HMC achieves 4 micron precision and accuracy.
December 22, 2008 -
Providing X,Y,Z travels of 1,200 x 950 x 1,200 mm, SPC 7120 SIP features variable AC 50 kW main drive motor that delivers speeds up to 10,000 rpm. Working feed rates are 40 m/min, while rapid traverse rates are 40 m/min in all 3 axes. During power milling C 45 steel, cutting volumes of 1,800 cm³/min are routine. Direct drive NC rotary table and absolute angle measurement system present optimal conditions for multi-sided machining. Spindle taper is HSK-A 100 or ISO 50, BT 50, or CAT 50.
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Original Press release
StarragHeckert Inc.,
Skyport Business Park
Hebron, KY, 41048
USA
IMTS is Global Premiere of New SPC 7120 HMC from SIP
The SPC (Super Precision Center) 7120 SIP horizontal machining center (HMC)
features a compact design, highly productive tool and workpiece handling and is
ideally suited for a broad spectrum of production applications - while routinely
achieving 4µ precision and accuracy. The new SPC 7120 SIP features hand scraping of critical contact surfaces (guideways, etc.) for absolute smooth, accurate and repeatable operation and long life, as well as complete temperature control through thermo-symmetrical configuration and isolation and expansion compensation of the machine's crucial components (main subassemblies, machine bed, table and stands).
Copyright ZF Luftfahrtechnik GmbH
The SPC 7120 SIP is equipped with a horizontal spindle and offers flexibility, the high degree of modification and far-reaching options ensure
complete customer satisfaction.
The SPC 7120 SIP's horizontal main spindle provides the muscle for maximum cutting power. The variable AC 50 kW main drive motor delivers speeds up to 10,000 rpm (optional). During power milling C 45 steel, cutting volumes of 1,800 cm3/min are routine. Spindle taper is HSK-A 100 or ISO 50, BT 50 or CAT 50.The tools are hydraulically released and chucked via a plate spring package.
The compact, bending and torsion resistant horizontal main spindle, with four high precision bearings and low maintenance grease lubrication, guarantees high speed, quiet running and consistent accuracy. Standard features include cleaning of the spindle cone during tool changes by compressed air, blowing out the inner coolant feed line of the tools and the electronic alignment of the spindles for oriented spindle holding. Direct path measurement systems are used to measure the absolute length of all linear axes. Encapsulated and charged with compressed air, the measurement systems are safely protected against contaminants.
The SPC 1720 SIP's travel values are 1,200 mm in X, 950 mm in Y and 1,200 mm in Z. Working feed rates are 40 m/min (X, Y and Z), while rapid traverse rates are 40 m/min in all three axes. Rapid traverse rate of the B-axis is 25 U/min. Acceleration rates are 6.5 m/sec2 in X and Y and 3.5 m/sec2 in the Z-axis. Accuracy of linear axes: positioning deviation of <0.004 mm; repeatability of <0.002 mm and maximum backlash width Umax of <0.001 mm.
Wet machining is performed with maximum coolant flow of 30 l/min. In the SPC 7120 SIP, coolant is fed through adjustable conical nozzles or through the center of the spindle and tool - max. 80 bar, programmable. Adapted to the material being machined, the coolant supply unit is equipped with a back flushing filter, a nonwoven gravity filter or vacuum rotary filter. Options include coolant temperature control, emission evacuation and fire safety devices (for machining magnesium, for example). The 750 mm wide chip conveyor arranged centrally beneath the machine bed assures maximum volume chip discharge, while providing the best conditions for dry working.
The SPC 7120 SIP's direct drive NC rotary table and absolute angle measurement system present ideal conditions for the multi-sided machining. Feeding precision of 0.0001°, and rotational speeds of 25 rpm are standard. Automatic adjustment of acceleration of the circular axis based on workpiece mass is available as an option. The two advancing drives for workpiece pallets correspond perfectly to the requirements of the weight of heavy pallet loads and the dynamics of adjusting to movement. Workpiece pallets up to 630 x 800 mm2 can be equipped with a quick-coupling unit which handles clamping pressures up to 240 bar. Maximum pallet load is 1,500 kg.
Workpieces are loaded and unloaded on the clamping plate while machining proceeds uninterrupted. The rotary design of the clamping site, with 4 x 90° indexing, substantially facilitates work setup. A hydraulic stroke/swiveling device changes the pallets from mounting site to work site. Pallet change takes 25 sec.
The SPC 7120 SIP's automatic tool changer (ATC) is optimally designed for reducing non-productive idle times. Tool changes between chain magazine and main spindle take 8 sec., chip-to-chip. The chain magazine has 60 (80 optional) tool pockets for tools up to 325 mm in diameter, 600 mm in length, and individual tools weigh 25 kg. With tool lengths to 600 mm, inaccurate and time-consuming reverse boring is dispensed with. For higher tool requirements, SPC 7120 SIP HMCs are equipped with tower magazines for 180, 240 and 320 tools. Tower magazines have room for tools to 600 mm in length and 325 mm in diameter.
The SPC 7120 SIP is equipped with the Sinumerik 840 D (Fanuc 31i optional) control. The CNC control in combination with integrated PLC and the digital SIMODRIVE 611 D assures highest productivity, machining accuracy and process stability.
End
For more information, contact StarragHeckert Inc., Skyport Business Park, 2379 Progress Drive, Hebron, KY 41048 USA. (859)534-5201 (v), (859) 534-5212 (f), ussales@starragheckert.com
SIP is pleased to introduce a new high precision machining center at IMTS: the Super Precision Center (SPC) 7120 SIP is a high precision CNC HMC configured for 4 axis machining. The first of its kind, the SPC 7120 SIP combines the proven production know how of StarragHeckert with unique manufacturing techniques only available from SIP Switzerland. The result is a highly productive, 4µ machine tool designed for challenging production applications.
Societe d'Instruments de Precision SA, Geneva, Switzerland
The name SIP is synonymous with the highest technical precision in manufacturing technology. Anywhere, anytime where quality and precision cannot be compromised, SIP machines are in operation.
The SIP product range features horizontal and vertical ultra-high precision machines in 3-, 4- and 5-axis models. Thus, SIP offers an optimal solution for every technical challenge for which even a 1 micron is crucial. SIP proudly enjoys leadership recognition by the aerospace industry, the precision machine industry, tool and mould manufacturing as well as the prototyping of high performance motors.
While construction attributes and special machine components certainly contribute to the extraordinary accuracy and repeatability of SIP technology, the proficiency of our Swiss staff is a rare and unique factor. All critical surfaces are hand scraped, thus ensuring a life span of perfect geometry and an investment that pays off, maintaining -and increasing - its value over decades.
StarragHeckert additionally has been for years an industry leader in the machining of titanium and nickel-based alloys, in particular Inconel, monel, nimonic and Hastealloy. In conjunction with metallurgists and metals scientists, StarragHeckert SIP has taken the lead in machinability studies of these not-so-common metals, alloys and super alloys. As a result, StarragHeckert has been selected by the government of China to be the officially preferred supplier of milling technology.
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