In this process, many parameters such as friction, drawing ratio, quality and type of die and sheet, blank holder
force, drawing speed, mandrel head radius, and matrix edge is involved.
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Capacity in Mechanical Engg.
In , the sheet forming simulation of rectangular box was conducted and the method of determining VBHF (variable blank holder
force) were proposed based on the displacement in the Z direction of blank holder
While the later, mostly the problem of sheet thickness, friction coefficient, blank holder
force, tool geometry, contact pressure, temperature and unloading procedure were discussed (Li et al.
force optimization of hemispherical product using numerical simulation.
This pressurized fluid is directed to the peripheral surface of the blank through the bypass holes and also this high pressure fluid leak out between the blank and both the blank holder
For the direct analysis method that was employed, it was necessary to model the die, the punch and the blank holder
and to introduce the contacts and frictions between the active elements and the blank.
Techniques must be developed to properly design the blank holder
to avoid the leakage.
The blank holder
can be improved substantially by equipping the knuckle-joint press with a servo-acting draw cushion.
Of 60 Tons Capacity(Double Acting) Hydraulic Press With Blank Holder
, In Tooled Up Condition.
Variable tribological conditions on the blank holder
as significant factor in deep drawing process.
This not only takes into account the physical attributes of the forming operation (the plasticity of the material, the blank holder