即便是小型加工中心的保養(yǎng)能夠及時到位，在機床長時間使用后其ntn軸承精度也會出現(xiàn)精度超差等現(xiàn)象的發(fā)生。概括起來影響機床主軸變形的因素主要有磨損造成的變形、摩擦熱造成的變形以及機床主軸軸承安裝不規(guī)范造成的變形等三種。
Even if the maintenance of small machining centers can be in place in time, the NTN bearing accuracy of the machine tool after a long time of use will also appear in excess of the phenomenon of precision. Generally speaking, there are three main factors affecting the deformation of machine tool spindle: the deformation caused by wear, the deformation caused by friction heat and the deformation caused by non-standard installation of machine tool spindle bearings.
1、機床安裝不規(guī)范造成的變形（Deformation caused by irregular installation of machine tools.）
新機床的安裝地基和位置對機床加工精度的保持有著重要影響。特別是地基松軟下沉對機床的水平有著破壞性的影響，首先會導致軸承在機床不平衡重力的影響下發(fā)生加工變形，如果這種狀態(tài)持續(xù)一定時間后，會造成軸承主軸扭曲不可逆的變化，最終導致小型加工中心加工精度超差。
The installation of foundation and location of new machine tools has an important influence on the accuracy of machine tools. Especially the soft subsidence of the foundation has a destructive effect on the level of the machine tool. First of all, the bearing will be deformed under the influence of the unbalanced gravity of the machine tool. If this state lasts for a certain period of time, it will cause irreversible change of the spindle distortion of the bearing, and ultimately lead to the machining accuracy of the small machining center is beyond the limit.
2、ntn軸承磨損造成的變形（Deformation caused by wear of NTN bearings）
磨損幾乎是伴隨著機床的整個生命周期，對小型加工中心也不例外，不過這種自然磨損具有一定的穩(wěn)定性。但是如果是潤滑油量過低或者缺失將會導致ntn軸承的急劇磨損，這種非自然的磨損對機床軸承的損壞將是不可逆。只有通過大修的方式恢復軸承的加工精度及直線度才可徹底修復。
Wear is almost accompanied by the whole life cycle of machine tools, small machining centers are no exception, but this natural wear has a certain stability. But if the lubricating oil is too low or missing will lead to the rapid wear of NTN bearings, the abrasive wear of machine tool bearings will be irreversible. only by repairing the bearing's machining accuracy and straightness by overhaul can it be completely repaired.
3、ntn軸承摩擦熱造成的變形（Deformation caused by friction heat of NTN bearing）
機床ntn軸承在工作過程中由于工件的負荷、軸承滾動體與內(nèi)外圈之間的摩擦的原因會引起溫度升高，從而導致軸承因受熱發(fā)生膨脹而產(chǎn)生變形。如在潤滑油量充足、有效的情況下，這種受熱變形都可以得到有效遏制。怕就怕上述第二種情況下的潤滑油缺失造成的干磨，這種狀態(tài)下不僅會產(chǎn)生軸承滾道磨損脫銷，還將產(chǎn)生大量的摩擦熱，造成ntn軸承損壞和提前失效。
The NTN bearing of machine tool will cause the temperature to rise because of the workpiece load and the friction between the bearing roller and the inner and outer rings, which will lead to the deformation of the bearing due to the expansion of heating. If the amount of lubricating oil is sufficient and effective, the thermal deformation can be effectively curbed. Afraid of the second case of the above lubricant loss caused by dry wear, this state will not only produce bearing raceway wear and tear off, but also produce a lot of friction heat, causing NTN bearing damage and early failure.