BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

52 Silviu Berbinschi et al
2.1.2. Mechanism assembling and the creation of kinematics couples. In the
assembly
file GenCremaliera are inserted all the above described elements,
with the command Insert Existing Component.
These have geometrical and dimensional constraints in order to be
positioned in accordance with the mechanism functionality. After inserting the
constraints, the GenCremaliera contain the whole mechanism in the initial
position. In the Assembly environment the mechanism elements were positioned
but doesn’t exist yet any couple between them.
The kinematics couples are created in the DMU Kinematics environment. It
is created the mechanism named Generare.Scula.Cremaliera and is established
the standing element, Baza.
After the kinematics couples creation the mechanism function may be
simulated and look as in figure 2.
2.1.3. Mechanism rolling and determination of tool’s profile. In order to
rolling
this mechanism is created a simulation with command Simulation and
are established the intermediate position number, Shot, number which will have
influence to the tool’s profile precision. For this example we considered 500
steps, so it will result 500 points. With this simulation is determined the tool’s
profile, see Figure 3.
0
1
2
3
4
5
6
7
ζ
η
Fig. 3 – Tool’s profile in the rack-gear reference system.
2.1.4. Points coordinates extraction. After the determination of the tool’s
profile, these may be exported in a text file using the command Design Table,
from the Part environment.
This command will generate a text file PuncteProfil.txt, see Table 1.