What is abrasive grain size

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What is abrasive grain size

:yinglong :2018-03-01 11:13:24

Basic Conditions of Abrasives

Hardness (Hardness of

Abrasive materials)

・Harder than workpiece.

・Fracture (abrasive break apart and creat new cutting

edge) against external force during grinding.

Toughness, shatter

resistance .

・Resistant to deformation and fracture which received

from external force during operation.

・Microfracture

Fire resistance

・Abrasives have a moderate fire resistance which

prevents blunting the edge due to grinding heat.

Inertness

・Chemical inertness (no ability to react with

workpiece).

Hardness and Toughness are conflicting properties. When hardness is high and *self-sharpening is performed well, whereas low toughness grains increase wasteful consumption and it will effect finishing.

* Abrasives are fallen off when these are worn down and lost sharpness, then these expose new cutting edges constantly.

Type of Abrasive materials

There are many kinds of abrasive materials.

The major types of grain and its application are as follows.

Name	Code	Color tone	Applications
Brown Alumina	A	Brown	Hand-free grinding of carbon steels, Precision grinding of carbon steels.
Mono-crystalline fused alumina	HA	Ash gray	Precision grinding of alloy steels, tool steels and hardened steels
Pink Alumina	PA	Pink	Precision grinding of alloy steel, tool steel and hardened steel
White Alumina	WA	White	Precision grinding of alloy steels, tool steels and hardened steels
Zirconia alumina	AZ	Gray	Deseaming, deburring and cutting of steels
Black silicon carbide	C	Black	Grinding, precision grinding of nonferrous metals and nonmetal materials
Green silicon carbide	GC	Green	Grinding of superalloy

About Grit

Size of abrasive particles called "grit", and it's selected based on finishing accuracy of grinding surface.

Grit is specified in JIS R6001, it's denoted by "F + number".

(Example: when grain size is 36, it will be denoted as "F36")

The lower numbers mean large spacing of abrasives.

The expression of Grinding wheel's grade

Abrasives play the most important roles in the raw materials as described above.

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