Tuesday, March 8, 2016

Multi Head Spindles : Old technology but still highly productive

Multi Head Spindles typically comprise two generic types as either i) small taper mounted mini gearbox driven units designed to be used with a conventional single spindle CNC machine. Typically useful for auxiliary operations or where the user requires maximum flexibility or used as a single spindle speed increaser or ii) a larger dedicated multi stage precision gearbox driven from a single input shaft through a secondary gearbox before splitting into multiple pitched individual spindles comprise sometimes in groups of spindles in excess of 24 pieces driven at relatively low speeds  less than 1500rpm in parallel. In most cases this type of work is used for high volume production of automotive components with engine head and block being the most common for drilling and tapping of aluminium or cast iron components. The technology has fallen slightly out of favour in recent decades due to the advent of high speed single or twin spindle CNC machines with tool changing capability as a standard machine. This type of next generation standardisation allows automotive customers to have mixed model production and flexibility on the introduction of new component modifications or variants but it does require a higher floor space and possible initial investment in the first phase.

Picture of modern CNC machining lines using single or twin spindle technology
Recent investments of modern CNC machinery in automotive manufacturing plants have typically been of the newer type not utilising dedicated multi head spindles but a substantial installed base remains amongst older plants in OEM's as well in the 1st and 2nd tier supply chain. Kuroda Jena Tec possesses unique design and multi head spindle capability  (From it's Systematic both in terms of design, manufacturing as well as repair of existing older designs of multi head. This includes the ability to reverse engineer critical spare parts that may no longer be available commercially from the original supplier. This becomes extremely important where multi head spindle gearboxes and sub spindles utilise special gear pitches, seals and bronze bushes which are normally of a non-standard type. Kuroda Jena Tec can therefore provide and stock spare parts packages also to support planned or reactive repair work.
Systematic Multi Heads 
Examples of new multi head spindles able to be provided by Kuroda Jena Tec

As always in the repair business, capability and speed of response is critical and Kuroda Jena Tec prides itself on the ability to provide its customers with a high standard of reactive service particularly in the automotive sector. Where engineering projects are required perhaps for the planned upgrade to a new component modification, Kuroda Jena Tec also possess the design and manufacturing competence to analyse the engineering component with the customer to design a new spindle head where required, manufacture, assemble, test and assist customer with the on-site integration and machining trials. 

Example of emergency breakdown work performed by Kuroda Jena Tec for a leading automotive OEM

For more details on how Kuroda Jena Tec can supply your requirements please visit our websites on www.jena-tec.com  www.jena-tec.co.uk www.jena-tec.de 

Linear Actuators : Repair don't always replace.......

Linear actuators come in many shapes and sizes from low cost units for inaccurate actuation  with an integrated low cost stepper motor through to long length belt drive units for component handling to high force cylinder type actuation for forming and pressing processes. In many cases, customers are unaware of the ability to repair these units which can be achieved cost-effectively via a specialist asset repair organisation such as Kuroda Jena Tec. Using state of the art test rigs and motor/drive configurations, Kuroda Jena Tec can strip most makes and types of actuator to repair, replace and re-assemble back to OEM standards at a fraction of the cost compared to buying new Where damage sustained is excessive meaning repair is not cost effective, Kuroda Jena Tec have a range of carriage and cylinder type ballscrew actuators which may be suitable as a replacement upgrade. For more information, go to www.jena-tec.co.uk or call +44 (0)1623 726010

Friday, March 4, 2016

Modular grinding heads offer versatility to VTL's

Avoiding the need for expensive investment in new grinding machines or excessive costs in subcontract can be realised through the addition of a modular grinding head for use with Vertical Turning Lathe's (VTL's). Kuroda Jena Tec have a specific range of WBSVH units designed for horizontal or vertical applications which with the addition of an inverter system can be easily retrofitted to an existing manual machine tool. Used in a variety of applications ranging from grinding of stellite hard facing or machining honeycomb rings in aerospace blade casings, the addition of a modular unit is a highly cost effective way to add capability to equipment already located in the customers factory. Kuroda Jena Tec also produce units in its TPG series for use with horizontal lathes for both internal and external grinding. Custom designed inverter packages can be supplied as a complete modular retrofit.

Monday, February 29, 2016

Development of ultrasonically assisted machining capability

Kuroda Jena Tec, an established manufacturer of motorised machining spindles for grinding, milling and turning has seen active growth in new orders for contract research in the field of ultrasonically assisted machining. Since 2011, Kuroda Jena Tec has developed ultrasonically assisted grinding spindle prototypes for heavy duty grinding of hard materials through the development of a modular grinding unit providing 20kHz frequency oscillation axially between 6-12 microns. This exciting process capability provides some clear benefits in terms of material processing speeds, tool wear and mechanical material properties. Designed in-house to provide different characteristics according to the application, Kuroda Jena Tec have subsequently designed and supplied a light weight drilling spindle with up to 40kHz oscillation for composite materials to a leading UK research organisation. Further development and application work is planned in this exciting area with research organisations and other leading machine tool OEM's.
For more details on how Kuroda Jena Tec can supply your requirements please visit our websites on www.jena-tec.com www.jena-tec.co.uk www.jena-tec.de

Monday, February 22, 2016

Modernisation of Production Machinery

In a similar vein to design of new automation equipment, Kuroda Jena Tec is a one stop shop for automation and machinery components and has utilised this capability for the modernisation of production machinery both internally as well as for external customers. The example shown below is an Okamoto surface grinding machine that underwent a complete mechanical refurbishment of spindle, bedway as well as replaceable components and hydraulics system. The refurbishment was conducted within Kuroda Jena Tec's UK facility and overhauled within a 4 week period before being returning to the customer production facility.
Similarly a leading machine tool producer's service department had a modular grinding attachment used to grind spindle tapers in-situ and Kuroda Jena Tec was pleased to refurbish this unit and renovate it back to original specifications. The attachment was stripped and serviced with a change of bearings, re-grinding of the tool interface and refurbishment of all other serviceable parts.
At the other end of the scale in terms of complexity and contract value, Kuroda Jena Tec's transfer machine know-how came into play when performing a major $1m retrofit and turn key upgrade to a 3 station Marwin rotary transfer line for a 1st tier automotive supplier which comprised of multiple new machining spindle heads and gearboxes, hydraulic slides, guarding, fixturing and new PLC programming for additional machining operations to be utilised on a new part variant. The 6 month contract entailed design and manufacture of modules followed by a site installation over a 3 week shut down period before successfully returning the machining line into production.
More great examples of the versatility of the Kuroda Jena Tec group. For more details on how we can supply your requirements please visit our websites on www.jena-tec.com www.jena-tec.co.uk www.jena-tec.de

Design & Manufacture of Automotive Testing Stations

Kuroda Jena Tec's capability in linear motion components and asset repair is well known but additional automation capability is becoming an increasing demand of Kuroda Jena Tec's UK facility as requests from customers for more value added services increases. A recent example is the design, manufacture, assembly and test of a special purpose automated test rig for an automotive customer for engine components to determine whether sand from the casting process was contaminated in the component prior to subsequent machining operations. Kuroda Jena Tec worked with the customer to originate a specification of testing station able to automatically process aluminium engine parts at a high throughput rate and use air flow to determine go or no-go process limits. Where parts had insufficient airflow, they were automatically ejected from the production line for further inspection and rectification. Kuroda Jena Tec undertook the complete turnkey system design through to implementation in the customers' production line. For more details on how Kuroda Jena Tec can supply your requirements please visit our websites on www.jena-tec.com www.jena-tec.co.uk www.jena-tec.de