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MGT601 - SME Management - Lecture Handout 30

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QUALITY CONTROL – I

Breadth of Scope

  • Raw Materials and Piece Parts Inspection.
  • Vender Relation.
  • Process Control.
  • Motivation of Employees.
  • Reliability

What is Quality?

Quality is Conformance to Given Requirement or Specifications on a Product or Service.
The term quality by itself does not necessarily mean high quality. It means uniformity, consistency and conformity to what user wants.

Two Aspects of Quality.

  • Design Quality.
  • Manufactured Quality.

Design Quality

  • Design Quality Covers (materials, form, appearance, functions )
  • When Reference is made to “high cost of quality” such Reference is Almost Associated with Design Quality.

Manufactured Quality

Manufacturing is the transformation of raw materials into finished goods for sale, or intermediate processes involving the production or finishing of semi-manufactures. It is a large branch of industry and of secondary production. Some industries, like semiconductor and steel manufacturers use the term fabrication.

  • After Designing Product has been placed to Manufacture. Defects in Material, Parts, and Subassemblies May Arise.
  • Poor Quality is the Result of Poorly Controlled Manufacturing Process.

What is Quality Control?

In engineering and manufacturing, quality control or quality engineering is a set of measures taken to ensure that defective products or services are not produced, and that the design meets performance requirements.
Quality Control Principles and Methods have been developed and have Proved Effective in Bringing about Cost Reduction & Improved Quality.

  • Quality Control has Many Aspects.
  • Its Techniques are Statistical.
  • Its Motivation is Responsibility of Top Management.

Statistical Quality Control

Process of Application of Statistical Principles and Techniques in Stages of Design, production, maintenance and Service. Statistical Process Control or SPC is a method for achieving quality control in manufacturing processes. SPC relies on measuring variation in manufacturing output and setting control limits based on observations of variations arising solely from common causes. A process that is "in control" is expected to generate output that is within the control limits. If the process produces an "out of control" point, one would not necessarily assume the process had moved to an "out of control" state but would try to locate the special cause(s) for this condition. Only if special causes could not be found would an assumption be made that there might be new common causes to be identified. One aspect of process quality improvement is achieved as these common causes are found and corrected - special causes have no bearing on the overall quality improvement process.

Two Important Aspects of Quality Control

  • Control of Quality.
  • Improvement in Quality.

Control of Quality Can Be Achieved.

  • Control of Manufacturing Information.
  • Control of Purchases & Storage of Raw Materials.
  • Control of Manufacturing Process.
  • Control of Finished Products.
  • Control of Measuring Instruments and Test Equipments.
  • Control of Corrective Action.

If Pakistani Manufacturers are to capture Greater market share, they will have to shift their Emphasis to quality control.

Related Content: MGT601 - VU Lectures, Handouts, PPT Slides, Assignments, Quizzes, Papers & Books of SME Management