Bonds, bodies

AVAILABLE BONDS

RESIN BOND

Resin bonded wheels features high wear resistance, self-sharpening ability, heat conductivity, grain holding properties and great surface finish. Proper choice for sharpening and profiling, surface, centerless, cylindrical and other types of grinding applications.

For resin, we can offer two types of bonds:

  • Phenol bond- mostly used for general purpose, mostly dry grinding.
  • Polyimide bond – mostly used type of bond, for its great wear resistance, high stock removal rates, shape holding and durability.

HYBRID BOND

Hybrid bond is usually used on high-tech CNC tool and cutter grinders for new tool manufacturing or resharpening. Wheels produced using hybrid bond boasts very long lifetime, reasonable heat dispersion, very high stock removal rate and fast feed speed. Hybrid wheels provide clean surface finish without heavily loading the spindle. With very long truing intervals hybrid bonded wheels are best choice for fluting, gashing, clearance and burr processing operations.


VITRIFIED BOND

Vitrified bonded diamond and CBN wheels are extremely hard, providing very high stock removal rate and wear resistance. Vitrified bonded wheels are working very efficiently giving excellent surface quality. They are perfect choice when material is sensitive to heat and high machining accuracy is required. Profile stability and grinding times are also advantages of vitrified bonded wheels. Typically used for bruting, PCD/PCBN insert sharpening, internal grinding (ID grinding), camshaft, crankshaft, cylindrical grinding and other operations.


ELECTROPLATED WHEELS

Electroplated diamond and CBN wheels usually have one layer of diamond or CBN held together by nickel bond also known as galvanic wheels. These wheels do not need to be trued or dressed. It is possible to produce electroplated wheels with very high precision, wheels can easily repeat the profile of application. Basically any type of wheel shape can be covered with diamond or cbn when electroplating. Electroplated wheels are high efficient, have long tool life and are used in various industries such as wood, metal, gemstone, automotive and others.


METAL BOND

Metal bonded diamond and CBN wheels are highly efficient, achieve high stock removal rates, are capable to hold the shape very long. They also require powerful machines. Metal bonded diamond and CBN wheels are mostly used for grinding ceramics, glass, quartz crystal, composite, tungsten carbide, all kind of steels and other materials.


AVAILABLE WHEEL BODIES AND CORES

Our diamond and cbn wheels can be supplied with following bodies (cores):

  • aluminum
  • aluminum powder
  • aluminum and aluminum powder
  • copper
  • copper powder
  • bakelite
  • aluminum and bakelite
  • steel
  • ceramic.

GRIT SIZING AND SURFACE FINISH

It is very important to choose the correct grain size, because it is the main factor influencing the finish of the material surface. Coarser grain will remove more of the material, while smaller grain will provide smoother surface finish.

Same grain sizing is used both for diamond and CBN.

Most common grain sizes are listed below, for other grain sizes please inquire.

Grain sizes according to FEPA US standard mesh
251 60/70
213 70/80
181 80/100
151 100/120
126 120/140
107 140/170
91 170/200
76 200/230
64 230/270
54 270/325
46 325/400
40 400/500
30 500/600
25 800
20 1000
15 1200
10 1600
Grain sizes (um) US standard micron
50 400
45 500
35 600
30 700
25 800
20 1000
17 1100
15 1200
12.5 1400
11 1500
10 1600
9 1800
7,5 2200
6 3000
5 5000
4 6000
3 8000
2.5 10000
2 12000
1 14000
0.5 28000
Grit size (mesh) Ra (um)
 80 0.55-0.75
100 0.40-0.55
120 0.35-0.40
150 0.30-0.35
180 0.25-0.30
220 0.22-0.25
240 0.18-0.22
320 0.17-0.18
400 0.14-0.18
500 0.14-0.15
600 0.12-0.15
800 0.07-0.12
1200 0.05-0.10
1500 0.025-0.05

USING THE COOLANT

We can offer wheels which can work dry, cooled with emulsion, water and cooled with oil.

Because of high friction when grinding heat is generated. It is always recommended to use coolant instead of working dry. This will result in better surface finish, longer diamond or CBN wheel lifetime, faster stock removal.

Correct cooling will save you some time and costs, you will achieve a lot better tool lifetime.

Using pure grinding oil as coolant gives best results, especially when using CBN grinding tools. Very important factor for efficient cooling during the grinding process is the positioning and the parameters of the nozzle and the coolant pressure. Coolant current should hit the grinding wheel at the angle of 20°, as close as possible to the grinding contact zone. Sprayed coolant direction must be the same like wheel spinning direction, so the wheel will transport the coolant into stock removal zone. The opening or the edge of the nozzle must be clean and undamaged. It must be wider than the rim of grinding wheel, but only a little. For example if grinding wheel wideness is 6 mm then the nozzle must be 7 mm wideness. The pressure of the coolant must be chosen according to the peripheral speed of the grinding wheel. Coolant not only cools down the grinding wheel but also washes away the dirt which is obtained during grinding process.

We recommend to use coolant working all the time working with our wheels. When ordering please do not forget to specify if you are working dry, with emulsion, water or oil.

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