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Mounting method of spherical roller bearing grinding wheel

In grinding process, the installation of grinding wheel is a very important work. The proficiency and quality of installation directly affect the production efficiency and machining quality. Because the rotating speed of the grinding wheel is very high and the nature of the grinding wheel is brittle, if the installation is not correct, the grinding wheel will lose balance and cause vibration, affecting the processing quality and precision of the machine tool. In serious cases, the grinding wheel may break and fly out, resulting in serious accidents.

I. Installation method of grinding wheel

There are many ways to install grinding wheels. Due to the different shape and size of grinding wheels, the installation methods are also different. Generally, the commonly used methods of grinding wheels include step flange clamping, plane flange clamping, long shaft clamping and sulfur bonding clamping.

1. Clamp the grinding wheel with the step flange, which is suitable for the flat grinding wheel with large aperture. The grinding wheel is first clamped between the two flanges with nuts or several screws, and then installed on the outer cone of the grinding wheel main shaft, and tightened with nuts.

2. Clamp the grinding wheel directly on the main shaft or connecting shaft with the nut through the plane flange and washer. It is suitable for flat grinding wheel and bowl grinding wheel with not too large diameter.

3. Several clamping methods of the grinding wheel used in inner circle grinding. Usually the grinding wheel is mounted on the grinding wheel main shaft and then the grinding wheel is mounted on the grinding wheel. The grinding wheel is also glued to the joint length pump with a binder and then mounted on the main pump of the grinding wheel. It is suitable for the grinding wheel with a small diameter (less than 20mm). The common binders are copper oxide and phosphoric acid. When bonding, the binder is first made into a paste, then injected into the hole of the grinding wheel, and then the long shaft is inserted into the human, and the copper oxide can be used after natural drying or drying. When inserting the mandrel into the grinding wheel, attention should be paid to keeping it concentric and vertical, so as not to increase the loss and vibration of the grinding wheel dressing and affect the grinding quality.

4. Clamping method of simple grinding wheel on vertical shaft surface grinding machine. Grinding wheel is bonded to flange with sulfur.

Ii. Pay attention to the following items when installing and removing the grinding wheel:

(1) Before installing the grinding wheel, check whether the grinding wheel has cracks. The commonly used method is to lift up the grinding wheel and gently hit the side of the grinding wheel with the wooden handle of the hammer. If it makes a crisp sound, it means that the grinding wheel has no cracks. If the sound is "dumb", it means that the grinding wheel has cracks and must be replaced. It should be noted that, in addition to the ceramic bonded grinding wheel, other bonded grinding wheels, although there is no crack, but the sound made by the enemy attack is relatively turbidity, in addition, the ceramic bonded grinding wheel impregnated with oil or water also has a similar situation, for these grinding wheels, you must ask an experienced master to carefully inspect.

(2) The inner hole of the grinding wheel should be fitted with the long shaft, flange, etc., with appropriate clearance (Table 1) to avoid the grinding wheel bursting due to thermal expansion during grinding. If the aperture of the grinding wheel is too small and the fit is too tight, it is absolutely not allowed to press it in, and the aperture must be expanded before installation, so as to avoid the grinding wheel due to large expansion force in the work. But the matching clearance should not be too large, otherwise the grinding wheel is prone to eccentricity, and the balance is lost, so that the spindle of the grinding wheel vibrates, which not only affects the roughness of the machining surface, but also may cause the grinding wheel to crack. If it is found that the gap is too large, it can be evenly wrapped with a layer of thin paper on the matching surface of the long shaft, flange, etc.

(3) When the flange plate is used to clamp the grinding wheel, the diameter of the two flanges must be equal, and their size should not be less than one third of the outer diameter of the grinding wheel. The inner end face of the flange plate should be dug out by the center part of the inner end face of the flange plate with a depth of 2~3mm ring groove, so that only one ring surface on the outer edge can contact with the grinding wheel, so as to ensure that the clamping is stable, and the end face of the flange plate and the grinding wheel must be straight. If the flange with different diameter or uneven distortion is used, the grinding wheel will be subjected to bending stress, which may cause grinding wheel breakage.

(4) A pad made of thick cardboard, oil-resistant rubber and other elastic materials should be placed between the flange, washer and the end face of the grinding wheel, so that the pressure distribution is uniform when pressing the flange and washer, so as not to damage the grinding wheel. The thickness of the liner can be between 0.5 and 1mm, and its diameter should be slightly larger than the diameter of the flange or washer.


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