在线免费播放毛片网站_久久伊人中文字幕色综合_年轻娇小亚洲人日本语夹_色老头国产精品视频_日韩欧美国产成人综合在线观看_欧美一级一区二区视频_午夜精品高清在线_日韩欧美偷拍高跟鞋精品

Grinding is a common method of metal cutting in the machinery manufacturing industry. It is also widely used in the bearing processing industry. The bearing parts that have been heat-treated and quenched may appear mesh-shaped cracks or more regular

After the deep groove ball bearing is installed in the main engine, there is a measurement index called cyclic rotation accuracy. The number of revolutions required for this change to appear approximately repeatedly represents the "quasi-period" of t

When the deep groove ball bearing rotates, the raceway surfaces of the inner ring and the outer ring of the deep groove ball bearing are in rolling contact with the rolling elements, so the running track is a dark surface, and the running track attac

The use factors of tapered roller bearings mainly refer to whether the installation adjustment, use and maintenance, maintenance and repair meet the technical requirements. According to the technical requirements of bearing installation, use, mainten

Grease is indispensable in the work of tapered roller bearings. The maintenance of any bearing is inseparable from grease. Someone asked, is it better to have more grease? The answer is of course no. Matters needing attention when using grease for be

Rolling bearings may be damaged due to various reasons during operation, such as improper assembly, poor lubrication, moisture and foreign body intrusion, corrosion and overloading, etc., which may lead to premature bearing damage. Even if the instal

At present, the internal structure parameters of bearings in my country are almost the same as those of advanced foreign companies. However, the vibration and noise levels of such products in my country are far from those of foreign products. The mai

Generation of vibrations in bearings Generally speaking, rolling bearings do not generate noise by themselves. What is commonly perceived as "bearing noise" is actually an acoustic effect in which the bearing vibrates directly or indirectly with the