

Different shapes can be produced in bending by using standard die sets or bend brakes. By using die sets materials are given v-shape and by using press brakes a number of shapes can be given to the materials. In this process a backing pad is used to force the contacting with the punch bottom and this process is performed when two parallel bending axis are produced in the same operation.


In this process the sheet metal is bent on one edge to 900. By the stroke position of the punch the flange length can be easily changed and the bend angel can be easily controlled. It is also known as flanging. When two acting operations are done on the work piece one after another then it is called double die bending. It can reduce spring back by enhancing strain hardening.

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