Cylindrical grinder main shaft grinds repair dug

My company bought breakdown phenomenon in September 2007 a model is factory of Shanghai machine tool the cylindrical grinder of MC1363/4000H. This grinder emery wheel wears main shaft to use move, static control bearing construction, in the oil pocket that hydraulic pressure oil enters bearing to cover from path of oil inlet pipe, make bearing is covered thereby and form between main shaft static press bearing, bearing covers Zun Duan to use framework oil seal to be opposite main shaft and static press bearing to have hydraulic pressure sealed. Because main shaft is long,high speed moves, make with the framework oil seal that presses oil of bearing hydraulic pressure at close Feng Jing main shaft (contact a part with framework oil seal) got abrade, abrade give a few deep trench. Come so, main shaft is met in oil of the hydraulic pressure in normal movement from main shaft " get hurt " dew is in discharge comes out, create the appearance such as dirty chaos of equipment leakage oil, spot. 2.

This equipment uses breakdown analysis and solution frequency is tall, use time is long, the maintenance before Jiashangzhi is undeserved, once emery wheel wears oil of main shaft leakage to change often sealed static the framework oil seal that presses bearing, the main shaft that makes contact a part with framework oil seal gets serious and abrade. Although change,framework oil seal also cannot check main shaft leaks effectively now oily problem, equipment stops a stage to cannot be used thoroughly. Two maintenance program listed below: (1) plan one: The inside that in the Zun Duan that holds position of framework oil seal, main shaft Zun Duan builds adds a spacer (see a picture 1) , make by oil seal abrade the place of deep trench is held off with spacer or stagger, because main shaft left carries a lid to assemble positional place to be restricted, spacer ply cannot too thick, but should assure again can abrade the position of deep trench keeps away from, reason computation design makes a special spacer, if pursue,2 are shown. Because the space is limited, external diameter of framework oil seal is largish, can handle slightly, make oil seal enters bearing to cover (φ 160mm) in shallow chamfer of Zun Duan. Graph 1 emery wheel wears partial main shaft to assemble signal 1.

Main shaft 2.

Emery wheel 3.

Add spacer newly 4.

Framework oil seal 5.

Bearing 6.

Housing pursues 2 add spacer newly to be able to assure already so sealed can shun much maintenance work again, more the charge of can managing your writing. Nevertheless this plan also has insufficient place. We know, although this plan is pretty good, but cannot from go up at all solve a problem: Once main shaft again by abrade, because the space is too little, spacer cannot increase ply without limit, this plan also lost a sense. (2) plan 2: Disassemble emery wheel wears main shaft, the deep trench with v abrade main shaft, the grinding after v; Plating of the gush after perhaps disassembling. This breakdown chooses gush plating, fabricating undertakes even after gush plating, the requirement that tolerancepublic errand spends to precision and coaxial in grinding process is quite strict also, after main shaft rehabilitate ends, can install restore to use. Process of this plan maintenance is more complex, time limit for a project is longer, but precision of geometry of the grinding spindle after restoring can assure. This emery wheel wears main shaft to be different from MQ1350 common cylindrical grinder. The emery wheel of MQ1350 wears main shaft is 2 sliding bearing after outfit is advanced in, every bearing is comprised by 3 sector plain bearing liner, each other becomes 120 ° , each by bearing of bolt of head of a ball. The discovery in working because bearing clearance is undeserved and influence grinding quality, but readjust. And the main shaft in MC1363 cylindrical grinder is to move, static press bearing bearing, cannot mechanical adjusts main shaft clearance. Bearing of main shaft of emery wheel wearing is lubricant use filmy feedback implement PS, and have independent gasoline tank lubricate for grinding spindle bearing, it is by gear pump provides pressure, pressure controller controls regulating system pressure. When systematic pressure ＞ 1.

When 4MPa, electric hair dispatch states lubricant system is regular, right now emery wheel wears main shaft to be able to be started. Disassemble main shaft, assemble resume a course more complex, bearing covers clearance and filmy feedback implement it is normal to ensure, because of bearing clearance or big or small have a bit inadvertent, can cause bearing to cover " hold an axis in the arms " , can appear even " warm up have a fever " phenomenon. Accordingly this plan asks to skill of maintenance technician technology opposite taller, assemble bearing of the main shaft in resuming a course, main shaft to restore to press difference to lubricate with activity hydraulic pressure wait for an element particularly crucial. 3.

This second maintenance uses maintenance effect plan 2, what because do it,the maintenance before uses is plan one. It is normal to be used after rehabilitate of main shaft of MC1363 cylindrical grinder, the effect is very good, the main shaft when the job does not leak oily, movement is smooth, jumpy precision qualification all is in main shaft radial and axial 0.

005mm less than. Through in last few years production uses proof program one most apparent, not only the effect good and maintenance is fast, the procedure is simple, but have its oneself limitation. The maintenance method of 2 keeps program most, most reliable also, after all of main shaft wear away to be able to restore partly, but this plan maintains cost bigger, maintenance is periodic and longer. In maintaining a course, need to decide according to actual condition adopt which kinds of plan most appropriate. Origin: Author of Inc. of group of Nanyang explosion proof: Luo Zhen CNC Milling CNC Machining