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1、Abrasive
Material |
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Abrasive is the mainest
material in abrasive tools, because it directly grinds workpiece.
There are two kinds of abrasive: Diamond ＆ Cubic Boron Nitride
(CBN).
1. Diamond is the hardest material and can be divided into different
types according to the shapes and intension, and suitable for
processing various hard and brickle material.
2. CBN is another kind of superhard abrasive, its hardness is
only lower than diamond while its thermal stability and chemical
inertia are better, and suitable for grinding and processing
ferrous metal . |
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| Abrasive |
Type |
Mesh
Range |
Main
Application |
Diamond |
RVD
RVDNi |
35/40-325/400
60/70-270/325 |
Make
into resin ＆ vitrified bond abrasive tools , application
for grinding hard alloy ＆ non-metal. |
MBD4
MBD6 MBD8 |
45/50-325/400
45/50-325/400
45/50-120/140 |
Make
into metal , vitrified ＆ electroplated bond abrasive tools
, application for grinding glass , ceramics , gem , stone
and ferrite etc. |
M-SD |
36/54-0/0.5 |
Make
into abrasive paste, abrasive blade , polishing wheel
and whets tone and so on , application for lapping and
polishing various materials |
CBN |
CBN
M-CBN |
60/70-325/400
36/54-0/0.5 |
Make
into resin , metal , electroplated abrasive tools , application
for grinding alloy steel and hard metal materials |
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| only as reference for customers |
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2、Grain
Size |
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Grain size is the
distinguish for the thickness of abrasive, according to the size of
material , we divid the grain size into 33 types:
35/40,40/45,45/50,50/60,60/70,70/80,80/100,100/120,120/140,140/170,170/200
200/230,230/270,270/325,325/400;36-54,22-36,20-30,12-22,10-20,8-12,6-12,
5-10,4-8,3-6,2.5-5, 2-4,1.5-3,0-2, 0.5-1.5,0.5-1,0-0.5,0-1,0-0.5
The choose of grain size will directly affect the grinding efficiency
and thickness degree of workpiece, general speaking, if grain size
is thin, the workpiece will be less rough , and if grain size is thick
, the workpiece can grind more , therefore choosing thick grain size
tools is proper once roughness is enough . |
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| General Choose of Grain Size |
Relationship Between Grain Size
and Roughness |
Grinding
Method |
Mesh
Range |
Coarse Grinding |
40/45-120/140 |
Semi-finished
Grinding |
120/140-200/230 |
Finished
Grinding |
200/230-325/400 |
Lapping,
polishing |
36/54-0/0.5 |
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Mesh
Range |
Resin
Bond Tools |
Metal
Bond Tools |
70/80-100/120 |
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100/120 140/170 |
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140/170 230/270 |
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270/325-20/30 |
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12/22-3/6 |
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| 3/6-2/4 |
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3、Bond |
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Bond can make abrasive tools
grind workpiece efficiently by its function of stickness and holding.
For general bond, there are four main categories: resin bond, vitrified
bond, metal and electroplated bond. |
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Bond |
Code |
Main
Feature and Usage |
Metal |
M |
Sintered with powder
of copper, stanum, silver, cobalt and mill etc, having strong
combination, well wear resistance and long life with bearing
larger burthen. |
Vitrified |
V |
Made from vitrified
material, having well wear resistance, self-sharpness and suiting
high precision grinding and high efficient grinding of common
material and special material. |
Resin |
B |
Usually use phenolic
resin, polyamide resin, having well self-sharpness, heatless,
high grinding efficiency and wide application range. |
Electroplated |
Me |
Abrasive is covered
on substrate by electroplating to make various complex tools.
such as amending tools, grinding plates etc, and having strong
grinding ability and high precision. |
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4、Concentration |
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The concentration is the
scale of abrasive in whole grinding layer. The choose of concentration
should depend on the shape, grain size ＆ bond of tools, also the workpiece
and grinding method, such as:
1. For resin bond, the concentration is 50%-100%, vitrified and metal
is 75%-150%. electroplated is 200%.
2. Coarse grinding use high concentration, and semi-finished grinding
＆ finished grinding use medium one, lapping ＆ polishing use low
one.
3. The abrasive tools with narrow grinding surface use high concentration,
and same to channel grinding.
4. Long life abrasive tools require high concentration . |
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Zhengzhou
Diamond
Superhard Material Co.,Ltd.
Middle of Qinling Road,Zhengzhou, Henan P.R.China
 info@dam-superhard.com
Post Code:450051 Tel:+86-371-67770067 / 67522873 Fax:+86-371-67770119 |
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