Analyse of explore of fast patternmaking technology

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The manufacturing industry with intense with each passing day competition is produced to shortening cycle and reduced cost to raise new requirement. Fast mould makes a technology get used to demand of this kind of market namely, a kind of when make tool and pattern conveniently can quick, new-style technology. The article elaborated this technology to develop circumstance and partial case namely. As the farther unifinication of global economy, manufacturing industry competition appears even more intense. How to shorten produce cycle and reduce cost, became manufacturing industry the problem of first consideration. Those who increase the development speed of the product and production is flexible change degree to become collective target. Fast mould makes a technology (RT) get used to demand of this kind of market namely, a kind of when make tool and pattern conveniently can quick, new-style technology. It is fast patternmaking technology of the foundation with fast figuration technology, it is 20 centuries the burgeoning technology that development of 80 time later period rises, the patternmaking method that is a tradition and the result that photograph of fast figuration technology combines. Compare with traditional technique photograph, fast patternmaking technology designs prototype from the development of the product of the model make, showed clinking advantage till the production of the production of product mould, product. Make the CAD picture later from archaic handiwork, arrive again present RT, its development also formed a comprehensive production system. Fast patternmaking technology fits Chinese national condition, have wide applied perspective. Machine photograph comparing with high speed milling, in exterior belt careful and complex form and electric spark are machined hard the metallic mould of leave out makes a respect have an advantage. The precision of the material according to prototype of cost of mould material, production, RP, production lot, mould asks to already developed varied technique. Current fast patternmaking method has indirect patternmaking law and direct patternmaking way roughly, the method that is based on RP to create a pattern quickly is indirect patternmaking law more. Basis material differs character, indirect patternmaking law produces manufacturing mould to have soft model, bridge model and die. Soft model (Soft Tooling) what point to normally is silicon balata mould. What make with the technology such as SLA, FDM, LOM or SLS is archetypal, after breaking up into silicon balata mould again, to the polyurethane of share of double group of the perfusion in the model, solidify hind gets wants part namely. Bridge model (Bridge Tooling) what point to normally is the epoxy resin pattern that can have noting model manufacturing directly. Use epoxy resin mould and photograph of traditional Injection Mold Tooling to compare, cost has a few of traditional method only, manufacturing cycle also decreases greatly. Mould life not as good as steel model, but taller than silica gel model, can amount to 1000 ～ 5000, the need that the small lot in can be being satisfied produces. Die (Hard Tooling) what point to normally is steel qualitative mould, be provided with indirect way production metal pattern namely and machine metallic mould directly with quick crash look. Fast and archetypal technology (RP) fast and archetypal technology (Rapid Prototyping, abbreviation RP) was born at the United States 1988, expand quickly Europe and Japan, introduce China at 90 time initial stage. Fast and archetypal technology (RP) it is to use data cumulative thought, make the new-style and integrated technology of product prototype quickly, apply extensively already at aviation of mechanical, car, electric equipment, spaceflight, war industry to wait almost all industrial domains, initiated the new era that the mould produces quickly, development perspective is wide. Conventional cutting treatment is ceaselessly the redundant material on purify semifinished product and get making, and RP technology is to use be based on material to accumulate production mind, three-dimensional and stereo those who regard countless parallel as, the overlay of the level that has different figure, can make quickly produce brilliant is archetypal. Fast prototype makes a technology (RP) the CAD (CAD) , auxiliary make (CAM) , the computer assists control (CHC) , the advanced technique collect such as accurate servo drive and new material at an organic whole, the product that makes on basis computer is three-dimensional design a model, undertake to its statified section, get each sectional outline, the cut with alternative laser one layer upon layer paper (or solidify one layer upon layer pulverous material or hot shower nozzle choose one layer upon layer liquid state colophony, agglomeration apace frit Fu one layer upon layer plastic or optionally to pulverous material eject one layer upon layer binder) , form each sectional outline folds addition stage by stage three-dimensional product. Current, it already made the pillar technology of modern manufacturing industry, it is to realize collateral project, compositive production technology and technology to develop one of indispensable methods. Have with the material that makes at fast prototype: Colophony of liquid state photosensitive, pulverous material, thermoplastic material and chip material. Fast prototype is made those who press figuration material and technology is different, developed way of stereo photoetching modelling (SL) , pulverous agglomeration law (SIS) , fused condense law (FDM) , layer material makes a way (LOM) , three-dimensional presswork law (3DP) , law of the solidify that chase a layer (SGC) . With traditional cutting treatment method photograph is compared, fast and archetypal treatment has the following advantage: (1) the part that can make a free curved surface and more complex form quickly, shoulder of the groove in be like a spare parts, protruding and hollow part, reduced the development cost of new product and development cycle greatly; (2) belong to blame contact treatment, do not need machine tool cutting to machine an indispensible cutting tool and clamping apparatus, wear away to be affected with cutting force without cutting tool; (3) without oscillatory, noise and cutting flotsam; (4) can realize nightly and complete automation to produce; (5) treatment efficiency is tall, can make product substance model and pattern quickly. The part that is based on RP technology is fast the mould makes example one, the technology of mould of vacuum of silica gel patternmaking of light carapace is fast prototype / the newer technology in domain of fast patternmaking technology, commonly used make at soft qualitative mould. The process that vacuum mould technology will come to make model of light carapace silica gel is used with respect to the introduction below. 1.

Test equipment place includes balance of electron of machine of MK-Mini vacuum casting, solar energy, Jing Yin with equipment tool of pneumatics machine, drawing of patterns and bad news material. The mould material that make uses silica gel T2 and stiffening agent (press 10:1 commonlyscale is made up) . 2.

The making process of silica gel model (1) the light that archetypal finishing makes with method of common fast and archetypal figuration is archetypal, its fold a layer aperture or uneven step grain often exist commonly between section, normally need undertakes the processing that prevent ooze, aggrandizement processing fight wet sex, heatproof sex and dimension stability archetypally in order to rise. In the meantime, want to undertake cleanness be spent in order to raise smooth Cheng of the surface to archetypal surface. Archetypal surface is enough and only slick, what just can assure pitch of assuring silica gel model is bright and clean degree, ensure then turn over the product that make to have faster face quality and facilitate take out from inside silica gel model. (2) silica gel and solidify agent are metric, mix and vacuumize above all the basis is archetypal (light carapace) dimension and appearance estimation are archetypal bulk, again plan the bulk of cipher out box, both photograph reduces the volume that must need silica gel namely. The weight of the weight that calculates silica gel according to the densimeter of silica gel and stiffening agent (both scale is 10:1 about) , mix next and put the vacuumize in machine of MK-Mini vacuum casting, this basically is the air of the interfuse when agitate of eliminate sizing material and partial reaction child. The prototype that what need an attention in this process is basis estimation when bulk will say to take silica gel, want right amount, model case volume has been obtained small, can reduce the dosage of silica gel, save patternmaking cost, but the use result that can affect silica gel and those who go against silica gel model is pouring, make made pattern is put in blemish thereby; Bulk has been obtained big, waste silica gel to increased cost to also increase to take out the difficulty of the product from inside silica gel model already. (3) choose the detached face, paper that stick gum to make runner use vacuum pouring no matter technical in principle is much complex part, include sunken part of protruding, side, can figuration. Crucial question is the position that should determine detached extent accurately, because it is being affected directly pouring product whether successful drawing of patterns and product are pouring the stand or fall of quality. Pouring buccal fixed position should make colophony arrives model box the method accident of each brims is identical, such is helpful for pouring, omit likely even irrigate rising head. Pouring the secures a best consumed to slip round lever of buccal channel position, use silica gel is normally marvellous. Choose next surfaces to be detached face to this light carapace, affix glue paper on detached face, make runner with silica gel club next. Runner position can choose end panel place only, cannot choose fluctuation surface, because such surfaces that can affect light are bright and clean,be spent and optical function, affect quality thereby. (4) silica gel is pouring again vacuumize solidify and the silica gel that stoving crosses exhaust is entered carefully from flank model box, silica gel is entered along the box wall of a side model box, till prototype inside all mergence silica gel. Model box is put into MK-Mini system, undertake vacuumize again, the purpose basically is to shuck off in pouring when because of adsorptive or get the remnant that block a face up the bleb in sizing material. These bleb have huge effect to mould quality, take off the limitation such as air hole produces in mould surface except not complete meeting. The time that has to this exhaust about 50 minutes, take out silica gel the drying in putting oven from vacuum room, undertake acceleration sclerosis to silica gel. (5) drawing of patterns is after silica gel is sclerotic, the mould can be opened. Pass before open pouring the mouth is connected compress air, make mould and prototype apart, facilitate next drawing of patterns. Draw the cent secant of wave line in detached face with the pen above all, reoccupy penknife presses standard of silica gel of wave line incision. As a result of the transparency of silica gel, the process of penknife cut is OK very see clearly. Should notice the penknife is in here as far as possible to detached face, what dissection in case is sectional leave with detached face too far. To prevent pouring when the amlposition of the mould, when cut mould, cut should be cut dentate. Use tool of drawing of patterns next will archetypal after be being taken out, the adhesive plaster that remains on silica gel and take out of silica gel bits, thereby the silica gel mould of light is made. Use this mould to be able to make a lot of lubricious appearance but the light carapace product with same figure. 3.

Of the product make a two half silica gel that has made film provides a lid to go up and be secured with hammer needle. First vacuumize puts vacuum again next pouring in machine, make pouring mouth of buccal alignment funnel, put product stuff into Mini pouring in the cup of machine, starting machine. Pass runner pouring, the mould is taken out to undertake stoving after be over, after waiting for solidify, reassume gives a mould to fly a model, such products were made come out. The product can choose different color according to need. From inside the experiment knowable, no matter the product that introduces technology of this kind of fast patternmaking to make is to be in quality, style, still be exterior precision, with prototype the photograph is more lubricious than ruding, can satisfy the requirement of fast production completely. 2, large car enclothes the large car mould of the fast making tradition of a mould to produce a method is obtain through casting above all model base, the method that adopts machine treatment next is right model the measure that base has machining will assure a mould. Traditional pattern machines the defect that the method exists to be: Production cycle is long, cost is high, the cycle that drops mould development and cost are become treat settlement problem urgently. Fast mould is made (RT craft) it is a kind of new-style craft, RT one of technique are to pass fast prototype to make (RP craft) obtain prototype, through having roast pottery and porcelain technology will archetypal changeover is pottery and porcelain model, cast into travel nicety again obtain dimension precision taller, surface is bright and clean degree of good cast, via creates pattern getting namely after polishing is handled. Tsinghua university laser shapes quickly center and collaboration of limited company of technology of mould of one steam group, one steam use RP/RT technology to make large car enclothe a mould, the move that make is as follows: (1) make CAD model with Pro/E modelling software. Applied MARC is nonlinear finite the dimension precision of the caky process to cast undertakes yuan of analysis software finite yuan of analysis, modification CAD model. (2) the prototype of section of job of punch-die of LOM craft production mould, in M-RPMS of Yan Hua company, on II equipment, applied LOM is statified and hypostatic workmanship, use YHCP-1004 coating paper, the prototype of punch-die of the mould that finish is made, others is made by sand mold. (3) the prototype of punch-die job section uses M-RPMS- Ⅱ model muti_function fast forming machine is made, outline scanning speed is 300mm/s, reseau straight linear velocity is 500mm/s, power of carbon dioxide laser is 35W, use paper of YHCP-1004 besmear Fu, hot pressing temperature is 90 ℃ , the total ply of paper and sub is 0.

1mm-1mm. (4) use changeover of prototype of the protruding that changes technical general pattern without roast pottery and porcelain, sunken model to be pottery and porcelain model, pottery and porcelain caky time is 8-10 minute, ra0 of exterior surface roughness.

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2. (5) use pottery and porcelain nicety to cast with disappear the method that the model casts technical photograph to be united in wedlock makes protruding, sunken model (include working section and other share) . (6) simple to casting gotten mould to undertake polish, burnish, obtain needs mould. Beijing Yan Hua laser shapes the punch-die that reachs pattern limited company to used RP/RT technology to finish large car to enclothe a mould is made, this is an experiment uses pattern of board makings punch, its successful open up large the new way that enclothes a mould to make. Trend of development of fast patternmaking technology is fast patternmaking technology is the generation in the competition in the machining patternmaking technology with the tradition intercurrent exhibit rise. Although in recent years technology of high speed milling gets developing quickly, its are as high as 10 to turn more / the competition ability that the milling rate of cent and good exterior precision already enhanced machining patternmaking technology greatly, plus electric spark processing technique, cause machining patternmaking technology to become the competitor with fast patternmaking formidable technology. But, imperceptible appearance, flow path is taken in production surface complex, and the respect such as the pattern that has qualitative face of gradient function material and different capable person, fast patternmaking technology also has a machine to machine unparalleled dominant position. Current, chinese car, home appliance, electron / communication, light industrial the development that waits for new product of a lot of industry more and more cannot leave fast patternmaking technology. To the development that this technology is in China, our long-term goal is the new material that develops the fast patternmaking place that has the short technological process that starts a gender formerly, high accuracy to need and new technology, have the technology of fast patternmaking core of Chinese own intellectual property in order to form. And urgent affairs is to increase the reachs low cost to make new technology and new material quickly development that has to metal pattern of large and medium-sized, complex form, wear, high accuracy strength. CNC Milling CNC Machining