Cutting of standard dry form (Near Dry Machining) lubricate with minim system (MQL)

  • Time:
  • Click:93
  • source:TAMIKO CNC Machining
Definition, concept: Do type cutting definitely: It is cutting of relatively dry type is mixed wet cutting, it is a lube, when cutting is machined, lube forms an oily film between cutting tool and workpiece, protect cutting tool and work, avoid generation of quantity of heat, raise workpiece to machine precision, it is especially in accurate treatment. Minim is lubricant system: Say simply even if the fuel injection device that rigid control oil measures, divide normally the fuel injection outside be and inside fuel injection device. Fuel injection device is lube is mixed outside compress air to adjust independently respectively, compress air to carry lubricating oil high speed air current to be blown to cutting edge in nozzle exit, achieve lubricant effect. The mechanism Normal Align=left> cutting basically has two effect in metallic cutting, it is lubricant action; 2 it is cooling action. Cutting fluid whether the lubricant action with sufficient significant play, its permeate ability to lose by force is a main factor. Groovy pouring the osmosis of type cutting fluid in cutting treatment permeates with the liquid and gas permeates two kinds of means to undertake: Pouring liquid permeates efficiency inferior, lead in effectiveness for a given period of time of high speed cutting lower; As a result of,gas is permeated is pouring the liquid in crackle of the surface that cut bits produces vaporization as the rise of cutting temperature and forward knife face undertakes osmotic. The experiment proves, the osmosis of groovy cutting fluid capability is not strong, can be measured by the liquid of vaporization very few, make lubricant effect is restricted. And the two-phase fluid that sparge refrigeration forms, what can make up for cutting fluid to permeate ability is insufficient. Eject of fluid of gas fluid two-phase arrives cutting zone time, have higher rate, kinetic energy is bigger, because this permeates ability stronger. In addition, size of liquid of the minim in enraging fluid two-phase efflux is very small, encounter the metal with higher temperature extremely easy vaporization, can permeate from face of many knives before facing cutting tool. Although the liquid quantity in efflux is very few, but be compared by the part of vaporization successive and pouring when cutting fluid much, lubricant effect is consequently better. In metallic treatment heat in metal cutting basically originates metallic plasticity is out of shape, the cooling process of cutting area is solid and fluid between conduct heat process. As a result of the appeal between fluid and solid element and fluid viscosity action, there is sluggish of a fluid to shed a layer in solid surface, increased thermal resistance thereby. Sluggish shedding layer is thicker, thermal resistance is greater, and the ply of sluggish shedding layer basically depends on the fluidity of the fluid namely viscosity. The fluid refrigeration effect with the fluid refrigeration bigger than viscosity effect with little viscosity is good. Normal Align=left> gas is ejective, bulk expands to do work external abruptly, wasted internal energy, can make temperature reduces " W:s of Value="10" UnitName=" ℃T="on">10 ℃ is controlled. Fluid of the two-phase in sparge refrigeration has higher rate, can sweep scrap in time, take away much quantity of heat, increased to drop in temperature further the effect. Accordingly, sparge refrigeration enrages fluid integratedly actually of two kinds of fluids drop in temperature the effect and advantage. Normal Align=left> are cooling the working principle Normal Align=left> sparge cools even if circulating air of pressure of minim liquid interfuse, form the fluid of gas fluid two-phase of mist shape, produce efflux through sparge, eject arrives cutting area, make workpiece and cutting tool get cool adequately and lubricating. Normal Align=left> sparge works, compress air to be enraged via dividing water filter implement filter removes the impurity such as moisture, the one fraction after carrying electromagnetism a powerful person compresses air to enter cooling fluid case inside, will cooling hydraulic pressure gives spray head; The majority compresses air classics pressure regulator valve to move pressure to 0.

32 ～ 0.

The classics after 35MPa compresses air hose to mix to nozzle and cooling fluid, the eject after pulverization arrives cutting area. Normal Align=left> sparge whether cooling fluid sufficient pulverization. Because the pressure of cooling fluid is more than slightly,reduce airy pressure, both mixes inside gas fluid mixing chamber hind, via cooling pipe of type of flexible metal conduit 5 by nozzle head ejective. Conversely, if the pressure of cooling fluid is less than,reduce airy pressure, criterion cooling fluid will be pressed to return cooling fluid case inside. In the sparge refrigeration unit in machine tool of a few entrances, compressing air is from what cooling fluid case enters after pressure regulator valve, because this is ejective,often have when cooling fluid " pant " phenomenon. If will compress air instead,from electromagnetism hind of a powerful person enters cooling fluid case directly, can avoid " pant " phenomenon. Normal Align=left> cools ejectively to adjust fluid discharge, control valve of cooling fluid discharge was installed on nozzle. The sparge refrigeration device that place of machine tool of a few entrances uses, its nozzle control valve is taper, the bulk that clearance cooperates through adjusting cone when using will adjust cooling fluid discharge. Because machine the nozzle control valve of this kind of structure to compare difficulty, of lever of a powerful person and cone of body of a powerful person homocentric degree assure not easily, cannot adjust effectively thereby the discharge of cooling fluid. The experiment proves, if change awl a powerful person smooth a powerful person, change cone plane, increase a sealing ring, criterion the discharge of cooling fluid can adjust arbitrarily. Normal Align=left>normal Align=left> the choice Normal > becomes mist state from the cooling fluid with ejective nozzle, among them major in season arrives cutting area, one fraction dispersion is in air, cause harm to handlers to avoid environmental pollution to reach, the option of cooling fluid is very important. Through using unconventional cutting liquid - the plant is oily, include fat kind, environmental cost decreases significantly. The technical advantage of these products includes to have clear lotion, separate the function of powder, low epispastic, fast deflate, catch fire the point is opposite taller and surface layer is compatible. Be based on vegetable lubricating oil but rapid by biology degradation, below most circumstance, lube is decomposed namely inside 21 days, do not have the trouble back at home of long-term cleanness so. These lube also had gotten improvement, have the characteristic of low pulverization, conduce to short-term cleanness. Normal > requirement to lubricant: Above all, the viscosity with lubricant inferior requirement. Next, lubricant has very good osmotic adhere to with the surface coefficient. The 3rd, lubricant should have super lubricity. The 4th, lubricant need is admirable extremely control function. The 5th, lubricant environmental protection, safe, but second birth (plant sex) . 4 sparge apply effect Normal WORD-BREAK of temperature of area of 1" Align=left> cutting: Break-all; TEXT-INDENT: 36pt; TEXT-ALIGN: Left; Mso-pagination: Widow-orphan; Mso-char-indent-count: 3.

0" Align=left> uses sparge refrigeration and dry cutting to machine respectively 40Cr and 45 steel (the cutting parameter that processes 40Cr steel is: Ap ＝ Value="2" UnitName="mm" W:sT="on">2mm, f ＝ Value="0.

48" UnitName="mm" W:sT="on">0.

48mm/r, v ＝ Value="167" UnitName="m" W:sT="on">167m/min) . The result that cutting area temperature checks makes clear, compare with dry cutting photograph, temperature of area of the cutting when using sparge to cool can reduce " W:s of Value="140" UnitName=" ℃T="on">140 ℃ ; If process 45 steel (Ap ＝ Value="2" UnitName="mm" W:sT="on">2mm, f ＝ Value="0.

3" UnitName="mm" W:sT="on">0.

3mm/r) , " W:s of Value="200" UnitName=" ℃ can be reduced when temperature of area of the cutting when using sparge to cool compares dry cuttingT="on">200 ℃ . Normal WORD-BREAK of fluid of Widow-orphan" Align=left> cutting: Break-all; TEXT-INDENT: 11.

75pt; TEXT-ALIGN: Left; Mso-pagination: Widow-orphan; Mso-char-indent-count: .

98; Mso-margin-top-alt: Auto; Mso-margin-bottom-alt: 7 what the newest statistic data of the country that Auto" Align=left> comes from shows the cost related to cutting fluid is equivalent to total cost.

5%-17% . As the growth of cost of oil raw material, the price that the trend is cutting fluid is in before long continue to grow in the future. Normal MARGIN-LEFT of cost of Auto" Align=left> environment: 8.

9pt; WORD-BREAK: Break-all; TEXT-INDENT: 28.

45pt; TEXT-ALIGN: Left; Mso-pagination: Widow-orphan; Mso-para-margin-left: .

85gd; Mso-char-indent-count: 2.

37; Mso-margin-top-alt: Auto; Mso-margin-bottom-alt: The health of the cutting liquid that Auto" Align=left> processing has used and the cost of long-term environment cleanness that the place that cut bits costs and worker. Because do not have cooling fluid pump, achieved managing the sources of energy so. Normal MARGIN-LEFT of life of Auto" Align=left> cutting tool: 8.

9pt; WORD-BREAK: Break-all; TEXT-INDENT: 24pt; TEXT-ALIGN: Left; Mso-pagination: Widow-orphan; Mso-para-margin-left: .

85gd; Mso-char-indent-count: 2.

0" Align=left> and cast-iron or cast steel and grinding photograph are compared, dry type cutting makes cutting tool service life increased 20% , the experiment of cutting tool service life of certain use MQL shows cutting tool life grew 50% , specific depend on treatment process, cutting speed and feed. Because MQL system will produce the oily mist that forms by tiny oil drop,this is, it goes up to cutting area through eject of cutting tool center, make cut bits to keep clear of more easily, and prevent particle sticky go up in cutting cutting tool. Normal Align=left> is in establish the rough machining on the car 45 steel cast, use bit name is YT5. When cutting condition is same, the cutting tool life that uses sparge refrigeration is 1 hour of above, and the cutting tool life when using dry cutting is 30 ～ 40 minutes only. Normal Align=left>normal WORD-BREAK with faster 49" Align=left> : Break-all; TEXT-INDENT: 29.

4pt; TEXT-ALIGN: Left; Mso-pagination: Widow-orphan; Mso-char-indent-count: 2.

45" Align=left> is passed use data of heat-resisting cutting tool, for example char content, and higher main shaft rotate speed, the speed fast 50-100% that does cutting to compare traditional wet cutting partly. Without cooling fluid pulverization, use MQL cutting, the user can maintain factory environment very clean, have aerosol and taste hardly. This is helpful for the health of cleanness and worker. Normal MARGIN-LEFT of surface roughness of Auto" Align=left> surface: 8.

9pt; WORD-BREAK: Break-all; TEXT-INDENT: 24pt; TEXT-ALIGN: Left; Mso-pagination: Widow-orphan; Mso-para-margin-left: .

85gd; Mso-char-indent-count: 2.

0" Align=left> is face of the cent in the turbine cylinder of ZG20CrMo in material of mill of the essence on numerical control planer-type milling machine, use bit name is YT535, cutting dosage is V ＝ Value="150" UnitName="m" W:sT="on">150m/min, vf ＝ Value="40" UnitName="mm" W:sT="on">40mm/min, ap=0.

02 ～ 0value="0.

04" UnitName="mm" W:sT="on"> .

04mm. When using dry cutting, machine Value="1" UnitName="m2" W:sThe razor blade after T="on">1m2 wears away, treatment surface surface roughness is not stable, for Ra2.

3 ～ 3.

4 μ M; When using sparge to cool, machine Value="1.

5" UnitName="m2" W:sT="on">1.

The razor blade after 5m2 wears away, exterior surface roughness is stable, amount to Ra0.

76 ～ 0.

9 μ M, exceed blueprint to design the Ra=1 of the requirement.

6 μ M. Normal Align=left> in addition, the different machine tool such as milling machine of boring of lathe of lathe of type of Yu Li of applicable of sparge refrigeration technology, center lathe, rotor, shroud lathe, be born, treatment efficiency rises on average 20% , cutting tool life raises one times above, treatment precision also has rise significantly. If be on rotor lathe journal of fine vehicle rotor, car of the one knife when using dry cutting does not come down, cylinder is spent assure not easily, and when using sparge to cool, one knife can the car is over, and cylinder spends contented design requirement. 5 application domain: Nonferrous metal casts the 0 accurate treatment that reach component treatment to be used at all sorts of moulds, especially the finish machining of the large mould such as the car 6 epilogue Normal Align=left> has good refrigeration and lubricant effect as a result of sparge refrigeration, in cutting sparge of the application in machining a process cools the technology can raise cutting to machine manufacturing efficiency and component to machine quality significantly. Normal >1. To cutting as a result of two-phase efflux Ou Youqing manages action, reduced oxidation skin, fine scrap to wait for pair of cutting tool wear away, can raise the durability of cutting tool; Volume of sparge refrigeration unit is minor, installation operation is convenient; Amount of cooling fluid cost is little, working environment is clean, those who be helpful for protecting handlers is healthy. Normal >2. Sparge refrigeration technology suits to be used at the calorific generous such as grinding of feed of high speed cutting, delay, heavy-cut grinding to process data of alloy steel of the high strength with circumstance and treatment precision high demand, tall hardness particularly. Normal > spray at numerical control machine tool, can implement cooling automation; If apply on general accuracy machine tool, through simplifying structure, replace the filter that divide water to enrage with switch of road of hand take offense implement with electromagnetism a powerful person, cost can be reduced while implementation sparge is cooling. CNC Milling CNC Machining