Abrasiveness of attrition of surface of laser tiny model can study

Be considered as method of a kind of particularly applicable exterior tiny model. 20 centuries 90 time later period, german Gehring company advances idea of technology of honing of cylinder bushing laser (Laser Hoping) , the laser that uses high energy density bundle.

Have the laser score of workpiece surface, form regular honing groove, with improving lubricant condition significantly. The application of German Gehring company and company of Austrian Opel Powertrain considers to make clear, compare with the engine posture that adopts platform honing cylinder bushing, use laser honing cylinder bushing, can make of engine wear away, the function index that discharges the respect such as the bad news that reach oil gets clear improvement. In recent years, early or late the scholar began technology of laser tiny model to be in a few important attrition deputy, if cylinder bushing is piston annulus, mechanical sealed, and thrust bearing, wait for the applied research of the respect. 8 〕 of document 〔 consider to show attrition deputy surface uses processing of laser tiny model to be able to get used to high speed, burden and circumstance of tall viscosity lube well. Domestic grove light studied shape of IAG laser reticulation quenchs processing technology, through " of a lot of pool of " small oil is being formed on cylinder wall, be helpful for piston annulus and cylinder wall between lubricant. Function of the lubricant anti-friction for deputy surface of attrition of assessment laser tiny model, wear-resisting, article author uses cylinder bushing of engine of " reciprocating type / piston annulus attrition wears away " of imitating test device, mix to test specimen of smooth cylinder bushing respectively test specimen of laser reticulation cylinder bushing, in 3 kinds condition of different operating mode falls, undertake comparative experiment studies performance chafing wearing away. 1 experiment condition and method 1.

Preparation of 1 test specimen considers to use mode of light beam of laser of equipment of tiny model of laser of Nd; YAG of diode pump riverside to output wavelengh to 1 064 Nm and 532nm 2 are planted for TTM00 originally. Use acousto-optic laser of pulse of generation of tone Q control, tone Q repeats frequency 1~50 KHz. M2 of coefficient of quality of beam of light<2, horn of disperse the internal heat with sudorifics is less than 3 Mrad, pulse width is less than or be equal to 70 Ns. This equipment is had multidimensional workbench linkage, and the function such as control of linkage of a powerful person of electric machinery of tone Q switch, servo, gas, smooth brake, can control the output of individual laser pulse accurately. Use optimized laser technology parameter and specific auxiliary technology measure to undertake laser tiny model is machined. The surface that wins design place demand is microcosmic geometrical form appearance, pass polishing processing, with purify laser the burr of the small generation that add land and sort of slaggy test specimen are reached cease if the requirement expresses 1 to show an experiment to wear away with cylinder bushing if test specimen pursues 1 is shown. Use the reticulation of surface of test specimen of laser modelling cylinder bushing that WykoNT1100 measures and three-dimensional form appearance, the result is like graph 2 (a) , (B) place is shown.

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Experiment of 2 test facilities uses cylinder bushing of engine of reciprocating type of " of Hefei industry university / piston annulus attrition wears away " of imitating test device it is collect pressure, speed and for oil adjustable measure with attrition force, temperature wait for a variety of functions to wear away at the attrition of an organic whole experimental equipment. Testing stand is main the structure is shown 3 times like the graph. The orgnaization of brace slide block of reciprocate of implementation of in order to is taken from one actual internal-combustion engine lever of crankshaft in succession one piston system, brace by electric machinery drive. One senior staff and clamping apparatus are secured to drive test specimen of fluctuation piston annulus and test specimen of fluctuation cylinder bushing to make sliding friction on the piston.

) the grease cup that lube measures by one adjustable oil sends to attrition surface.

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Can comparative experiment is in abrasiveness of attrition of 3 experiments method undertake below 3 kinds of different operating mode, specific if express,2 are shown. Wear away after polish of all test specimen classics before the experiment are handled, supersonic clean, clean sample piece with acetone, blow after working, say to weigh with balance (take 2 times say to all be worth) again. The experiment carries leverage to load, the load of practical effect on test specimen is 68.

6N. Above all to load 9.

8N, 600 R/min of brace rotate speed, run add up to 1h. Run add up to the timing after finishing to require a cost to place, the to load that pursue course requires a cost to place. Every time load increases 4.

9N, every class load runs 30 Min at least. 10 H runs continuously again after load adds set to be worth. In whole to load and normal tatty process record attrition temperature changes and the change of attrition force. Experiment every time after the end, clean test specimen with acetone blow after working, say to weigh. Middleman and guarantor of whole experiment process holds lube to supply speed changeless () of 4-5 S/ drop. 2 tests result and analysis 2.

1 experiment operating mode is to the influence of attrition factor below condition of different operating mode, if graph 4-6 place is shown,attrition factor parts along with load change circumstance. From the graph 4 can see, below low speed condition, to not test specimen of modelling cylinder bushing, attrition factor follows the accretion of load and increase and to test specimen of modelling cylinder bushing, attrition factor follows the accretion of load and reduce. Show the accretion as load, the pressure of surface of test specimen of smooth cylinder bushing increases end model, appear by the squeezes an effect to cause lean oil phenomenon of lube, cause attrition factor to increase. From the graph 4, 5 can see beginning gradually in the process of to load, the attrition factor of modelling surface should is more than not modelling surface, as a result of,this is low when carrying, although exterior lubricating oil is enougher, but in the dynamic pressure when low speed is lubricant effect is not apparent, the tiny reticulation burr that laser small treatment brings can increase the addition of attrition obstruction; as load, reticulation burr is ground gradually smooth, because the reticulation groove of surface of modelling cylinder bushing has oil storage effect, its improvement is lubricant, the effect that reduces attrition is more and more distinct; falls in middling speed condition, factor of attrition of surface of modelling cylinder bushing slightly under not test specimen of modelling cylinder bushing from the graph 6 after can seeing when sliding velocity progress increases, because the dynamic pressure of reticulation oil storage is lubricant effect is more distinct, make the attrition factor of modelling cylinder bushing obvious be less than not test specimen of modelling cylinder bushing (show) 6 times like the graph, with not photograph of modelling test specimen is compared, attrition factor reduces 23 % . Discovery is returned in the experiment, below high speed condition, to not test specimen of modelling cylinder bushing, come when to load when 4 ~6 N, appeared abrade phenomenon, reason stops to continue to load. Demonstrative modelling cylinder bushing relatively not test specimen of modelling cylinder bushing has higher carrying capacity to still can see through comparing graph 4~6, as the addition of sliding velocity, not the aggravate of lean oil phenomenon of modelling cylinder bushing, attrition factor is shown increase a current. And to modelling cylinder bushing, as a result of the oil storage of reticulation groove, action that offer oil, the addition of sliding velocity is helpful for heightening dynamic pressure instead lubricant effect. 2.

The influence experiment operating mode to attrition temperature is opposite 2 experiments operating mode if the influence of attrition temperature pursues 7 are shown. To laser modelling test specimen, as the addition of load or sliding velocity, friction work cost raises, consequently attrition temperature also increases gradually. 2.

3 experiments operating mode affects experiment operating mode to if the graph is shown 8 times,be affected to test specimen tatty to test specimen tatty. Of surface of test specimen of cylinder bushing of the modelling below circumstance of burden high speed wear away form appearance is shown 9 times like the graph. Can see test specimen surface still maintains bright and clean level, grind mark lighter, reticulation groove brim did not appear burst apart fall off phenomenon. Below all sorts of operating mode, the wear extent of modelling cylinder bushing all under not modelling cylinder bushing, below condition of burden high speed, wear extent can be reduced 66% . Research shows in attrition deputy surface has laser tiny model, can marked improvement is lubricant, reduce wear away, its action mechanism depends on: (The laser reticulation groove that 1) forms in attrition deputy surface is helpful for forming the dynamic pressure oily film that has certain ply, stability, form dynamic pressure thereby oil path of groove of reticulation of lubricant;(2) laser, connect each other through falling justice point, reduced the occurrence of lean oil area, reduced groove of reticulation of adhesive wear;(3) to have collect the action that wear bead.

Reduce greatly grind bead to wear away;(4) is in groove of reticulation of laser small treatment while, material also got laser photograph becomes sclerotic to handle all round, raised anti-wear properties thereby can. 3 conclusion can contrast through attrition abrasiveness experiment, after indicating laser model, the reticulation groove that cylinder bushing surface produces has oil storage, accumulate bits and dynamic pressure lubricant action, can improve lubricant condition significantly, reduce attrition to wear away greatly, those who be expected to be used at the surface inside internal-combustion engine cylinder bushing is artful grind processing, in order to reduce attrition, improve the mechanical efficiency of internal-combustion engine and environmental protection performance. Technology of laser tiny model has larger technical dominant position.

The promotion with important attrition deputy surface waits to have better in bearing of cam, crankshaft, thrust and seal ring applies foreground. CNC Milling CNC Machining