Carbon fiber composite material is gotten cut treatment to divide a blemish to study progress
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The cutting mechanism of CFRP is in 1983, koplev undertake earlier experimenting study to process of carbon fiber cutting, pointing out CFRP to cut bits basically is rupture by the brittleness of material form. D.
H.
Wang right one-way undertake to carbon fiber composite material with how orthogonal cutting experiments, studied different fiber way forms the influence of the mechanism to cutting bits. Comprise by the colophony matrix of the carbon fiber of brittleness and tenacity as a result of carbon fiber composite material, both intensity limit differs very big, former be latter a certain number of times, wait because of this scholar Zhang Houjiang think to be able to simplify its in cutting process the cutting that the ground regards as is pair of carbon fiber only, and the cutting oversight to colophony matrix. Graph the cutting process document below θ is opposite deflection of 1 different fiber the direction of fiber lay up of a few models undertakes study, composite material of summary carbon fiber is in the form figuration pattern that different fiber deflection cuts bits below θ (see a picture 1) . When θ =0 ° , the formation that cuts bits is cutting tool passes what depart cut material and base material ceaselessly and come true. This kind of cutting is out of shape the form calls the depart between the layer model. When ≤ of θ of 0 ° ＜ when 90 ° , to in an attempt to 1 in θ =45 ° and θ =90 ° are a delegate, blade of cutting tool cutting is in to the elbow action of carbon fiber composite material fiber interior is formed perpendicular the cutting at fiber oneself axes stress. When cutting stress to exceed limit of fiber shear strength, fiber is cut off. The fiber after cutting off falls in the elbow action of face of the knife before cutting tool, edge fiber direction produces slippage. When the shear strength limit that when the cutting between the fiber interface that slippage causes stress exceeds matrix colophony material, the fiber that be cut off and other staple are detached, form cut bits. This kind of cutting is out of shape the form calls fiber to cut off model. When ＜ of θ of 90 ° ＜ when 180 ° , to in an attempt to 1 in θ =45 ° is a delegate, cutting tool brings about the depart between the layer between composite material to the elbow action of front material. Material of cutting tool front happens below cutting tool action bend, when the flexural strength limit that curves stress to exceed carbon fiber composite material, bottom happening ruptures. Cutting tool continues to advance, cutting tool is strengthened to action of elbow of its front material, rupture when front material bottom of bit of place when cutting stress to exceed limit of data shear strength, happen cut rupture, form cut bits. This kind of cutting is out of shape the form is called bend cut cut type. Graph 2 those who get passageway of the aperture when cutting CFRP is statified mechanism sketch map 2.
Statified generation mechanism analysis is statified it is to show by the come unglued between the stress between the layer or the production blemish composite material lay up that cause depart destroys a phenomenon. Consider to make clear, auger in cutting course of carbon fiber composite material statified blemish can divide injure a mechanism for two kinds: The entrance comes off statified with exit the top goes out statified (see a picture 2) . Getting in cutting a course, on one hand, when broach horizontal stroke blade begins to contact material and advocate when cutting blade unfinished cuts material completely, cutting force can turn the material that is excised helix chamfer. These material can rise along helix chamfer surface before cut off, generation up come off force. The area that comes off force can make superstratum was not excised produces depart, it is namely come off statified. On the other hand, when the horizontal blade of broach is about to get a data, the material number of plies that did not excise as a result of material the rest is less and less, when strength combining between the layer that exceeds material in axial force, exit happens to stick a phenomenon between circumjacent lay up and cause a top to go out statified blemish. The top gives statified in the area between the layer happening, accordingly it depends on not only fibrous property, and concern with resinous property. Produce mechanism to storied, zhang Houjiang through acoustics microscope the analysis points out, CFRP plank gets side of the entrance that cut hole and export side to have statified, entrance side is statified for the circle, export side surface layer is statified for elliptic, depth is statified for cirque model; What same hole exports side is statified what be more than entrance side far is statified. Graph 3 statified influence of influencing factor of storied of factor token sketch map is gotten cut statified the element of blemish has a lot of, include property of cutting parameter, cutting tool, material, workmanship to wait. These are put in the relation of mutual coupling between influencing factor, and getting the effect that the element still cannot be controlled more very much in cutting a course. Current, domestic and international scholar studies more is the influence of cutting parameter and blemish of layer of cutting tool bisect. Consider to make clear, getting the axial power in cutting a course is to bring about statified the mainest reason of blemish. Getting in cutting treatment course, when axial force exceeds a threshold values, statified blemish can happen. Among them, horizontal blade countershaft is occupied about to the contribution of force 60% the left and right sides. 1.
Variable of parameter of cutting of cutting parameter influence basically includes F of cutting speed, feed (every tine feed Fz) wait for an element. Cutting speed and feed are to get variable of two in cutting treatment course main parameter. Consider to make clear, the influence of blemish of feed bisect layer is more than cutting speed. Ant ó Nio T.
The cutting that the Marques bit that uses 4 kinds to differ studied to its fall in different cutting parameter machines function. The experiment makes clear, parameter of logical choice cutting can reduce axial force, reduce then statified blemish influence. The experiment considers to point out with 0.
The material of cutting rate cutting of the feed speed of 025mm/r and 53m/min can make axial force is mixed statified factor is achieved the smallest, statified factor drops probably 4%-5% left and right sides. V.
N.
Gaitonde with hard alloy broach (K20) undertake getting cutting machining experimenting study to carbon fiber composite material, the result makes clear statified the trend is reduced as the addition of cutting speed, and use low feed and vertex angle can reduce statified factor. Zhang Houjiang use broach of all sides of YG6X whole hard alloy to get when cutting CFRP, discover feed to be shown to influence of each storied between the layer on sunken curve. In feed very hour, feed increases statified dimension is reduced; When feed exceeds, feed increases, each statified dimension rises. Because this is to produce feed of the smallest storied, it is a critical value. The Vijayan Krishnaraj cutting that uses broach of K20 hard alloy to study carbon fiber composite material below the circumstance of rotate speed of different main shaft and feed machines function. The experiment makes clear, entrance side comes off statified there is clear rule between factor and feed rate, but from look on the whole, of low feed rate statified what factor is less than tall feed rate is statified factor. Export side top goes out statified factor increases as the addition of feed rate and main shaft rate. Feed rate is to export side top to go out statified the main influencing factor of factor. The contributive rate of feed rate is 51.
4% , and the contributive rate of main shaft rotate speed is 35.
42% . The experiment still gave out optimum feed rate and main shaft rotate speed, it is respectively 0.
137mm/r and 12000r/min. 2.
The influence of cutting tool belongs to typical difficult treatment material as a result of carbon fiber composite material, and bore treatment is belonged to close partly treatment, a large number of heat that cutting produces in treatment process are cut not easily bits and cutting tool are taken away. Accordingly, get those who cut treatment to bring about cutting tool easily to wear away. Of cutting tool wear away to affect the quality that make hole not only and also can affect the efficiency that make hole and raise finished cost. The influencing factor of cutting tool basically includes parameter of coating of appearance of cutting tool geometry, cutting tool, cutting tool to wait. Because bring about statified the effect that the critical axial force of blemish suffers cutting blade, because structure of geometry of this cutting tool is statified to reducing,blemish is having main effect. Lu í S Miguel P.
Dur? O studied 5 kinds of cutting tool: Twist drill of twist drill of 120 ° vertex angle, 85 ° vertex angle, toothed get, getting of dagger getting, a flight of stairs. Consider to make clear, of twist drill of 120 ° vertex angle statified factor is the minorrest, what a flight of stairs gets is statified factor take second place, and with twist drill of 120 ° vertex angle statified factor differs not quite. Statified factor is the biggest for toothed auger, achieved 1.
23 the left and right sides. Accordingly, it is twist drill of 120 ° vertex angle according to cutting tool of first-rate of this experiment condition, a flight of stairs gets take second place. To cutting tool of hard alloy coating, current and commonly used basically have common coat (like AlTiN) wait for a type with diamond coating. The contrast such as Xin Wang tries the cutting tool that check studied to 3 kinds differ: Not broach of broach of coating hard alloy, diamond coating hard alloy and broach of AlTiN coating hard alloy. Test result makes clear, diamond coating can show those who reduce cutting tool to wear away, however because broach of AlTiN coating hard alloy is being gotten oxidation phenomenon appears in cutting a course and fail to reduce cutting tool effectively to wear away rate. The broach of hard alloy of coating of the rice that use offer such as Redouane Zitoune folds a material to undertake getting cutting machining to carbon fiber and aluminium alloy. They point out, getting in cutting CFRP course, use accept rice to besmear broach can show a hard alloy to reduce surface roughness and axial force. Of axial force reduce OK and effective precaution to get in cutting a course statified blemish. 3.
Influence of other influencing factor is statified the element of blemish is very much, still have other and main influencing factor besides the cutting parameter of afore-mentioned extensive research and cutting tool, for instance of material beforehand the influence of macerate means, feed hole, influence of bolster plate, new technology. The contrast such as Islam Shyha analysed 3 sort model beforehand macerate material (977-2/HTS AC, 8552/AS4 AC, MTM44-1/HTS OC) the influence that cuts a course to getting. Research makes clear in entrance side statified blemish, beforehand the contributive rate of macerate means is 12% ; However, exporting side statified blemish, beforehand the contributive rate of macerate means has been as high as 38.
5% . Additional, 8552/AS4 AC beforehand of dip material statified factor is bigger, give rate in Gao Jin especially (0.
4mm/r) below the circumstance, this phenomenon is more apparent. C.
C.
Tsao and H.
Hocheng studied the influence of blemish of layer of feed hole bisect, among them the diameter of feed hole and the internal diameter that cover makings getting are equal. Test result makes clear, although force of statified and critical axial is reduced as a result of feed hole, but get the axial power in cutting a course also as a result of the purify that cuts bits reduce greatly. Control the specific value of diameter of prefab feed hole and bore diameter, composite material of treatment carbon fiber can be cut in run the drilling tool into the well of bigger feed circumstance and do not appear statified blemish. C.
C.
Tsao and H.
Hocheng is installed by treatment material bottom through be in bolster plate, study the effect of blemish of its bisect layer. They are pushed above all derive toothed the model of force of statified and critical axial that get and covers makings getting to take bolster plate getting to cut is formulary, undertook experiment test and verify subsequently. Consider to make clear, installation bolster plate is OK relatively the bore quality with did not install bolster plate to obtain better. In recent years, the researcher is cutting the mechanism that make hole to undertake many research foundation go up to getting, experimented a few new methods that make hole and data processing technology, obtained certain positive result. The article makes aperture technology and suture technology be with helix milling exemple. Helix milling makes aperture technology is the method of new-style cutting treatment that uses milling principle to undertake making hole. In helix milling process, get different aperture through changing the ask eccentric throw of cutting tool and aperture axes, because this can realize what same cutting tool is aimed at different aperture make nest of Kong Ji Huo machine, reduced finished cost thereby, rose to machine efficiency. Wang Ben cut treatment with tradition getting to consult, use helix milling to reach tradition getting to cut two kinds of methods to undertake to C/E composite material aperture experiments making respectively, get the athletic contrail that cuts cutting tool to undertake an analysis to helix milling and tradition. The result makes clear, cutting temperature is the main factor that affects C/E composite material to make aperture quality. Because, the cutting temperature when helix milling makes hole is more traditional auger 69 ℃ above is reduced when cutting, fall be more than 36% , tear off because of what this avoided effectively to make aperture exit reach statified phenomenon. Suture technology shapes as liquid of a kind of composite material the method that the significant link of prefab body enhances, its principle is to adopt suture measure, make composite material is in perpendicular at lay up planar direction gets buildup, increase allowance of the loss between material layer thereby. Cross the suture that enhances fabric ply way to be able to improve the performance between the layer of composite material greatly. The experiment such as Yosra Turki studied suture and did not oversew of composite material auger cut treatment function. The result makes clear, suture material reduces respect comparing to did not oversew in exterior quality and blemish material has very big improvement. Sutural make the generation between the layer reduces effect and the propulsion in broach in the process, block up its are detached. Accordingly, what suture technology can decrease to be brought about by axial force is statified blemish and matrix burst. K.
T.
Tan still studied the destruction of suture density and sutural ply to carbon fiber composite material form and the influence with characteristic invalidation. Graph 4 areas law is statified factor token sketch map is statified of blemish detect to detect statified the degree of blemish, domestic and international researcher considered to experiment to allow a variety of methods. Zhang Houjiang use chloridize gold to permeate fluid to detect the law is gotten earlier to carbon fiber composite material cut make hole statified blemish undertakes detecting. Check checks the discovery in check, statified the appearance of blemish basically has mix elliptically approximately approximate circle two kinds, both center with aperture center coincide. Subsequently, they use acoustics microscope again statified to bore of carbon fiber composite material blemish undertakes detecting, check test result and analysis according to check, summary went out stereo and statified model, and bisect layer formed mechanism to undertake discussing. To avoid to be opposite material produces factitious loss, nondestructive detects the technology is in statified blemish detects the respect got be applyinged extensively. The nondestructive that uses at present detects the technology basically includes acoustics microscope, supersonic C technology of photography of fault of computer of ray of scanning, X, enhance ray to take a picture the law. Zhou Zheng doing be based on laser supersonic technology, opening of close to composite material firm is statified undertake token experiments quantifying; Be based on through transmission technique and pulse bounce technique to undertake laser supersonic C scanning detects, get tightening firm opening area statified the appearance of blemish, dimension and positional feature. Study the result makes clear, use laser the blame contact of supersonic technology is aroused, receive and high resolution characteristic, OK and accurate measure closely firm opening area is statified the wave reflex that blemish brings about and attenuation, the close firm opening of structure of composite material of effective token plane is statified blemish. C.
C.
Tsao and H.
Hocheng uses technology of photography of fault of X ray computer and technology of supersonic C scanning these two kinds of nondestructive detect blemish of technical bisect layer undertakes detecting. The result that test result indicates to technology of technology of photography of fault of X ray computer and supersonic C scanning is measured is very adjacent, these two technologies can announce different cutting tool is statified the critical axial power that produce. However technology of photography of fault of X ray computer is statified to detecting blemish is more agile and effective. Epilogue as requirement of taller and taller to demand of performance of carbon fiber composite material, work more and more slashing, to carbon fiber composite material the quality that make hole asks taller and taller also. Statified as get one of leading defect in cutting the course that make hole, domestic and international scholar had produced mechanism and influencing factor to have thorough research to its. Choosing cutting parameter and the cutting tool that use different geometry appearance and coating through actorring or actress chemical combination manages is to decrease at present statified the efficient way of blemish. Be opposite domestic and internationally through be opposite carbon fiber composite material is statified the research current situation of blemish undertakes summing up, will increase pair of carbon fiber composite material to make hole from the following respect henceforth statified the research of blemish: Continue to study new cutting tool is reached optimize parameter of structure of cutting tool geometry in order to improve its cutting performance; Have thorough research to composite material, improve workmanship, improve material performance; Build perfect, reasonable emulation model, with period achieve bisect layer blemish more accurate forecast. CNC Milling