What should be paid attention to when changing the grinding wheel of the centerless grinder.

1. Disassembly of the grinding wheel.

The power supply of the machine is disconnected, and the feed handle is shaken by hand until the grinding wheel frame retreats to the last position, and then the protective cover is opened to tidy up the environment around the grinding wheel.

Loosen the spindle nut two or three times, do not take it off, then pull it out with the flange, squeeze the spindle with a screw to eject the flange, remove the flange, pay attention not to beat, in case the flange is deformed, or the grinding wheel is damaged.

Remove the spindle nut, then remove the grinding wheel, and if the grinding wheel diameter is relatively large, use the lifting tool to lift it.

2. Installation of grinding wheels.

Check whether the inner hole of the flange is clean, polish if there is hair, and remove foreign objects if there are foreign objects.

The grinding wheel should meet the requirements and be qualified, including line speed, adhesive and hardness type.

The grinding wheel should be checked for defects such as cracks and breakage.

There should be a flexible material between the grinding wheel and the chuck to serve as a liner, with a thickness of 1-2mm, and the liner should be in contact with the chuck, and the contact surface should be fully covered.

3. Test operation and dressing of grinding wheels.

Install the grinding wheel, then tighten the nut, the contact surface should be clean, the inner hole of the flange should touch the inner hole of the spindle screw tooth, and the screw should be tightened.

The position of the machine tool handle should be correct, and the vibration of the grinding wheel should be checked to see if it is normal.

Use a corrector when dressing the outer circle and sides of the grinding wheel.

Knock the grinding wheel first, listen to the sound, and tighten diagonally and gradually when tightening the screws.

1. Check the grinding wheel, use a rope to hang the wooden hammer and listen to the sound.

2. Install the grinding wheel, tighten the screws diagonally.

3. Clean the spindle, and it is best to polish it with metallographic sandpaper.

4 screws are put on and tightly idling for 2 minutes!

How to adjust the guide wheel and the grinding wheel of the centerless grinder, hello! Common problems and adjustment methods in the process of using centerless grinders: 1 Workpiece roundness error:

That is, the ovality and cylindricity do not meet the requirements. In the process of workpiece machining, roundness errors can occur due to improper adjustment. It is found that the center of the workpiece should usually be higher than the center line of the two grinding wheels.

When machining small diameter workpieces, the high output is about 1 2 of the diameter of the workpiece, and when the high output is too large, the workpiece will produce periodic radial runout, but it can be improved when using a softer grinding wheel. When grinding long workpieces with small diameters, the center of the workpiece must be lower than the center of the two grinding wheels, and the grinding wheel and guide wheel can compress the workpiece to the supporting plate, eliminating possible jitter. Therefore, adjusting the center height of the workpiece by adjusting the height of the supporting plate is an effective way to improve the roundness error.

2. Workpiece straightness error: There are several kinds of workpiece straightness error in detail, such as the front and rear guide plates of the bracket are not adjusted well, which will make the workpiece produce waist drum shape, size head (workpiece rear taper) defects. Therefore, we can avoid this problem by adjusting the guide plate and the grinding wheel bus so that they are on the same base. There is also the horizontal direction of the guide wheel clamp is not adjusted well and the grinding wheel, the guide wheel itself has taper or surface wear when cutting into the grinding, etc., which will also cause straightness error, we must use a diamond pen to trim the working surface of the grinding wheel, so that it can return to normal sharp cutting performance.

When fine grinding or light grinding, the front part of the grinding wheel is trimmed into a conical shape, and the back part is trimmed into a cylindrical shape, which is conducive to the friction and polishing of the workpiece and improves the accuracy and finish of the workpiece. Hope it helps!

Hello dear, happy to answer for you. 1. First adjust the distance from the blade of the centerless grinder to the grinding wheel, then adjust the guide wheel to the approximate diameter of the workpiece, put the workpiece in the middle of the guide wheel and the grinding wheel, and then slowly enter the guide wheel to clamp the guide wheel slightly to the workpiece, and then push back and forth to find the contact point, the contact point is in the middle position, feel the workpiece to advance to the front and back loose, and the middle is a little tight. 2. The following needs to adjust the guide plate of the centerless grinder, first put the workpiece into it with a workpiece that is slightly longer than the guide plate The effect of adjustment is good, the 1 3 of the workpiece is placed in the middle of the grinding wheel and the guide wheel, at this time can not be squeezed to the workpiece, the workpiece advances and retreats very smoothly, the centerless grinder presses the workpiece of the grinding wheel surface with a wooden rod or other things, so that the surface of the workpiece and the guide wheel is parallel.

In addition, adjust the guide plate of the centerless grinder, adjust the guide plate as flat as the workpiece surface, pay attention to the contact between the front and back of the guide plate and the workpiece, and do not have a gap. Especially in the back, if there is a gap, it will cause swing Bi He Zheng.

In the actual operation of the centerless grinder, the inaccurate feed will occur, and even the guide rail will climb after one year of use, resulting in inaccurate feeding. This is due to the fact that most of the traditional ordinary centerless grinders in China use ordinary screw rods as the transmission of Zheng knife in and out, because the screw rod has a gap, it will lead to direct feed and the actual feed value is not consistent, and at the same time, the guide rail of a lot of centerless grinder has not undergone precise shoveling, resulting in different wear and tear of the guide rail, resulting in inaccurate feeding. The high-precision car Huisong centerless grinding machine will have a much smaller error due to the use of ball screws.

This requires us to go back three times and then three times when entering the knife to eliminate the error caused by the gap, if the feed is still inaccurate, we need to carry out the next step of processing.

Centerless grinding machine, is a kind of grinding machine that does not need to adopt the axial positioning of the workpiece and grinding, mainly composed of grinding sand silver wheel, adjusting wheel and workpiece bracket three machine quietly constructed, wherein the grinding grinding wheel actually serves as the grinding work, the adjusting wheel controls the rotation of the workpiece, and controls the feed speed of the workpiece, as for the workpiece support is to support the workpiece during grinding, these three kinds of parts can have several ways to match, except for stopping grinding, the principle is the same. The reason for the inaccurate feed of the centerless grinder in operation is that most of the traditional ordinary centerless grinders in China use ordinary screw rods as the feed drive. Due to the gap of the screw, the direct feed will definitely not match the actual feed value.

The high-precision centerless grinding machine will have a relatively small error due to the use of ball screws. The common operation method of Tongbi shed is that we go back three times when entering the knife, and then enter three times to eliminate the error caused by the gap, if the knife is still inaccurate, we need to carry out other operations. 1. Check whether the screw brake handwheel is locked.

If it can't be locked, the two pins that hold the screw brake handwheel tap inside may have fallen off, and they should be checked and reinstalled. If the slider is not accurate, check whether the left or right side of the tool holder touches the fallen workpiece, which sometimes occurs.

<>1. Check the surrounding conditions of the machine before starting, and no items shall be placed on the machine, and the workpieces shall be placed neatly. And fill the guide rail with oil once.

2. Before starting the machine, check whether the oil level of the oil tank is normal, whether the water level of the cooling water tank, the gap between the grinding wheel and the guide wheel and the supporting blade is normal, and whether there are working objects or sundries in the machine tool.

3. Check whether the Zhensui switch is reliable before starting, and confirm whether the safety protection such as the protective cover is effective.

4. Turn on the power supply, start the hydraulic switch, and observe whether the pressure of the hydraulic gauge of the machine tool is normal. Whether the cooling fan, grinding wheel, and water pump motor are reversed, and if so, the order of the live wire needs to be adjusted. Then look at each oil mirror and whether there is oil flowing through;

5. Before starting, the grinding wheel and guide wheel dressing seat must be wiped clean, and the oil cup must be filled with oil; It is strictly forbidden to touch the grinding wheel and guide wheel in operation with your hands.

6. Before starting the machine, the operator must be trained according to the work instructions to understand the work operation process.

7. Workers who have not been trained and have no operating experience should not operate the machine to avoid danger.

8. Please choose the grinding wheel abrasive that is suitable for the material requirements of the workpiece. When machining the workpiece, it is necessary to check the size consistency of the workpiece, and the difference cannot be greater than the grinding amount, otherwise it will cause danger.

9. Because the grinding wheel is relatively heavy, many people need to assist when installing or replacing the grinding wheel, and gloves need to be worn for operation to prevent being scratched by the sharp water chestnut of the grinding wheel. The new grinding wheel should be carefully checked for damage and cracks, the damaged grinding wheel can not be used, otherwise it will cause a risk of breaking, and the good grinding wheel should be idled for half an hour after being installed to confirm that there is no problem before it can be used. When installing the grinding wheel lock flange thread, the strength should be moderate and not too tight, do not use the pressure rod, so as not to lock the grinding wheel, and not lock too loose to avoid danger.

After installing the grinding wheel, adjust the stability of the grinding wheel through the stable block on the flange.

10. Check the oil cultivation mirror of the hydraulic system, after the oil gauge is stable, recirculate for more than three minutes before opening the grinding wheel and guide wheel;

11. After the grinding wheel and guide wheel are running normally, turn on the water pump and adjust it to the appropriate water volume;

12. Test grinding 1-3 workpieces, first test the size and appearance of the workpiece, and put the machine adjustment products into the machine box;

13. When shutting down, switch the pump motor to the OFF position to stop the water supply, 14. The grinding wheel and guide wheel will continue to idle for more than 5 minutes to make it dry out of water, so as not to cause the imbalance of the grinding wheel when the machine is turned on again, until the water is dried, and the power supply of the grinding wheel and guide wheel will be switched to the OFF position;

15. After the grinding wheel and guide wheel are stopped, the hydraulic switch can be turned to the OFF position. (Do not stop the hydraulic motor first, so as not to lose oil and wear the bearing and spindle).

16. It is strictly forbidden to take things above the grinding wheel and guide wheel during the operation of the machine, so as to avoid danger caused by falling things.

17. Be sure to choose the spindle oil (10 spindle oil) and guide oil (68) produced by regular manufacturers or recommended by equipment manufacturers, so as to avoid the impact of inferior oil on the equipment.