What are the advantages of metal 3D printing in customized assembly fixtures?

1. Getting around geometric limits: being able to design complicated structures without limits
The machining path of subtractive techniques limits traditional fixture design, making it hard to make complicated features like internal flow channels, biomimetic lattices, and thin-walled structures. For example, a certain company that makes car components tried to make a fixture for precision polishing that needed to have its uneven surface touch the surface of the eyeglass frame fully. But with standard CNC machining, tools can't get to all the places they need to, which leads to a machining mistake of more than 0.3mm on the fixture surface. This makes the polishing quality worse. Metal 3D printing can quickly make complicated shapes that traditional methods couldn't by melting metal powder layer by layer.
For example, SLM (Selective Laser Melting) technology can stack layers with a thickness of 0.05mm, which makes it possible to design topology optimisation structures like internal spiral flow channels and microporous arrays. A certain company that makes electronics uses 3D printing to make vacuum suction cups that are just right for them. The internal labyrinth flow channel design makes the gas spread out uniformly and increases the adsorption force by 40%. At the same time, the suction cup thickness is cut down from the usual 15mm to 8mm, which makes the robotic arm much less heavy. This freedom of design not only makes the fixture work better, but it also opens up the potential of making it lighter.
2. Shortening the delivery cycle: quickly going from design to finished product
Making fixtures the old-fashioned way takes five steps: "design programming processing assembly debugging." This procedure takes a few weeks. When a packaging machinery maker needs to switch out items on their production line, the old way takes 14 days to make new fixtures, which means that switching products is not very efficient. With the "one click printing" option, metal 3D printing turns design files into solid pieces right away, without any extra procedures like programming or getting tools ready.
In one occasion, a certain company that makes glasses used the Platinum BLT-S1500 to print polishing fixtures. It took only three days to go from importing CAD models to delivering final items. This was 78% faster than usual methods. More crucially, 3D printing makes it possible to quickly optimise "design print test iteration" in a closed loop. While making titanium alloy fixtures, a certain aviation parts maker employed Fusion 360 software to improve the topology. In just three days, they went through three rounds of design changes, which cut the weight of the fixtures by 35% while still making them safe to use in 10G vibration conditions.
3. Making better use of materials: going from "reducing material waste" to "near nett forming"
When making complicated fixtures, a lot of expensive metal materials are chopped off as waste, so the utilisation rate of typical CNC machining materials is usually less than 45%. For example, the market price of IN718 nickel-based alloy is as high as 800 yuan per kilogramme, and the cost of the material alone for making a 10-kilogram fixture using traditional methods is more than 40,000 yuan. And "near nett forming" technology is used in metal 3D printing, which means that more than 85% of the material is used.
For the restoration of a new energy vehicle battery module production line, they used aluminium alloy cooling plate fixtures that were made to order utilising 3D printing technology. By improving the design of the support structure, the amount of material used went from 12 kg in traditional methods to 3.2 kg, and the cost of individual pieces of material went down by 73%. More importantly, 3D printing allows for the integrated fabrication of different materials. For example, it is possible to directly print copper alloy heat dissipation modules on steel fixture substrates. This makes the structure stronger and better at managing heat. It's hard to make this composite material with typical methods.
4. Adaptability of the process: from "single function" to "multi scene integration"
Assembly fixtures need to be able to work in a variety of processing situations. Metal 3D printing can make custom fixture solutions that work in specific settings by combining different materials and processes in different ways.
Adaptation to high temperatures: The engine blade fixture made of IN718 nickel-based alloy can keep its shape at a high temperature of 650 °C, which is what the testing criteria for hot end components of aircraft engines are.
Corrosion-resistant scenario: Chemical equipment fixtures made with 316L stainless steel have three times better resistance to chloride corrosion thanks to an improved grain structure. Their service life is now 2.5 times longer than that of typical methods.
Requirements for precise positioning: A company that makes semiconductor equipment has started using micro laser 3D printing technology to make wafer transfer fixtures that are accurate to within ± 2 μ m. The roughness of the surface, Ra, is less than or equal to 0.8 μm, which is good enough for usage in ultra-clean workshops.
Also, fixtures for 3D printing can also have sensor functionalities. One robot maker added 3D-printed strain gauge installation slots to the fixture and kept an eye on how the clamping force changed in real time. This raised the assembly yield from 92% to 99.5%.
5. Industrial Practice: The Jump from the Lab to Big-Scale Production
The metal 3D printing fixture has moved from the idea verification stage to being used on a big scale. Safran Group has produced a 3D-printed oil cooler attachment for LEAP engines in the aerospace business. This design mimics nature and enhances the heat exchange surface by 40% while lowering the weight by 30%. It has also been able to make 2000 pieces a year on a huge scale using EBM technology. Apple has used 3D printing technology to make unique titanium alloy phone frame inspection fixtures in the consumer electronics market. This has cut the inspection cycle from 8 hours per batch to 2 hours per batch, which helps the iPhone series goods change quickly.
The combination of metal 3D printing and digital twin technology is making fixture manufacture smarter, which is even more interesting. By putting RFID chips in 3D printed fittings, a German fixture maker has been able to gather and analyse data in real time. When used with machine learning algorithms, it can guess how long a fixture will last and send out maintenance reminders automatically, cutting down on equipment downtime by 60%.