Tools for Analysis - Industrial Engineering - Lecture Slides, Slides of Industrial Engineering

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Charts and Diagrams:

Tools for Analysis

Objectives of Charts and Diagrams

1. permit work processes to be communicated and comprehended more readily
2. use algorithms specifically designed for the particular diagramming technique
3. divide a given work process into its constituent elements for analysis purposes
4. provide a structure in the search for improvements
5. represent a proposed new work process or method

Operation Charts

• Graphical and symbolic representation of the operations used to produce a product
• Two types of operations:
  1. Processing and/or assembly operations
     • Changing the shape, properties
     • Joining two or more parts to form an assembly
  2. Inspection operations
     • Checking the material, work-part, or assembly for quality or quantity

Operation Chart for Subassembly

Step by Step Procedures For Preparing an

Operations Chart

• Identify the parts to be manufactured and purchased
• Determine the operations required to fabricate each part and sequence them
• Determine the sequence or assembly for buyouts and fabricated parts
• Draw the operations chart as explained
• Put time standards, operation numbers and descriptions
• Other relevant information can be added

Process Charts

• Graphical and symbolic representation of the processing activities performed on something or by somebody
• Principal types of process charts:
  1. Flow process chart – analysis of a material or workpiece being processed
  2. Worker process chart – analysis of a worker performing a task
  3. Form process chart – analysis of the processing of paperwork forms

Occurs when an object is intentionally changed in one or more of its characteristics

Operation

Transportation

Occurs when an object is moved from one place to another, except when the movement is part of an operation or an inspection

• Occurs when an object is kept under control such that its withdrawal requires authorization

Combined Symbols

• Two symbols may be combined when two activities are performed concurrently.

Storage

Operation and Inspection

Process Charts

• Process charts summarizes the whole process
• They are used to compare the existing and the proposed methods
• Process is observed, who, what, where, when, and how questions are asked
• Every detail is understood and the chart of the existing situation is drawn

Flow

Process

Chart