Current Trends in Machining Technologies Outlined at Show
01 Mar 2005
The Machining Research Group team at the University of Birmingham is ideally placed to outline high speed milling (HSM) and micro-machining developments, having worked on the former since the early 1990s and latterly on micro-machining technology. David Aspinwall and Leung Soo of the recently formed West Midlands Micro-Machining Centre (WMMMC), which comes under the remit of the Group, will be presenting the latest developments in machining technologies, during one of the many free seminar sessions at the Midlands Manufacturing event, (see preview on page 9) NEC, Birmingham, 13-14 April.
Using advanced HSM and electrodischarge machining (EDM) equipment purchased with the aid of regional development funding from Advantage West Midlands, the WMMMC has significantly enhanced the University's already considerable conventional and non-conventional machining facilities, which are arguably the best in any UK academic institution. The Group's research has extensive industrial support.
The talk kicks off with a brief introduction to HSM detailing terms and definitions, available machine tool technology and industrial applications, encompassing mould and die work relating to a number of industrial sectors and the growing aerospace field.
Current trends relating to machine tool developments and tooling include: spindle speeds at 40,000rpm upwards;5-axis machine configurations; and multi-function/ duplex systems involving one or more manufacturing processes in addition to end milling.
Here, laser/HSM and grinding/HSM systems are prevalent. However on the micro-machining front, machines able to accommodate four or more processes on one platform have recently appeared.
Machines such as the DT125 from Mikrotools is able to accomplish high speed milling, electro-chemical machining, drilling and electrical discharge machining in various guises including die sink, wire and 'pseudo grinding'.
Alternatively, units such as the Kern HSPC with a spindle speed of 160,000rpm epitomise the 'top end' machines on offer for producing complex micro features and components with a precision of ±0.001mm.
The extent of tooling available is similarly comprehensive, with a wide variety of coated carbides and advanced ceramic materials able to cope with the full spectrum of workpiece materials.
The range of applications for nonsilicon based micro-components is growing daily. The medical area is potentially huge with tiny moulded parts such as inner ear implants, drug delivery systems, artificial hearts and surgical tooling. Other applications include electronic and automotive parts and aerospace systems involving miniature power and cooling units for unmanned aerial vehicles, such as spy planes.






