Multiplying Options. Keith Schneider is a big advocate for additive
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1 By Christina Fuges Multiplying Options Additive manufacturing s greatest impact for this company is the versatility that has allowed it to offer different solutions than other manufacturers. Keith Schneider is a big advocate for additive manufacturing, but he doesn t expect it to ever completely replace machining in his company s tool-building process just enhance it. Additive manufacturing is just another process that we have in-house, says the general manager of Harbec Inc., a New York-based manufacturer of precision plastic and metal products. Since the 90s, the company has embraced AM as another tool in its toolbox, not some new, up-and-coming technology. It has helped to expand Harbec s capabilities, offerings and business opportunities when it comes to providing quality, tight-tolerance prototypes, tooling, machined components and injectionmolded parts quickly and sustainably. The company prides itself on helping customers solve complex engineering challenges in product design, development, prototyping or production by providing comprehensive manufacturing services for any stage, and Schneider says AM is key to achieving that goal. The company has almost always had at least one employee dedicated to working with AM. Fifty percent of that person s time is R&D, trying to develop the capability and learning where the company should use it. We have had a whole lot of failures, but a lot of successes as well, Schneider says. Today, Jeff Carson is Harbec s full-time additive guy. The mechanical engineer is in charge of developing the company s current This additively manufactured mold core and cavity with conformal cooling was used to produce an interactive model toy. Indicator marks on the vertical walls would have been impossible to produce using conventional machining methods. The cavity set was built on an EOS M270 using a nickel bronze material. 12 AM Supplement
2 additive technology as well as researching new technology and looking ahead to the future. The company frst invested in AM in 1996, purchasing a DTM 2500 Plus selective laser sintering (SLS) machine from DTM Systems to make both plastic and metal prototypes. Today, Harbec continues to use AM mostly for prototyping and production mold work, also employing an EOS M270 direct metal laser sintering (DMLS) system and a newly installed Concept Laser M2 LaserCusing machine. These additive technologies allow Harbec to create geometries that it cannot create with conventional subtractive methods. In the case of mold building, they can be used to create small, internal conformal cooling channels. In part manufacturing, they can create highly detailed, cost-effective This polished bulb was additively built with 17-4 stainless steel. With AM, there was no additional cost to add the logo, but it would have been expensive to add if the bulb had been CNC machined. Here, a DMLS machine is in-operation scanning a build layer using a 200-watt fber laser. parts that would be expensive and time-consuming if built using conventional CNC methods. Harbec s sweet spot is complexity. While using additive to make simple parts is cost-prohibitive, the technology tends to offer an advantage for producing complex parts in lower volumes. Complex parts and tooling are expensive, but AM helps us look at that differently, Schneider says. It makes complexity not such a big hurdle, and it also doesn t have such a cost attributed to it. It s more about total part volume than complexity. To determine if AM is the way to go for a particular job, Schneider recommends a shop review the following three factors: 1. Part complexity. If the part can be easily machined or turned, it is probably not a good candidate for additive manufacturing. 2. Material. While there are a number of AM material options, they are still somewhat limited, and there are some materials that cannot be manufactured additively. 3. Tolerance. Additive machines are accurate, but still not as accurate as CNC machining. AM has been essential to Harbec s ability to manufacture complex items, sustain growth, and improve results and pricing for customers. However, the company also has a huge machine shop, so if a customer requires high accuracy on certain portions of a part, it can provide that as a service as well. We do secondary machining on many additive parts, Schneider says. We will take the additive part, grow the majority AdditiveManufacturingInsight.com November
3 FEATURE of it, then load it on a CNC machine to mill any tightly-toleranced features. It s all about offering customers options. Analyze and Evaluate From the initial quote, Harbec views AM as an option for every project. However, because the company knows that AM doesn t work for everything, a customer-driven, collaborative evaluation process identifes the best manufacturing option for each individual project. Additive is not for everything, and I think some people get lost in that, Schneider continues. AM wins from a timeline standpoint, but from a cost standpoint it doesn t work all the time. That s where we start to analyze things. Harbec has four project managers tasked with evaluating new jobs. When a new project comes in, the project manager determines which process is best and works with the customers on ways to save money and reduce lead times. Customer requirements typically dictate the manufacturing process. A customer may have a product that could be done at less cost additively, but they want the machined surface fnish. Others may want more of an EDM fnish, leading us to AM, Schneider says. For example, Harbec molds bulk assemblies Harbec uses SLS technology to create intricate prototypes and production parts. A DTM 2500 Plus machine is shown here during build setup for prototype nylon parts. for a customer that builds interactive model toys. The mold cavity uses conformal cooling, and the company determined that etching on the side of the mold cavity could not be done with traditional CNC machining. We discussed 3D printing with the customer and decided that growing the mold cavity was the best option, Schneider says. We had the tool running in a couple of days, and it is still running today. From ABS to Steel Harbec also offers added value to customers by having both plastic and metal additive manufacturing capabilities in-house, which are incorporated into all facets of its prototyping and mold building. I like to tell people that when you come here, there is full accountability. When you bring a project to Harbec, there is only one place to point, Schneider says. We got into plastic additive manufacturing about 14 years ago, so we were on the front end of it. This segment of the technology is pretty busy now, so it is not quite as big a part of our business as it used to be. The majority of Harbec s AM business is prototype parts short runs of three to fve parts up to 20 to 30 parts. The company can reduce the cost of complex parts that would require a lot of machining setups by building them additively. But it is in mold building that Harbec sees future growth for its AM services because of the savings it can pass on to customers by producing cores and cavities in this way. In addition, the company is exploring producing plastic molds for short-turn prototyping for customers looking to validate design and mechanical integrity. 14 AM Supplement
4 This part, created on a DTM 2500 Plus, is a fully functional glass-flled nylon polyamide intake used by Rensselaer Polytechnic Institute on its formula SAE car. We use AM to make complete cavities everything except the frame of the tool. Basically, the business end of the tool, the part of the mold that interfaces with the molded part and resin, Schneider says. Harbec also uses AM to produce productionready cavities or molds. We are talking about production tools here, and that is where the cycle-time reduction beneft of conformal cooling comes into play, Schneider says. If you reduce cycle time and you are only going to mold a couple hundred parts, it is not that big of a beneft. However, if you are molding a couple hundred thousand or a couple million parts, the time differential makes a signifcant impact. The company s mission is to provide a wide variety of options to meet its customers needs, whether it is for a plastic mold, aluminum mold or steel mold, which usually is determined mainly by part quantity requirements. One option Harbec offers is direct metal molding using Xyloy metal alloy, a novel technology for injection molding that it uses to produce metal parts more effciently and cost-effectively than through traditional die-casting or CNC machining. This licensed process creates a part similar to die casting, but without all the drawbacks that go along with casting, according to Schneider. Basically, it is an injection molding machine with a barrel retroftted with proprietary heaters and controllers, he explains. It molds aluminum and zinc just as you would a thermoplastic resin. It squirts the molten material out of the barrel, cools it in the mold, and it comes out a fnished part. There is no secondary infltration process as you would see with the traditional metal injection molding (MIM) process. The resulting parts can hold tolerances of ±0.001 inch without fashing and therefore do not require secondary machining in most cases. There are not a lot of people doing this because it is not easy, Schneider says. We have been working with the process for about three years. Again, we wanted to offer more options. Currently, the market for it is pretty small, but it s growing. The metal molds Harbec uses for this process are additively grown from a maraging steel material that has outperformed H13 in durability. The molds include cavities and inserts with conformal cooling channels. The Concept Laser M2 the company recently purchased is used to build mold inserts for conformal cooling. Schneider says this machine is proving to be effective for fne detail and can also run aluminum, which is a primary focus for Harbec right now. We are looking at additively growing aluminum molds with conformal cooling, he says. Aluminum s thermal conductivity is already so much greater than steel imagine adding conformal cooling to that! We also plan to run titanium and a variety of steels. AdditiveManufacturingInsight.com November
5 Harbec uses DMLS to create prototype, production and mold components. Here, an EOS M270 machine completes a build layout for production steel components. Business Benefts AM also nicely compliments Harbec s initiatives related to sustainability, real-time collaboration and quick manufacturing solutions. Sustainability and additive go hand in hand, as there is very little waste involved. The additive process only uses the amount of material necessary to create the part, and the unused powder is recycled. Conventional subtractive methods begin with a large block of material and gradually remove that material until only the part is left. The removed material is discarded in landflls, or melted down and recycled using a large amount of energy. AM, therefore, reduces material consumption and overall energy consumption. In some cases Harbec also has been able to save electricity by using AM instead of EDM. AM helps support Harbec s real-time collaboration efforts as well. Project teams collaborate to review, inspect and even modify solid 3D models in real time, and AM prototypes are a part of this review process. Following a kick-off meeting, the 3D printing group prints a model of the part to be manufactured. This becomes a useful reference tool throughout the build to identify areas of concern while also eliminating any communication barriers. AM also fts nicely into Harbec s quick manufacturing solutions (QMS), in which creating prototypes and prototype tools quickly is essential. According to Schneider, the company typically can turn around metal or plastic prototype parts in three to fve days with AM, but such a fast turnaround is diffcult to achieve with a CNC machine. Plus, with machining, it takes time to get the material in-house and to program, set up and machine the part. With AM, Harbec stocks a number of materials and sometimes can get the part laid out and running in the machine within 30 minutes. Schneider says AM has also allowed Harbec to take on work that others won t. We had a customer who wanted a large, thick-walled part made out of nylon, which is a rather high-shrink material, and they wanted to maintain accuracy so they could have O-rings that would seal. The part was 3/8- inch thick with off-the-charts shrink. We looked at it a variety ways and ended up molding the part with conformal cooling, which allowed us to reduce cycle times signifcantly. In this case, AM provided a solution for molding an accurate part and reducing cycle time to an acceptable level for the customer. If the part had been made through traditional methods, the cycle time would have been much longer, and we are confdent that we would not have been able to make it within tolerance, he says. Running in Parallel Where does Harbec see AM taking the company? Our intent is to have 10 machines running molds for all of our processes, and we are working toward that today, Schnieber says. This does not mean the company plans to reduce its machining capacity, however. Harbec s large machine shop has played an immense role in easing employee fears of AM removing machining from the toolbuilding process. Instead, the company believes AM will work parallel to conventional machining, helping to build better tools, more quickly. 16 AM Supplement
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