Question
Download Solution PDFFor flowering or frosting _____ scraper is used
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Scrapers
- Scrapers are used to correct slight errors on all flat or curved surfaces.
- Scrapers are made up of high-grade tool steel or special alloy steel and tungsten carbide tipped tools.
Frosting
- The frosting is a process in which scraped metal surface is decorated with the use of hand scraper.
- Frosting can also be called as flaking or flowering.
- When a patterned finish is formed on a polished or scraped flat surface
Why frosting is used
- The frosting used as a way of increasing oil retention on scraped or polished surfaces.
- This is important with machine parts in order to keep them lubricated and moving smoothly instead of sticky and jerky movement.
- Without the frosting, the oil would runway, leaving just the two metal surfaces in contact with each other, which is likely to cause seizure of the machine.
Types and uses of scraper:
|
Flat scrapers with rectangular blades |
Used for scraping large flat surfaces |
|
Hook scrapers with rectangular blades |
Used for scraping the centre portion of large flat surface where it is not convenient to use of flat scraper. It is used for frosting. |
|
Half round scraper |
Used for scraping curved surface. |
|
Three square or triangular scraper |
Used for scraping small diameter holes and deburring edges of accurate holes. It has point cutting edge. |
|
Bull nose scraper |
Used for scraping large bearings. It can be used two ways either with circumferential movement or longitudinal movement. |
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