The first step of drawing die design is to calculate the material development size of the product, mainly according to the law that the total volume of the material is constant. That is to say, the product is calculated based on the surface area of the product, and the expanded size is calculated as follows:

The material development formula of the drawing die round product, the development dimension of the drawing part with the right outer diameter of 50mm and the height of 60mm and the material thickness of 1.0 is calculated as follows:

√( 50 * 3. 14 * 60)+(50 * 0.5)*(50 * 0.5)* 3. 14 * 2 =φ 120mm

The developed size calculated by this formula is basically close to the actual material size. (Note of formula: diameter D*π* height H= cylindrical surface area of product, square of r * π = bottom area, and the sum of two terms divided by π and then squared = product radius *2 is approximately equal to the developed outer diameter of product).

In practical application, the trimming margin can be appropriately increased by 1mm in height, so it needs (50*3. 14*6 1). If non-trimming stretching still requires material thinning, it requires pressing (50*3. 14*59.5), regardless of the product surface.

Extended data:

The drawing model usually refers to various dies for drawing metal wires and optical fibers. All drawing dies have a hole with a specific shape in the center, such as circle, square, octagon or other special shapes. When the metal is pulled through the die hole, its size becomes smaller and even its shape changes.

In principle, the drawing process of the square product of the drawing die is also the process of drawing a circle first and then turning it into a square, so this formula can be applied. Square products are also round cuboids: length 100* width 60* height 30. First of all, we calculate the cutting size as φ 1 12 40mm according to the cube of 60*60, and put this 65438.

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