Technical Data／Diamond / CBN Grinding Wheel
Specifications of Diamond / CBN Grinding Wheels
③Bond Strength
Degree of bonding is an index that shows the degree (strength and hardness) with which bonding material (bond) holds abrasive grains, and is a ranking based on N. Generally, the harder (raising) the degree of bonding, the longer the lifetime but the lower the sharpness; the softer (lowering) the degree of bonding, the shorter the lifetime but the higher the sharpness.
SDC 200 3.0 Diamond / CBN grinding wheels (super abrasive wheels) can be applied to various specifications by combining "abrasive grain (abrasive grain type)", "grit size (abrasive grain size)", "bond strength", "degree of concentration (grain concentration in bond)", and "bond type (bonding material)". We will select the most suitable specifications for the type and shape of the work material, the required finished specifications, and the equipment installed to. N 100 ■Example of Grinding Wheel Size Label
There is no rigid provision for the classification and the ranking is shown only within the same manufacturer, meaning the hardness of Company A and Company B is not the same even if the sign is the same "N." For this reason, degree of bonding may not be displayed. * Example of abbreviation: SDC 200-100BS 40
Soft
Hard
BS40 ⑤Bond Name
J LN
P R
①Abrasive Type
②Grit Size
③Bonding Degree
④Concentration
⑥Thickness of Abrasive Layer
①Abrasive Grains
Degree of concentration shows the content ratio of Diamond / CBN abrasive grains (abrasive grain ratio) in the abrasive layer. When the same grit size is considered, the higher the degree of concentration, the number of abrasive grains, while the lower the degree, the lower the number of abrasive grains. It is important to select the degree of concentration most suitable for the work material. ④Degree of Concentration
Abrasive grains of the Diamond wheel are of two types: Natural Diamond (D) and Synthetic Diamond, which is often used in industrial applications. "Synthetic Diamond (SD)" and "Metal Coated Composite Diamond (SDC)" are used for the grinding wheel. Also, "Cubic Boron Nitride (CBN)" with hardness following Diamond and "Metal Coated Cubic Boron Nitride (CBNC)" are abrasive grains also used for the grinding wheel.
Concentration Content of Abrasive Grains （ct/cm 3 ） 200 8.8 175 7.7 150 6.6 125 5.5 100 4.4 75 3.3 50 2.2 25 1.1
Abrasive Type
Symbol
Features
Natural Diamond
D ・The shape of abrasive grains is irregular and the crushing strength is low. ・This is rarely used at present.
*1 ct=200 mg
・Used for gridding non-ferrous materials. ・The shape of abrasive grains is irregular and the crushing strength is low.
Synthetic Diamond (Friable Type) * Used Mainly for Resin Bond.
Diamond Abrasive Grain
⑤Type of Bond
SD
Synthetic Diamond (Blocky Type) * Mainly Used for Metal / Vitrified Bond and Electroplated Wheels.
・Used for gridding non-ferrous materials. ・The shape of abrasive grains is blocky and the crushing strength is high.
Bonding layer to hold and combine abrasive grains in the super abrasive wheel is generally called bond. Abrasive grains drop off during processing and the other grains show up instead, that have the wheel grinding sharp. A bond most suitable for the work material and applications must be selected.
Metal-Coated Synthetic Diamond
SDC ・Above synthetic abrasive grains coated by metal such as nickel, copper and titanium for the purpose of improving the abrasive grain holding power.
Abrasive Grain Used
Types of Binding Materials (Bond)
Meaning of Symbol
Main Materials of Bond
Symbol
Main Workpieces / Applications
・Used for grinding ferrous materials. ・The shape of abrasive grains is blocky and the crushing strength is high.
Diamond Cutting tool materials (cemented carbide, cermet, ceramics), metallic molds (cemented carbide) CBN Metallic molds (ferrous hardened steel, high-speed steel, die steel), surface grinding of ferrous sintered parts Diamond Hard brittle materials (glass, ceramics, crystal, sapphire) CBN ID honing of ferrous automotive parts, cutting of ferrous bar materials
Cubic Boron Nitride (Single Crystal)
Resin
B
Bakelite
Resin
CBN （BN）
CBN Abrasive Grain
・Used for grinding ferrous materials. ・The shape of abrasive grains is irregular and the crushing strength is low.
Cubic Boron Nitride (Polycrystal)
Metal
M
Metal
Metal
Diamond Cutting tool materials (sintered diamond tip, CBN tip) CBN Ferrous automotive parts, heat-resistant materials (Inconel)
CBNC （BN）
・Above synthetic abrasive grains coated by metal such as nickel and copper for the purpose of improving the abrasive grain holding power.
Metal-Coated Cubic Boron Nitride
Vitrified
V
Vitrified
Ceramics
Diamond Rubber, FRP, magnetic materials CBN Form grinding of ferrous automotive parts, heat-resistant materials (Inconel)
Electroplated
P（E） Electro-plated
Ni plating
②Grit Size
Indicated Grit Size (Mesh)
JIS Grit Size (Mesh)
Average Grain Size （µm）
Europe FEPA USA
Guide for Applicable Zone
The grit size is the size of Diamond / CBN abrasive grains (grain diameter). The grit size and its classification method are specified by JIS (JIS B 4130). It should be noted, however, that abrasive grains used in the super abrasive wheel are standardized up to # 325 (325/400) only. For grains finer than # 400, the displayed grit size is not common to all manufacturers because each establishes the standard independently (or freely) and operates. For example, Company A's grit size # 10000 may not be the same as Company B’s grit size # 10000; therefore, it is necessary to check the size of abrasive grains to select the correct size.
⑥Material Processed by Diamond or CBN Wheel
16 20 30 40 50 60 80
16/20 20/30 30/40 40/50 50/60 60/80
- - - -
- - - -
1,190
■Diamond
840 590 420 300 250
Wear Resistant Metal Heat Resistant Metal
Magnetic Material
Crystalline Material
Stone, Ceramic Products
Cutting Tool
Electric Parts
Plastic
Other
301 252
50/60 60/85
● Cemented Carbide ● Cermet ● Ceramics ● PCD,PCBN
● Ceramic (Aluminum Nitride, etc.) ● Silicon ● Compound
● Ferrite
● Glass ● Crystal ● Quartz ● Sapphire ● LT, LN
● Stone ● Refractory Material ● Tile ● Asphalt ● Concrete
● Titanium
● F.R.P. （C.F.R.P） （G.F.R.P） ● Urethane
● Graphite ● Conventional Wheel (Grindstone) ● Jewelry ● Rubber ● Composite Material (MMC, etc.)
Base Alloy
80/100 181 85/100 177 100 100/120 151 100/120 149 120 120/140 126 120/140 125 140 140/170 107 140/170 105 170 170/200 91 170/200 88 200 200/230 76 200/230 74 230 230/270 64 230/270 63 270 270/325 54 270/325 50 325 325/400 46 325/400 44 400 - - - 37 600 - - - 30 800 - - - 20 1,000 - - - 15 1,500 - - - 10 2,000 - - - 8 2,500 - - - 6 3,000 - - - 5 *The average grain size of micron size is a reference value and does not represent our standards
(Alumina, etc.)
Semiconductor (SiC, GaN, etc.）
■CBN
Wear Resistant Metal
Structural Component
Corrosion Resistant Metal
Heat Resistant Metal
Magnetic Material
Medical Materials
Cutting Tool
Other
● SKH ● SKS ● SK
● SKD
● SCM ● SNCM ● SCr ● SUJ
● SUS
● SUH
● Dust Core ● Alnico
● Cobalt-
● Copper Alloy
Chromium Alloy
■Diamond or CBN Wear Resistant Metal Heat Resistant Metal Magnetic Materilal
Other
● Sprayed Metal ● Cobalt Base Alloy ● Tungsten
● Nickel Base Alloy
● Rere Earth Magnet
● Cast Iron ● Sintered Alloy ● Aluminum Alloy
061
062
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