Start of Operations
If the stops included in the delivery are insufficient or are damaged
during processing, they can be ordered as spare parts (> see the
chapter “Spare and Wearing Parts”).
7.3.2 Calculating the Clamping Force
It is not possible to specify any general clamping forces for Matrix-
Plates. Actual values can deviate from theoretical values, and vary
greatly from application to application.
The following example calculation shows how holding forces are
generated and the parameters on which they depend.
The normal force acting on the workpiece during clamping
depends on the clamping area and the vacuum or pressure
difference. Both the vacuum level and the clamping surface should
be maximized as far as possible.
Therefore, the following applies:
The aim is always to achieve the
highest possible vacuum.
Example calculation:
P = pressure [N/mm
2
]
F = force [N]
A = area [mm
2]
µ = static friction coefficient (dependent on the material pairing
and surface quality)
A rectangle measuring 300 x 200 mm has a theoretical suction
area of 60,000 mm
2
.
If the system has a vacuum of -0.8 bar (=0.08 N/mm
2
), the formula
p = F / A ==> F = p * A
gives a theoretical normal/suction force of:
F
N
= 0.08 N/mm
2
* 60,000mm
2
F
N
= 4,800 N
The horizontal friction force can then be determined using the
formula
F
R
= µ * F
N
With an assumed value for µ=0.21 (guide value for aluminum on
aluminum, guide value for steel on aluminum = 0.19), the normal
force calculated above results in a friction force (horizontal force)
of:
F
R
= 0.21 * 4,800 N = 1,008 N
Note:
The specified values are intended purely as examples for the
calculation.
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01 | Matrix-Plate SMPL | Assembly- and Operating Manual | en-US | 0489081
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