Small production technology studies titanium alloy progress and look into

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Titanium alloy is had taller than intensity, be able to bear or endure corrode sex is strong and biology consistence is good wait for a characteristic, it is the good stuff of production metal small structural member. However, low, stretch model measures titanium alloy coefficient of thermal conductivity small and chemical affinity is strong, also be typical difficult treatment material. In analytic titanium alloy small structural member machines the foundation of the characteristic to go up, by add capable person, wait for material and the figuration kind that reduce ability small to titanium alloy production technology undertook summing up, introduced respective figuration principle and craft characteristic, the future of small to titanium alloy production technology developed direction to put forward to look into. 1 preface nicety is changed, the significant progress direction that miniature is changed is modern manufacturing industry. Titanium alloy serves as a kind of important light qualitative alloy, have taller than intensity, be able to bear or endure corrode sex is strong and biology consistence is good wait for a characteristic, be considered as to make the good material of metallic small structural member. As the development of production technology, titanium alloy is sure to receive more application in the domain such as medical treatment of aerospace, biology and accurate instrument. However, low, stretch model measures coefficient of thermal conductivity of titanium alloy itself small and chemical affinity is strong below high temperature, belong to material of typical difficult treatment. In the meantime, bulk of metallic small structural member small, feature is complex, tall to precision and exterior quality requirement, use a tradition to machine craft to exist generally treatment quality difference, cutting tool wears away to wait for a phenomenon quickly. Accordingly, consider and seek efficient, high quality titanium alloy small production technology already became a current heat. The article is pressed add capable person, small production method and technology undertook the titanium alloy that waits for material and category of the figuration that reduce ability to have to showing sum up, introduced their figuration principle and craft characteristic, the future of small to titanium alloy production technology developed direction to put forward to look into. 2 titanium alloy adds capable person alloy of titanium of small production technology adds capable person small production technology is a foundation with digitlizing a model, a 2 dimension are printed below protective atmosphere sectional, the 2 dimension with successive accumulation are sectional obtain three-dimensional substance then. Common titanium alloy adds material to make a technology have electorate laser melt (SLM) , electorate electron beam is fused (EBM) etc. SING give the titanium Tantalum alloy that the graph shows 1 times through SLM technology preparation poriferous sample, the dimension precision that discovers poriferous structure, mechanical function is more sensitive to laser power; The MIRANDA ability that studied SLM technology machines thin wall spare parts, analysed the effect that machines parameter through mathematical model, go out for raw material preparation with Ti6Al4V small board, small post structure; LIU issue the Ti2448 that has good organization structure through EBM preparation poriferous sample, and this sample has taller intensity modulus to compare. Poriferous sample adds the titanium Tantalum alloy that technology of graph 1 SLM machines the hole of interior of spare parts existence that small production technology produces material, mechanical to its function has adverse effect. In addition, means of accumulation of layer of this technology to in an attempt to undertakes machining, surface roughness of surface of finished product spare parts owes beautiful, partial circumstance needs follow-up processing in order to satisfy real requirement. The talent such as 3 titanium alloy is small small production technology basically is the material such as alloy of production technology titanium technology of pulverous inject small figuration. This technology adds man-hour to mix powder and binder refine to become treatment raw material, figuration gives specific appearance, get the product of a need via the link such as defatted, agglomeration. The workpiece composition of this technology preparation waste material of even, later period is little, have batch productivity, if the graph is shown 2 times,its machine example partly. Graph the titanium alloy small part of preparation of small figuration of 2 pulverous inject because low oxygen of —— of this technology producer goods exceeds cost of pink of fine globose titanium taller, wait because of this MANSHADI studied low cost replaces dehydrogenation of hydride of raw material —— (HDH) the treatment feasibility of titanium pink, decided the critical process parameter of this raw material, final finished product is contractive and even, but prep above of the quantity that contain oxygen anticipates; HAYAT get together with water-solubility glycol (PEG) for bases, get together carbonic acid inferior inside ester (PPC) , get together methylic acrylic acid armour ester (PMMA) gave priority to catenary composition to develop the new-style binder system that applies to small figuration of inject of titanium alloy powder, new-style binder can raise figuration significantly green compact intensity, be helpful for follow-up treatment. Technology of small figuration of inject of titanium alloy powder has batch productivity, however the promotion that higher raw material cost restricted this technology, need develops low oxygen to exceed the preparation craft of fine globose powder further, or the processability that begins low cost to replace raw material can study. Additional, the binder of small figuration of inject of titanium alloy powder is the treatment craft that draws lessons from other powder normally, character cannot match completely with titanium alloy, the treatment effect with the new-style better with obtaining binder that needs further development to suit titanium alloy. 4 titanium alloy reduces ability small production technology 4.

The data of purify of minim cutting action that small processing technique of machinery of 1 mechanical small processing technique passes cutting tool, have treatment precision integrality of tall, surface good, treatment is flexible wait for an advantage by force with exterior composition stability. PRATAP small indentation and small reseau structure gave in Ti6Al4V surface preparation through technology of ball head small milling (partial small structure sees a picture 3) , studied the tribology performance of different structure; The coating of the cutting tool when studying titanium alloy small cutting such as ZIBEROV is affected to cutting tool tatty, the result makes clear, below condition of dry type cutting, the cutting tool when using data of Ti6Al4V of cutting of kind of diamond coating cutting tool, TiAlN coating cutting tool wears away can reduce respectively 640% , 267% . Graph the Ti6Al4V small structure that 3 small milling machine because the cutting processability of titanium alloy can be poorer, treatment process is easy occurrence cutting tool wears away, the phenomenon such as exterior burr, the photograph of mechanical small treatment because of this titanium alloy relatively at groovy metal character difficulty is greater. Although the near future erupts about the research paper of small treatment of titanium alloy machinery,type grows, but the case that its industrialization uses actually very exiguous. 4.

Small processing technique of 2 heat energy (1) small processing technique of laser of laser small processing technique removes workpiece material through corrode of laser of high energy density, as taller than precision as photograph of technology of groovy laser beam machining, hot influence area is smaller, suit the hot ablation processing with local workpiece especially. TEMMLER laser small treatment had to titanium alloy below condition of tall scanning speed, if the graph is shown 4 times,machine the effect; The WANG beehive shape structure that connects through stimulating smooth small processing technique to go out in Ti6Al4V surface preparation, via the optics of spare parts surface of processing reflectivity was reduced 90% . Graph small treatment process is in the laser of small structure of titanium alloy surface of 4 laser small treatment normally undertake in air, workpiece surface is easy produce oxidation metamorphism, and surface of alloy of the titanium below heat energy action produces unripe fire damage easily. The cost of generator of short pulse laser that this technology uses is higher, need is farther research and development is efficient, reliable and the generator of short pulse laser of low cost, in order to promote the industrialization application of this technology. (2) processing technique of electric spark of electric spark small processing technique chooses electrode of micron class tool, come through controlling the electric spark between tool electrode and workpiece purify material. Precision of this technology treatment is tall, and have treatment profound wide the ability that compares small structure. The TONG electric spark small treatment that offerred servo of double axis linkage, odd axis is new craft, through new technology successful treatment gives NiTi alloy small part (see a picture 5) ; Distributinging case of the FENG speed field that explored medium of space of the work below rotate speed of different tool electrode and child, the electrode that discovers high speed rotates conduces to cleared child and increase the stability that machines a process. Graph the small processing technique of electric spark of NiTi small part of small treatment of 5 electric spark is based on material of workpiece of fuel factor purify likewise, easy generation heats up blemish when treatment. Because its machine a process to discharge often, so electrode produces loss inevitably, reduce treatment precision. In addition, machining profound wide when comparing small structure, treatment child is easy adhere to in workpiece surface, put in adverse effect to machining stability. 4.

3 electroanalysis small processing technique electroanalysises small processing technique dissolves with electrochemistry the technology is a principle, through zincous metal oxidation dissolves purify workpiece material. This technology does not have electrode loss, treatment process does not have internal stress, surface roughness of finished product surface is good, and workpiece material with ionic form purify, academic precision can amount to accept rice class. Electroanalysis to study titanium alloy the possibility of small treatment, the ANASANE deliquescent character that tested alloy of the titanium below different electrolyte condition, discover glycol - the electrolyte of the bromic combination that change sodium shows exceedingly good treatment result; ANASANE considered to electroanalysis the influence of parameter of the craft in small treatment to machining precision, pass layer upon layer electroanalysis the quadrate helix small passageway that if the graph is shown 6 times,the kind of milling happens in preparation of pure titanium surface opens groovy structure; Using sodium chloride YU - the helix electrode that high speed introduced to rotate on the foundation of glycol electrolyte electroanalysises with quickening the purify of child, what the treatment on titanium board gave quality of high accuracy, fast face is small seam a structure. Graph 6 electroanalysis the character that the quadrate helix small passageway of preparation of small processing technique knows groovy titanium alloy to have easy passivation, its form passivation layer easily in Shui Jirong fluid, can bring about deliquescent process to be stabilized continuously hard undertake. In the meantime, electroanalysis the stray of blame treatment area in small treatment is corroded, the phenomenon such as treatment surface re-etching also can is opposite the treatment effect of finished product produces adverse effect. Although bound of science and technology electroanalysises to titanium alloy small treatment extremely have fun at and be full of expect, but this technology is in practical the way that quite long exploration still wants before changing. 4.

4 compound small processing technique have a lot of difficult fabricating characteristics as a result of titanium alloy, the treatment method of principle of single material purify is put in certain confine, accordingly, it is the treatment effect with be obtained better, often will two plant or the craft combination of different principle forms two kinds of above compound treatment. Wait for a problem to solve function of titanium alloy cutting to differ, XIA put forward laser craft of revulsive oxidation milling, control laser and oxygen are carried, surface of revulsive titanium alloy forms inattentive oxidation layer, material purify comes true through small milling after. This technology can acquire better treatment surface quality, and cutting tool wear rate is extremely low. Machine the problem such as child eduction difficulty in the light of electric spark, the development such as SINGH gives unit of small treatment of a kind of supersonic and auxiliary electric spark, discovery is supersonic and oscillatory wear rate of the material purify rate of small to electric spark treatment, cutting tool and aperture taper have distinct effect. The treatment stability that brings about to improve titanium alloy passivation falls low problem, WANG studied machinery electroanalysises the purify mechanism of the material in milling process, built mathematical model to add milling of the electrochemistry between time limit for a project and groovy milling in order to measure occupy than, compare with traditional electrochemical machining photograph, machinery electroanalysises milling treatment has taller treatment efficiency. The primary rational restriction of compound small processing technique is fewer, have higher development latent capacity. However its treatment process is relatively complex, the purify mechanism of the material below different energy combined action still is clear about not completely, because this titanium alloy is compound small processing technique is in notional development and archetypal development phase more at present, need studies further in order to realize efficient, high quality titanium alloy small treatment. The article summed up 5 last words a few kinds of important titanium alloy are small production method and technology, summed up the advantage of each craft and inadequacy. Because titanium alloy has a lot of difficult fabricating characteristics, the treatment means of principle of single material purify is put in certain confine, and compound small processing technique is in at present start level, remain to study further, accordingly, research key of future should focusing comes the following respect. 1) small to reducing ability production technology, need to deepen the understanding of pair of material purify mechanism, improvement machines the adverse element that appears in the process. In addition, need to propel the research of compound small processing technique further, make full use of to machine mechanism differently to realize treatment of titanium alloy high quality. 2) small to adding capable person production technology, the small processing technique that needs to explore small hole to lead further reachs technology of efficient aftertreatment of small structural member, advance titanium alloy to add capable person stage by stage the development of small production technology in industrial domain. 3) small to waiting for material production technology, need to begin the feasibility research of pink of low cost titanium, the high quality that the treatment craft of character of material of comfortable alloy matching titanium changes with realizing batch machines research and development. 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