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September 2021

Machining large parts without reclamping: MMV 4200 / ...

Machining large parts without reclamping: MMV 4200 / 5200 / 6200 travelling column machining centres

With the MMV 4200 / 5200 / 6200 models, EMCO introduces an extension to its MMV series, featuring enlarged travel paths (X= 4200 / 5200 / 6200 mm) in response to increased demand in the travelling column machine segment.

The machines with 3, 4 and 5 axes can be used for complete machining of very large and heavy parts in one clamping. The proven technology MMV 3200 has been kept in the new models: a highperformance motor spindle with 0 - 15,000 rpm speed range, 46 kW spindle power and up to 170 Nm torque. 40 tool pockets available as standard, optionally expandable up to 120 pockets. Thanks to the new modular system, customers do not have to choose between a smaller machine or one that is too large; variable sizes are possible up to 6,200 mm. The main difference between the MMV 4200 / 5200 and 6200 and the previous model is the X-axis drive, which uses a rack-and-pinion system instead of ball screws. This ensures dynamic, fast and precise feed during machining. The demand for these high-performance machines comes mainly from the petroleum industry, railroad industry and intralogistics.
Highlights
The extremely compact machine bed of the travelling column machining centres is a heat-treated, welded steel structure that provides a torsion-resistant and stable base for all components and machining operations. The production of large and heavy workpieces up to 8,000 kg is enabled by a powerful motor spindle with 46 kW spindle power, a torque of up to 170 Nm and a spindle speed of up to 15,000 rpm (18,000 rpm HSK-A63). Both spindle versions are grease-lubricated. The new versions of the previous model support complete machining of very long and heavy workpieces without reclamping. A new modular system ensures a variable choice of workpiece sizes up to 6,200 mm during machining. The large work area doors ensure easy loading and unloading of workpieces and fixtures, even when using a crane. As standard, the machines have 40 stationary tool pockets; these can be increased to up to 120 tool pockets (also optionally alongside column) on request. The MMV 4200/5200 and 6200 feature a rack-and-pinion Xaxis drive system that ensures dynamic, fast and precise machining at all times, even with long travels. With this system, rapid traverses of up to 60 m/min can be achieved. The machine versions with swivel head (B axis) and rotary table (C axis) are ideally suited for 5-axis
simultaneous machining. Both the swivel head and the rotary table are driven by dynamic torque motors. The swivel head available in the standard versions has a range of up to ± 120° and a speed of 50 rpm, the rotary table n x 360° has a speed of up to 100 rpm. The rotary table with Ø 900 mm is designed for workpiece weights up to 2000 kg. All linear axes are already equipped with glass scales as standard. The dynamic linear axes and the torque drives of the rotary axis create ideal conditions for 5-axis simultaneous machining of complex workpieces. State-of-the-art digital control systems from Heidenhain (TNC 640 - 24" monitor*) or Siemens (840D sl - 22" monitor) ensure user-friendly machine operation. The ergonomic design of the MMV series with its movable control panel creates ideal working conditions for the operator, who can swivel and rotate the control panel in the working area as well as move it along the longitudinal axis without interrupting the machining process, while keeping the workpiece in view at all times.
(*Currently only on the new variants of the MMV, after the introduction of to the new design, the MMV 2000 and 3200 will also be equipped with the new monitor).
Options
The machining centres can be equipped with numerous options such as coolant filtering systems with high pressure pumps with up to 60 bar through the spindle, which permit the use of high-performance tools with internal cooling. All guides and rack drives are permanently grease-lubricated via a central lubrication system, while oil films are kept from forming in the coolant system. State-of-the-art touch probes allow automatic measurement of tools and workpieces. RF or laser touch probes are optionally available for this purpose. This reduces the setup time for tool changes and increases the quality of the workpiece. Thanks to the large working areas of the MMV series machines, it is possible to optionally add a partition wall for pendulum operation, a second integrated rotary table or and NC axis with counter bearing. Features such as the automatic door operation or thermal compensation of the milling spindle make the machining centres even more efficient.