Category: Aerospace

Planetary Resources Uses 3D Printed Casting Patterns to Explore New Frontiers in Spacecraft Manufacturing

Small Spacecraft, Big Mission

When a company sets out to do something as audacious as revolutionizing space exploration, it’s likely to throw away the book on many traditional processes, starting with design and manufacturing. Planetary Resources is not just at the forefront of space, but at the apex of manufacturing itself. The company is using 3D Systems technologies to optimize complex parts and assemblies—resulting in lighter-weight parts, quicker design iterations, and cost savings from consolidating assemblies into one casted part.

Planetary Resource’s stated mission is bold: “To establish a new paradigm for resource utilization that will bring the solar system within humanity’s economic sphere of influence.”

The company’s vehicle for low-cost robotic space exploration is the Arkyd Series of spacecraft that will identify near-Earth asteroids for mining of water and precious metals. The first demonstrator craft, the A3R, was launched and placed successfully into orbit in 2015. The second demonstrator, the A6, is scheduled for a Spring 2016 launch. The two demonstrator spacecraft, about the size of a cereal box, are being used to validate core technologies, including avionics, control systems, software and sensors for detecting and characterizing asteroid resources. They are setting the stage for Planetary Resources’ first full-scale production crafts, the Arkyd 100, 200 and 300 Series.The Arkyd 100, 200 and 300 are about twice the size of the demonstrator aircraft, with a mass of 11 to 15 kilograms (24-33 pounds). They are small enough to hitch a ride into space with larger, primary payloads, then be sent into orbit from a space station when conditions permit.

No Wasted Space

Planetary Resources expects that the Arkyd spacecraft will eventually be mass-produced, so there is no room for anything that is too heavy or takes up too much space within the spacecraft’s architecture. That’s where 3D Systems comes into the picture.

“3D printing helps us integrate separate pieces into one organic part,” says Chris Lewicki, Planetary Resources’ president, and CEO. “The goal is to have a spacecraft like your cell phone, with no wasted space.” A key area of concentration is the fuel tank, which in the past has taken up a large percentage of a spacecraft’s volume and often looks like an appendage tacked onto the outside of the body. In contrast, the Planetary Resources design for the Arkyd 200 and 300 uses patented QuickCast™ casting patterns from 3D Systems to make the propulsion system a structurally integrated framework for the spacecraft itself. Other parts such as the manifold, plenum, and routing geometries are also integrated directly into structural elements that support the spacecraft.

Modernizing a Time-Proven Technique

QuickCast, a methodology that modernizes traditional casting techniques dating back thousands of years, is the perfect solution for dealing with design complexity.

With 3D Systems’ process, a 3D pattern is built with a Stereolithography (SLA) machine. When the build is completed, liquid is drained from the pattern. The pattern is then coated in a casting ceramic shell. Once the shell has hardened, it is fired in high heat to burn out the pattern. Metal is poured into the resulting cavity. After cooling, the outer shell is broken to reveal the finished part.

    Major benefits of the QuickCast process include:

  • Ability to design complex parts for greater functionality.
  • Massive time savings from being able to go from CAD to pattern in a single day.
  • Faster design iterations by eliminating time-consuming tooling.
  • Reduced part count from consolidating components.
  • Access to any type of alloy, including conventional flight-certified metals.

“QuickCast affords a capability not possible with traditional manufacturing, and we’re also excited about the promise of direct metal printing,” says Chris Voorhees, chief engineer for Planetary Resources. “With new 3D Systems products like the ProX® DMP 320 system, we can create even more fine detail and precision in our titanium parts, and we look forward to deploying these into space on our upcoming spacecraft.”

Speed and Complexity at Low Cost

Using 3D printed patterns to cast metals gives designers the freedom to attain a higher level of design sophistication, creating organic shapes that remove fasteners, clamps, screws and other auxiliary parts required by traditionally manufactured parts and assemblies.

“Propulsion tanks are normally a large fraction of the volume of a spacecraft,” says Lewicki. “3D printing allows us to explore more efficient, organic designs using materials like titanium for an optimal structure in which to hold propellant. The result is a spacecraft that is at once lighter, cheaper, safer and much easier to reproduce in large numbers.” A life-size model created by 3D Systems and Planetary Resources shows the extent to which 3D printing informs the Arkyd 200 and 300 designs. The elegant model looks deceptively simplistic. The doughnut-shaped titanium fuel tank, created with cast patterns from a 3D Systems SLA printer, serves as the outer framework for the entire spacecraft. Fixtures, cable routing, and other elements are embedded in the design, reducing part count and adding strength and stability. The hole in the center of the doughnut holds the thermal laser sensor and communications components.

The first fuel tank designs using 3D printed patterns will debut on the Arkyd 100, slated for launch in late 2016 to early 2017. The Arkyd 100 is designed to do earth observations and locate asteroids. It will be followed by the Arkyd 200, designed to collect scientific data on physical characteristics of an asteroid; and the Arkyd 300, which will feature a larger propulsion system to allow deep-space exploration.

The Future of Aerospace Manufacturing

3D Systems printers are playing a central role across the entire product development spectrum for Arkyd, from prototyping designs to manufacturing production parts for actual spacecraft.

Planetary Resources uses SLA for QuickCast prototypes and production parts such as the fuel tank, a ProJet 7000 SLA printer for plastic prototypes, and a ProX DMP for direct metal printing.

“3D printing enables us to experiment with design concepts and produce better-functioning production parts much quicker, without worrying about the processes involved with traditional manufacturing,” says Lewicki.

“We’re transitioning from subtractive to additive manufacturing. 3D printing has come of age and we believe it represents the future of aerospace manufacturing.”


Showcasing H13 Tool Steel: Specs and Video of OUR FIRST PRINT!

Hello, World! Matt Jones from Miller 3D here with the newest, exciting developments for the Markforged Metal X!

Today we decided to showcase the newest material that has been released by our partner: H13 Tool Steel.

 

You can check out the video to see our very first print of H13 Tool Steel in action in this post!!

If you didn’t know already, H13 Tool Steel is a game changer for manufacturing outlets demanding the strongest metal prints for their shops. H13 Tool Steel isn’t only well-known for its incredible strength: it has a very high wear resistance to thermal shock. The concentration of Vanadium in the material helps handle abrasion-focused applications at both high and low temps.

Because H13 also always provides a uniform and high level of machinability, this tool steel is often used for aluminum, zinc, and magnesium die casting.

H13 Tool Steel is also invulnerable to hot cracking, a problematic casting defect that the industry is all-too-familiar with the costly pains of reproduction.

Here are some basic specs on H13 Tool Steel:

min max
Hardness BHN 235 262
HRC 40 46
Composition Chromium 4.70% 5.50%
Molybdenum 1.30% 1.70%
Silicon 0.80% 1.20%
Vandium 0.80% 1.20%
Carbon 0.30% 0.45%
Maganese 0.20% 0.50%
Phosphorous 0.00% 0.03%
Sulfur 0.00% 0.03%
Iron bal bal

Can You Take the Heat? Miller 3D Prints Fixtures to Withstand Scorching Temperatures

3D printing applications are seemingly endless. Today, automotive companies 3D print to shred operating costs, retailers 3D print to reduce waste, doctors 3D print to save lives. It’s remarkable how materials such as nylon, fiberglass and Kevlar can be 3D printed and applied to push the boundaries of innovation.

Miller 3D was given the opportunity to push the boundaries of innovation, manufacturing parts using some of the world’s strongest materials that also maintain integrity when exposed to blistering heat.

3D print fixtures heat temperature

Mark X printing the Astronics’ fixture

A local company, Astronics Corporation, a leading supplier of advanced technologies and products to the global aerospace, defense and semiconductor industries, recently had the need for fixtures to support one of their upcoming projects. Astronics’ engineers approached Miller 3D with a project that would ultimately be manufactured with Markforged 3D printed materials. 

“Due to the high mechanical properties of Markforged materials, we were able to successfully 3D print many of the required fixtures to fit Astronics’ needs”, Matt Jones, Manager at Miller 3D, explains.

The machine responsible for bringing these fixtures to life is the Mark X, a large 3D printer that can focus down to a 50-micron resolution and build high-strength, precision end-use parts from materials like carbon fiber, or in this case, Onyx.

For reference, the diameter of a human hair is 50 microns, 40 microns is considered the lower limit of visibility of a human eye, and a 25-micron resolution is necessary to see white blood cells.

3D Printed Fixture made from Onyx

3D printed fixture made from Onyx

Astronics’ fixtures were printed out of Onyx, which is a chopped carbon fiber nylon mix reinforced with high temperature fiberglass. 

Matt adds that continuous fiber high temperature fiberglass was key in maintaining part accuracy and preventing warping during the heating process.

So, how hot? The parameters that these fixtures needed to withstand were 180 degrees Celsius or 356 degrees Fahrenheit for approximately two hours. The Astronics engineers were also able to include geometry into this fixture that could only be 3D printed, not machined, that improved the functionality of the fixture.

A case where engineers can manufacture to true design intent and drastically reduce the cost and timeframe using 3D printing.