Podcast
Questions and Answers
What is the primary purpose of annealing glass?
What is the primary purpose of annealing glass?
- To enhance the mechanical strength of the glass
- To change the color of the glass
- To remove internal stresses caused by uneven cooling (correct)
- To provide decorative features to glass surfaces
Which method is used to create sheet glass through a process of floating?
Which method is used to create sheet glass through a process of floating?
- Floating on water
- Floating on mercury (correct)
- Floating in air
- Floating on resin
What does tempering glass do to the surface of the glass part?
What does tempering glass do to the surface of the glass part?
- It puts the surface into compression (correct)
- It causes the surface to heat up excessively
- It alters the chemical composition of the surface
- It puts the surface into tension
Which of the following statements accurately describes the sequence of tempering?
Which of the following statements accurately describes the sequence of tempering?
What does the term 'gob' refer to in glass fabrication?
What does the term 'gob' refer to in glass fabrication?
What is one of the effects of surface cooling during the tempering process?
What is one of the effects of surface cooling during the tempering process?
What aspect of glass production involves pressing operations?
What aspect of glass production involves pressing operations?
How does tempered glass behave when subjected to surface scratches?
How does tempered glass behave when subjected to surface scratches?
What is the initial step in the injection molding process?
What is the initial step in the injection molding process?
In extrusion, what role does the mechanical screw play?
In extrusion, what role does the mechanical screw play?
How does blow molding operate to create hollow plastic containers?
How does blow molding operate to create hollow plastic containers?
What is a significant advantage of the extrusion process?
What is a significant advantage of the extrusion process?
What is used to expedite the solidification of extruded plastic?
What is used to expedite the solidification of extruded plastic?
Which of the following is NOT a step in the injection molding process?
Which of the following is NOT a step in the injection molding process?
What material type is primarily involved in the blow molding process?
What material type is primarily involved in the blow molding process?
What happens to the thermoplastic material during the injection molding process?
What happens to the thermoplastic material during the injection molding process?
What is the primary purpose of adding processing aids during sintering?
What is the primary purpose of adding processing aids during sintering?
What type of compression applies pressure through a fluid in a rubber envelope?
What type of compression applies pressure through a fluid in a rubber envelope?
In the production of Portland cement, which of the following is NOT one of the primary constituents?
In the production of Portland cement, which of the following is NOT one of the primary constituents?
What is a key characteristic of thermoplastics?
What is a key characteristic of thermoplastics?
What is the main method used for casting thin sheets of flexible ceramic tape?
What is the main method used for casting thin sheets of flexible ceramic tape?
Which method is generally used for forming after hydration begins in cementation?
Which method is generally used for forming after hydration begins in cementation?
Which condition does NOT affect the method used for polymer forming?
Which condition does NOT affect the method used for polymer forming?
Which of the following statements is true regarding hot pressing in ceramics?
Which of the following statements is true regarding hot pressing in ceramics?
What is the primary advantage of using the sand casting method?
What is the primary advantage of using the sand casting method?
In which situation is investment casting most advantageous?
In which situation is investment casting most advantageous?
Which type of casting is characterized by the use of a wax pattern?
Which type of casting is characterized by the use of a wax pattern?
What is a disadvantage of the sand casting method?
What is a disadvantage of the sand casting method?
What is the purpose of using plaster in the investment casting process?
What is the purpose of using plaster in the investment casting process?
Die casting is primarily used for which of the following?
Die casting is primarily used for which of the following?
Which application is powder metallurgy best suited for?
Which application is powder metallurgy best suited for?
What is a key characteristic of continuous casting?
What is a key characteristic of continuous casting?
What is a primary method for shaping metal through deformation using tools such as hammers?
What is a primary method for shaping metal through deformation using tools such as hammers?
Which fabrication method involves melting metal and pouring it into a mold?
Which fabrication method involves melting metal and pouring it into a mold?
What significant temperature difference distinguishes hot working from cold working?
What significant temperature difference distinguishes hot working from cold working?
Which of the following processes involves shaping metal by passing it through rolls?
Which of the following processes involves shaping metal by passing it through rolls?
During which process are alloying elements typically added to the molten metal?
During which process are alloying elements typically added to the molten metal?
What are the characteristics of hot working compared to cold working?
What are the characteristics of hot working compared to cold working?
Which of the following is NOT typically a method of metal fabrication?
Which of the following is NOT typically a method of metal fabrication?
What is a crucial requirement for the die used in the extrusion process?
What is a crucial requirement for the die used in the extrusion process?
What is the purpose of milling and screening in ceramic fabrication?
What is the purpose of milling and screening in ceramic fabrication?
In slip casting, what happens to the slip after it is poured into a mold?
In slip casting, what happens to the slip after it is poured into a mold?
What is one of the key processes involved in sintering for ceramic fabrication?
What is one of the key processes involved in sintering for ceramic fabrication?
Which process is used to form a hollow ceramic component?
Which process is used to form a hollow ceramic component?
At what temperature is aluminum oxide powder typically sintered based on the provided content?
At what temperature is aluminum oxide powder typically sintered based on the provided content?
What is one initial step in the sintering process?
What is one initial step in the sintering process?
Which forming method involves the use of water to create a workable material before shaping?
Which forming method involves the use of water to create a workable material before shaping?
What characterizes the 'green' ceramic stage in fabrication?
What characterizes the 'green' ceramic stage in fabrication?
Flashcards
Forming Operations
Forming Operations
A metal fabrication process where rough material is shaped into a final product.
Hot Working
Hot Working
Metal fabrication process where metal is heated above its recrystallization temperature, making it more pliable for shaping.
Cold Working
Cold Working
Metal fabrication process where metal is worked below its recrystallization temperature, leading to work hardening.
Forging
Forging
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Rolling
Rolling
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Extrusion
Extrusion
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Casting
Casting
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Joining
Joining
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Sand Casting
Sand Casting
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Investment Casting
Investment Casting
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Die Casting
Die Casting
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Continuous Casting
Continuous Casting
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Powder Metallurgy
Powder Metallurgy
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Welding
Welding
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Heat Affected Zone (HAZ)
Heat Affected Zone (HAZ)
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Glass Pressing
Glass Pressing
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Gob
Gob
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Pressing Operation
Pressing Operation
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Glass Blowing
Glass Blowing
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Parison
Parison
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Fiber Drawing
Fiber Drawing
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Annealing
Annealing
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Tempering
Tempering
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Slip Casting
Slip Casting
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Powder Pressing
Powder Pressing
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Dry Pressing
Dry Pressing
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Sintering
Sintering
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Cementation
Cementation
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Hydroplastic Forming
Hydroplastic Forming
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Slip Casting
Slip Casting
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Powder Pressing
Powder Pressing
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Uniaxial Compression
Uniaxial Compression
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Isostatic Compression
Isostatic Compression
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Hot Pressing
Hot Pressing
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Tape Casting
Tape Casting
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Portland Cement
Portland Cement
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Thermoplastic
Thermoplastic
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Injection Molding
Injection Molding
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Blow Molding
Blow Molding
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Thermosetting Plastics
Thermosetting Plastics
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Extruder
Extruder
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Solidification
Solidification
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Study Notes
Fabrication of Materials
- Materials fabrication techniques vary depending on the material type, desired shape, and production volume.
- Metal fabrication includes techniques like forging, rolling, extrusion, drawing, casting, and welding.
- Forming operations reshape raw stock into final shapes using hot or cold working methods. Hot working involves high temperatures for recrystallization and large deformations, while cold working takes place at temperatures below the melting point to achieve work hardening and smaller deformations.
- Techniques like forging (hammering, stamping), rolling, and drawing are used for shaping.
- Casting involves pouring molten metal into a mold to solidify. Common methods include sand casting (large parts), investment casting (complex parts), and die casting, (high volume, low temperature alloys), all useful for large-scale production. Continuous casting creates continuous shapes in the production of slabs.
Casting
- Casting is a common method for shaping metals and certain polymers.
- In casting, molten material is poured into a mold, where it solidifies into the desired shape.
- Sand casting uses a sand mold and is suitable for large parts, like engine blocks.
- Investment casting uses a mold made from a pattern encased in plaster. It is best for complex parts.
- Die casting involves a metal die mold for high-volume, low-melting-point parts.
- Continuous casting is used for producing cast materials with continuous shapes, such as slabs.
Miscellaneous Metal Fabrication Methods
- Welding joins two or more metal pieces by fusion.
- Powder metallurgy involves compacting powdered materials under pressure, for components with low ductility.
Ceramic Fabrication Methods
- Ceramic fabrication involves pressing, blowing, fiber drawing, and slip casting to shape ceramic components.
- Pressing uses a mold to shape a ceramic, such as plates and dishes.
- Blowing is used for forming hollow ceramic shapes, like dishes.
- Fiber drawing produces fibers or filaments of glass or ceramic.
- Slip casting involves pouring a slip (a mixture of ceramic powder and water) into a mold, allowing the water to drain and leaving a solid ceramic component.
- Sintering is a process for improving the properties of ceramic components. This involves producing ceramic and/or glass particles by grinding, placing these particles inside a mold, and pressing at elevated temperatures to reduce pore sizes.
Thermal Processing of Metals
- Annealing involves heating a material to a specific temperature then cooling it slowly to relieve internal stresses or alter the microstructure for improved properties. Types of annealing include stress relief, process (recovery/recrystallization), spheroidize, full, and normalize.
- Spheroidize is used for making soft steels suitable for machining.
- Full annealing produces soft steels good for forming.
- Normalizing a material deforms a large grain, then making smaller grains for better properties.
Processing of Plastics
- Processing techniques for plastics are influenced by factors like whether the material is thermoplastic or thermosetting, the softening temperature (for thermoplastics), the atmospheric stability of the material, and the geometrical dimensions of the final product.
- Thermoplastics can be repeatedly heated and cooled without significant change, allowing for recycling. Examples of thermoplastics include polyethylene, polypropylene, and polystyrene.
- Thermosets undergo permanent changes when heated and cannot be melted and reshaped. Examples of thermosets include urethane and epoxy.
Plastic Molding
- Molding is a common method for shaping plastics. Techniques include compression molding, transfer molding, injection molding, blow molding.
- Compression molding involves placing a plastic compound between mold halves and applying heat and pressure to form the piece.
- Transfer molding is similar to compression molding but uses a separate heated chamber to preform the plastic into a disc.
- Injection molding introduces molten thermoplastic into a mold by forcing it with a moving plunger or ram.
- Blow molding forms hollow plastic products by forcing air into a molten parison inside a mold.
Additional Information
- Sheet forming is a continuous drawing technique for creating glass sheets originally by floating on a mercury pool, producing a continuous sheet of glass.
- Heat treating glass includes annealing to remove stress from uneven cooling and tempering to compress the glass surface to prevent surface cracks.
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