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Questions and Answers
Which of the following is NOT a mechanical cleaning process?
Which of the following is NOT a mechanical cleaning process?
- Ultrasonic cleaning (correct)
- Buffing
- Barrel finishing
- Blast cleaning
What is the primary purpose of metal finishing operations?
What is the primary purpose of metal finishing operations?
- To modify surface properties (correct)
- To increase weight
- To create larger components
- To alter the internal structure
What is vibratory finishing used for?
What is vibratory finishing used for?
Deburring, radiusing, descaling, burnishing, cleaning, brightening, and fine finishing.
Blast cleaning uses a media propelled into the surface using ___ or water.
Blast cleaning uses a media propelled into the surface using ___ or water.
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Match the finishing process with its description:
Match the finishing process with its description:
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Study Notes
Finishing Operations
- Finishing operations can modify the surface of metals for a variety of reasons
- The purpose may be to enhance surface properties, achieve desired aesthetics, or apply decorative elements.
- These operations include surface preparation through cleaning and contaminant removal, as well as applying coatings like paints and platings.
Mechanical Cleaning
- Mechanical cleaning relies on physical methods to remove surface contaminants.
- Common contaminants include:
- Sand from molds and cores used in casting
- Scale from hot-working processes
- Oxides like rust
Types of Mechanical Cleaning
- Blast cleaning
- Uses an abrasive propelled against the surface using air, water, or a wheel.
- Abrasives include steel grit, metal shot, glass shot, plastic beads, and CO2.
- Barrel finishing or tumbling
- Used for finishing large quantities of small parts.
- Parts are loaded into a barrel; additional media, such as metal slugs or abrasives (sand, granite chips, slag, or ceramic pellets), are added.
- Vibratory finishing
- Versatile for deburring, radiusing, descaling, burnishing, cleaning, brightening, and fine finishing.
- Performed in open containers.
- Workpieces and media are loaded into tubs or bowls and vibrated at frequencies ranging from 900 to 3600 cycles per minute.
- Belt sanding
- Uses a rotating abrasive belt that is driven by a motor.
- The belt can be made of paper, cloth, or other materials with varying grit sizes.
- Used for removing material, smoothing surfaces, and creating desired contours.
- Wire brushing
- Uses rotating wire brushes to remove oxides, rust, and other surface contaminants.
- Wires are made from different materials, including steel, brass, and nylon, based on the application.
- Buffing
- Employs rotating wheels covered with cloth or felt.
- Also uses a buffing compound containing abrasives to polish and shine surfaces, creating a smooth finish.
- Electropolishing
- Electrochemical process that uses an electric current to remove metal from the surface.
- Removes burrs, improves smoothness, and enhances corrosion resistance.
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