Transcript Section 5.3 - Fabrication Assembly Plans

GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
GLAST Large Area Telescope:
Mechanical Systems Peer Review
March 27, 2003
Section 5.3 – Fabrication &
Assembly Plans
Bill Olson
SLAC
Mechanical Engineer
[email protected]
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Topics
Agenda
• Procurement plans
– Identify critical component need dates vs. delivery dates
– Summarize procurement contract status
– Long lead part requirement/procurement
• Fabrication plans
– Mech Parts and Materials plan
– Material approval status/readiness
• Assembly plans
– Assembly sequence
• MGSE
• Performance and Safety Assurance plans
• Further Work
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Procurement Plans
• RFP for 4 x 4 Grid & Grid Box Machining
– Issue by 4/21/03
– Place contract by 5/15/03
• Long Lead Materials
– PR for 2 Grid billets is in process now
– Lockheed has ordered heat pipe extrusions
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Mechanical Parts & Materials Plan
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Material requirements flow down from the Mission Assurance
Requirements 433-MAR-0001 and the Mechanical Parts Plan LAT-SS00107-01.
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LAT Material selection of low outgassing and flight heritage
• Outgassing specs: TML < 1%
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CVCM < 0.1%
Important Procedures and Guidelines for Material selection
• Fastener Integrity Requirements (541-PG-8072.1.2)
• Metallic Materials for Stress Corrosion Cracking Resistance in
Sodium Chloride Environment (MSFC-STD-3029)
• Standard Test Method for Total Mass Loss and Collected Volatile
Condensable Materials for Outgassing (ASTM-E-595)
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Mechanical Parts & Material: Status
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Submitted to SLAC IPO as of 3/19/03
Inorganic
Submitted
80
SLAC IPO
Accepted
68
GSFC
Approved
68
Need more
info.
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Polymer &
Composites
Lubricants
Processes
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4
10
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4
10
22
4
10
1
0
0
Total
117
104
104
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Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Box Assembly Overview
Grid Assy
Grid
Grid Box Base
Assy
Grid Box Assy
Ready for Test
Radiator Mount
Bracket
Spacecraft
Interface (Wing)
EMI Skirt Details
Heat Pipe Patch
Panels
X-LAT Plates
Heat Pipes
Purge Groove
Cover
Legend
Accepted Hardware
CAL Plates
(Temporary)
Grid Box Assembly
Configuration
Test activity
Assembly activity
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Assembly
The Grid Assembly consists of;
• 4 x 4 Grid
• Spacecraft mounting interface (Wing) which is located at the
bottom center of each side of the Grid
• Radiator Mounting Brackets - 2 as shown and 2 opposite.
Radiator Mounting Bracket
Document: LAT-PR-0XXXX
Grid Assembly
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Box Base Assembly
The Grid Box Base Assembly is the next level assembly, and is
the configuration delivered to I&T. It consists of:
• Grid Assembly
• Heat Pipe Patch Panels, 2 as shown and 2 opposite
• Heat Pipes
– 5 Top Flange Heat Pipes (TFHP)
– 12 Downspout Heat Pipes (DSHP)
• 2 Purge groove covers
• Flight heaters, thermostats &
thermistors on Grid
Once this assembly is put
together, it is not intended
to be taken apart.
Grid Box Base Assembly
Heat Pipe Patch Panel
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Box Assembly
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The Grid Box Assembly is the
Mechanical Systems’ top assembly
test configuration. It consists of:
Grid Box Base Assembly
Remaining EMI skirt parts
– 4 Center EMI Shields
– X-EMI Shields, 2 as shown and
2 opposite
Grid Box Assembly
2 X-LAT plates with heat pipes
X-LAT Mid-plate
16 Temporary Calorimeter plates.
X-EMI Shield
Center EMI Shield
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Fabrication Plan
The Grid is a complex machined part that requires special
consideration and handling. Tapemation outlined their plan,
which basically is;
• Rough mill, leaving approximately 0.200” extra all around
• Heat treat to remove stresses and temper to T6 condition
• Face Datum-A and the opposite side to 0.100” away from the
finished surfaces
• Mill all four sides to approximately +0.100”
• Stress relieve
• Finish mill inside (bay) features from Datum-A side
• Finish mill all four sides
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Fabrication Plan (Cont)
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Finish mill all features on side opposite Datum-A
Finish drilling, tapping, and all other features on Datum-A side
Finish mill Datum-A surface
Deburr and clean part
Inspection – Coordinate Measurement Machine (CMM)
Alodine
Install all inserts and hardware
Perform proof load test on inserts
Ready for Grid Box Machining.
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Fabrication
Grid
Procure
aluminum
NDT plate
(x-ray, UT, other)
Rough
machine Grid
Stress-relieve
heat treat
Finish machine
Grid
Remove, mach
test samples
Test samples
Clean Grid
Repair as
required
Inspect Grid
Inserts
Procure inserts,
mount h’ware
Alodine
Install inserts
Proof inserts
Ready for Grid
Box Machining
SLAC Buy-off
Final Inspection
Legend
Fabrication activity
Inspection/test
Assembly activity
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Box Machining
• Grid Box Machining is a temporary assembly for machining:
– EMI shields coplanar for X-LAT plate mounting
– Each pair of Radiator Mounting Brackets coplanar
– Control relative positions of Radiator & X-LAT locating pins
to Grid datum’s so 3 sets of heat pipes will mate properly
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Install the EMI Skirt components on Grid
Machine bottom edges of the EMI Skirt
components co-planer
Machine X-LAT locating pin holes and
fastener holes in the EMI Skirt
components
Machine mounting features & locating
pins holes in Radiator Mounting Brackets
Install locating pins and Helicoils
Mark parts for specific location on Grid
X-LAT Pins
Radiator Pins
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Box Machining
EMI Skirt
Grid
Procure
aluminum
Grid
Machine
Radiator Brkts
Machine Patch
Panels
Clean EMI Skirt
Components
Inserts
Procure inserts,
mount h’ware
Machine Center
EMI Shields
Machine X-EMI
Shields
Install inserts in
EMI Skirt Parts
Inspect
Repair as
required
Install Radiator
Brkts, Patch
Panels, Center
EMI Shields, &
X-EMI Shields
on Grid
Repair as
required
Inspect
Clean Assy
Drill Pin and Bolt
Holes in EMI
Skirt Parts &
Radiator Brkts
Machine Radiator
mounting surface
features in Radiator
Brkts
Machine EMI
Skirt Co-planer
Legend
Install inserts in
EMI Skirt Parts
Deliver To SLAC
Fabrication activity
Inspection/test
Assembly activity
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Assembly Procedure
The Grid Assembly is assembled per the following procedural
steps:
• All components are inspected, cleaned, bagged, and staged
when received. This is true for all components that make up
the Grid Box Assembly
• Lay Grid top side down on a flat table
• Install Spacecraft wings
• Install the Radiator Mounting Brackets
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Box Base Assembly Procedure
The Grid Box Base Assembly is the core assembly, and is not
intended to be disassembled below this level. The
procedural steps are;
• Leave the Grid Assembly top side down
• Install the Heat Pipe Patch Panels so the Downspout Heat
Pipe mounting surfaces on the Grid and Patch Panels are
co-planer
• Turn the Grid Assembly top side up
• Locate the Downspout Heat Pipes (DSHP) relative to
Radiator locating pins with tool
• Bond the DSHPs to Grid
• Bond Grid Top Flange Heat Pipes into Grid
• Bond the Purge Groove Cover Plates.
• Install flight heaters, thermostats, & thermistors to Grid
• Wire heaters, thermostats, & thermistors
• Attach the Grid Perimeter Ring, which is for handling the
LAT during all phases of operation, other than flight, to make
handling the assemblies easier and safer.
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Grid Box Assembly Procedure
The Grid Box Assembly is the final assembly level for Mechanical
Systems. The procedural steps for assembly are;
• Place the Grid Box Base Assembly top side down
• Install temporary Calorimeter plates
• Install the Center EMI Shields
• Install the X-EMI Shields
• Mount the X-LAT plates on the EMI Shields and fasten the heat
pipes to the Patch Panels
• Mount the X-LAT Mid-plate on the EMI Shields.
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Mechanical Systems MGSE
Item
Grid Box Assembly Stand
Grid Box Assembly Lifting Sling
GBA Static Load Test Fixtures
Dummy CAL baseplates for SLT
LM Provided MGSE
Radiator Lifting Sling
X-LAT & Mid-Plate Lifting Sling
LAT Mass Simulator
Document: LAT-PR-0XXXX
Qty Function
1 Assemble Grid Box Assy
1 Handling Grid through GBA
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1 Lifting & handling
1 Lifting & handling
1 for Radiator thermal balance test
Status
Concept
Concept
Concept
Mod Rel Dwg
Concept
Concept
Concept
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Performance Assurance System
• Mechanical Systems will comply with the following:
– LAT Performance Assurance Implementation Plan (PAIP),
LAT-MD-00039
– LAT Quality Manual, LAT-MD-00091
– Configuration Management Plan, LAT-MD-00068
– Instrument Performance Verification Plan, LAT-MD-00408
– Calibration Program, LAT-MD-00470
– System Safety Program Plan (SSPP), LAT-MD-00078
• Additionally, above requirements have been flowed down to
Suppliers and Subcontractors.
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Further Work
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Finalize Wing design
Finalize Spacecraft Mount configuration with Spectrum
Optimize stress and mass of EMI Skirt components
Detail design of assembly MGSE
Get Grid vendor under contract
Document: LAT-PR-0XXXX
Section 5.3 Fab & Assy Plans
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