Quality monitoring systems

quality control

the monitoring, checking, testing of quality assurance, tolerance, conformity, throughout production, which is specified by client requirments

Quality assurance

system of procedures and policies to ensure products are “right the first time” to elimate faulty products and ensure customer satisfation

Quality control features

• maintaing, checking, and testing

• tolerance

• specific quality control methods 

• laser or probe scanning and measuring 

• digital measuring devices 

• total quality mangament 

• quality standards 

Quality assurance features

• total quality management 

• qyality standards 

Tolerance

• is the level of accuracy acceptable in a particular situation​

• depends on the material used, size and function

• expressed as X + Y (X = exact size required and Y = is the allowable error)​

Laser or probe scanning and measuring to ensure QA

• involves coordinate measuring machinery (CMM)​ - verify tooling accuracy for QA tool change.

• Probe scanners can check measurements of finished components

Laser or probe scanning advantages and disadvantages

Advantages:​

• Highly accurate​

• Non-contact lasers scan thousands of readings for greater accuracy.​

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Disadvantages:​

• Expensive initial cost for setting up

• Need for highly trained personnel ​

• On-going maintenance and calibration requirements ​

Digital Measuring Devices ​to ensure QA

• Digital vernier calipers

• micrometers

• measurements readings with + 0.02 mm accuracy​

Digital Measuring Devices ADV AND DIS ADV

Advantages:​

• flexible’ measuring tools - facilitate dimensional accuracy checks in different situations​

• screw thread used facilitates accuracy of + 0.01mm with some capable of + 0.001mm accuracy​

• come in range of ange of sizes and configurations

Disadvantages:​

• Training is needed

• need to be carefully maintained and handled

Quality assurance 

• ISO 9000 quality

• Rigid machinery, cutter maintence schedules to maintain tolerance

• pre-production cad modelling to check fit and assembly

• MFA (mould flow analysis) predicts materail flow within moulding machinery

• check correct temp for effective cavity filling

• QA procedures reduce the number of QC issues and rejects

• FEA - finite element analysis to analyse the effects of stress

• incorporation of embossed mould identification marks for tracing defaults

Total quality managment

aims to remove waste and make products right first time by continuous improvement.

• workforce’s views, feedback, teamwork and communication are highly prioritised ​