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This means that temperature increases with increasing wheel depths of cut (d ), wheel diameter (D) and wheel speed (V ) and decreases with increasing work speeds (v) The wheel depth of cut has the greatest influence on temperature The aforementioned expression does not take account of the effect of specific energy, thermal workpiece properties and type of abrasive used A more comprehensive expression for estimating the mean surface temperature in grinding was given by Chandrasekar et al [23] and Shaw [24] as follows: qd ~



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This chapter provided a brief pictorial view of some of the simpler mechanisms you can use to shape and control motion. We looked at mechanisms

Ru ( vd ) Vl ( k C )

(30)

Fig. 14-24.

where R is the fraction of the total energy dissipated in grinding going to the workpiece (see Table 31), u is the specific grinding energy, v is the table or work speed, d is the wheel depth of cut (downfeed), V is the wheel speed, l is the wheel-work contact length, K is the thermal conductivity of the workpiece, and rC is the volume specific heat of workpiece





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from the simple lever to a geared link system providing complex harmonic motion. A large number of the mechanisms acted to change the direction of motion, either from a linear motion to a di erent linear motion, or from rotary motion to a linear motion. The ability to transform rotary motion from a motor into linear motion is used by many machines. Another set of mechanisms focused on parallel motion moving a link in space without rotating it. Parallel motion is useful for providing a precise grip for robotic hands, among other uses. Finally, the above mechanisms shape motion. The shape of a motion is the path it follows through space over time. If you are interested in mechanical motion, I highly recommend that you check out the cardboard kits and creations of Flying Pig, at www. yingpig.com. As you go through your day, look at the machines around you and see what mechanisms they use to shape their motions.

Approximation of the fraction of heat (4) going to the workpiece [21]

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Material Steel Steel Ceramics or glass Steel Steel Ceramics or glass Steel Types of wheel Al2O3 or SiC CBN Diamond Al2O3 or SiC CBN Diamond Al2O3 or SiC Approximate value of R 08 05 04 05 03 02 005

1. 2. 3. 4. You have a stick. You drill a hole in it. What can you do with this You have TWO sticks and a wheel. What can you do with those What does a four-bar linkage do You want a wheel to go in one direction but not another. How do you limit it to one-way rotation

The aforementioned expressions show that process parameters, type of abrasives and workpiece properties as well as grinding methods influence the amount of heat going to the workpiece during grinding A grinding fluid plays an important role in removing heat generated during the grinding operation Apart from evacuation of the heat generated, the grinding fluid also functions as a lubricant to reduce friction, and carries the swarf away from the grinding interface [5][22][25]

The wear of a grinding wheel somehow cannot be avoided when grinding materials, and the rate of this wear plays an important role in determining the efficiency of the grinding process and the quality of the workpiece as is the case with cutting tools According to Jackson [26] and Malkin [12], wear mechanisms in grinding wheels appear to be similar to that of single-point cutting tools, the only difference being the size of the swarf particles generated They observed that the wear behaviour is similar to that found in other wear processes (Figure 328); high initial wear followed by steady-state wear A third accelerating wear regime usually indicates catastrophic wear of the grinding wheel, which means that the wheel will need to be dressed This type of wear is usually accompanied by thermal damage to the surface of the ground workpiece Grinding wheel wear is most often expressed in terms of the G-ratio which is the workpiece volume removed (Vw) divided by the unit volume of the wheel wear (Vs )

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