What are the dressing methods for diamond grinding wheels

In order to make the diamond grinding wheel work more efficiently, after using the diamond grinding wheel for a period of time, we must regularly dress the diamond grinding wheel. Next, we will briefly introduce the dressing method of the diamond grinding wheel.

1. Grinding and dressing method

 1.1 Principle of Grinding Dressing Method During dressing, ordinary abrasive grinding wheel and diamond grinding wheel are used to grind. The diamond grinding wheel does rotating motion, while the ordinary abrasive wheel is rotating while also doing feed motion. The abrasive grains on the surface of the diamond grinding wheel are rubbing. It starts to rotate slowly under the action of force, and at the same time it produces squeezing force on the metal bond, until the bond cracks, with the continuous action of friction, the bond cracks further expand, and finally the bond breaks , So that the blunt diamond particles fall off the surface of the grinding wheel, and the sharp diamond particles are exposed to achieve the purpose of dressing.

 1.2 The characteristics of the grinding and dressing method The main advantages of the grinding and dressing method are: simple structure, convenient operation, short dressing time, stable grinding speed, low grinding cost, but there is impact in the dressing process, the dressing efficiency is low, and the dressing accuracy is low. Poor and more abrasive particles fall off, and the shaping quality is not easy to control. It is mostly used for dressing ceramic and resin bond diamond grinding wheels.

 2. Soft elastic trimming method

 2.1 The principle of soft elastic dressing method The soft elastic dressing method is to set the abrasive belt on the abrasive belt wheel during the dressing. During the dressing, the diamond grinding wheel rotates at high speed, the winding wheel rotates slowly, and the abrasive belt moves slowly on the belt wheel. The contact force of the grinding wheel effectively removes the bonding agent between the abrasive grains on the surface of the diamond grinding wheel, so as to achieve the purpose of dressing.

 2.2 Advantages of the soft elastic dressing method Compared with other dressing methods, the soft elastic dressing method is more suitable for dressing the metal bond diamond powder grinding wheel, because the metal bond diamond powder grinding wheel has both metal plasticity and high hardness, so The dressing is quite difficult, mainly in: the abrasive grains on the surface of the dressing tool are quickly worn out, and the chip space of the dresser is easy to block and the dressing cannot continue. The dressing tool with soft elastic dressing method-the abrasive belt is always in contact with the dressing wheel with new sharp abrasive grains, which can form a good dressing environment, effectively remove the bond between the abrasive grains on the surface of the diamond grinding wheel, and it can be ground during dressing. The cutting force is small and the grinding surface quality is high.

 3. Electric spark trimming method

 3.1 Principle of EDM Dressing In the process of dressing the diamond grinding wheel, the grinding wheel rotates at a high speed, the diamond grinding wheel is connected to the positive electrode of the power source, and the tool electrode is connected to the negative electrode of the power source. The grinding coolant is sprayed between the diamond grinding wheel and the tool electrode, and the voltage is applied to Between the tool electrode and the diamond grinding wheel, spark discharge is generated between the metal bond of the grinding wheel and the dressing electrode. The high temperature of the instantaneous discharge vaporizes the metal bond, the metal bond on the surface of the grinding wheel is effectively removed, and the diamond abrasive grains are effectively removed. Fully exposed to realize the dressing of the grinding wheel.

3.2 The characteristics of electric spark dressing can realize online dressing, which is easy to ensure the grinding accuracy of the grinding wheel. After the dressing, the grinding force of the grinding wheel is small, the shaping accuracy is high, and the shaping and dressing can be completed at the same time, but the shaping speed is slow and the electric spark discharge Dressing diamond grinding wheels will change the performance of abrasive grains due to excessive discharge temperature. Effective control of the temperature of the grinding wheel surface is the key to EDM dressing diamond grinding wheels.

 4. Laser trimming method

 4.1 The principle of laser dressing method Laser dressing method uses an optical system to focus the laser beam into a small spot to act on the surface of the grinding wheel. Except for a small part of the laser light is reflected, most of the laser light is absorbed by the metal binder, and the temperature rises rapidly. , Resulting in the area irradiated by the laser beam, the metal binder is vaporized and removed, and the removal of the bonding agent material usually goes through several processes: irradiation, absorption, heating, and vaporization. When repairing the grinding wheel with laser, reasonably control the laser power and density, which can remove the diamond grit and bond material on the surface of the grinding wheel at the same time, so as to achieve the purpose of shaping the diamond grinding wheel. By adjusting the laser processing parameters, it is also possible to selectively remove the bond on the surface of the grinding wheel. The agent material makes the diamond abrasive grains have the height of protrusions to achieve the purpose of grinding wheel sharpening.

 4.2 Advantages of laser dressing method Laser dressing method is a non-contact dressing method. There is neither mechanical force nor loss of dressing tools during dressing, short laser action time, small action area, and no impact on diamond abrasive grains and binders. Damage, to ensure the grinding performance of the particles, and the dressing efficiency is high, the disadvantage is that the dressing process is more complicated and the cost is higher.

 5. Electrolytic trimming method

 5.1 Principle of electrolytic dressing method The electrolytic dressing method is mainly used for metal bond diamond grinding wheels. During electrolytic dressing, the metal bond grinding wheel is connected with the positive electrode of the DC power supply as the electrolysis anode, and the tool electrode is connected with the negative electrode of the DC power supply as the electrolysis cathode. , Spray the electrolytic grinding fluid between the anode and the cathode as the electrolyte, so that the diamond grinding wheel, electrolyte, tool electrode and power supply form an electrolysis circuit. When trimming, the electrolyte fills the gap between the cathode and the anode. , The current flows from the grinding wheel to the dressing wheel through the electrolyte. The metal component of the metal bond on the surface of the diamond grinding wheel is dissolved in the electrolyte under the action of the electrolyte, and combines with the hydroxide ions in the electrolyte to generate tiny solids. The electrolyte is taken away, which greatly reduces the bonding strength of the surface layer of the diamond grinding wheel. At this time, the mechanical dressing method is used, and the dressing performance can be greatly improved. Therefore, electrolytic dressing is a composite dressing method that is based on electrochemical action and supplemented by mechanical action.

 5.2 Characteristics of electrolytic dressing method The electrolytic dressing method can conveniently realize the online electrolytic dressing of metal bond diamond grinding wheels, and the shaping and dressing can be completed at the same time. It is easy to control the cutting state of the diamond grinding wheel surface. The advantage of electrolytic dressing of diamond grinding wheels is dressing The short time and low grinding heat avoid the reduction in the life of the diamond grinding wheel due to the carbonization of the abrasive particles due to the excessively high dressing temperature. The disadvantage is that the electrolytic dressing method has low shaping accuracy, high dressing cost, and more complicated process.