# 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
#### 3.1.5 Laser Truing Method  
The laser truing method refers to adjusting the parameters of the focused laser and controlling the position movement of the grinding wheel relative to the laser beam in the three-dimensional mobile platform to make the laser directly irradiate the diamond abrasive grinding tools. Through this non-contact processing method, the ideal geometric accuracy can be obtained, and the grinding edges can be formed. Laser dressing of diamond abrasive tools has attracted the attention and recognition of researchers at home and abroad due to its high processing efficiency, high degree of automation, and reduced pollution [25]. Therefore, the application of laser technology in diamond abrasive grinding tools dressing has become a hot topic in recent years.  
[PERSON] and others [26; 27] found that the average power of fiber lasers and the overlap rate of the light spot was roughly proportional to the dressing efficiency and determined the key laser process parameters to achieve better dressing effects. [PERSON] et al. [28] established a set of high-precision laser inspection and tangential dressing V-shaped concave diamond abrasive grinding wheel systems, took the fiber laser as the detection and dressing equipment, adopted the digital image processing technology, and controlled the average error of the geometric parameters of the V-shaped concave contour to within 3% with the optimization of process parameters.  
With the development of laser technology, [PERSON] et al. [29] employed the blowing assisted dual laser (nanosecond and femtosecond laser) method to dress the diamond abrasive grinding tools, which could reduce the return of plasma particles generated after the removal of bond gasification to the surface of the grinding tool, achieve the height of the abrasive grains protruding from the bond and improve the grinding performance. This method could also avoid the phase explosion effect, form the surface of diamond abrasive grinding tools, quickly reduce the heat around the abrasive grains, and reduce the thermal damage defects of thermal cracks and graphitization on the surface of abrasive grains, to improve the dressing effect and the quality and accuracy of fine-machining. This study also had certain limitations. For example, the dual-laser device was more expensive than the single-beam laser and belonged to a process method of rough dressing diamond abrasive grinding tools.  
As shown in Figure 9[30], compared with blunt diamond abrasive grains, the diamond abrasive grains after laser dressing had sharp grinding edges and ideal shape accuracy, while the dressing efficiency was approximately 70\(\sim\)80%.  
Although laser truing of diamond abrasive grinding tools has the advantages of high precision and high efficiency, the diffusion of plasma after laser dressing, environmental pollution, and the establishment of a heat transfer model in the dressing process are still difficult problems to be considered and solved in subsequent development.  
Figure 9: The micro-topography of the grinding wheel surface before and after laser dressing [30].