Features & Types of Difficult-to-grind Materials

Features

1. Strong grinding force

2. High grinding temperature

3. More hardening tendency

4. More abrasives products wear

5. Low grinding efficiency

Types

1. Materials with more brittleness, toughness, and ductility

This type includes ceramics, optical glass, gemstone, and agate, which have higher hardness and brittleness; austenitic stainless steel and some die steel are much higher in toughness and intensity; while nonferrous metals, like copper aluminum alloy, have strong ductility.

2. Materials with high hardness

Large amount of hard spots materials exist in substrates with high hardness. Hard alloy, steel structure hard alloy, high-vanadium steel, and high speed steel belong to this type.

3. Chemically active materials

While grinding this type of material, the surface layer forms an oxide film whose hardness is approximately to abrasives, bringing difficulty for grinding; some abrasive grains' surface encounters chemical reactions that change the chemical composition of abrasive grains and result in chemical wear. Titanium alloy can be a good example.

4. Materials with high intensity under high temperature

Although this type of material has moderate hardness under room temperature, the intensity remains relatively high under high temperature grinding, which is prone to fracture abrasive grains' ductility, the grinding wheels wear seriously and durability becomes much lower. Ni-based or cobalt-based heat-resisting alloy belongs to this type.