# Research and Progress on Truing and Sharpening Process of Diamond Abrasive Grinding Tools
## 3 Dressing Method of Diamond Abrasive Grinding Tools
### Truing Technology of Diamond Abrasive Grinding Tools
#### 3.1.2 Rolling Method  
With a view to addressing the problems of the serious wear and tear of tools in the diamond pen truing method, the rolling method came into being. The diamond pen truing method achieves the purpose of dressing according to the action of shearing force, and the rolling method mainly breaks and lets fall the abrasive grains through the action of pressure. Figure 4 shows a schematic diagram of the rolling method, in which a green silicon carbide (SiC) or white corundum grinding wheel is generally selected as the dressing grinding wheel, and the bottom is a diamond abrasive grinding wheel. The diamond abrasive grinding wheel is fixed and rotated clockwise. The dressing grinding wheel rotates and reciprocates back and forth through the grinding machine for grinding. After grinding by the rolling method, the diamond abrasive grains are sharper. It can be seen from the dressing principle that the rolling method has high requirements on the rigidity of the grinding machine.  
Figure 4: Schematic diagram of the rolling method.  
Figure 3: Variation law of grinding surface roughness Ra with the dressing times [6].  
[PERSON] et al. [9] studied the lateral dressing of diamond abrasive grinding wheels, which employed an Al\({}_{2}\)O\({}_{3}\) or SiC dressing wheel to break and drop off the diamond abrasive grains and shortened the dressing time under the condition of constraining the dressing force through the basic relationship between geometry, kinematics, and the removal mechanism. [PERSON] et al. [10] studied the tangential grinding of V-shaped tips of resin-bonded and metal-bonded diamond abrasive grinding wheels with SiC dressing grinding wheels and found that both kinds of diamond abrasive grinding wheels after dressing could meet the requirements of microstructure processing. Figure 5 shows the topography of the diamond abrasive grinding wheel surface after dressing by the rolling method [11]. It was found that the diamond abrasive grains protruded from the bond material and had appropriate shape accuracy, and the dressing efficiency was approximately 45\(\sim\)55%.  
Some researchers have integrated the ultrasonic vibration dressing method into the rolling method to achieve higher quality grinding. [PERSON] et al. [12] designed a dressing device for truing and sharpening the grinding surface of the diamond abrasive grinding wheel by using an ultrasonic vibration device. [PERSON] et al. [13] developed a method of using \"mid-frequency vibration-assisted grinding with self-induced grinding forces\" to produce micro-groove arrays on single crystal diamond (MCD) for super-hard material removal; the experimental results showed that there were no obvious burrs and cracks on the single crystal diamond, which could ensure high-quality grinding.  
Although the rolling method has the above dressing characteristics, the residual bond materials easily block the surface of the grinding wheel and reduce its grinding ability, which is the key to restricting the development of the rolling method.