生产经验证明:设备工作能力准则的建立取决于轴承的失效形式。滑动轴承的失效往往是几种失效形式并存,如磨损、咬焊、点蚀、擦伤等相伴发生,相互影响,很难把他们截然分开,其中磨损和咬焊是主要的失效形式,防止的关键在于能否保证轴颈和轴瓦间形成油膜并保证吸附的油膜不破坏,使其处于完全液体摩擦状态。 当前我国气门行业机械加工工艺尽管各有特点,但明显存有共性,这是公认的,尤其是在机加工占主导的杆部和盘锥面的粗精磨削工艺,几乎皆由无心磨床和外圆磨床承担,他们的主轴向心轴承均采用运转精度较高的扇形块动压轴承结构。扇形块动压轴承,虽然理论上处于液体摩擦状态,但实际上使其形成完全液体摩擦的条件往往不能满足。为此常使设备的精度和效率不能满足需求,更不能适应气门产品的高精度和经济规模的生产需求,常使设备维修频繁,甚至发生严重的抱瓦事故,既耗时费资,又增加管理费用。 Production experience shows that: The establishment of equipment working capacity criteria depends on the failure of the bearing form. Sliding bearing failure is often coexist several forms of failure, such as wear, bite welding, pitting, abrasion, etc. accompanied by the occurrence of mutual influence, it is difficult to completely separate them, including wear and bite is the main form of failure, to prevent The key lies in whether it can ensure that the oil film is formed between the journal and the bearing bush and the oil film is not damaged so that it is in a completely liquid friction state. At present, although the machining technology of valve industry in our country has its own characteristics, there is obviously commonalities. It is generally accepted that rough machining, especially in the machining of the rod and disc cones, is dominated by machining. Cylindrical grinder commitment, their spindle bearings are used to run high precision fan hydrodynamic bearing structure. Fan hydrodynamic bearings, although theoretically in the liquid friction state, but in fact make it completely liquid friction conditions are often not met. To this end, the accuracy and efficiency of equipment often can not meet the demand, but also can not meet the high precision valve products and the needs of economic-scale production, often make frequent maintenance of equipment, and even serious hugging accident, both time-consuming and costly, but also increased Management costs.