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Dressing of diamond grinding wheels
The grinding performance of diamond grinding wheels largely depends on the surface characteristics of the wheels. The main shaping methods for diamond grinding wheels include rolling shaping, grinding shaping, soft steel grinding shaping, and diamond pen shaping. The commonly used diamond grinding wheel sharpening methods include oil stone sharpening method, corundum block cutting sharpening method, grinding sharpening method, etc.
1. Electric spark trimming method
During the process of electric spark dressing, the grinding wheel rotates at high speed, and the diamond grinding wheel is connected to the positive pole of the pulse power supply. The tool electrode is connected to the negative pole of the pulse power supply, and the grinding emulsion is used as the working fluid. The working fluid is directly injected between the diamond grinding wheel and the tool electrode through the cooling liquid nozzle of the grinding machine. Then, the electrical corrosion phenomenon of pulse spark discharge generated between the diamond grinding wheel and the tool electrode is used to corrode the metal bond, Effectively exposing diamond abrasive particles to achieve the purpose of shaping and sharpening. The electric discharge dressing method can perform in situ and online dressing, which is easy to ensure the grinding accuracy of the grinding wheel; The grinding force of the trimmed grinding wheel is small; It can conveniently achieve fast and high-precision dressing of formed grinding wheels.
2 Cup shaping method
Grinding and dressing diamond grinding wheels with cup shaped silicon carbide grinding wheels removes the metal bond around the diamond abrasive particles through the free grinding effect of the abrasive particles detached from the cup shaped grinding wheel, and the protrusion height of the abrasive particles gradually increases. The cup shaped grinding wheel dressing method has high dressing efficiency and good shaping effect, and the eccentricity of the repaired grinding wheel is basically zero. The repaired grinding wheel has good grinding performance, low grinding force, high grinding efficiency, and can be both reshaped and sharpened during trimming.
3 Soft elastic trimming method
The abrasive belt is rolled onto the abrasive belt wheel, and during dressing, the diamond grinding wheel rotates at a higher speed while the winding wheel slowly rotates, driving the abrasive belt to move slowly. By utilizing the high-speed rotation of the grinding wheel, the elastic deformation of the abrasive belt cannot be fully restored to achieve the purpose of removing the high points of the grinding wheel. The advantage of the soft elastic dressing method is that the appropriate extrusion force can be automatically selected between the diamond grinding wheel and the sand belt being trimmed, and the dressing process can be kept stable; The abrasive belt is fed at low speed, and the abrasive particles in contact with the grinding wheel surface on the abrasive belt are basically not worn, thus obtaining strong dressing ability; Because the abrasive belt is elastic, it can remove the bond between the abrasive particles on the surface of the diamond grinding wheel without damaging the cutting edge of the diamond abrasive particles.
4 Laser trimming method
The laser dressing method uses an optical system to focus the laser beam into a very small spot and act on the surface of the grinding wheel. In a very short time, the metal bonding material on the local surface of the grinding wheel is removed in the form of evaporation and melting sputtering. By controlling the laser processing parameters, the bonding material can be selectively removed without damaging the superhard abrasive particles, causing them to protrude and forming a chip holding space on the surface of the grinding wheel, thus achieving the purpose of dressing. Laser trimming is non-contact processing, with no mechanical force, no consumption of trimming tools, and a small thermal action area. It can obtain a larger chip holding space and a suitable protrusion height of abrasive particles, with high trimming efficiency and easy automation.
5 Electrolytic dressing method
Electrolytic dressing is mainly carried out by electrochemical action and supplemented by mechanical action. The grinding wheel is connected to the DC power anode, and a conductive dressing block is manufactured according to the shape of the grinding wheel to connect to the cathode. The gap between the grinding wheel and the dressing block is adjusted to form the necessary electrolytic gap. The electrolytic grinding wheel grinding fluid is sprayed into the gap through the nozzle, forming a path. The metal bond on the surface of the grinding wheel undergoes anodic dissolution and removal under the action of current and electrolyte.
6 ELID method
ELID (Electronic In process Dres)
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