The main grinding wheel size, hardness and dressing grinding wheel.

The finer the size of the grinding wheel, the more abrasive grains per unit area of the grinding wheel, the finer the marks on the grinding surface, and the smaller the surface roughness value.

However, if the particle size is too fine, the grinding wheel is easily blocked, which increases the surface roughness value, generates ripples and causes burns.

The hardness of a grinding wheel refers to the ease with which the abrasive particles fall off the grinding wheel after being subjected to grinding force.

The grinding wheel is so hard that the abrasive particles can not fall off after wear, which makes the surface of the workpiece subject to strong friction and extrusion, increases plastic deformation, increases the surface roughness value, and also easily causes burns.

The grinding wheel is too soft, the abrasive particles will fall off easily, the grinding effect will be weakened, and the surface roughness value will be increased, so we should choose the appropriate grinding wheel hardness.

The dressing quality of grinding wheel is closely related to the tool used and the longitudinal feed of grinding wheel.

The dressing of grinding wheel is to use diamond to remove the passivated abrasive grains from the outer layer of grinding wheel to make the cutting edge of abrasive grains sharp and reduce the surface roughness value of grinding surface.

In addition, the smaller the longitudinal feed of the dressing grinding wheel, the more the cutting edge on the repaired grinding wheel, and the better the contour, so as to obtain a smaller surface roughness value.

Including the material's hardness, plasticity, thermal conductivity.

The hardness, plasticity and thermal conductivity of workpiece material have significant influence on surface roughness.

Aluminum, copper alloy and other soft materials easily plug grinding wheel, more difficult to wear.

The high plasticity and poor thermal conductivity of the heat-resistant alloy easily lead to the early collapse of sand grains, resulting in increased surface roughness.

Including grinding amount, cooling conditions and process system accuracy and vibration resistance.

Grinding amount of grinding wheel speed, workpiece speed, grinding depth and longitudinal feed.

Increasing the speed of grinding wheel may make the propagation speed of plastic deformation of surface metal cannot keep up with the speed of grinding.

The workpiece speed increases, plastic deformation increases, surface roughness increases.

The larger the grinding depth and longitudinal feed, the larger the plastic deformation, thus increasing the surface roughness.

The temperature of grinding wheel is high and the action of heat is dominant, so the action of cutting fluid is very important.

Cutting fluid can reduce the temperature of the grinding area, reduce the burn, wash off the sand and chips, so as not to scratch the workpiece, thereby reducing the surface roughness value.

But suitable cooling methods and cutting fluids must be selected.

In addition, for external grinder, internal grinder and surface grinder, the spindle accuracy of the grinding wheel, precision and stationarity of feed system, stiffness and vibration resistance of the whole machine are closely related to surface roughness.

Sharpening is a process of sharpening a superhard abrasive grinding wheel.

In this process, a sharp cutting edge needs to be formed in addition to the binding agent between abrasive particles and the abrasive wheel abrasive grains which are blunt, so that the abrasive grains with strong grinding performance can stand out the binding agent.

Sharpening must also remove minute materials from the pores on the surface of the grinding wheel to prevent the increase of grinding force on the grinding wheel. The increase of grinding force on the grinding wheel will cause vibration and burn on the surface of the part.

Without proper sharpening, it is impossible for even the best grinding wheel to obtain high quality and dimensional consistency for the machined parts.

In fact, when you invest in high-quality grinding wheels, it's important to trim them well in order to achieve high grinding performance.

Shaping can be said to be a part of the grinding wheel preparatory work, it and the ordinary grinding wheel repair at the same time.

For superhard abrasive grinding wheel, the two processes are carried out separately. Firstly, the grinding wheel is plastic.

In grinding with ultra-hard abrasive grinding wheel, shaping is done with shaping tool or roller. Sharpening is often done with a dressing rod of ceramic bond. After finishing the shaping, sharpening is done to the grinding wheel.

It is important to ensure that the spindle bearing is at a certain temperature (such as the usual grinding state of the grinding wheel) before the grinding wheel includes shaping and sharpening dressing.

This avoids damage to the geometric shape of the part and abnormal wear of the grinding wheel and dressing tool.

Tools for dressing must be handled with care, as they are generally made of hard, wear-resistant but brittle diamond materials, and are very sensitive to tiny cracks and breakage caused by slight impact and stress.

Since the diamond shaper itself is a cutter, it needs to be very sharp.

Using a blunt dressing tool to trim the surface of the grinding wheel will blunt the wheel.

In order to maintain a high quality and sharp diamond dressing tool, it is necessary to rotate the single point or with the cone tip about 1/8 of the enclosure at regular intervals.

Rotation number can be decided according to dressing condition, according to experience, rotate at least every day.

For chisel head and forming the dressing tools, general need 180 ° before they dull rolling again.

Most external grinding machines place parts and grinding wheels on a horizontal line.

The highest point of the outer circle of the part and the highest point of the grinding wheel is called the contact point of the part/grinding wheel.

For grinding wheels for internal grinding machines, it is more important to have the diamond dressing tool close to the highest point of the outer circle of the grinding wheel (i.e. the contact point of the part/grinding wheel at the time of grinding hole).

Use filters to filter coolant accurately to avoid repeated circulation of dirt or chips in coolant.

Contaminated coolant can cause the wheel to wear quickly, increasing the dressing times of the wheel.

Dry dressing of the grinding wheel is done only when dry grinding (in which case cooling of the diamond dressing tool can be interrupted).

Turn off the cooling liquid and let the grinding wheel run for a few minutes.

This prevents the wheel from cracking.