05100 -- senior design project 05100 - senior design project 05100 – non-destructive joint test...

05100 -- Senior Design Project

05100 - Senior Design Project

05100 – Non-Destructive Joint Test Method & Equipment Development

Sponsor: Delphi Automotive – Harrison Radiator Division

Team Members:

Aleksandra Soldo - IE - Team Leader

Lauren Williams - IE

Joshua Chan - ME

Robert Lefferts - ME

Elizabeth A. Kesel - ME

Jason Mitchell - EE

Thinh Cao - EE


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Team Members

Top(Left to right): Thinh Cao – EE, Jason Mitchell – EE, Joshua Chan – ME

Bottom (Left to right): Lauren Williams – IE, Elizabeth A. Kesel – ME, Aleksandra Soldo – IE (Team Leader), Robert Lefferts – ME


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Scope

Develop a non destructive test method and equipment/tools to verify the long term integrity of

the clinch portion of a heater core pipe to neckshell assembly for an assembly process in a production

environment.

1. Understand/Define the correlation between Joint Integrity and the pressure & temperatures at which they will leak. Develop a test method for production environment.

2. How to accurately measure clinch.


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Long-term Objectives

• Improve overall quality throughout the process by providing useful data and an accurate measurement system• Reduce process variation to be more cost effective and efficient• Help Delphi improve customer relations through improved product quality


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Parameters and DeliverablesClinch Measurement System• Must be non destructive.• Must be applicable to the HC 340 and all heater core assemblies.• The cost of equipment must not exceed $75,000.• Must meet operator safety requirements as well as be

ergonomically acceptable and environmentally friendly.• Must be integrated within the planned assembly/test process.• Equipment must pass MSA.• Must not adversely effect performance of joint or heater core

assembly for use by the customer for the life of the product.• Must be in production by April 2005. • Test must be conducted within cycle time of production assembly

(~20 sec).Clinch vs. Leak Correlation• Statistical proof of correlation between clinch and leak.


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Clinch Information

• Delphi has a 2 mm maximum clinch gap specification.• Each heater core has 2 joints. 3 clinches are used at each

joint.• Clinch gap is currently measured 4 times per shift by hand.• Poor clinches are failed through physical inspection.


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Assembly Process Map

Pipe hold downs extend

Clinch jaws extend

Clinch jaws retract

Test heads advance

Charge heater core

Assemble O-rings to pipes

Load heater core block

Cycle machine


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Leak Test Failure

Material Machine

Man Mother Nature Methods

Out of spec. components•Neck-shell•Pipes•O-ring

Damaged or contaminated components•Neck-shell

– Incorrectly brazed•Pipes

– Physical markings•O-ring

Malfunctioning assembly tools•Clinch tool

– Not clinched far enough– Clinched on the wrong surface– Clinch deforming neck shell

•Hold down tool– Held down on the wrong surface

Operator Error•Misaligned insertion of pipe into neck-shell•Mishandled components

Temperature Changes•Change in temperature causes the density of air to change

Measurement Error•Malfunctioning system•Non calibrated system

Process Variation•Process varies slightly for each model heater core

Potential Root Causes of Leak Test Failure


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ConceptsClinch Measurement• Camera system• Tool measurement• Laser System• X-ray

Correlation Testing• REMAN Facilities• Build our own leak fixture• Use of Delphi resources in

Rochester• Use of Delphi resources in

Lockport


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Feasibility for Measurement Systems1 (Low) 2 3 (Med) 4 5 (High)

Camera X

Laser X

Tool Travel X

X-ray X

Pros:Camera: The system is designed to measure gap at a high accuracy. Camera system is already designed and built. The system is expensive because it is already designed and built.Laser: System can precisely measure gap of clinch. Laser system already designed and built. System is expensive.Tool Travel: System to measure the travel of the clinch tool. The system would be simple to implement. System would be inexpensive to design and build.X-ray: System would give good image of gap clinch.

Cons:Camera: Pipe coming out of heater core might block image of all three clinches. The system needs to be tested with clinched heater cores to determine repeatability of tests.Laser: Possible reflection problem from gap. The laser beam might not reflect properly due to the high reflectivity of the heater core. The system needs to be tested with clinched heater cores to determine repeatability of tests.Tool Travel: The current fixture does not hold the heater core securely in place, causing the heater core to sometimes move in the fixture. This movement causes inaccuracy in the tool travel. The fixture is currently being redesigned by Delphi to eliminate this problem.X-ray: The system would require a large machine and the production time would not comply with the specified production time required to be viable for mass production. Also, the gap of the clinch would not be easily measurable.


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Feasibility for Testing Correlation

Delphi Lockport Delphi Rochester REMAN Facilities Design A Stand

Cost 5 4 5 2

Air Pressure Capability 5 5 1 5

Temperature Capability 5 5 5 5

Leak Measurement Capability 1 5 1 5

Accessibility 1 5 5 5

Setup Ease and Time 5 3 1 1

Test Speed 5 4 2 2

Consistency in oiling o-rings and the effects 5 5 5 5

2-way flow (pressure vs. vacuum) Capability 5 5 1 5

Safety 5 5 3 5

Total 42 46 29 40

scale between 1 - 5

5 being the most feasible and 1 being the least


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Feasibility for Testing Correlation cont.

Pros:Delphi Lockport – Already set-up for the test we would be emulating; no costDelphi Rochester – Easily accessible; equipment only requires slight modification; can measure leak; minor costREMAN Facilities – Highly accessibleDesign a Stand – We could design it to meet all of our needs

Cons:Delphi Lockport – Not easily accessible; Does not measure leakDelphi Rochester – Needs set-up time and minor modificationsREMAN Facilities – Not set-up for our needs (Fluid medium is water instead of air; very crude set-up which needs major modification; not cost & time effective)Design a Stand – Not time and cost effective; out of scope of project


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Concept Selection

Camera

Features of Camera SystemUltra-high-speed processing of 20,000 parts/min.

Digital Image transfer

Repeatability of ±0.05 pixels

On-screen statistical data processing

High-speed rotation search

Trend edge function

Edge area correction

Super-sensitive imaging


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Concept Selection

Delphi Rochester

Test TheoryPurpose: To measure the leak rate of heat core clinches

How it works: We will plug the outlet pipe on each core and flow air through the inlet pipe. Leak will be measured through a flow gauge.

Test Procedure:1. Test parts sequentially at 25 psi, 35 psi, 45 psi, 55 psi at room

temperature (74º F). 2. Test each parts sequentially at 25 psi, 35 psi, 45 psi, 55 psi at 175º F3. Test each parts sequentially at 25 psi, 35 psi, 45 psi, 55 psi at 200º F4. Test each parts sequentially at 25 psi, 35 psi, 45 psi, 55 psi at 225º F5. Test each parts sequentially at 25 psi, 35 psi, 45 psi, 55 psi at 250º F


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Analysis

• Variables• Pressure

• Temperature

• Clinch Gap

• Possible Variables• Oil on O-rings

• Markings on neck shells

• Response• Leak Rate

• Analysis Procedure• Regression analysis

• Determine max conditions for a given leak rate

• Determine test’s confidence


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Summary of Accomplishments

• Understood project definitions and scope

• Developed concepts to meet requirements of the deliverables

• Researching of ideas and concepts discussed

• Feasibility Assessment of all concepts

• Final Concept Development


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Future Plan• Use camera system on trial basis for 2 weeks in order to formulate a more detailed plan for measurement• Implementation of camera system into Delphi production• Complete Leak Fixture modification• Complete Testing• Analyze test results for possible correlation


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Additional Questions?

05100 -- senior design project 05100 - senior design project 05100 – non-destructive joint test...

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