The results indicated that the dimension, shape and purity of base material could meet the functional demand of solid lubricant ; the thermal decomposition temperature of ptfe resin exceeds 400 c, but organic and inorganic packing filler added in ptfe made the water absorption rate of composite material increased, melting temperature and decomposition temperature decreased, in the meanwhile oxidative decomposition reaction was accompanied ; polar groups such as c = o, c - o - c and so on in the carbon fiber surface is advantageous to increase compatibility with other components and interlayer shearing strength ; uniform design experimental method could help to find the relationship between formula and frictional property by relatively small tests. the developing trend of each formula ' s friction coefficient could be showed by fitting curve ; the friction coefficient with no copper powder or graphite in formula was relatively big. this fact showed that copper powder and graphite should be used cooperatively ; it was found that when the ratio of copper powder to graphite by weight is 15 : 60, 30 : 30 - 40 and 60 : 15 - 30 respectively, the friction coefficient was relatively small. the degree of crystallinity of pure ptfe reached maximum by air cooling and the abrasion loss also reached maximum among three ones ; at the same time, the abrasion loss of solid lubricant sample was also the biggest among three ones ; when solid lubricant matched with 45 # steel axle or gcrl5 steel axle, lubricant transfer film could be formed on metal surface, thus direct contact between the surface of metal friction pair rings was reduced. their working life was elongated extremely ; there was mainly much graphite, a little ptff, moo3, feso4, cus and so on in lubricant transfer film
試驗結果表明:所選原料的尺寸、形狀及純度可滿足固體潤
滑劑的性能要求;聚四氟乙烯樹脂熱分解溫度超過400 ,但在ptfe中加入無機填料會使復合材料吸水率提高,熔融溫度及分解溫度降低,且伴有氧化分解反應;碳纖維表面含有c = o及c - o - c等極性基團,有利於提高其與其它組分的相容性,提高層間剪切強度;均勻設計試驗方法能夠用較少的試驗次數找出配方與摩擦性能間的關系,擬合曲線基本能表示各配方的摩擦系數發展趨勢;配方中不加銅粉或不加石墨,其摩擦系數均較高,說明銅粉和石墨應該配合使用;當銅粉15份、石墨60份時,銅粉30份、石墨30 - 40份時,銅粉60 、石墨15 - 30份時,摩擦系數均具有較低值;純聚四氟乙烯樹脂在空氣冷卻時結晶度最大,磨損量也是三者中最大的;同時,固體潤
滑劑試樣在空氣冷卻時的磨損量也是三者中最大的:不論是固體潤
滑劑與45 #鋼軸配副或是固體潤
滑劑鑲嵌入銅套后與gcr15鋼軸配副,在金屬表面均可形成潤
滑轉移膜,從而減少金屬摩擦副表面間的直接接觸,大大延長其使用
壽命;轉移膜中主要含有較多的石墨、少量聚四氟乙烯、 moo 。
05. 02 test method for life performance of automotive wheel bearing greases
機動車輪軸承潤
滑脂的
壽命性能的試驗方法
Standard test method for life performance of automotive wheel bearing grease
汽車輪軸承潤
滑脂
壽命性能的標準試驗方法
Radial usually adopts wind axis with grease lubrication, within its longevity, need not use lubrication, can collocate constant lubricating cap according to requirements and adopt thin oil to lubricate
軸承通常採用油脂潤
滑的流動軸承,有效
壽命期內無需添加潤
滑脂,並可根據要求配置油位恆定的油杯,採用稀油潤
滑。
Friction can be considerably reduced and the life of the machine prolonged by careful lubrication
仔細潤
滑機器,能大大減少磨擦而延長機器的
壽命。
Also the fill medium can lubricate the internals and provide a longer gauge life
通過向表內充油,對儀表內部零部件起到潤
滑作用,延長了儀表的適用
壽命。
On huashou ' s clinical treatment characteristics
論元末名醫
滑壽臨證治驗特色
The study on all chen shouqi ' s life and his works
滑壽生平與著述考略
Make a brand with character, " when beautiful nimble " card report motor - car has the outward appearance novel and pure and fresh, the operation is handy, on the safe side, ride travel is comfortable, noise is low, service life is long, cost can be low, free from contamination, intelligent control, driving moment is big, climbing capacity is strong, glide performance is good, protective function is much, the characteristic such as function stability, once put in the market times accept consumer favour, make strong brand quickly
以品質打造品牌, 「佳捷時」牌電動車具有外觀新穎清新,操作簡便,安全可靠,騎行舒適,噪音低,使用
壽命長,耗能低,無污染,智能控制,驅動力矩大,爬坡能力強,
滑行性能好,保護功能多,性能穩定等特點,一經投放市場就倍受消費者青睞,迅速成為強勢品牌。
Since ureido - dcarbamido grease with high dripping temperature, long life, withstand high temperatures, high - speed, anti - water, it has broad industrial applications, but the ability of resisting high pressure is not well which limit its development more or less
由於脲基潤
滑脂具有滴點高、使用
壽命長、耐高溫高速性、抗水性等優點,使其在工業上具有廣泛的應用,但脲基脂本身的極壓性能不高等缺陷在一定程度上限制了其發展。
According to achievements in research, using face - radial sealing structures can adapt to the developing trend of increasing rotary speed of cone bit to a certain extent in lubricating system of bearing seal, which is cramp to bit service life
本文的研究表明,在偉l ]約鉆頭
壽命的軸承密封潤
滑系統中,採用端面一徑向組合密封結構能夠在一定程度上適應牙輪鉆頭轉速提高的發展趨
In addition, instead of portal brake of j93 - 1000b model, the brake device of j93 - 1000c changes into rushing board brake, thus the dependability of braking is consumedly advanced, being convenient to adjust, and the rigidity strengthening of plate design reduces the vibration noises during the working of press. with cast steel as the material of slide, slide weight of j93 - 1000c model is increased 1 thousand kgs than j93 - 1000b model with nodular cast iron as material. plus that the width from front and back of frame upright post of j93 - 1000b model is 750mm, while its 1000mm for j53 - 1000c model, increasing 250mm than the former
J93 - 1000c螺桿螺母螺旋副使用壽命及螺桿的剛度也增加剎車裝置由原j93 - 1000b型門剎車改為j93 - 1000c推板式剎車,制動可靠性大大提高,而且便於調整,平臺設計剛度增強降低了壓力機工作中的振動噪聲j93 - 1000c型滑塊支背材質鑄鋼j93 - 1000b型的為球墨鑄鐵而且j93 - 1000c型滑塊重量比j93 - 1000b型增加1000公斤, j93 - 1000c型機架立柱前後寬1000毫米比j93 - 1000b型機架立柱前後寬750毫米增加250毫米, j93 - 1000c機身重46 . 8噸, j93 - 1000b整體機身重38 . 5噸。