Porsche can now 3D-print hard-to-find parts for 959, 964, 365 models

Article by Christian A., on February 14, 2018

Owners of the highly coveted Porsche 959 or even the 911 Speedster don’t have to worry about finding replacement parts for their units. They may now drive their cars to their hearts’ content. And that is because of 3D printing technology. This device will allow automakers to put some rare replacement car parts into production - and that should be great news to everyone.

Some of the parts that could be made with 3D printing include the rearview mirror base for the 911 Speedster, fuel cap gasket and clutch release level for the 959, and for the 964 generation of the 911, a crank arm. Lastly, it can also produce the exhaust heat exchanger bracket for the B and C iterations of the 356.

The reason why Porsche Classic keeps a low number of these parts on hand is because of the fact that customers don’t typically need these parts replaced. And because of the low demand, this makes it perfect for the company to build them with 3D printers as they will be made to order instead. In fact, these computer printed pieces have the exact same technical specs as the original parts.

Let us get into more detail about this. Each part requires a different form of 3D printing. For instance, the 959 clutch release level uses a computer controlled additive process, with the use of less than 0.1 percent millimeter of steel powder at a time. This will then be solidified with the use of laser. As for the plastic components, it works with selective laser sintering that heats the raw ingredients to reach just under the melting point. The laser then fuses everything together.

Right now, 3D printed parts are being sold in the market. At the same time, Porsche is testing 20 more components to find out whether they work well.

3D printing may sound new to some people. But in fact, this has been used in the auto industry for quite some time now. Automakers like Bugatti have used this method to create a titanium brake caliper, which we talked about just a couple of weeks ago.

The brake caliper only weighs as little as six pounds six ounces (2.9 kilograms), compared to the existing aluminum part of the Chiron weighing 10 pounds 13 ounces (4.9 kilograms). The next step that it needs to accomplish to get past the development stage is to test the part on the road. If it succeeds, then it will likely go into production.

In the near future, most if not all automakers will probably begin doing the same process in building car parts, this will save them plenty of space because everything will only be produced when ordered.

Press Release

Innovation meets tradition: Rarely required parts created using modern manufacturing processes

"No longer available" – for collectors of rare classic cars, the unavailability of spare parts can quickly lead to problems. In the worst case scenario, the car may even be forced out of action. Porsche Classic, the division of Porsche dedicated to classic vehicles, has come up with a solution to this problem: namely, producing extremely rare parts that are only needed in small quantities using 3D printers. All parts that are produced using the 3D printing process meet the requirements in terms of absolute fidelity to the original specifications – both from a technical and a visual perspective.

The Porsche Classic range currently includes some 52,000 parts. If a certain spare part is no longer in stock or stock is dwindling, it is reproduced using the original tools. For larger quantities, production may require the use of new tools. However, ensuring the supply of spare parts that are only required in very limited numbers sometimes poses a major challenge, even for the experts. Producing small batches using new tools would be largely inefficient. Before embarking on a project to produce a particular component, Porsche Classic always evaluates various manufacturing processes.

As the quality of “additive” manufacturing processes continues to improve with generally decreasing costs, this form of manufacturing presents an economic alternative for the production of small quantities. Say, for example, the release lever for the clutch on the Porsche 959 is no longer available. This component made from grey cast iron is subject to very high quality requirements, but is in very low demand – not least because only 292 of these super sports cars were ever produced. The only manufacturing process worth considering would be selective laser melting. To manufacture the release lever, a layer of powdery tool steel less than 0.1 millimetres thick is applied to a processing plate in a computerised process. In an inert atmosphere, a high-energy light beam then melts the powder in the desired locations to create a steel layer. Thus, the complete three-dimensional component is produced, layer by layer. Both the pressure test with a load of almost three tonnes and the subsequent tomographic examination for internal faults were passed by the printed release lever with flying colours. The practical tests with the lever installed in a test vehicle and extensive driving tests confirm the impeccable quality and function of the component.

Due to the consistently positive results received to date, Porsche is currently manufacturing eight other parts using 3D printing. The parts in question are steel and alloy parts produced using the selective laser melting process, and plastic components manufactured using an SLS printer. SLS stands for selective laser sintering, a process where the material is heated to just below melting point and the remaining energy is applied through a laser to fuse the plastic powder at a selected point. All parts are subject to the quality requirements of the original production period as a minimum, though they usually meet higher standards. Accuracy in terms of size and fit is ensured by performing tests with the part installed. Depending on the area of application, plastic parts made of various materials as in the original must be resistant to oils, fuels, acids and light.

Porsche Classic is currently testing whether 3D printing is suitable for the production of a further 20 components. The benefits: Three-dimensional design data or a 3D scan of the component is a sufficient basis to commence production. The components can be produced on demand if needed, thereby eliminating tool and storage costs.

Source: Porsche

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