manual freze wirtgen
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DESCRIPTIONManual de exploatare a frezelor de asfalt Wirgen
Cold milling machines
Calculating the working performance
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0 500 1000 1500 2000 2500
Most common working range
2 // 3
Purpose of this brochure 4
How to use this brochure to determine the performance values 6
Performance diagrams and sample calculations for:
Cold milling machine W 350 8
Cold milling machine W 35 10
Cold milling machine W 35 DC 12
Cold milling machine W 500 14
Cold milling machine W 50 16
Cold milling machine W 50 DC 18
Cold milling machine W 600 DC 20
Cold milling machine W 1000 L 22
Cold milling machine 1000 C 24
Cold milling machine W 1000 26
Cold milling machine W 1000 F 28
Cold milling machine W 1200 F 30
Cold milling machine W 1300 F 32
Cold milling machine 1300 DC 34
Cold milling machine 2000 DC 36
Cold milling machine W 1500 38
Cold milling machine W 1900 40
Cold milling machine W 2000 42
Cold milling machine 2100 DC 44
Cold milling machine W 2100 46
Cold milling machine W 2200 48
the machine parameters
the material parameters
the site conditions
the traffic situation
the transport capacity for transport of the milled material
the experience of the operating staff.
This brochure has been compiled on the basis of Wirtgens
decades of know-how and customers practical experience
in the field, in order to provide the user with a useful tool for
calculating the working performance of his machines.
The output of a milling machine in practice depends on numerous influencing factors. The most important of these are:
Purpose of this brochure
This brochure presents performance diagrams of the
Wirtgen milling machines, as determined in extensive
test series involving the milling of asphalt pavements in
These performance diagrams are supplemented by
mathematical formulas which allow the determination
of the area output achieved in practical site operations.
With the aid of this tool, the user can roughly calculate the
hourly or daily output to be expected of his machine.
However, a few assumptions first have to be made, which
have an effect on the result. The users experience in
correctly estimating the prevailing local conditions is of
particular importance in this context.
Despite the good applicability of the diagrams, formulas
and values given, Wirtgen GmbH cannot accept any liability
in relation to the calculation methods. All figures are for
information only and not binding. No part of this brochure
may be reprinted or duplicated.
Milling of complete asphalt pavements in asingle operation.
The heart of the milling machine: the milling drum of a high-capacity machine with easilyreplaceable milling cutters and patented HT3 Plus interchangeable toolholder system.
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VorschubV (m/min)theoretischeFlchenleistungFT (m
5 // 54 // 5
Working width Asphalt/Concrete Milling depth Cordoned-off site Number of trucksExperienced/inexperienced
Engine output Type of rockhard/softUnobstructed
area Obstacles Organisation
Weight Grain shaperound or broken Partial repair work Traffic situation
Cutting speed Grain distributionInfluencing factorsobstructing work
Type of cuttingtool, spacing
Type of binderhard/soft
Travel drive Crawler track/wheel Temperature
Factors influencing the milling output
With the aid of this brochure, you can find the right machine for every job. This guaranteesmaximum economy and rapid site completion.
Highly manoeuvrable small milling machinesreduce the amount of re-work required.
How to use this brochure to determinethe performance values
1. Selecting the type of machine
The type of machine to be used for a construction job has to
be selected first, so that its performance data can be deter-
mined. A total of 21 different types of machines both from
Wirtgens current range and older models are available for
this purpose in this brochure.
2. Determining the theoretical area output from
Starting with the selected milling depth and the assumed
pavement hardness (N.B.: This has a major influence on the
milling output!), the rate of advance in m/min and the asso-
ciated theoretical area output in m2/h are determined from
the appropriate diagram. If the probable pavement hardness
is not known, it may be advisable to carry out the calcula-
tions below using different assumed values.
3. Determining the allowance factor
The allowance factor must now be determined for the
construction project to which the calculations apply. These
factors are listed both for work in built-up areas and for work
in open country. These values are not fixed, but usually vary
within a certain range.
The following facts may considerably reduce the
performance in practice:
Long delays waiting for trucks
Several, separate areas to be milled, requiring repeated
transfer of the machine
Traffic impeding the milling work
Obstacles in the road (manhole covers, hydrants, gas
and water valves, rainwater inlets, etc.)
Winding roads, uphill and downhill work, etc.
Other factors obstructing the work or unavoidable
Under certain circumstances, it may be useful to perform
the calculations using two different allowance factors.
4. Calculating the practical output data
The practical milling output, the reclaimed quantities and
volumes, and also the working time required, can now be
calculated with the aid of the formulas given here.
Two complete typical sample calculations are included
for each of the 21 types of machine, in order to explain the
procedure. These examples apply when milling asphalt
pavements at a ground temperature of approx. 15 C.
6 // 7
The high output of the milling machine requires the availability of sufficient truck capacity to take away the reclaimed material. Calculatingthe milling output permits accurate estimation of the volume of reclaimed material, resulting in highly economical operations.
Additional points to be considered:
Temperature of the pavement to be milled
In practice, the achievable milling output essentially
depends, among other things, on the temperature of the
pavement. In this context, the values given in this brochure
refer to a ground temperature of approx. 15 C.
The binder (bitumen) becomes softer at higher temperatures.
The result is an increase in the milling output, as the entire
pavement can be detached more easily and the milling
machine encounters less resistance. The reverse applies at
lower temperatures, in which case a lower practical milling
output must be expected.
As a mathematical rule-of-thumb, it can be anticipated
that roughly 60 % of the listed output can be achieved at
a ground temperature of 0 C. In contrast, 1.3 times the
practical milling output can be expected at a ground
temperature of 30 C:
0 C: Area output at 0 C = 0.6 x Area output
30 C: Area output at 30 C = 1.3 x Area output
at 15 C
To be calculated differently:
Milling of concrete surfaces
The calculations and examples presented in this brochure
refer exclusively to the milling of asphalt surfaces. The use
of the curves is limited to making estimates when milling
concrete. To this end, the value for the theoretical area
output when milling hard asphalt must be multiplied by a
factor of 0.3. This gives a rough estimate of the practical
milling capacities to be expected when milling concrete.
When milling concrete, there is no need for the approximate
calculation to include any temperature influence on the
Moreover, when milling concrete, it must also be borne
in mind that the theoretical milling depth of the type of
machine involved cannot be exploited to such a great
extent as when milling asphalt.
Cold milling machine W 350
Calculation of the practical area output FP:
Calculation of the practical reclaimed volume QV:
Calculation of the practical reclaimed quantity QT:
Calculation of the total reclaimed volume for the job QGV:
Calculation of the total reclaimed quantity for the job QGT:
Calculation of the working time required for the job Z:
Engine output ................................................. 42 kW/56 HP/57 PS
Milling width .................................................................................. 35 cm
Milling depth ............................................................................ 010 cm
FP (m2/h) = A x FT
QV (m3/h) = FP x T x 0.013
QT (t /h) = FP x T x 0.024
QGV (m3) = FF x T x 0.013
QGT (t) = FF x T x 0.024
Z (h) = FF/FP