how to Solution of grinding wheel machine problem

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).

It seems that there is always a temptation to opt for more depth in order to reduce the time it takes to trim.

This is an extremely wrong idea.

The grinding wheel must be dressed at the most suitable depth of removal.

Choosing too large a depth of repair results in high cutting temperatures, a reduction in the life of the dresser, and the removal of a useful grinding wheel layer.

The ultimate result is that both the dresser and the wheel are damaged and counterproductive.

The best amount of dressing is after several repairs, which can not only restore the geometric shape of the grinding wheel, but also produce a good grinding blade.

When using a single point dressing tool, contact the diameter direction of the grinding wheel at an inclination Angle of 10-15o axis line.

This will cause the single point dressing tool to have a sharpening effect while rotating at regular intervals.

The dressing tool with multipoint contact does not need to be tilted at this Angle.

Change the entire end of the dressing tool to contact the surface of the grinding wheel.

The transverse moving speed is the speed at which the dressing tool passes the surface of the grinding wheel during dressing.

It plays a key role in the surface roughness and metal cutting rate required for machining parts.

Moving laterally too slowly will clog the grinding wheel and damage the surface roughness and metal cutting rate.

Too slow lateral moving speed can also cause grinding wheel vibration and burn part surface.

Uniform and faster lateral moving speed can trim the surface of the grinding wheel, improve the grinding performance of the grinding wheel, increase the grinding efficiency and reduce the surface roughness of the parts.

Proper use of coolant can speed up the dressing speed and improve the finishing efficiency.

As a rule of thumb, using a 3/8 inch diameter coolant can remove a lot of heat from the dresser and extend the life of the trimmer.

When the diamond dressing tool passes through the grinding wheel, install a coolant nozzle, cover the entire surface of the grinding wheel or continuously add the coolant to the diamond dressing tool.

When the dressing tool and the grinding wheel contact dressing, never allow the dressing tool, from the coolant out.

Otherwise, the diamond dressing tool will crack or crack under the extreme temperature change of cold and hot.

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.

In grinding wheel dressing, it is of vital importance to effectively reduce vibration and avoid leaving dressing traces, collision and damage dressing tools on the surface of grinding wheel.

This means that the grinding wheel must also be balanced, which is determined by the structural characteristics of the wheel itself.

The imbalance of density and the geometry of the whole wheel will affect the inherent balance of a wheel.

Therefore, it is also important to choose a high-quality grinding wheel.

If be a high quality emery wheel, need proper installation to be able to maintain emery wheel very good balance.

According to the wheel manufacturer's instructions, the grinding wheel is marked with an upward arrow, which indicates the light end position of the grinding wheel after rough balance.

The user can then follow the instructions of the arrow and pay attention to dressing the grinding wheel to achieve dynamic balance.

The coolant is evenly filled and sometimes helps to balance the grinding wheel.

In order to further avoid vibration, it is necessary to ensure that the dressing tool is firmly clamped on the clamp seat and to maintain a minimum amount of drape to ensure that the dressing tool is rigid enough.

If the diamond tool is not firmly clamped, it will cause vibration, noise, ripples on the surface of the part, scratch the surface of the part and damage the dressing tool.

A superhard abrasive wheel must be reshaped and sharpened before starting grinding.

Following the experience described in this article will help your grinding wheel produce the best grinding effect.

The geometrical accuracy, stiffness, thermal deformation, motion stability and vibration resistance of the grinder will directly affect the machining accuracy of the workpiece.

It refers to the motion precision and mutual position precision of each component under the condition of no load.

It is impossible to make a machine tool with absolute accuracy.

This error will be reflected to the workpiece in the workpiece processing, and affect the workpiece machining accuracy.

Generally, there are the radial runout and axial channeling of the main shaft, the straightness of moving parts such as the worktable, and the error of mutual position and transmission of working parts.

The radial runout and axial channeling of the main shaft of grinding wheel and the movement error of the grinding head frame are large, which not only affects the surface roughness of the workpiece after grinding, but also produces roundness and end surface runout of the workpiece, resulting in uneven spark during grinding.

When the working table is moved in the vertical plane, the linearity of the workpiece is affected on the internal and external grinding machine.

The center line of the spindle axis of the grinding wheel of the external grinding machine and the center line of the grinding wheel axis of the internal grinding machine are not equal to that of the workpiece head frame.

The center line of the spindle axis of grinding wheel is not parallel to the moving direction of the worktable, which affects the flatness of the workpiece after grinding.

The transmission error of grinding machine has great influence on the precision of thread grinding and gear grinding.

It refers to the ability of the grinding machine to resist deformation when bearing external force (grinding force).

That is, under the same grinding force, the smaller the component deformation, the greater the stiffness.

On the contrary, the large deformation of the component means that the stiffness of the component is small.

The size of these deformation, which destroys the static original geometric precision of the grinder, will cause the size of machining error of the workpiece.

Therefore, the machine with good rigidity has high machining accuracy.

Grinder, uneven distribution of internal heat source parts in sports how many is different also, the heat generated by the outside heat source to each part of the machine tool is different also, the influence of components on the basis of different materials of different thermal expansion coefficient, deformation of machine tool parts caused by different trace, bring down the original geometry precision machine tool, and affect the machining precision of workpiece.

Therefore, the precision grinding machine is best installed in the constant greenhouse to prevent temperature changes on the machine and workpiece accuracy.

When the moving parts such as grinding wheel frame of grinding machine table are fed in trace cycles or moving continuously at low speed, the phenomenon of non-uniform motion is generally known as creeping.

When this phenomenon occurs in the grinding machine, the feeding is not uniform during the grinding process, which affects the surface roughness of the workpiece.

The grinding machine vibrates during the grinding process, which makes the relative position of grinding wheel and workpiece change periodically, and makes the workpiece surface vibrate, which seriously affects the quality and precision of machining.

In order to improve the precision of the workpiece after grinding, in addition to eliminating the influence of the above factors, it is necessary to pay attention to the reasonable selection of the positioning reference, the clamping method, the selection and correct repair of the grinding wheel, the reasonable selection of the grinding amount and the process method.

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