Transcript Scania STEP-NC machining demo 2008-03-12

Scania STEP-NC machining demo
Showing benefits of using STEP-NC in the automotive industry
2008-03-12
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Scania cylinderhead
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Typical powertrain component
450 000 produced part during year 2007
Machining features
– Planer face
– Hole
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Machining operations
– Planer mill
– Drill
– Ream
2008-03-12
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Simplified part of Scania cylinderhead
2008-03-12
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Activity model for STEP-NC demo
2008-03-12
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Work instructions
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2008-03-12
Creation and maintenance of work instructions is time
consuming, even when having an more automated creation
process.
Information given in these work instructions is geometry
faces with tolerances related to used cutting tool. This
information can also be represented in a STEP-NC model.
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Work instructions as an view of STEP-NC data
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2008-03-12
Eliminating unnecessary information redundancy
Separation of representation and presentation
Fewer work instruction have to be created
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Machining demo video
2008-03-12
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Tool compensator adviser
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2008-03-12
Difficult to cover every possible scenario
The adviser utility is not part of STEP-NC standard, it’s a
functionality utilizing the standard
Possible to implement for many more dimensional
toleranced cases
Discussion on how to compensate deviation
– Deflection, static and dynamic behavior
– Axis motion delay
– Individual cutting tool difference
– Fixture placement error
– Tool wear
– …
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Contributors to this demo
2008-03-12
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Live machining demo
2008-03-12
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What we have done
• Implementation of GD&T representation, not
presentation
• Used recommended practices from CAx
Implementor Forum and www.wikistep.org
• GD&T harmonization between Application
Protocols made our use of AP214e3 specification
possible
• Use of both Geometric and Dimensional
tolerances along with Surface condition
requirement
• Together with STEP Tools Inc., developed
presentation of relationship between tool and
produced face with its tolerances
2008-03-12
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How we have done
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2008-03-12
Reading ARM, mapping tables and AIM sections
Created instantiation structure with Graphical Instance to
represent tolerances for
– Diameter Size Dimension (12 lines in file)
– Linear Distance Dimension (16 lines in file)
– Flatness Tolerance (6 lines in file)
– Surface Texture (11 lines in file)
Reuse of created part 21 blocks that appended in end of
STEP geometry part 21 file
Validated part 21 file with Express Engine
Developed a small Java application to automate append
process. Manual instantiation of STEP models is a good
learning lesson but also very time consuming. Use of
STEP SDK is preferred for effective work
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Express-G model for tolerance representation
2008-03-12
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Java application
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2008-03-12
The purpose was to simplify writing tolerance information
during STEP-NC demo preparation
Not proposed solution
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Proposed GUI – Part Properties
2008-03-12
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Then implemented GUI – Part Properties
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Proposed GUI – Tool view
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Then implemented GUI – Tool Properties
2008-03-12
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Visualization format in STEP-manufacturing
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2008-03-12
ISO TC184 SC4, 54th Plenary meeting, Louisville USA
Presentations of candidate solutions 2008-03-03
– U3D – ECMA TC43
– X3D – ISO/IEC JTC1/SC24
– 3D-XML – Dassault Systemes
– JT Open
– MPEG-4 – ISO/IEC JTC1/SC29
– COLLADA
– Lattice 3D XVL
An visualization solution should include process data in
addition to product data
Improves visual communication of manufacturing data
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Visualization format in STEP-manufacturing
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2008-03-12
Scania cylinderhead AP214 p21 file size: 27660 kB
Scania cylinderhead Adobe 3D file size:
972 kB
(Adobe support U3D and others candidate STEP
visualization solutions)
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Mikael Hedlind
M.Sc., Ph.D Student
KTH, Royal Institute of Technology
Computer System for Design and Manufacturing
Machinist background
Employed at Scania since 1998
During 4 year worked with machining process optimizing and cutting
tool evaluation at Scania.
Magnus Lundgren
B.Sc., Ph.D Student
KTH, Royal Institute of Technology
Computer System for Design and Manufacturing
Machinist background
Has worked as CNC-operator and manufacturing engineer for about
10 years before entering studies at KTH. Graduated for B.Sc. in 2001
and after that working with education at KTH in the area of
manufacturing engineering.
2008-03-12
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