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Failure Mode and Effects Analysis. FMEA Fundamentals. Objective. U nderstand FMEA i s a risk assessment tool Present an overview of FMEA Review history of the tool Introduce terms, structure, types of FMEA’s Present a road map for construction

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objective
Objective
  • Understand FMEA is a risk assessment tool
    • Present an overview of FMEA
    • Review history of the tool
    • Introduce terms, structure, types of FMEA’s
    • Present a road map for construction
  • To get a little practice with this tool.
failure modes effects analysis is
Failure Modes Effects Analysis is …
  • A systematic approach used to examine potential failures and prevent their occurrence.
  • The analysis generates a relative risk ranking to each failure mode.
history of fmea
History of FMEA

Developed in the 60’s by NASA to identify single point failures on the Apollo project. SPF = any single piece of equipment that, if it fails, can bring your entire operation to a halt. (managed with redundancy)

US Navy adopted it in the 70’s for weapons programs.

In the 80’s, the automotive industry implemented FMEA and required its suppliers to do the same.

overview
Overview
  • Applied during the early stages of product, process, or design.
  • FMEA begins by defining the functions a part or process is supposed to perform. (Flowchart)
  • Brainstorming is used to identify failure modes
  • This process helps predict problems and provides a method to rankmost likely failure modes.
fmea terms
FMEA Terms
  • Failure Mode Any way in which a process could fail to perform a required function or fail to meet a measurable expectation
    • Effect Consequence of a failure. Ranked by severity.
    • Severity The level of seriousness of the effect of a failure. A “10” represents most severe. A “1” represents least severe.
fmea terms1
FMEA Terms
  • Cause Source of a failure mode; means by which a particular element of the process results in a failure mode. Ranked by probability of occurrence.
    • Occurrence The likelihood that a particular cause will happen and result in that particular failure. A “10” is near certainty. A “1” is a remote chance of occurrence.
slide9

Current Controls All means of detecting the cause or the failure mode before it reaches the customer.

    • Detection Our ability to detect a failure. A “10” implies the current control will not detect a failure. A “1” suggests detection is nearly certain.
fmea terms2
FMEA Terms
  • Risk Priority NumberResults from the multiplication of the three rankings. (SxOxD) Ranges from 1 to 1000. Failure modes with high RPN’s indicate a high risk of failure.
  • Recommended ActionsThose corrective actions identified and implemented to reduce the most serious risks.
fmea process
FMEA Process
  • Inputs
    • Drawing and specifications
    • Other customer requirements
    • Process technical procedures
    • Warranty or nonconformance history
    • History or hysteria
  • Outputs
    • Risk Priority Number (RPN) = severity x occurrence x detection
    • List of actions to prevent causes or to detect failures
    • History of actions taken and future activity
types of fmea s
Types of FMEA’s
  • Design
    • Performed on design criteria focusing on how each requirement can fail. Goal is to maximize design quality, reliability, cost and maintainability
  • Process
    • Performed on each step of a process and how it can fail.
  • Equipment
    • A special PFMEA focusing on equipment failure
fmea can
FMEA can …
  • Objective evaluation of readiness
  • Helps manufacturing in process and test development
  • Documents risks
  • Assess resources, tooling, and maintenance
recommended actions
Recommended Actions
  • Corrective action should focus on those highest concerns as ranked by the RPN.
  • The intent is to reduce the occurrence, severity and/or detection rankings
  • Improving detection control is typically expensive.
  • Emphasis should be placed on preventing, rather than detecting, defects.
fmea is appropriate when
FMEA is appropriate when …
  • New products or processes are being designed
  • Existing designs and processes are being changed
  • Existing designs or processes will be used in new applications or environments
  • Completing a root cause analysis or improvement project, to prevent recurrence of the problem
  • Update an FMEA - as information changes, as high priority failure modes are addressed
fmea fails when
FMEA fails, when …
  • One person is assigned to do the FMEA alone. 
  • The SOD (rating scales) are not customized so that they are meaningful to your company. 
  • The design or process expert is either not included on the FMEA team or is allowed to dominate the FMEA team. 
  • Members of the FMEA team have not been trained and become frustrated with the process. 
  • The FMEA team gets bogged down with the minute details .
  • Rushing through the generation of potential failure modes in a hurry to move on to the next step of the FMEA, possibly overlooking significant but obscure failure modes. 
  • Listing practically the same effect for every failure mode
  • Stopping once the RPNs are calculated  
  • Not reevaluating when new failures occur.
fmea practice
FMEA Practice

Let’s make a cup of coffee

  • Customer wants:
    • French press
    • Medium roast (mild but not overly bitter)
    • 12 ounces … now
  • Watch for:
    • Multiple effects for one failure mode
    • Multiple failure modes with a common effect
    • Multiple causes of a failure mode
practice
Practice
  • Break into groups
  • Handouts
    • SOD rating charts
    • A4 with FORM
  • Discuss
  • Questions?
roadmap
Roadmap
  • Identify the cross-functional team
  • Define customer needs and expectations
  • Review the process or design, list functions
  • Brainstorm potential failure modes
  • Analyze potential failure modes (severity of effect, occurrence of causes, ability to control detection)
  • Calculate RPN’s (risk priority numbers)
  • Identify actions to reduce high RPN’s
  • Execute on actions
  • Recalculate RPN’s and update FMEA
process failure causes
Omitted processing

Processing errors

Errors setting up work pieces

Missing parts

Wrong parts

Processing wrong work piece

Mis-operation

Adjustment error

Equipment not set up properly

Tools or fixtures improperly prepared

Poor control procedures

Improper equipment maintenance

Bad recipe

Fatigue

Lack of safety

Hardware failure

Failure to enforce controls

Environment

Stress connections

Poor FMEA’s

Process Failure Causes
questions to help identify causes
Can any equipment failures contribute to this effect?

Material faults?

Human errors?

Methods and procedures?

Software performance?

Maintenance errors or the absence of maintenance?

Inaccuracies or malfunction of the measurement device?

Environment - chemicals, dust, vibration, temperature, humidity, shock?

Use the 6M’s to help brainstorm and organize potential causes of failures.

Man

Machine

Method

Measurement

Material

Mother Nature (Mileau)

Questions to Help Identify Causes
almost all errors are caused by humans
Source

Forgetfulness

Errors due to misunderstanding

Errors in identification

Errors made by amateurs

Willful errors

Inadvertent errors

Errors due to slowness

Lack of standards

Surprise errors

Intentional errors

Response

Establish a routine

Training for behavior modification

Standardizing procedures

Training engagement and attentiveness

Training skill building,

Basic education, life experience

Discipline

Almost all errors are caused by humans
process control examples
Standardized work instructions or procedures

Fixtures and jigs

Mechanical interfaces

Mechanical counters

Mechanical sensors

Electrical/electronic sensors

Job sheets or process routings

Bar coding with software integration and control

Marking

Training and educational safeguards

Visual checks

Gage studies

Preventive maintenance

Automation (real time control)

Statistical Process Control (SPC)

Post-process inspection or testing

Process Control Examples
typical process documents
Visual aides

Work instructions

Inspection instructions

Inspection records

SPC records

Equipment operating instructions

Training records

Traceability records

Typical Process Documents
in summary
In Summary
  • FMEA is another tool when a team has knowledge of a process
  • It documents “known” failures and fixes
  • It can be an excellent training tool
  • Questions?