Advancements in Grinding wheel dressing technology
Release Date：2023-08-15 13:55
Grinding wheels undergo a meticulous process of dressing that encompasses two pivotal steps: shaping and sharpening. In the domain of grinding wheel shaping, a plethora of methods are employed, including turning, rolling, and grinding. Recent years have witnessed the emergence of cutting-edge techniques like electrical and laser shaping. Electrical shaping, tailored to metal-bonded wheels, harnesses electrolysis and electrical discharge machining (EDM) methods. EDM utilizes pulse sparks to create erosion, eradicating metal binders from the wheel's surface. The overlap of successive discharge craters refines the wheel's profile, enabling swift, high-precision shaping, particularly suited for small diameters and ultrathin wheels.
Laser shaping has opened new horizons, utilizing controlled laser emissions to attain desired geometries and accuracies. During the process, resin binders decompose, bronze binders melt, evaporate, or spill off, eliminating the binder material. Diamond abrasives experience minimal damage, ensuring superior quality surfaces post-shaping. Subsequent cycles of laser shaping progressively enhance roundness precision and surface morphology. This non-contact technique, devoid of mechanical forces or tool wear, transcends material limitations, featuring minimal thermal impact and promising potential for automating the shaping process.
Innovative Sharpening Techniques
Grinding wheel sharpening methods encompass diverse techniques tailored to specific needs. These include gas sandblasting, ultrasonic vibration, elastic sharpening, free abrasive extrusion, hydraulic sandblasting, consolidated tool sharpening, and more. Additionally, tools such as sharpening rods, pastes, metal wire brushes, hard alloy blocks, low-carbon steel grinding, and magnetic abrasive sharpening have found their place. Recent times have witnessed the development of electrical sharpening, laser sharpening, and high-pressure water jet sharpening.
Electrical sharpening encompasses techniques like Electrolytic In-process Dressing (ELID), electrical discharge machining (EDM), and hybrid variations. ELID is marked by its efficiency and suitability for online, in-situ sharpening. EDM, comprising spark and contact discharge, reduces grinding forces, extends wheel lifespan, and heightens grinding quality. Laser sharpening, as elaborated earlier, employs laser beams to reshape diamond abrasives, ensuring accuracy without the use of mechanical force.
Advancements in Laser Sharpening
Laser sharpening, an avant-garde technique, directs laser beams perpendicular to the wheel's surface, utilizing generated heat to melt, evaporate, or vaporize binder constituents. This process increases abrasive grain height, and effective grain count, and enhances chip space and grain projection. Notably, laser parameters like pulse frequency and duty cycle, when the energy density is consistent, influence the sharpening effect. Higher frequencies diminish sharpening efficacy, whereas greater duty cycles enhance results. Increased laser power further amplifies abrasive grain protrusion.
High-Pressure Water Jet Sharpening
High-pressure water jet sharpening employs directed high-pressure water columns to impact the wheel's surface. This process leverages water's force to eliminate debris and binder, enhancing abrasive grain projection and chip space. Proper control of pressure and distance ensures optimal sharpening outcomes. This technique boasts simplicity, minimal wear on sharpening tools, and facile control, making it a viable option.
Envisioning the Future
To elevate grinding wheel dressing technology, an expedited exploration of novel principles and application techniques is paramount. The development of universal, efficient dressing systems should be prioritized. In this dynamic landscape, as coated abrasives evolve, the realm of diamond surface modification stands poised to revolutionize precision grinding and polishing across industries. The pursuit of excellence continues as technology charts a path toward enhanced performance and automation.
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