In the grinding process, under the action of friction and extrusion, the edges and corners of the grinding wheel gradually become round and blunt, or in the grinding of tough materials, the grinding debris is often embedded in the pore of the grinding wheel surface, so that the surface of the grinding wheel is blocked, and finally the grinding wheel loses its cutting ability. At this time, there will be a slip phenomenon between the grinding wheel and the workpiece, and may cause vibration and noise, so that the grinding efficiency decreases, the surface roughness becomes worse. At the same time, due to the increase of grinding force and grinding heat, it will cause deformation and affect the grinding accuracy, and even cause burns and fine cracks on the grinding surface. In addition, due to the uneven hardness of the grinding wheel and the different working conditions of the grinding wheel, the working surface of the grinding wheel wear is not uniform, the number of abrasive particles in each part is different, resulting in the loss of the shape of the grinding wheel viscosity affects the workpiece surface shape accuracy and surface roughness.
The grinding wheel dressing tool removes the blunt surface of the grinding wheel working surface to restore the cutting performance and correct geometry of the grinding wheel, which is called grinding wheel dressing. When the grinding wheel has been in use for a period of time, the grinding wheel's working surface will gradually become round and blunt under the action of friction and extrusion of the grinding wheel's abrasive particles in the grinding process, or when grinding the toughness material, the grinding debris often inserts in the pore of the grinding wheel surface, so that the surface of the grinding wheel is blocked, so that the grinding wheel loses its cutting ability. At this time, there will be a slip phenomenon between the grinding wheel and the workpiece, and may cause vibration and noise, so that the grinding efficiency decreases, the surface roughness becomes worse. At the same time, due to the increase of grinding force and grinding heat, workpiece deformation will be caused and the grinding accuracy will be affected. In serious cases, the grinding surface will appear burns and small cracks, so it is necessary to dress the working surface of grinding wheel.
How many dressing method?
Grinding wheel dressing generally includes turning, diamond roller, grinding and rolling.
Turning dressing method:
It is the most commonly used dressing method to use single-grain diamond (or single point diamond dresser and diamond dressing block made of finely crushed diamond) as the tool for turning grinding wheel. Diamond tools mounted on tool rest usually incline about 5° to 15° in both vertical and horizontal directions. The contact point between diamond and grinding wheel should be 0.5 ~ 2 mm lower than the axis of grinding wheel, and uniform low speed feed movement of diamond should be made during dressing. The smaller the surface roughness after grinding, the lower the feed speed should be, such as to achieve the surface roughness of Ra0.16 ~ 0.04 micron, dressing feed speed should be less than 50 mm/min. The total dressing amount is generally about 0.1 mm on one side, and the reciprocating dressing is repeated. The cutting depth of rough repair is 0.01 ~ 0.03 mm, and that of fine repair is less than 0.01 mm.
Diamond roller dressing method:
By adopting the method of plating or powder metallurgy of diamond particles embedded in the surface of steel roller made of diamond roller, at a certain speed rotation (so as to reduce the relative speed of roller and wheel), the high-speed rotation of the grinding wheel surface grinding and rolling effect, make the keenness of the grinding wheel and the roller type surface consistent with the work surface. Diamond roller is complex to manufacture, high cost, but durable, dressing efficiency is high, suitable for mass production dressing grinding wheel grinding special shaped surface (such as thread, gear and turbine blade tenon teeth, etc.).
Moresuperhard have CVD diamond rotary dresser, hand setting dresser, reverse Plated Dresser, profile roller dresser, muti-point dresser, single point dresser for for automobile engine, machinery industry, robot parts, flute dresser, turbine blade, automobile valves, crankshafts, sewing industry, turbine blade - fir tree root form, cam Grinding, bearing industry, ball joints, needle injectors.
Dressing with grinding wheel:
In order to achieve the purpose of dressing, the ultra-hard silicon carbide grinding wheel with low speed and high speed is used for grinding.
Rolling dressing method
The hard alloy disc, a set of rollers made of corrugated white iron disc or hardened steel sheet with grooves are used to dress the rolling and extrusion with grinding wheel. The roller is usually installed on the dressing fixture for manual operation.
-----EDITOR: Doris Hu
----POST： Doris Hu