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     Conventional Grinding Wheels (Explanation)

(Grinding Wheel)

                                                                                                                                                                                  GRINDING WHEEL
A grinding wheel which is composed of three elements; grain, bond and pore,
rotates at high speed to grind a workpiece efficiently, and create a fine finish
with high dimensional accuracy. This machining method is called “grinding”.
As the work progresses, grain wears, causes cleavage, and breaks down while
generating new cutting edges. this is the self-sharpening of a cutting edge, and
is the biggest feature that other grinding tools do not have.
In general precision grinding, a new cutting edge is generated forcibly when
the grain is worn. This is called “dressing”.

         PA                   60                  K            7                   V                          75R                      1                  255x25x25.40
     Abrasive        Grain Size             Grade               Structrure             Bond Type               Mfrs.Record              Shape              Wheel Size
        RG              8   Coarse            C                    0                   V=Vitrified                Vitrified                Type No.1
          A                                         Soft                Dense          B=Resinoid                     53R
                                                                                       R=Rubber                       75R                                  (thickness)x
         SA                                                                            S=Shellac                      81R                                     (hole)mm
        19A                                                                            OM=Oxychloride                    92
         PA            60                     K                    7                                             Resinoid
         GA                                                                                                            5W
         HA                                                                                                           X99
                                                                                                                                        Type No. 87
          C          4000    Fine                                                                                 Rubber
        GC                                    Z                    15                                                    20
                                                    Hard                Open                                             W

Five Elements Of Grinding Wheel
l	   GRAIN                                                                                    which the structure is made large (more than 10) are called “Porous type
                                                                                              wheels” and are used for avoiding grinding burn in work.
     Has in important function as a cutting edge to cut the workpiece.
     This is most influential to the quality of grinding wheel. Therefore, the right      l   BOND
     wheel for the work material and grinding condition should be selected.                   This works to bond and hold grain. Bond type that is suitable for the use
l    GRAIN SIZE                                                                               and application of the grinding wheel should be selected.
     A unit to indicate size of grain using a number (#). If the value is closer to           Vitrified bond (V):
     “1”, the grain size becomes (coarse). This will affect the surface finish of a           This is a ceramic and glass type bond. High in water and chemical
     workpiece and grinding efficiency. The most suitable grain size for your                 resistance and excellent in form maintaining ability, this is used for
     grinding work should be selected.                                                        general precision grinding, super finishing and honing.
l	   GRADE                                                                                    Resinoid bond (B):
     This represents the degree of bond strength that grips the grain. Generally,             This is phenol resin bond. Because of its high rigidity and resistance to
     it is also called “hardness”. It does not represent the hardness of grain                high- speed rotation, it is used for free grinding. Taking advantage of
     and strength of the grinding wheel. It represents softness and hardness                  large elastic characteristics, this is also used for precision finish grinding.
     of grinding interaction using letters. A character closer to A means the                 Other resin bonds to be noted are epoxy resin bond (Y) which is for
     strength is low (soft), and closer to Z means strength is high (hard). A                 preventing burns in grinding, and polyvinyl acetal resin bond (P) which
     grade should be selected according to the hardness of the work material                  is highly elastic and is used for polishing.
     and desired grinding efficiency.
                                                                                              Rubber bond (R):
                                                                                              This is a rubber (mainly artificial) bond. Fully utilizing its characteristics of
     This implies volume ratio of grain that occupies a certain capacity of                   large elasticity and thermal softening, it is used for regulating wheels of
     grinding wheel. The structure is represented by a number. If the space                   centerless grinders, and cutting wheels. (Diamond CBN Wheel)
     between grains is narrow, it is said the structure is open. Wheels in

    www.kawanlama.com                                                   ABRASIVE PRODUCT                                                                                  33
                         CONVENTIONAL GRINDING WHEELS

                          Grinding Wheels YBS, and YBSL For Double Disc Grinder “EPOXS”                Piercing Hole Type Disc Grinding Wheel (For Double Disc Grinding)
                                                      Features:                                                             These holes and grooves efficiently supply
                                                      Special resin is used as the bond materials                           grinding fluid to enhance the cooling effect, as
                                                      for “EPOXS” grinding wheel, which                                     well as to discharge chips smoothly to suppress
                                                      generated a sharp edge, maintains its                                 grinding burn, its also improves accuracy and
                                                      sharpness and prevent grinding burn.                                  quality. This dressing interval and service life of
                                                                                                                            the wheel are tremendously extended.
                                                     No grinding burn was resulted.                                          Benefits:
                                                                                                                             The pierced hole type disc grinding wheel
                                                                                                                             produced no grinding burn and extended the
                                                                                                                             service life even if the grinding wheel is slightly
                                                                                                                             harder than conventional
                          Grinding Wheel For B20UC For Roll Grinding                                   Super Wide Center less Grinding Wheel
                          (For Cold Roll, Front Stage Work Roll, And Back-up Roll)
                                                Features:                                                                      Features:
                                                The easy control of the grinding wheel surface,                                Center less grinding which enable high
                                                it not only produced good grinding surface                                     efficiency grinding is mostly used. Recently, in-
                                                properties, but also allows performing rough, from                             feed centerless grinding is more used for better

                                                grinding to finish grinding with only one wheel.                               grinding efficiency.
   1                                           Benefits:                                                                      Benefits:
                                               Grinding wheel B20UC for roll grinding shows                                   Noritake’s super wide centerless grinding wheel
                                               excellent performance in rough grinding of cold                                is specially manufactured to be uniform in
                                               rolled, front stage work rolls and high efficiency in                          thickness direction, so that high efficiency at
                                               grinding of back up rolls.                                                     accuracy grinding can be achieved.

                          Sandwich Grinding Wheel For Grinding of Crankshaft With Shoulder             2-layer Grinding Wheel For Angular Grinding

                                              Features:                                                               Features:
                                              This sandwich grinding wheel is composed of three                       The 2-layer grinding wheel for angular grinding is a
                                              layers different in abrasive and grain size                             vitrified grinding wheel for simultaneous grinding of
                                                                                                                      shaft and face, which is called angular grinding and is
                                                                                                                      effective for improvement of grinding efficiency.
                                              This is also effective in improvement of surface
                                              roughness of pins. Compared to be conventional                           Benefits:
                                              single body grinding wheel, considerable                                 The layer for the face is designed to be a porous and
                                              improvement in grinding performance and                                  coarse abrasive with soft hardness grade using sharp
                                              efficiency can be achieved.                                              abrasive material.

                          Small Precision Grinding Wheel

                                                                                                                                      With special bonding materials V36 and
                                                                                                                                      V55 (Aluminium Oxide Grain), and V81
                                                                                                                                      (Silicone Carbide Grain), sharp cutting
                                                                                                                                      edge is generated so that excellent
                                                                                                                                      grinding performance can be maintained
                                                                                                                                      from start to end.

                                                                                                                                      Since dimensional accuracy of the wheel
                                                                                                                                      is enhanced, truing during mounting the
                                                                                                                                      wheel can be small, reducing loss wear
                                                                                                                                      and time due to trying.

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