Metallic powder eject, the figuration technology of 21 centuries

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Belong to pulverous eject to shape technology (MetalPowderInjectionMolding, abbreviation MIM) is a when technology of figuration of will contemporary plastic eject introduces pulverous metallurgy domain and form new-style and pulverous metallurgy technology of figuration of close clean look. Its are basic process is: Mix solid powder and organic binder practice equably above all, heating via making bead hind model changes condition to fall (~150 ℃ ) with figuration of the solidify inside antrum of model of infuse of eject forming machine, next the method of chemically or pyrolysis takes off the binder in figuration base except, final classics agglomeration is compact change get end item. Compare with conventional technology photograph, have precision tall, organization even, performance is superior, manufacturing cost is low characteristic, its product applies extensively at the industry such as appliance of equipment of medical apparatus and instruments of electronic information project, biology, office, car, mechanical, hardware, sports, horological course of study, enginery and aerospace domain. Accordingly, a thinks the development of this technology will bring about component figuration and processing technique generally revolution on international, be known as " current the most popular component figuration technology " and " the figuration technology of 21 centuries " . Company of American California Parmatech was invented 1973, a lot of countries of the Europe at the beginning of 80 time and Japan also throw great energy to begin to research this technology, get be popularizinged quickly. Especially 80 time metaphase, since this technology realizes industrialization more the progress that achieves advance rapidly, increase by degrees every year with breathtaking speed. So far, the product development that more than 10 countries such as the United States, Western Europe, Japan and area have more than 100 companies to pursue this engineering technology, development and sale work. Japan is very active on competition, and expression is highlighted, a lot of large company limiteds all participate in the promotion of MIM industry, these companies include to Pacific Ocean metal, 3 water chestnut make steel, plain Qi make iron, Kobe make steel, live industry of friendly mine, energy- - Aipusheng, Great Harmony is special steel. At present Japan has more than 40 major to pursue the company of MIM industry, the sale total value of product of its MIM industry exceeds Europe already and chase after the United States continuously. So far, the product development that the whole world already had more than 100 companies to pursue this technology, development and sale work, MIM technology also makes the field of most active forward position technology in new-style manufacturing industry accordingly, by the pioneering technology of world metallurgy industry, representing progress of pulverous metallurgy technology advocate directional MIM technology. Metallic powder eject shapes the technology is collect plastic shape craft learns, technology of high polymer chemistry, pulverous metallurgy learns and metallic stuff learns to wait for much discipline to show the result with across, use a pattern but eject shapes the structural part that blank makes three-dimensional and high density, high accuracy, complex appearance quickly through agglomeration, can have melt into of design thought content well and truly the product of character of particular structure, function, and but direct batch production gives a part, it is to make technical trade change newly. This engineering technology has process of technology of groovy and pulverous metallurgy not only little, without cutting or little cutting, economic benefits advanced advantage, and overcame products of technology of traditional and pulverous metallurgy, material to pledge inhomogenous, mechanical function shapes lowly, not easily the defect of Bao Bi, complex structure, special agree with big batch production is small-sized, complex and the metallic spare parts that has special demand. → mixes technological process binder aftertreatment of → of agglomeration of defatted → of → of figuration of refine → eject. Place of craft of MIM of pulverous metal powder uses metallic powder particle size to be in commonly 0.

5~20 μ M; From theoretic tell, grain is finer, the area that compare a list is larger also, shape easily and agglomeration. And conventional pulverous metallurgy technology uses those who be more than 40 μ M thicker powder. Organic adhesive organic adhesive action is to stick receive metallic powder grain, make compound expects to heat in the canister in spraying machine have shed denaturation and lubricity, drive the carrier of pulverous flow that is to say. Accordingly, sticking the option that receives a dose is the carrier of whole powder. Accordingly, stick playing an option is the key that whole and pulverous eject shapes. Right organic stick the requirement that receive a dose: 1.

Dosage is little, with less stick those who receive an agent to be able to make compound generation better to shed denaturation; 2.

Do not react, stick in purify any chemical reaction do not have with metallic powder in the process that receives a dose; 3.

Easy purify, do not remain inside goods carbon. Batch mixing the metal powder and organic stick receive a dose even mix into lump, make all sorts of raw material become eject to shape with compound. The even degree of compound affects its fluidity directly, consequently influence eject shapes craft parameter, down to is final the density of material and other function. Eject figuration this pace process and plastic eject shape process is consistent on the principle, its equipment condition is basic also and same. Shape in eject in the process, compound is heated to have the plasticity stock that sheds denaturation inside canister of spraying machine makings, be in below proper spraying pressure in infuse mould, shape a semifinished product. Of the semifinished product that eject shapes microcosmic on should agree equably, make goods contracts equably in agglomeration process thereby. Extraction shapes semifinished product is before agglomeration what what must contain inside purify semifinished product is organic stick receive a dose, this process calls extraction. Extractive craft must assure to stick receive a dose the different position from semifinished product along the small passageway between makings gradually eduction, and the intensity that does not drop semifinished product. Of binder eliminate rate to abide by diffusion equation commonly. Agglomeration agglomeration can make systole of poriferous defatted semifinished product comes to be changed closely make the product that has certain organization and property. Although make a lot of craft elements before tubal function and agglomeration concern, but fall in a lot of circumstances, agglomeration craft is having very big, conclusive even effect to the metallographic organization of final product and function. The spare parts with relatively nice to dimension requirement aftertreatment, need undertakes necessary aftertreatment. The heat treatment process of this working procedure and groovy metal is same. Bead diameter is in the characteristic MIM craft of MIM craft and the raw material powder that other machines the comparative MIM of craft to use 2-15 μ M, and the diameter of bead of former pink powder of traditional and pulverous metallurgy is in mostly 50-100 μ M. The finished product density of MIM craft is high, the reason is to use imperceptible powder. MIM craft has the advantage of technology of traditional and pulverous metallurgy, and the freedom on appearance is spent tall place of traditional and pulverous metallurgy cannot be achieved. The intensity of mould of be confined to of traditional and pulverous metallurgy and fill density, appearance is 2 dimension round pillar mostly. Traditional nicety casts dry craft to make the technology with complex form extremely effective product for a kind, use Tao Xinfu to help the finished product that can finish slit, deep cavity in recent years, but the intensity of heart of hindering Yu Tao, and the limitation of the fluidity of casting fluid, this craft still has the difficulty on certain technology. Generally speaking, this craft makes big, medium-sized part relatively appropriate, the spare parts of small-sized and complex form criterion with MIM craft relatively appropriate. Compare tradition of craft of project workmanship MIM diameter of bead of powder of pulverous metallurgy technology (μ M)2-1550-100 is opposite density (%)95-9880-85 product weight (G) is less than or be equal to 400 grams 10- hundreds product figure is three-dimensional and complex appearance 2 dimension are simple MIM of bad of actor of appearance machinery function makes Cheng Hechuan. The product of this craft because the limitation of material, its intensity, wearability, be able to bear or endure corrode sex all has limit. The raw material that MIM craft can process is more. Accurate foundry technology, although be in,in recent years the precision of its product is mixed complex degree all rise, but still craft of dewax of be not a patch on and MIM craft, powder forgings is a significant progress, the quantity that already applied to connecting rod is produced go to. But generally speaking, the life of the cost of the heat treatment in forginging project and mould still has a problem, still wait for solve further. Traditional machining law, latter rely on automation and promote its process capability, there is huge progress on the effect and precision, but progressively treatment still is not taken off on basic course (turning, dig, mill, grind, bore, polish) the means that will complete spare parts form. The treatment precision far excel of machining method is other machine a method, but the effective utilization rate because of material is low, and of its appearance finish suffer equipment of be confined to and cutting tool, some spare partses to cannot be finished with machining. Contrary, MIM can use data effectively, unlimited, to small-sized, tall difficulty of the nice spare parts of appearance make, MIM craft compares machining and character, its cost is inferior and efficiency is tall, have very strong competition ability. MIM technology is not with conventional treatment the method competes, the inadequacy that makes up for a tradition to machine a method to go up in the technology however or the defect that make without legal system. The spare parts that MIM technology can machine a method to make in the tradition produces its specialty on the domain. The technical advantage that MIM craft has in place of component production field can shape height is complex structural part eject of the structure shapes engineering technology uses spraying machine eject to shape product semifinished product, make sure stock fills mould cavity adequately, also assured the implementation of miscellaneous structure of spare parts Gao Fu. It is before in traditional processing technique first specific element combines consummate again the means of package, conformity can consider to become complete onefold part when use MIM technology, reduce measure greatly, simplify machine program. MIM and the comparison that other metal machines a law product measure precision is tall, need not undertake fabricating or need a few finish machining eject to shape only craft can shape directly Bao Bi, complex structural member, product figure already was close to end item requirement, public errand of spare parts dimension maintains commonly in ± 0.

1- ± 0.

3 the left and right sides. Be hard to have the finished cost of the hard alloy of machining to reducing particularly, reduce precious metal place to machine a loss to have important sense especially. Goods is microcosmic organize even, density tall, performance is good as a result of,be in in suppress process the attrition force between modular wall and powder and powder and powder, make suppress pressure distributings very inhomogenous, also brought about suppress semifinished product to be in of microcosmic textural inhomogenous, can cause suppress powder metallurgy so contractive in agglomeration process inhomogenous, because this must drop firing temperature,plant in order to reduce this effect, make goods porosity big thereby, material is compact sexual difference, density is low, affect the mechanical performance of goods badly. Conversely eject shapes craft is a kind of fluid shapes craft, the even platoon cloth that stuck the existence that receives a dose to ensure powder can remove semifinished product thereby of microcosmic textural inhomogenous, make agglomeration goods density can achieve the theoretical density of its material then. The density of suppress product is usually highest 85% what can achieve theoretical density only. The compact sex with high products can make intensity increases, tenacity is strengthened, extend gender, electric thermal conductivity to get improvement, magnetism can rise. Efficiency is tall, realize large quantities of quantities and dimensions to change the metallic pattern that manufacturing MIM technology uses easily, its life and project are plastic eject shapes provide a mould to comparative. Because use metallic pattern, MIM agrees with of the spare parts mass-produced. Because use spraying machine to shape product semifinished product, improved manufacturing efficiency greatly, reduced manufacturing cost, and eject shapes the consistency of the product, repeatability is good, was large quantities of quantities and production of industry of dimensions chemical industry to offer thereby assure. Applicable material range is wide, applied domain is vast (iron radical, low alloy, high-speed steel, stainless steel, overcome alloy of a powerful person, hard alloy) the data that can be used at eject to shape is very extensive, in principle holds the post of He Ke high temperature to irrigate the pulverous material of the knot to all can cause a part by MIM craft, the difficult treatment material in including traditional workmanship and Gao Rong burn material. In addition, MIM also can undertake according to the requirement of the user material recipe studies, make the alloy material of aleatoric combination, shape composite material for the spare parts. Eject shapes the applied domain of goods already pervaded national economy each domain, have wide market perspective. Eject shapes the function of goods and craft of cost analysis MIM use micron class fine powder, can quicken agglomeration systole already, conduce to the mechanical performance that improves data, prolong the fatigue life of material, can improve again be able to bear or endure, fight stress to corrode the function that reach magnetism. The applied domain of MIM technology includes: 1.

The computer reachs its support features: Sell like axis of core of printer spare parts, magnetism, firing pin, drive spare parts 2.

Tool: Be like milling cutter of head of broach, knife, nozzle, gun getting, helix, drift, sleeve, spanner, electrical engineering tool, 3 hand tool.

Family expenses appliance: Block first class of knife of band, cutting tool like link of chain of head of watchcase, watch chain, electric toothbrush, scissors, fan, golf, jewelry, ball-pen component 4.

Medical treatment machinery uses a part: Like the tooth orthopaedic wearing, scissors, forceps 5.

Spare parts of for military use: Spare parts of missile empennage, firearms, warhead, medicine cover, fusee uses a part 6.

Electric equipment uses a part: The electron is enclosed, spare parts of miniature motor, electron, sensor 7.

Machinery uses a part: Machine of the cotton that be like a pine, spin machine, roll edge machine, office machine; 8.

Car shipping uses a part: Like clutch core, unplug fork is covered, alloter is covered, steam door conduit, synchronous hub, safe gasbag etc. CNC Milling