Page 164 - Module DMV20173

EXERCISE 2.3

Identify five principal parameters of a grinding wheel?

Answer: The parameters are (1) abrasive material, (2) grit size, (3) bonding material,
(4) wheel structure, which refers to the relative spacing of grains, and (5) wheel
grade, which refers to the bond strength of the wheel in retaining abrasive grains.

EXERCISE 2.4

List four abrasive materials used in grinding wheels?

Answer: The principal abrasive grit materials include:

(1) aluminum oxide;
(2) silicon carbide;
(3) cubic boron nitride;
(4) diamond.

EXERCISE 2.5

Identify three basic categories of material removal processes.

Three basic categories of material removal processes are:
(1) conventional machining;
(2) abrasive processes;
(3) nontraditional processes.

EXERCISE 3.1

Describe the process of sand casting.
1. Preparation of sand mould.
2. Melting of metal at elevated temperature.

3. Molten metal poured into a mould.
4. Solidification and Cooling in a mould.
5. Removal of mould to obtain casting product.
6. Cleaning and finishing.