Feature Machine building/ frameworks & safety
New extrusions added to range New from Machine
Building Systems is the Line 10 Aluminium Profile System. Based on a 50mm module, there are seven new anodised aluminium extrusions from 50 x 50mm to 200 x 100mm, all with 10mm T-slot- ted grooves to enable the use of heavy-duty fastenings.
The extrusions are capable of accepting tensile loads up to 7000N, and have an enhanced profile cross-section for optimised use of raw materials whilst retaining the familiar external shape and profile grooves. A comprehensive range of accessories is also available for the construction of heavy-duty assemblies, including components for the attachment of levelling feet and panels. Machine Building Systems
www.mbsitem.co.uk Enter 231 Steel shafts
Steel shafts are frequently used in machines and are a basic compo- nent of circular guides, so to meet demand Misumi supplies over 550 types, offering more than one billion configuration options. Shafts are available in lengths from 10 to 1500mm, with diame- ters from three to 50mm. Variants are available in both the standard and precision accuracy classes, and in tolerance classes g6, h5 and f8. The products can also be opti- mised with surface treatments. The shafts can be configured with a high degree of accuracy and ordered to suit specific applica- tions, states the company. Misumi Europa T: +49 (0) 6196 77460 Enter 232
www.misumi-europe.com
Whether to choose high precision and top running behaviour or compromise on accuracy for the sake of freely combinable carriages and guide rails, was the decision every machine tool designer used to face when it came to selecting linear guides to construct linear axles. Now, however, NSK has intro- duced the PH linear guides, which allow carriages and rails of the same size to be freely combined – previously, this high accuracy was only possible through paired systems. As a result, it will be easier to produce machines and to replace precision
Linear guides enable carriage rail combinations Enter 233
linear guides during servicing. The new PH class is available with various different guide car- riage types in sizes 15 to 45. All of the designs run much smoother and offer significantly better guaranteed precision than the existing PC class, which already offers very good per- formance, claims the company. The new linear guides are suit- able for applications that require very quiet running, and are also rigid enough to be
used for demanding applications. NSK T: 0500 232 7464
www.nskeurope.com
Grippers handle
different size parts With its swivelling fingers, the PZH-SF large stroke gripper from Schunk enables components of different sizes to be handled in succession. Instead of changing the top jaws or the complete gripper each time, the fingers of the device swivel into another position. The opening stroke per finger amounts to 113mm in radial direction; and depending on the jaw position, the grip- per handles components with diameters between 100 and 430mm.
Capable of transmitting a power ratio nearly double its volume and mass, the gripper offers a gripping force of 1500N, handles workpieces up to 11.8kg (at a friction coefficient of µ=0.1) and achieves a safety factor that is twice as high. For larger diameters or special requirements, the length and the orienta- tion of the three swivelling arms, and also the length and shape of the fingers, can be individually adjusted. Monitoring can now be carried out reliably by magnetic field sensors or inductive sensors. Schunk Intec T: 01908 611127
www.gb.schunk.com
New assembly system carefully handles fragile solar industry components At is solar module factory in
Frankfurt, Conergy has merged together three production stages – from wafer production to cell, then module assembly – enabling gentler transportation of the very sensitive wafers and cells. This has been achieved by Förster & Krause installing a fully auto- matic, factory transport system. The very valuable, extremely
thin blanks are, due to the material properties, sensitive to damage and breakage, therefore handling and transportation from process to process must be per- formed with appropriate care. So, a production area of 35,000m2 handles up to 60 million cells, which are assembled into 1.2 mil- lion modules per year. Around 1000m of conveyor belt connect the process stations.
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More than 80 vertical convey- ors connect the machines with the conveyor belts, which travel at a height of 2.70m for empty boxes and at a height of 3.30m for full boxes. Two 12m high vertical conveyors connect the system between the building storeys, passing through two fire-protection collars.
At each junction within the material handling system, which includes approximately 100 belt changers, are Leuze’s PRK 3B retro-reflective photoelectric sen- sors. If, due to space reasons, no reflector can be mounted, HRTR 3B diffuse reflection light scan- ners ensure reliable detection of the wafer boxes. In addition to their compact construction, both products offer excellent back- ground suppression, a benefit
in bright sunlit rooms.
In addition to position detection on the conveyor belts and space monitoring at the transfer inter- faces and turning stations, optical data transceivers from Leuze are also used. They are used to com- municate between the high-bay storage devices of the small-parts stores and the store management system. Optical data transmission with infrared laser light to and from the moving high-bay storage devices occurs free of both contact and wear. The DDLS 200 optical data transceivers are likewise characterised by low interference susceptibility to noise from light sources. Optical data transceivers con- sist of a device pair and communi- cate bi-directionally, with each device functioning as a combined
Enter 234
transmitter and receiver unit. Network data is transmitted over a distance of up to 500m and benefits from being highly resis- tant to electrical interference as well as being contact-free and therefore wear-free.
Any linked system designed for fully automatic operation must have a means for manual intervention, to allow employees to manually load or remove prod- ucts, even if only for removing samples for quality control pur- poses. Therefore, on some of the process systems, the short conveyor belts at
the transfer
heads to the vertical conveyors open on one side and are equipped with SOLID-2E safety light curtains from Leuze. Leuze
www.leuze.co.uk OCTOBER 2011 Design Solutions 1971-2011
T: 01480 408500 Enter 235
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