There are many types of products in the mold industry, of which the stretch mold is one of the higher technical content. The reason why the drawing mold is difficult is that 1, the calculation of the design, and the test work 2 after the mold design is completed.
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Continuous Drawing Die
Translated by Jasmine HL
There are many types of products in the mold industry, of which the stretch mold is one of the
higher technical content. The reason why the drawing mold is difficult is that 1, the calculation of
the design, and the test work 2 after the mold design is completed.
For designers, in order to design a reasonable tensile mold structure, they must accumulate
considerable design experience.
The qualification of the tensile part is not related to the material itself. The choice of the press
cannot be related, and the lubricant is also an important factor:
Stretch selection
08 steel is the main representative. Generally, the cold die series such as 08Al, 08, 08F, 10, 15, 20
are used for the drawing die. For the designer, a reasonable selection of materials has made the
die half successful.
2. Calculate opening size
For rotating bodies and cylindrical deep-drawn parts, the calculation method of the opening size
is based on the principle that the volume of the material is unchanged. Even if the material
becomes thin during the stretching process, the total volume will not change.
The calculation method for drawing products with complex shapes will be more troublesome
because the shape is also accompanied by changes in material thickness. Even if there is 3D
software and simulation analysis software to aid the calculation, it is difficult to achieve the
expected material opening effect.
To get the right cut size. Only the cutting edge can be used to determine how much material is
needed, and then the structure of the tensile mold is designed to make continuous attempts.
Stretch factor
How many steps are needed to stretch the product? The stretching height and size of each step
are calculated by the stretching coefficient. The stretching structure and process are different,
and the stretching system is different. Therefore, it is necessary to make a reasonable selection
according to the actual product.
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mingfeng425@gmail.com
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4. The main factors affecting the tensile coefficient:
1). Mechanical properties of the material (falling strength --- elastic deformation; tensile strength
--- plastic deformation; elongation coefficient; section shrinkage).
2). The relative thickness of the material.
3). A number of stretching.
4). Stretching method.
5). Corner radius of the convex and concave die.
6). The smoothness and lubrication conditions, clearances, etc. of the stretched working surface.
7). Stretching speed.
If cracks appear in the test mold, you can try to apply a little lubricant (rapeseed oil, soapy water)
to the lower mold or cover a layer of film on the surface of the concave mold to achieve a certain
effect.
Proper annealing and heat treatment can improve the plasticity of the material, which can
reduce the parts that are stretched multiple times. After each stretch, the phenomenon of
hardening will occur, and the plasticity will be prone to various stretching problems.
