In-Depth Manufacturing Processes and Operations Notes
Waste in Shaping Processes
Aim to minimize waste in part shaping.
Material removal processes are generally wasteful, while molding and particulate processing operations have minimal waste.
Key Terminology:
Net Shape Processes: Produce parts with little or no waste and no need for machining.
Near Net Shape Processes: Require minimum machining, thus reducing waste.
Property-Enhancing Processes
Focus on improving mechanical or physical properties of materials without altering their shape.
Examples:
Heat treatment of metals and glasses.
Sintering of powdered metals and ceramics.
Note: Part shape may unintentionally warp during heat treatment.
Surface Processing Operations
Cleaning: Involves removing surface contaminants through chemical and mechanical means.
Surface Treatments: Includes mechanical methods (e.g., sand blasting) and physical processes (e.g., diffusion).
Coating and Thin Film Deposition: Coating external surfaces of parts.
Examples: Electroplating and painting.
Assembly Operations
The process of joining two or more separate parts to create a new product.
Types of Assembly Operations:
Joining Processes: Creates permanent joints using methods like welding, brazing, and adhesive bonding.
Mechanical Assembly: Uses mechanical means (screws, bolts, and nuts; press fits) to connect parts.
Production Machines and Tooling
Manufacturing processes employ machinery and tools alongside skilled personnel.
Types of Production Machines:
Machine Tools: Power-driven machines for cutting operations.
Other Equipment: Includes presses, forge hammers, and plastic injection molding machines.
Production Systems
Comprises people, equipment, and procedures for manufacturing operations.
Critical for efficiency in production processes, categorized as:
Production Facilities: Where production happens.
Manufacturing Support Systems: Ensure effective production management.
Production Facilities
Encompass the factory area, production equipment, and material handling systems.
Layout Principles: Facility layouts are structured into logical groupings called manufacturing systems.
Examples: Automated production lines and machine cells.
Facilities vs Product Quantities
Manufacturing systems are tailored to meet the specific demands of production:
Low Production: 1 to 100 units.
Medium Production: 100 to 10,000 units.
High Production: Over 10,000 units.
Low Production
Usually referred to as Job Shop:
Produces low quantities of specialized products (e.g., prototypes, complex machinery).
Equipment is general-purpose; the workforce is highly skilled for flexibility.
Medium Production
Two production facility types based on variety:
Batch Production: Suitable for medium and hard product variety; setups required between batches.
Cellular Manufacturing: Suitable for soft product variety; cells process parts without setups between styles.
High Production
Mass production strategy focuses on high-demand products.
Divided into two categories:
Quantity Production: Mass production using single or few machines, typically with dedicated tooling.
Flow Line Production: Involves multiple workstations arranged in a sequence for product assembly.
Manufacturing Support System
Companies must effectively organize operations for design and quality control.
Typical departments include:
Manufacturing Engineering: Plans manufacturing processes.
Production Planning and Control: Manages logistics, ordering, and scheduling.
Quality Control: Ensures products meet quality standards.
Manufacturing Economics
Manufacturing seen as a transformation process that adds value.
Two categories:
Production Cycle Time Analysis: Evaluates the time taken for manufacturing processes.
Manufacturing Cost Models: Assesses the costs associated with production.
Recent Developments in Manufacturing
Innovations include:
Microelectronics: Miniaturized electronic devices like integrated circuits.
Computerization of Manufacturing: Enhancing workflow with technology.
Flexible Manufacturing and Microfabrication.
Lean Production and Six Sigma:
Lean focuses on resource efficiency.
Six Sigma emphasizes quality and process improvement.
Globalization and Outsourcing: Adaptation to global market dynamics.
Environmentally Conscious Manufacturing: Practices focused on sustainability.