What is the reason for the abrasive falling off after using the polishing wheel for a short period of time?
Answer: There are five main reasons for abrasive detachment from bone glue:
(1) Insufficient force is applied when rolling the abrasive on the bone glue. When the pressure is insufficient, the contact area between the abrasive and the bone glue is small, and the abrasive only adheres to the surface of the bone glue, with only the bottom of the abrasive in contact with the bone glue and no bone glue connected around the abrasive. During the polishing process, the abrasive will be 'uprooted' when subjected to force.
(2) The abrasive has not fully solidified after rolling. During polishing, due to the incomplete solidification of the bone glue, the abrasive is equivalent to standing on the soil, and once subjected to force, the abrasive naturally falls off.
(3) The polishing wheel has not been preheated before applying bone glue, or the preheating is insufficient. When bone glue is applied to the rough part of the grinding wheel, due to the lack of preheating or insufficient preheating of the grinding wheel, the bone glue quickly cools down after being applied, which affects the bonding strength of the abrasive.
It is also possible that the bone glue was not rolled with abrasive in a timely manner after application; When the abrasive is to be rolled, the bone glue has naturally cooled. The above situation is particularly common in winter.
(4) The baking temperature after abrasive bonding is too high. When the temperature of baking bone glue is too high, the brittleness of the bone glue increases, and at this time, the abrasive will detach from the bone glue by itself under slight external force.
(5) The consistency of bone glue is not formulated according to the requirements of abrasive particle size. The main reason is that the preparation is too dilute, and at this time, the abrasive is only a shallow layer stuck to the glue, with a very small contact area with the bone glue, which will inevitably affect the bonding strength of the abrasive.