module supporting system EDMS 1158277 General principle Main inputs an requirements Suggested solutions for the alignment Assembling Conclusion Cradles design for CLIC module supporting system ID: 251261
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Slide1
Cradles design for CLICmodule supporting system(EDMS 1158277)
General principleMain inputs an requirementsSuggested solutions for the alignmentAssemblingConclusionSlide2
Cradles design for CLICmodule supporting system
General principle
Girders
Cradles
Articulation points
Standard
active
motion
devices
Modules trains (principle, different length...)
Improvement of an existing device
Cradles(interface) and articulations point (degrees of freedom) are in-between girders
Considerations: rigid girders, Vs exists and are well aligned...=> Cradle and articulation point are important components
(...)
(...)
Isolated
active
motion
devices
Beam axleSlide3
Cradles design for CLICmodule supporting system
Main inputs and requirements
Beam alignment accuracy (±20µm)
Radial and
longitudinal
efforts (500N)
Girders
short
space,
material, manufacturing, tolerances?
Environment compact assembly (Height, widthDisplacement ranges (
ΔZ= ΔX= ±3mm, ΔY= ±0.4mm)Weight
(max. 4000N/m)Assembling modular and simpleActuators overall volumeSlide4
Cradles design for CLICmodule supporting system
General principle
(zoom on the articulation point principle)
Objective: beam axle = beam axle
Girder sub-assembly
Articulation
sub-assembly
Girder sub-assembly
No adjustment device in-between 2 girders
We need to have less sub-assemblies as possible.
Inside sub-assemblies, all red references should be well aligned together! Slide5
Cradles design for CLICmodule supporting system
General principle
(Girder sub-assembly)
Accuracy not easy to obtain but the problem can be skirted
around by
using
shims
Machining
Accuracy OK
Objective: V supports references and holes must be well positioned between them
Red references are important
<->Metrological control needed!
Beam axleSlide6
Cradles design for CLICmodule supporting system
General principle
(Articulation sub-assembly)
Objective: up and downstream holes must be well aligned.
<-> We assemble the 3 parts and we do the final drilling
Accuracy is OK (+/-0.01mm)
After that the 3 components of an articulation sub-assembly must stay together!Slide7
Cradles design for CLICmodule supporting system
Suggested solutions for the active alignment
Rectangular trapezium principle
45.5mm
3mm
0.1mm
(second-rat motion)
Degrees of freedomSlide8
Cradles design for CLIC
module supporting systemSuggested solutions for the active
alignment
Flexible components (blades) are used for kinematic pivot connections where we usually need standard pivots components
Example:
-Blue square shape fixed
-Red square shape connected to the cradle
-70N radial force (2x for trapezium)
-4000N vertical force
-2.1mm radial displacement
-750N/mm2 maximum stress in blades
-Vertical movement is less than 0.05mm
(compensated by the actuators)
Advantages:
-High precision
-No
Friction (
no stick-slip/Forces instantaneous transmission)-Good repeatability, suppression of the clearance
and the hysteresis phenomenon-Monolithic componentSlide9
Cradles design for CLICmodule supporting system
Suggested solutions for the active alignment
Articulation device: 3 parts assembly
Extension area
Compression area
Stress with total load+1º flexion~650N/mm2
Degrees of freedom
Beam axle
Total extension with 4000N load =17µmSlide10
Cradles design for CLICmodule supporting system
Suggested solutions for the active alignment
Fitting cradle-girder
Beam
ShimsSlide11
Cradles design for CLIC
module supporting systemSuggested
solutions
for active alignment
Radial flexible component
Longitudinal
flexibles
componentsSlide12
Cradles design for CLICmodule supporting system
Assembling(Suggested sequence)
Male articulation unit
Female articulation unit
Girder longitudinal sliding
Girder vertical moving down
Screwed fastening
Pre-alignment ±0.2mmSlide13
Cradles design for CLICmodule supporting system
Assembling
(details)Slide14
Cradles design for CLIC
module supporting systemAssembling(Module removing)
Articulation disconnection (2x)
Vertical
actuators+supports
have to be removed (2x)
Auxiliary supportSlide15
Cradles design for CLICmodule supporting system
Conclusion(N
eeds,
constaints
and suggestion)
20µm expected precision
should be
reached
Cradles have to
be considered
as an integral parts of a girder
System compatible with Boostec and Epucert girders
Accurate machiningSpecific material usingMeticulous of pre-assemblingPre-alignment importantDifficulties to reduce the overall dimensionsGap in-between girder very short
Weight variation is a very high constraint (vertical compensation?)