Centreless Grinding:
Centreless Grinding: Centreless Grinding is little different operation in cutting process, it uses some of the same abrasive cutting particles(sand, diamond, aluminum oxide etc..) on the grinding wheel to cut/remove a small portion from workpiece to obtain good surface finish, perfect dimensional tolerance etc. The workpiece in centreless grinding is placed in between rotating and support wheels, which is different from many other handling systems. According to the type of operation, the work piece is supported. Centreless grinding operation plays a crucial role in large productions.
Types of centreless grinding operations:
There are two types of Centerless grinding operations they are as follows:
- Internal Centreless grinding.
- External centreless grinding.
Internal Centreless Grinding:
Internal Centreless Grinding process is used to grind the inner portion of the objects/product like holes, tubes etc.. by this internal grinding process, we can obtain an excellent internal roundness with accurate dimensional tolerances.
This type of method consist Grinding wheel, support wheel, regulating wheel etc.. the operation is done by placing the grinding wheel inside the work piece and rotated with the help of regulating wheel and supporting the work piece with the help of support wheel.
External Centreless Grinding:
External grinding is done to obtain a high surface finish and clear roundness. On this grinding process, we can perform operations like Spherical type, Tapered, formed components and Straight cylindrical products on it.
To perform the operation like formed components grinding wheel should have more width than the object. and the work like cylindrical can be done by grinding wheel and support by regulating wheel.
Advantages of centreless grinding:
- Centreless grinding operation requires less grinding stock.
- Centreless grinding has a high rate of production.
- This process helps in high rigid support to work.
- This operation is easy to control.
- This operation is done with quality output.
- This type of work can be done by less skilled persons.
- This centreless grinding process occurs an exact floating condition.
Disadvantages of centreless grinding:
- This operation is not so easy to handle at different working diameters.
- This type of operations is not useful at less production.
- Changing the tool of grinding wheels takes a long time.
- This cannot be highly useful to long Flat and key ways.
