March 13, 2018 Volume 14 Issue 10

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.


New method optimizes internal lattice structures for creating lightweight materials that are stiffer and stronger

Advances in materials engineering have led to the development of strong and stiff lightweight structures that are transforming aerospace, automotive, and medical industries.

Scientists at A*STAR's Singapore Institute of Manufacturing Technology have invented a new method that uses additive manufacturing techniques to create lightweight lattice structures with greatly improved stiffness and strength*, paving the way for new impact-absorbing and sandwich structures.

The design and optimization of lightweight cellular and lattice structures is an emerging field made possible by advances in metal and polymer additive manufacturing, such as the ability to accurately print highly complex geometries.

By mimicking structures occurring in nature, Stephen Daynes and colleagues from the Singapore Institute of Manufacturing Technology have developed a method to create these new robust materials in collaboration with researchers from the National University of Singapore.

"Lattice structures exceed the structural performance of conventional solid materials for use in lightweight sandwich cores, medical implants, and a new class of lattice-type metamaterials with specific mechanical and thermal properties," explains Daynes. "Using a new biomimetic method, we were able to create cellular and lattice structures similar to those seen in bamboo and human bones."

The researchers determined the principal lines of stress, called isostatic lines, in the lattice using a method that combines topology and size optimization. This approach allows the size, shape, and orientation of each cell in the structure to be tailored, significantly reducing the stress between neighboring lattice cells.

The researchers compared the performance of their graded lattice structure with a uniform lattice core and found that their optimized design had increased stiffness by 172 percent and strength by 100 percent.

Lattice designs: (top) uniform benchmark, (middle) diameter graded, and (bottom) spatially graded. [Credit: Elsevier]

 

 

"Our technique can create lightweight, functionally graded lattices that greatly improve the stiffness and strength of additively manufactured sandwich structures without increasing their mass," says Daynes. "These structures are particularly well suited to additive manufacturing processes, since they are largely unconstrained by manufacturing complexity."

"We plan to apply the methodology to three-dimensional stress fields, where employing spatially graded lattices can lead to novel and more weight-efficient materials," says Daynes.

* Stephen Daynes et al. "Optimisation of functionally graded lattice structures using isostatic lines, Materials & Design (2017). DOI: 10.1016/j.matdes.2017.04.082

Source: Agency for Science, Technology and Research (A*STAR), Singapore

Published March 2018

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