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The new S31 – The versatile machine for large tasks

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The new S31 performs complex and varied grinding tasks precisely and reliably. It can be used to produce small to medium-sized workpieces with a distance between centers of 400, 650, 1000 and 1600 mm and a center height of 175 mm in individual, small batch and high volume production. With a high-resolution B-axis of 0.00005° the swiveling wheelhead enables efficient external, internal and surface grinding in a single clamping.

The foundation of the universal cylindrical grinding machine is the machine bed made from solid Granitan® S103. This provides high dimensional stability thanks to its favorable thermal behavior, while the mineral casting largely equalizes short-term variations in temperature. STUDER has redesigned the machine base geometry and added an innovative base temperature control. This ensures quick and stable production. The fixing of the dressing device on the double T-slot of the longitudinal slide drastically reduces the complexity of setup and changeover. A further highlight: The S31 features StuderGuide® guideways with their damping component in the direction of movement.

Very wide range of wheelhead variants

The S31 is based on the STUDER T-slide concept. It now has an extended X-axis stroke of 370 mm. This enables a large number of wheelhead variants, which can be precisely tailored to the customer’s requirements. Customers can choose between the turret wheelhead with continuously variable B-axis or B-axis with 1° Hirth coupling. The turret wheelhead can be equipped with several grinding wheels. Thanks to the software for grinding wheel alignment, STUDER Quick-Set, changeover times are reduced by up to 90 percent. The new S31 enables grinding of different diameters and cones with just one grinding wheel and without time-consuming intermediate dressing. This is made possible by the direct drive on the B-axis with a positioning scatter of <1“.  

Impressive software

Over a hundred years of grinding experience are invested in StuderWIN, which enables reliable programming and efficient operation. StuderTechnology also automatically calculates the optimal grinding parameters in a matter of seconds, based on just a little information. This means good quality and a stable process at the first attempt.  The optional integrated modules such as StuderForm, StuderThread or StuderContourBasic, extend the functionality of the machine.

The S31 is equipped with a Fanuc 0i-TF and is optionally available with the Fanuc 31i-B for High Speed Machining (HSM). The PCU manual control unit enables setup of the machine close to the grinding process. Non-productive times can be reduced to a minimum with the electronic contact detection function. In addition, the standardized loader interface enables automation of the S31.

Advantages at a glance

  • Distances between centers 400, 650, 1000, 1600 mm
  • Height of centers 175 mm
  • Maximum workpiece weight 150 kg
  • StuderGuide® in longitudinal and cross slides
  • Thermal stability thanks to innovative base temperature control (dbc 650 to 1600 )
  • Double T-slot for dressing systems
  • Numerous grinding head variants
  • Direct drive on B-axis with high-resolution direct measuring system
  • Constant cutting speed as standard
  • StuderWIN software with StuderTechnology
  • Reduced setup and resetting times with STUDER Quick-Set
  • Can be flexibly extended with integrated software modules
  • Available with Fanuc 31i-B for HSM applications
  • Automatable

Workholding & Toolholding

Invitation to compete for the “Fritz Studer Award 2020” research prize

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STUDER is awarding its research prize, the “Fritz Studer Award”, for the sixth time. Students from European universities and technical colleges are invited to participate. The winners will receive a reward of CHF 10,000.

Fritz Studer AG produces standard machines and individual system solutions in high-precision cylindrical grinding for machining small and medium-sized workpieces.

STUDER is awarding the “Fritz Studer Award” for the sixth time. Participation in this competition provides young researchers with a platform for their creative solutions. The goal of the award is to advance and strengthen innovative developments in the machine industry.

For this competition STUDER is looking for work and research results with the following content:

  • Innovative machine concepts or components for precision machine tools
  • Alternative materials in machine construction
  • Simulation models for dynamic and thermal behavior of machine tools
  • Control and sensor concepts for machine tools
  • Digital Solutions to support the grinding process
  • New or advanced manufacturing technologies, especially in precision machining, such as grinding, hard turning etc.

Requirement: Substantiated results and feasibility

The research prize is aimed at graduates from European universities and technical colleges. Anyone who has focused on scientific topics or applied research areas in their student research project, college work or dissertation is invited to participate. The applicant should also be able to produce substantiated results or partial results from their research work. What is crucial for the assessment? Firstly, the feasibility of the findings in the machine industry. Secondly, the approach must be new. Scientific content, form and accuracy of the statements will also be assessed.

Award of CHF 10,000

A prestigious jury will assess the submitted entries and choose the winner or winners. The jury includes:

  • Prof. Dr.-Ing. Konrad Wegener, Director of the Institute of Machine Tools and Production at ETH Zurich
  • Dr.-Ing. Hans-Werner Hoffmeister, Head of Production Technology Department at the Institute for Machine Tools and Production Technology at TU Braunschweig
  • Dr.-Ing. Frank Fiebelkorn, Head of Research and Technology at Fritz Studer AG.

The winners will receive a reward of CHF 10,000, the Fritz Studer Award and a certificate. The award ceremony will take place in mid-February 2021.

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Workholding & Toolholding

A new lease of life for your machine

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45,000 operating hours. This is how long – or even longer – a 15-year old cylindrical grinding machine is in use. Anything that does this much will wear, and this particularly shows itself in the geometry and precision. High time to give the machine a good overhaul. A machine overhaul at STUDER makes an old machine into one that is as good as new; in other words, a machine that has the same tolerances as when it was first delivered. If the requirements on the machine have also changed, the machine can be configured and retrofitted to the customer’s requirements during the overhaul. 

The S40 was in use at LMT Kieninger for 14 years. The company specializes in highly demanding machining tasks and manufactures special tools for die and mold making. “The S40 was the Rolls Royce of grinding machines. But the machine still wears over time and after intensive use”, admits Heiko Braun, Group Manager of Cylindrical/Surface Grinding and Assembly. It was clear to LMT Kieninger that they should send the cylindrical grinding machine to the STUDER factory in Switzerland for an overhaul. STUDER provided them with a loan machine for around three months and took care of everything from A to Z – from collection through to customs formalities. “We were very satisfied with the loan machine. Apart from a few little things, we were able to continue grinding as usual”, sums up Braun. The special feature about a machine overhaul at STUDER? It is the only company to refurbish the machines’ guideways to the original specifications. After the assemblies have been reinstalled, the machine geometry is equivalent to that of a new machine. Braun’s view: “This point in particular really convinced us. We notice the difference. Since the overhaul we have been grinding with the precision of a new machine. I can only recommend a machine overhaul. Everything went without a hitch, the investment has paid off and a 1600 mm machine is worth its weight in gold for us.”

Rebuild – new from old

A rebuild, or a machine overhaul, makes sense, and not just economically. The operator gets his familiar machine back and continues where he stopped before the overhaul. But he is full of enthusiasm! Because his old machine is like new. In the STUDER factory the specialists disassemble the machine into all its individual parts. The guideways are completely refurbished, the assemblies overhauled, the wear parts in the electric cabinet replaced, hydraulic and lubricating system as well as all valves replaced. If old spare parts can no longer be obtained, STUDER provides an alternative solution. The casing and components are sand-blasted and then given a fresh coat of paint. After assembly the geometry is like that of a new machine. Commissioning is carried out by STUDER Customer Care, including a functional and geometry inspection, all CE-compliant. “Over 20 people work on machine overhauls at STUDER. This shows the value of rebuild and retrofit at STUDER. The customers are always enthusiastic about the transformation and are delighted to put an as-new machine into operation at an excellent price-performance ratio”, says Marcos Cotarelo, Divisional Head and Customer Care Consultant. 

Expanding the component range

If the customer wishes to expand his component range at the same time as the overhaul, he does this with a retrofit. During the machine overhaul the machine can be modified or retrofitted to the customer’s requirements. This opens up new production possibilities on the same machine. Ingold Tools AG has taken advantage of this STUDER service. 

Ingold Tools AG has been producing high-precision and complex parts for spindle, compressor, hydraulic and general machine manufacturing with 25 employees since 1946. The machinery includes a variety of CNC-controlled and conventional machines, including robot-automation solutions for turning, milling/drilling, honing, lapping, barrel finishing, sand-blasting, laser marking as well as surface and cylindrical grinding. The cylindrical grinding shop already has several conventional and CNC STUDER machines. A further machine is currently being overhauled in the STUDER production halls. This is an 18-year old S21 with two external spindles and continuous fine adjustment of the turret wheelhead (B-axis fine), which the two managing directors Christoph Jenzer and Edgar Stich recently took on as a second-hand machine. The S21 will not only be updated in line with the latest developments, but will also be retrofitted to suit the needs of Ingold Tools AG. The cylindrical grinding machine will have an additional internal grinding spindle for internal cylindrical grinding and the relevant fixture for swiveling the tailstock into the park position. The S21 will also have a new spindle cooling system with its own circuit, as well as a hydraulically swiveling dressing unit. So that all grinding machines have the same mounting, the universal tool headstock will also be upgraded from MK4 to MK5. “This deal is perfect for us. Thanks to the retrofit, we get the second-hand machine with 50 percent new hardware”, enthuses Jenzer. 

Trusted quality

The S21 is the second factory-rebuilt STUDER machine at Ingold Tools AG. In 2016 the company took on a second-hand S31 machine, which STUDER overhauled. “We grind to a bearing tolerance and diameter of 1my. STUDER guarantees this accuracy after the overhaul. Either way: An overhauled STUDER will run just as long as a new machine”, attests Stich. Jenzer and Stich see a further advantage of the machine overhaul in the operation: “The employees don’t have to get used to a new machine with a new control system.”

Ingold Tools has relied on STUDER since it was established in 1946. The first external cylindrical grinding machine was a type 01 from the year 1955. This was still in use when Christoph Jenzer joined the company 13 years ago. “We like working with STUDER. The service personnel are quick to respond, and our Customer Care Consultant supports us wherever he can. It’s not without reason that we have so many STUDER machines.” A new machine? Jenzer and Stich say: “We wouldn’t rule it out – a new machine always offers advantages which an old one doesn’t have, such as faster travel in all axes, simpler set-up of the machine, and easy programming with less technical knowledge.” But the employees are looking forward to the overhauled S21, which will soon be on its way to Inkwil in Bern. 

Machine overhaul at a glance

  • Machine base: Completely overhauled, ribbed guideways milled, recast and repainted.
  • Control cabinet: Replacement of wear parts in the electric cabinet.
  • Pneumatics: New valves, hoses and filters. 
  • Hydraulics: New hydraulic and lubricating system, all new valves and hoses.
  • Tool headstock: Completely overhauled.
  • Wheelhead: Completely overhauled.
  • Tailstock: Completely overhauled.
  • Axes: Tables as new, installation of new recirculating ball screw and bearings. 
  • Component casings: Sand-blasting, repainting, color according to STUDER design or customer requirement.
  • Control system: Existing control system is retained.
  • Delivery: Always with precise measurement of new machine tolerance including test certificates. 
  • Loan machine: We can provide a loan machine on request.
  • Renewed original CE certificate
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Workholding & Toolholding

The new S33 – The productive machine for individual requirements

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Universal and flexible. These are the features of the new S33, the CNC universal cylindrical grinding machine from STUDER. With distances between centers of 400, 650, 1000 and 1600 mm and a center height of 175 mm, it can be used for grinding small, medium-sized and large workpieces up to 150 kg in individual, small batch and high volume production. The changeover from grinding between centers to live spindle grinding is achieved in record time. Complex workpieces are ground in a single clamping without any problem.

The foundation of the S33 universal cylindrical grinding machine is the machine bed made from solid Granitan®S103.  Thanks to its favorable thermal behavior this provides high dimensional stability, while short-term variations in temperature are largely equalized by the mineral casting. STUDER has redesigned the machine base geometry and added an innovative base temperature control. This ensures quick and stable production. The fixing of the dressing device on the double T-slot of the longitudinal slide drastically reduces the complexity of setup and changeover.  

Wide range of wheelhead variants

The S33 is based on the STUDER T-slide concept. It now has an extended X-axis stroke of 370 mm. STUDER offers a number of wheelhead variants. The turret wheelhead can take up to two external and one internal grinding spindle and enables automatic swiveling with a 1° Hirth coupling. It is also equipped with the latest generation of gap control. The external wheelhead with a wheel on the right can be set to 0°, 15° and 30°. Setup and changeover costs can be reduced thanks to the turret wheelhead with several grinding wheels and quick setup with the Quick-Set software. Internal, external and surface grinding in a single clamping is child’s play for the S33 and leads to even higher efficiency in complete machining operations. Grinding of forms and threads is made possible by the C-axis with indirect or direct measuring system. The S33 can also be equipped with a chuck workhead for grinding chuck components.

Impressive software

Over a hundred years of grinding experience are invested in StuderWIN, which enables reliable programming and efficient operation. StuderTechnology also automatically calculates the exact grinding parameters in a matter of seconds, based on just a little information. This means good quality and a stable process at the first attempt. The optional integrated modules such as StuderForm, StuderThread or StuderContourBasic extend the functionality of the machine.

The PCU manual control unit enables setup of the machine close to the grinding process. Non-productive times can be reduced to a minimum with the electronic contact detection function. In addition, the standardized loader interface enables automation of the S33.

Advantages at a glance

  • Distances between centers 400, 650, 1000, 1600 mm
  • Center height 175 mm
  • Maximum workpiece weight 150 kg
  • Thermal stability thanks to innovative base temperature control (dbc 650 to 1600 )
  • Double T-slot for dressing systems
  • Numerous grinding head variants
  • Motor spindle including frequency converter for turret wheelhead
  • Constant cutting speed as standard
  • StuderWin software with StuderTechnology
  • Reduced setup and resetting times with STUDER Quick-Set
  • Can be flexibly extended with integrated software modules
  • Automatable
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