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How To Order
- 1. General Information
1.1 Diamond and CBN Grinding wheels
Diamond and CBN are defined as super hard materials due to their extremely hardness that surpassws the traditional abrasive materials like Aluminum oxide or silicon carbide.
Diamond and CBN Wheels are widely used in high effective grinding processes and offer substantially benefits over traditional wheels.
The main advantage of diamond and CBN wheels:
- Very long tool life and profile stability
- Short grinding times
- Short handling times
- Lack of thermal damage to the workpiece
- Ensure appropriate workpiece quality
1.2 Diamond applications
Diamond is the hardest abrasive material in the world.
Its hardness, wear and thermal resistance made the diamond the most appropriate abrasive to machining such materials as:
- Hard metal
- Hard metal/steel combinations
- Ceramic materials of all kinds
- Carbide-based powder coating
- Polycrystalline diamond and CBN blanks
- Ceramic magnetic materials
- Glass and carbon-fibre reinforced synthetic materials
- Tungsten Carbide
1.3 CBN applications
CBN is the second material after diamond. CBN is produced similarly to the diamond by high pressure and high temperature aynthesis. Due to their chemical features and considerable lower wear, CBN tools are used for grinding such hard-to-process steels as:
- Hardened high-speed steel (HSS)
- High alloyed steels with at least 55 HRC
- Case-hardened steels
- Iron-based powder coatings
- Chill castings
- Soft steels in certain applications
1.4 CDX applications
CDX is a special superabrasive material with the performance between diamond and CBN. It is mainly used to grind the compound of hard&fragile material (like TCT) and Ferrous material (like Chilled steel).
- 2. Diamond and CBN grit size
The chosen grit size affects the performance of the wheel determing the stock remove rate and surface finishing that can be achieved coarser grit size enables higher material removal rate and rougher surface finishing, while a fine grit size is used for attaining a smoother surface finishing.
2.1 Standard Diamond and CBN gradesFEPA
US Standard MeshD/B 25160/70D/B 21370/80D/B 18180/100D/B 151100/120D/B 126120/140D/B 107140/170D/B 91170/200D/B 76200/230D/B 64230/270D/B 54270/325D/B 46325/400D/B 40400/500D/B30500/600D/B 25800D/B 201000D/B 151200D/B 101600
2.2 Diamond and CBN Micron Powder gradesGrain Size(um)ANSI
US Standard Micron504004550035600307002580020100017110015120012.51400111500101600918007.52200630005500046000380002.5100002120001140000.528000
- 3. Superabrasive grit size and Workpiece surface finish
Surface finish is affected by a number of variables, including machine type and condition, type of material, coolant, wheel speed and bond system. As such, this chart should only be used as general guideline.
- 4. Truing and Dressing
Truing and Dressing are necessary for keeping your superabrasive grinding wheel in ultimate working condition.
Truing gives the grinding wheel its geometrical accuracy and makes it run true while dressing opens up the grinding wheel, and exposing the abrasive grit by clearing away bond material from around the cutting edges.
- 5. Order Example
The schedule of wheel ordering is as follows:
- Wheel shape, dimensions of abrasive layer, wheel body dimensions and the bore must be defined in order to avoid misunderstanding;
- Depending on grinding performance type of super abrasive, concentration and grain size must be defined.
- Working conditions (wet or dry grinding), have to be determined.
If ordering the grinding wheel, it is also advisable to charaterise the kind of material to be ground, type of grinder and other criteria that could affect the grinding result.
Example below shows how to order: