Virtual Timesavers showroom now open

Launched to coincide with the arrival of its latest deburring, edge rounding and finishing machine – the 22 series WRBW – the Timesavers online virtual showroom provides access to all the information customers may need, including video tours of each machine.

While face-to-face meetings have proved difficult, if not impossible during the COVID-19 pandemic, this online portal provides potential and existing customers with the information they need to move towards a solution for efficient sheet metal processing.
Although the complete Timesavers product range is available to view in the online showroom, the current focus is on its latest development, the 22 series 600 WRBW, which combines all of the technological and mechanical developments in the larger 32 and 42 series deburring machines, such as a uniform result, even wear of the tooling, high production capacity, and industry 4.0 functionalities in a 600 mm wide platform. The 22 series WRBW is now the company’s most compact rotary brushing machine, and is said to deliver premium Timesavers deburring, rounding and finishing results.
Suitable for customers with smaller production demands and associated budgets, the 22 series WRBW is constructed with a vacuum belt to transfer parts through the first abrasive belt to remove burrs. Then, processing by the four rotary brushes is performed to round external and internal edges (and remove laser oxide skin if specified), with a second belt providing the surface finish requirements to deliver fully deburred and rounded parts. The machine’s arrival marks the completion of the Timesavers RB range for premium deburring and rounding at every budget and capacity.
For further information www.timesaversint.com/online-showroom

Enhance mould finish with Tyrax ESR

Modern technologies are continuously creating new demands on the surface finish of moulded plastic parts. For high-gloss surface demands, mould tool designers should aim to use a steel grade with good ‘polishability’.

Tyrax ESR is a new high-hardness, corrosion-resistant tool steel from Uddeholm, developed for applications with extreme demands on surface finish.
The surface finish of a mould is dependent on the polisher’s technique, in combination with the microstructure and cleanliness of the tool steel. Uneven hardness across the surface means an uneven removal of material during the polishing process, where harder areas will resist abrasion better than softer areas. Uneven hardness may be the result of impurities in the steel and segregations.
Two of the most common polishing defects are pitting and orange peel. Pitting looks like scattered pinholes dispersed over the surface, and is usually due to pull-outs of hard particles, such as carbides or oxides. The best way to avoid such problems is to choose a very clean steel, such as an ESR grade, with fine and evenly distributed carbides. Pitting can also arise if the mould is stored in a humid environment, where localised corrosion attacks may cause pits at the mould surface. In such cases, a corrosion resistant tool steel is required.
Orange peel means that the surface morphology looks similar to an orange peel, as caused by plastic deformation at the mould surface. The best way to reduce the risk of orange peel is to choose a tool steel with a homogeneous microstructure, such as an ESR grade, in combination with high hardness.
The chemical analysis of Uddeholm Tyrax ESR enables the polisher to reach a high gloss surface finish in three polishing steps, compared with five steps for AISI 420 ESR, reducing the polishing time by 40-50%.
For further information www.uddenholm.com

Customised production with Stratasys 3D printing

Marchesini Group S.p.A. is an Italian manufacturer of automated packaging machinery and an established supplier to some of the biggest names in the pharmaceutical, cosmetic and food industries. As one of Stratasys’ largest customers in Europe, the company has revealed how it has embraced an entirely customised production business model to meet the needs of the international packaging sector – with its arsenal of industrial-grade Stratasys 3D printers at the heart of its manufacturing operation.

Headquartered in Pianoro, Marchesini Group has a dedicated 3D printing facility featuring 10 Stratasys production-grade FDM 3D printers – a large-scale Fortus 900mc, four Fortus 450mc and five F270 systems – as well as two PolyJet multi-material 3D printers. The technology is used throughout the design, development and manufacture of the company’s flagship cartoning machines, as well as several other packaging lines. Every machine produced is tailored to a specific industry or customer’s production process, which is critical in ensuring optimum performance and efficiency when deployed in the field.
“At Marchesini Group we say that ‘extra-ordinary is our ordinary’, meaning that we are faced with challenging, entirely customised projects on an almost daily basis,” says Mirko Fortunati, who is responsible for co-ordinating the mechanical workshops at Marchesini Group. “However, producing complex, bespoke parts with traditional manufacturing methods has proved extremely costly and
time consuming, which is no longer suited to the growing demands of today’s packaging manufacturing industry.
“Importantly for our business, Stratasys additive manufacturing has enabled us to overcome these issues and adopt a customised production model,” he continues. “Integrating industrial-grade FDM 3D printers into our production process has drastically reduced our part lead times from several weeks to a few days. Added to that, we can cost-effectively produce the exact quantity of parts we need, without requiring expensive tooling or machining. Having this on-demand production capability enables our engineers to take advantage of the greater design freedom enabled by 3D printing, which has empowered Marchesini Group to achieve higher-quality results for our customers.”

Importantly, this on-demand production capability also extends to maintenance and repair. With its packaging machines installed at customer locations throughout the world, the company is now able to quickly and cost-effectively 3D print customised replacement parts on-demand with no minimum order requirement. Not only does this allow Marchesini Group to deliver spare parts to customers in record time, it eradicates the need for costly storage facilities of spare inventory.
The team at Marchesini has 3D printed thousands of functional parts and components for its packaging machines, including protective cases, cable support systems and junction boxes, to name but a few. These applications are particularly important for the company’s robotic packaging systems, where every single component matters in order to ensure the robot’s agility, precision and speed of movement. This is an area where high-performance 3D printing materials have made a big impact.
“Using tough thermoplastics such as Stratasys’ FDM Nylon 12CF filament or ULTEM 9085 resin in place of traditionally machined metal components, has enabled us to reduce the weight of some parts by at least 30%,” explains Fortunati. “This not only increases the speed of movement and productivity of the robot for our customers, but it lessens the rate of degradation. In addition, these 3D printing materials comply with specific industry regulations, which importantly enables us to expand this technology into even more production applications – helping us to further innovate our products for customers.”
Marchesini Group is also using Stratasys PolyJet technology to produce components for applications requiring the combination of two or more materials.
“One great example of this technology is for the production of grasping pincers, which are designed to handle light items such as package leaflets or smaller jars,” explains Fortunati. “With the advanced multi-material 3D printing capability, we can produce complex designs that combine hard and rubber-like materials in a single print – something that would typically take multiple processes to create, costing us time and money.”

The battery of Stratasys 3D printers within Marchesini Group’s additive manufacturing department is currently running round the clock.
Fortunati concludes: “It’s fair to say that additive manufacturing is an integral part of Marchesini Group production. In 2019 alone, we recorded a total of 22,480 hours of operation for our FDM 3D printing equipment – equating to almost 15 hours a day. And for our two PolyJet 3D printers, a total of 1700 hours of operation, the equivalent of about 8 hours a day. As we continue to expand these technologies across our design and production process, we can expect these figures to be even higher in the future.”
Established in 1974 by virtue of the shrewd intuition of Massimo Marchesini, over the years the company has grown from a small, local business into a major industrial enterprise, thanks to a continuous process of mergers and acquisitions of complementary companies. Despite its present-day multinational dimension, the group has never betrayed the human spirit and artisan production that characterised its early days, and these traits still exist today alongside the latest innovations in robotics and digitalisation.
For further information www.stratasys.com

Are grinder guards over-designed?

Guards on grinding machines are particularly important for ensuring operator safety. Grinding wheels seldom burst, but when they do, there is a great risk of serious injury to the machine operator. Recent studies suggest, however, that the enclosures commonly used in gear grinding machines, for example, could be over-designed.

Investigations conducted by the VDW (German Machine Tool Builders’ Association) and the Institute of Machine Tools and Factory Management (IWF) at TU Berlin, reveal that it is possible to use safety guards which are up to 70% thinner, depending on the width of the grinding wheel. These findings are now leading to changes in ISO standardisation.
The minimum wall thicknesses for safety guards are specified in ISO 16089. For example, there is a directly proportionate link between the requirements concerning primary protective covers for gear grinding machines and those for the full enclosures located further away. The reason is that no specific safety precautions were initially specified for the safety guards of gear grinding machines as they were not explicitly included in the preceding standard, EN 13218. However, this proportionate scaling has been repeatedly questioned, including by the JMTBA, as it results in overdesigned polycarbonate safety guards and screens.
“Our burst and impact tests showed that the thickness of the enclosure wall can be reduced by up to 70%, depending on the width of the grinding wheel,” explains Simon Thom, group leader for machine tool technology at IWF (TU Berlin). “This is very good news for the machine tool manufacturers, who are keen to avoid excess weight in their machines. Reducing the thickness of a sheet steel housing by half a millimetre, for example, will save 4 kg/m2 in weight.”
For further information www.vdw.de

Entry level universal grinder

A new universal cylindrical grinding machine from Swiss specialist Kellenberger majors on providing high value at the entry level, while offering reliability, precision and high productivity via its state-of-the-art intuitive programming function.

Available in the UK from Jones & Shipman Hardinge, the Kellenberger 10 (K10) combines proven technology using many Kellenberger components and sub-assemblies from the established K100 machine, coupled with the latest programming technology. For instance, Kellenberger Blue teach/programming software enables semi-skilled operators to use the machine, thereby optimising use of the work team. Kellenberger Blue solution software is accessed through a FANUC 0i-TFP CNC control with a 19” touch screen.
In standard format, the machine can accommodate workpieces up to 1000 x 400 mm in size with a top table weight capacity of 100 kg. The table profile is also a proven Kellenberger design with the full length wheel dressing interface located on its rear to reduce re-tooling work and extend wheel dressing possibilities.
K10 models feature generous X and Z-axis strokes (365 mm in X, 1150 mm in Z), collision-free operation and dressing ratios. The low-maintenance, high-precision linear guide on the X axis and the flat sliding V guides on the Z axis are equipped with optical absolute linear position measuring systems. Furthermore, the B axis is designed as an automatic indexing axis (1° Hirth gearing) with high positioning accuracy and a +30°/-210° swivel range.
The K10 also offers the ability for users to expand or customise its capability by adding a range of optional equipment such as a second external grinding wheel, larger grinding wheels, a tailstock, gap control and balance sensors, and measurement control via probing.
For further information www.hardinge.com