August 14, 2018 Volume 14 Issue 30

Mechanical News & Products

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New nickel-based superalloy for 3D printing

Velo3D has qualified the nickel-based superalloy powder Amperprint 0233 Haynes 282 for use in its Sapphire family of printers. The material is designed for high creep strength, thermal stability, weldability, and fabricability not commonly found in other alloys. This superalloy is ideal for high-temperature structural applications like energy generation, gas turbines, and space launch vehicles to build parts like heat exchangers, combustors, nozzles, combustion liners, rocket engines, and shrouded impellers. Shown left is a combustor liner made with the new superalloy. It features 23,000 unique holes for optimized air-to-fuel ratios and internal channels for regenerative cooling. The part is shown as printed, with no supports.
Learn more.


Roller-type LM guide for ultra-heavy loads

THK's model HRX is the company's roller-type linear motion (LM) guide. It features ultra-high rigidity in addition to the ability to handle ultra-heavy loads. On the HRX, each row of rollers is arranged at an angle of 45 degrees. This ensures the LM block receives an equal load rating (high rigidity) in all directions. Made for the development of high-precision, energy-saving, high-speed machines with long service lives.
Learn more.


Live tooling for popular turning center lines

Heimatec, a world leader in live tools and multi-spindle drill heads, announces the immediate availability of live tooling for all popular models in the Hyundai, Miyano, and Nakamura turning center lines. According to Preben Hansen, president of Platinum Tooling Technologies and master North American importer for Heimatec, "We're carrying a substantial inventory of live tools for our customers' machines now, and it represents a substantial financial and warehouse-space commitment we've made to support them in the North American market."
Learn more.


MW Components launches eCommerce experience

MW OnDemand combines over 1 million parts from well-known brands such as Century Spring, Accurate Screw Machine, RAF Electronic Hardware, Servometer, and Maudlin into a single location. Customers can select and purchase products from across the MW Components portfolio, simplifying the entire component sourcing process. Customers can shop tens of thousands of stock spring designs along with fasteners, shims, electrical contacts, metal stampings, tubing products, bellows, and more.
Learn more.


Desktop Metal qualifies 420 stainless steel for high-volume additive manufacturing

Desktop Metal recently announced the qualification of Grade 420 stainless steel (420 SS) for use on its Production System platform, which leverages patent-pending Single Pass Jetting (SPJ) technology designed to achieve the fastest build speeds in the metal additive manufacturing industry. Manufacturers can now leverage SPJ technology for the mass production of high-strength, end-use parts in 420 SS for demanding applications in industries such as medical, aerospace, defense, and consumer products.
Learn more.


Engineer's Toolbox:
How to select the proper pin for your application

Fasteners are some of the most important parts of an assembly. In this technical article, Jeff Greenwood from SPIROL focuses on how to select the proper pin for your application, including pins used as hinges, hub and shaft fixtures, alignment, movement stops, and joining. Press fit pins are discussed here, as they are the most common type of pins used in modern manufacturing. Lots of good info and examples in this one.
Read the full article.


New PETs for automotive exterior components

Polyplastics Group has introduced two new RENATUS polyethylene terephthalate (PET) grades that deliver superior mechanical properties, appearance, and weather resistance for automotive exterior components. RH030 (30% glass filled) and RH045 (45% glass filled) maintain their jet blackness and reduce whitening on the surface of molded articles in outdoor environments, making them ideally suited for applications such as automotive side mirrors and rear wiper arms/blades. Since PET parts are not painted, weathering degradation can occur over time when the glass filler starts to float and the jet blackness decreases. Accelerated weather resistance testing demonstrates that Polyplastics' new PET materials maintain lower index values than competing products, indicating that whitening is being reduced.
Learn more.


Quick release couplings with safety lock

To reduce the time involved in setting up equipment and production lines, JW Winco has incorporated a new coupling in its product portfolio. With the GN 1050 quick release coupling, components can be quickly and securely connected to a machine or device with just a click. A safety locking button protects the coupling from being accidentally opened.
Read the full article.


Wheel nut can't loosen by itself -- even in extreme applications

Designed for flat-faced steel rims, the Nord-Lock wheel nut safely secures wheels on on-road and off-road heavy vehicles by maintaining high clamping force even under extreme operating conditions. When assembled correctly, the Nord-Lock wheel nut cannot loosen by itself. It's a simple and cost-effective way to make wheels safe and secure for more productive and efficient operations.
See how Nord-Lock wheel nuts work.


Join carbon materials and more with innovative C-Solder

C-Solder tin-based soldering alloys from Goodfellow enable the joining of carbon materials as well as carbon to metals (copper, aluminum) and aluminum to aluminum. The resulting bond is mechanically strong and electrically conductive. C-Solder is both flux-free and lead-free, has a melting point of 232 degrees C (solidus temperature), has excellent flow, does not leave a residue, and is not affected by cleaning solvents.
View the 1-minute video.
Learn more from Goodfellow.


Tiny crossed roller bearings boast big capabilities

IKO International has unveiled its newest crossed roller bearing, the CRBT105A. This ultra-small, ultra-thin unit is designed to provide exceptional rigidity for space-constrained automated machine applications such as robots with articulating arms and compact surveillance cameras. The CRBT105A features a 10-mm bore diameter, 21-mm outside diameter, and a narrow width of 5 mm. Despite its compact size, this bearing offers rigidity up to four times greater than double-row angular contact ball-type bearings.
Learn more.


Steel disc couplings with updated design offer backlash-free operation in drive applications

RINGFEDER has released an updated version of its proven TND Series of steel disc couplings, which feature backlash-free torque transmission and excellent positioning accuracy in machines that involve synchronous operation, frequent starts and stops, or reversing operations. Typical drive applications include printing and packaging machines, compressors, pumps, and variable speed drives. Two coupling types are available: High Deflection (HD), which offers excellent shaft misalignment compensation, and High Torque (HT), which incorporates a higher power density. TND Series couplings achieve superior concentricity, maximum operational reliability, smooth operation, and low vibration levels.
Learn more.


Custom modifications for material handling rollers and bumpers

Imao-Fixtureworks offers custom modifications for its standard material handling rollers and bumpers. By modifying off-the-shelf products, a significant amount of time and money is saved. The products can be custom modified in various dimensions, shapes, and sizes to meet specific application requirements. For example, the outside diameter (O.D.) of a roller could be turned down, or a bumper of a certain width could be produced. These modifications eliminate the typical design and production time necessary for a custom roller or bumper to be tooled up and molded.
Learn more.


Optimal damping: Continental develops special bearings and other elements for EVs

Continental has developed special elastomer compounds for electric vehicles. They absorb the vibrations in the high-frequency range and are also lightweight. The company is also adapting other bearing elements such as battery mounts for buses or air press bearings in truck driver cabs to the requirements of e-mobility.
Read the full article.


Advanced graphenes for composites and thermoplastic applications

NeoGraf Solutions has extended its range of next-gen graphite materials with the launch of Graf-X graphene nanoplatelets (GNP) and graphene precursors (GP). Both high-performance additive materials deliver enhanced strength, performance, and reliability in a broad range of thermoset and thermoplastic applications. The new graphene materials can increase the toughness of plastics by up to 2.5 times without a significant weight increase. They can also double thermal conductivity and push the electrical conductivity of plastics into the anti-static and static-dissipative ranges.
Learn more.


Is your metal too 'gummy' to cut? Draw on it with a Sharpie or glue stick

Your everyday permanent markers, glue sticks, and packing tape may offer a surprisingly low-tech solution to a long-standing nuisance in the manufacturing industry: Making soft and ductile, or so-called "gummy" metals, easier to cut.

What makes inks and adhesives effective isn't their chemical content, but their stickiness to the surface of any gummy metal such as nickel, aluminum, stainless steels, or copper. Such was the finding of researchers at Purdue University and the University of West Florida in a study recently published in Physical Review Applied.

These adhesives help achieve a smoother, cleaner, and faster cut than current machining processes, impacting applications ranging from the manufacturing of orthopedic implants and surgical instruments to aerospace components.

"A wide range of products rely on the machining of gummy metals. These could be something we use every day, such as the valve in a sink faucet, or something more critical like a compressor part in the jet engine of an airplane," said James Mann, assistant professor of mechanical engineering at the University of West Florida and Purdue alumnus.

If a significant improvement can be made to the "machinability" of gummy metals or alloys -- which is how well they cut, drill, or grind -- then there is potential to lower the cost of products, improve their performance, or enable new and improved designs.

"Gummy metals characteristically deform in a very wiggly manner," said Srinivasan Chandrasekar, Purdue professor of industrial engineering. "This wiggly flow involves significant energy consumption, which means that these metals require more force to machine than even some hard metals. We needed to find a way to suppress this wiggly flow."

Getting rid of the wiggles means that the metal now tends to act more like a brittle ceramic or glass in the spot where it needs to be cut.

Purdue researchers have discovered a simple solution for cutting soft gummy metals (left) just as cleanly and easily as hard metals (right). [Credit: Purdue University image/Anirudh Udupa]

 

 

 

 

One well-known way to make the gummy metal brittle is by coating it with a suitable liquid metal, such as gallium in the case of aluminum. Liquid metals like these, however, tend to work too well; diffusing through the surface and causing the whole metal to crumble into a powder.

"This makes the metal being machined unusable," Chandrasekar said.

Other attempts met with limited success tended to be either toxic or result in tears and cracks on the machined surface. The researchers then began to explore other benign chemical media that would cut cleaner.

Marking with ink or attaching any adhesive on the metal's surface dramatically reduced the force of cutting without the whole metal falling apart, leaving a clean cut in seconds. The quality of the machined surface also greatly improved.

Stickiness didn't initially stand out as a solution that permanent markers, glue sticks, and tape have in common.

"We looked at the chemical ingredients of the permanent ink, isolated each of those on the metal's surface, and there was no noticeable effect," said Anirudh Udupa, lead author on the study and a postdoctoral researcher in Purdue's School of Industrial Engineering. "So we realized that it's not a particular chemical but the ink itself sticking to the metal through a physical adsorption mechanism."

The Sharpie and adhesives also appeared to work on many gummy metals, regardless of the cutting tool.

"In hindsight, we can tell you why certain things weren't successful in previous work. It all comes back to the existence of this wiggly flow," said Koushik Viswanathan, Purdue postdoctoral researcher in industrial engineering. "Some people might have been trying to cut copper, for example, that was in the hard state rather than in the soft state."

To the researchers' knowledge, using permanent markers, glues, or tape to make gummy metals easier to machine does not pose any environmental hazards.

Next, Chandrasekar's group will be assessing the degree of stickiness that works best for cutting gummy metals and exploring ways to advance the application of this technology into industrial practice.

This research is supported by the U.S. Army Research Office, the National Science Foundation, and the U.S. Department of Energy.

Source: Purdue University

Published August 2018

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