Quality Control on Mechanical-Engineering

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1. Quality Control

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Ir. Sherif Mohamed Abd El-Hamid

2021

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2. ES QUALITY CONTROL
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3. aK QUALITY CONTROL

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The basic concepts

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4. What is quality?

U Degree of excellence, or general excellence.
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Ü Conformance to requirements or specifications. (Crosby 1979)

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Q Fitness for purpose or use. (Juran)

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Q Meeting the requirements of the customer.

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Q Degree to which a set of inherent characteristics fulfills requirements. (ISO
9000-2000) . Mad gill y Äilnall lala Lula dle ¿y ia 5 juaall lic de pane

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Quality Definitions

e excellence

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eee [TAMEETE + quantities of product attributes

WEAR e fitness for intended use

Value-based e quality vs. price

MENE Dd e conformance to specifications

6. À QUALITY CONTROL

V2 Product Quality specifications

7. QUALITY CONTROL

The question: ‘Have we done the job
correctly?’

‘correctly’ being a flexible word depending on the
interpretation given to the specification on that particular day.

To achieve quality we must

Test Inspect Measure

8. QUALITY CONTROL

We should not ask whether the job has been
done correctly, we should ask first:

‘Can we do the job correctly?’

To ensure that the answer is ‘Yes’. However, we should realize
straight away that such an answer will only be obtained using
satisfactory methods, materials, equipment, skills and
instruction, and a satisfactory or capable ‘process’.

9. QUALITY CONTROL

What is Process?

A process is the transformation of a set of inputs, which can
include materials, actions, methods and operations into desired
outputs, in the form of products, information, services or —
generally — results.

System diagram with feedback

10. QUALITY CONTROL

The voice of
the customer

Feedback

Materials

Methods/
Procedures Products
Information
(including
specifications) Process
People

(skills, training,
knowledge)
Environment
Records
Equipment
(tools, plant,
computers)

Services

Information

SUPPLIERS

Documents

CUSTOMERS

Feedback
The voice of

the process - SPC
INPUTS OUTPUTS

11. QUALITY CONTROL

What is Control?

All processes can be monitored and brought ‘under control’ by
gathering and using data. This refers to measurements of the
performance of the process and the feedback required for
corrective action, where necessary.

The next question:

‘Are we doing the job

£ Quality

12. QUALITY CONTROL

What is Quality Control?

A system of technical activities and efforts made by all

employees to achieve standard levels of quality and produce

a commodity that meets the requirements and desires of the

consumer.

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The basic elements of quality control

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© QUALITY ASSURANC
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Qual ity
Control
* Proactive * Reactive
* Prevents Mistakes * Finds Mistakes
* Auditing * Testing
* Whole team * Specific Team

15. & Quality Management
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What is Quality Costs?
Quality costs are the costs associated with
preventing, detecting, and remediating
product issues related to quality.
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16. Quality Management

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Quality Costs

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Costs of Poor Quality

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Internal Failure Costs

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External Failure Costs