How does scroll bearing come true decrease brace up fall the target that a confusion of voices improves life (on)
- source:NEWRGY CNC Machining
The current situation Normal > scroll system to bearing life is in theoretic be next to inner ring to discharge the 2nd, supervise in national bearing quality examine the center is supervised nearly 3 years selective examination in life test, scroll body destroys the proportion that holds bearing invalidation a cycle of songs in a traditional opera to be respectively: Was 80 ％ 2000, was 36 ％ 2001, was 31 ％ 2002, although be in step down, but scale still comparatives tall, and product of foreign famous brand is destroyed because of scroll body and the scale of invalidation is inferior however, it is in some experiments even 0. Normal >2002 the end of the year is supervised examine center, right domestic and international the life contrast that the bearing of a few model undertakes experiments eventuate: Deep trench ball bearing 6208, 6304, 6307, circumstance of 6311 life test is, 4 model in 9 groups of bearing, it is good to have a type at abroad (SKF, NSK) sample, 3 type life under foreign sample; Home 6208, 6304, 6307 reliability Re are less than 90 ％ , in experiments 77 home bearing, the bearing of steel ball invalidation 8, in the 73 abroad bearing of the experiment, steel ball did not produce invalidation. The autocycle that experiments at the same time experiments in all with 63/28 bearing 9 groups, k from 1 ～ 25, have ＞ of 4 groups of K 12, 90 ％ of Re ＞ . K of experiments tapered roller bearing is 1.
33 ～ 3.
65, reliability Re is 90 ～ 99.
99 ％ . Can see home rolls body life and dependability and abroad still have difference, but at the same time, through the ceaseless effort of scroll body industry, also had certain quality level. 2.
The main factor Normal > from the case study that brings about scroll body to destroy, basically be: Normal Align=left> (1) the composition of raw material rolled steel, be mingled with and organization are loose reach mass; Normal Align=left> (2) scroll body hardness; Normal Align=left> (3) microstructure of scroll body metallographic; Normal Align=left> (4) appearance of form of scroll substance appearance and quality; Normal Align=left> (5) condition of stress of scroll substance appearance; Normal Align=left> (6) wellability of scroll substance appearance and lubricating film; Normal Align=left> (7) burn of grinding of scroll substance appearance and soft spots; Normal Align=left> (8) scroll body accuracy class; Normal Align=left> (9) roller protruding, protruding spends value short of to design a requirement; Normal Align=left> (10) roller is differred in group. CNC Milling CNC Machining