In the past two years, jetting technology has entered people ’s attention at intervals, and all of them have launched corresponding technologies as star enterprises. Stratasys, XJET and HP have successively launched printers based on jetting technology. Problems-color, batch and high surface quality. However, when people exclaimed the revolution in technology itself, the high cost of printers and materials was prohibitive. Based on this, the development of injection technology itself is changing this status quo. Stratasys has announced the launch of a new 3D printing material for jetting technology, which reduces costs by 50%; HP has launched a new 4210 system, which improves the structure of the equipment to achieve mass production of parts and further improve efficiency. The above facts all indicate that the material injection technology is rapidly challenging the application of lasers in non-metal powders and metal powder materials, and has made breakthroughs in the field of metal printing, becoming the key technology for batch printing of metal parts. A lot of news shows that the position of material injection technology in the 3D printing industry is becoming more and more important, and it cannot be ignored more and more. The author therefore makes a separate issue of jet technology. At present, the material spray technology on the market is divided into two categories: spray printing materials and spray binder. The author of inkjet printing materials is called material injection molding technology, and the spray adhesive is collectively called binder injection molding technology (actually 3DP technology). There are very few direct injection molding materials. Only Stratasys and XJET are the core technologies Polyjet also has a great origin with XJET; in the 3DP technology category, the binder is divided into two kinds of special glue and resin binder, and the role is to form the powder material. In the past few years, 3DP has been used to make sand molds. With the increasing demand for large-size sand mold structures and the development of material technology, 3DP technology has gradually squeezed the laser printing market; and recently in metal printing, The three keywords of high speed, batch and low cost have earned enough popularity, making people realize that 3DP can not only be used to bond foundry sand and nylon powder, so it has received a lot of investment, and binder injection technology is becoming a field in metal printing. Nova. Material injection molding technology 1.Polyjet technology Technical features: direct injection resin molding material Technical principle: Polyjet technology uses resin spraying to provide materials, identify the color of the current layer and spray the resin at the location where it needs to be printed, and cure by light. The fully cured model can be used immediately without additional subsequent curing. Comments: The precision and strength are very high, it can realize the spraying of multiple materials at different positions, and the ordinary 3DP is hanged, but the price is also very expensive. It can be used to make injection molds, fixtures, fixtures, teaching and promotional exhibits, production parts, etc. 2. NPJ nanoparticle spray technology Technical characteristics: Direct injection of ink forming parts containing metal powder or ceramic particles Technical principle: the liquid wrapped with nano metal powder, ceramic powder or supporting particles is loaded into the printer and sprayed on the construction platform, the liquid is evaporated by high temperature to leave the metal part, and finally shaped by low temperature sintering. Comments: The expression of detail, surface finish and precision is extremely high, the key is the dispersion of nanoparticles in the ink; cleaning and post-processing will be simple; the cost of nanomaterials is high, I am afraid that I ca n’t afford the equipment. Lower cost is not credible. It is suitable for printing titanium alloy medical devices, such as knee implants, and can also produce aluminum alloy parts for the automotive and aerospace fields. Binder spray technology The biggest advantage of the binder jet technology is to break through the size limitation of laser manufacturing, so that the printing size of nylon and foundry sand molds reaches several meters, and metal printing achieves batch size and low cost, so it has become a new favorite of various venture capitalists. 1. Used for ceramic and foundry sand printing Technical characteristics: the parts are bonded by spraying adhesive to the cross-section of the powder layer parts. Technical principle: The print head is moved to spray glue on the cross section of the part (the diameter of the nozzle is usually 80μm). After the first layer is printed, the part is reduced by a layer thickness and the powder is sprayed again to spray the glue. The process is repeated until the part is completed. . Depending on the material, choose whether subsequent sintering is required. Comment: The sand printing will be widened several times, the speed will be improved, and the cost will be reduced. 2. Used for metal powder printing Technical characteristics: The printing process is similar to cold forming. Technical principle: Parts are formed by spraying adhesive layer by layer, and then the parts are completed by high temperature sintering. Comments: It can be printed in batches, at low cost and at high speeds, the parts need less support, and the material molding shrinks. to sum up Material injection technology is much more difficult than binder injection technology, especially XJET's nanoparticle injection technology. Material cost is still an important issue that limits the development of technology. Compared to Polyjet, which has been widely used, the commercialization of XJET has to wait and see. The application of binder jet technology in the field of metal printing, I believe that this greatly exceeds the limelight of XJET nanoparticle jet technology. Before bonding metal, XJET was considered to be the future star, but the speed of technological innovation is amazing. At the same time, binder injection is used for metal printing, which has many advantages over powder laser molding. The former often does not allow adding support. It can print more complex structures that SLM cannot print, and materials that SLM is difficult to mold. But one technology is difficult to completely replace another technology. Binder injection metal forming requires subsequent sintering, and involves material shrinkage. There are drawbacks in manufacturing high-precision small parts at one time, and it is not comparable to manufacturing large parts Lens is not as good as XJET in terms of surface finish. In short, each technology has its own advantages, it is difficult to have a unique situation. But no matter what, the jet technology is getting more and more attention. The breakthrough of the 3D printing technology itself makes it possible to change the manufacturing industry. Editor in charge: null
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