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Starrag Heckert's new Super Precision Center

"A new standard is born" Super Precision Machining Center

The SPC (Super Precision Center) 7120 and 7140 SIP horizontal machining centers (HMC) feature a compact design, highly productive tool and workpiece handling and are ideally suited for a broad spectrum of production applications — while routinely achieving 4µ precision and accuracy (according to VDI/DGQ 3441). The SPC has selectable process adaption parameters automatically optimising machine performance depending on roughing, finishing and fine finishing operation requirements.

SPC SIPs in the precision machine industry, where each tolerance of a key part has an effect on the overall achievable accuracy of the complete machine system. Undoubtedly, the manufacturing challenges remain daunting. Requirements such as quick setup times, fast change over, part handling and rapid chip-to-chip times are increasingly critical in today's environment. It is evident that CPK requirements and the need for producing accurate parts are close companions. To this end, the SPC Series SIP meets the manufacturing requirements of the industry head on by utilizing the flexibility and features of our compact machine design enabling high precision that is essential for producing good parts consistently. The result is super precision parts produced efficiently with high throughput.

Today's aerospace companies are faced with the demands of machining exotic materials and hard-to-machine characteristics such as titanium and Inconel. These manufacturing challenges are further compounded when precision bores and dimensional shapes require machined tolerances in the single micron range. The SPC Series SIP is specifically built to meet these demanding applications. Our proven high precision machine design and "best in class" geometry works in tandem with the machine's high productivity features delivering substantial benefits. The result is for the first time highly accurate parts can be produced in volume at standards of super accuracy as yet unattainable within a production environment.

The new SPC Series SIPs feature hand scraping of critical contact surfaces (guideways, contact pads of ball screws, spindle and axis) providing absolute smooth, accurate and repeatable operation. Our specialists in Geneva ensure a state of the art mechanical geometry by scraping. Super precision is assured by utilising complete temperature control throughout. A thermo-symmetrical machine design with all heat sources isolated controls precision deviation. This maintains super precision of the complete machining system, the machine's crucial components (machine bed, column, spindle and rotary table) all operate at maximum stability. The SPC SIPs are equipped with horizontal spindles, along with a large chose of system options offering complete scope enabling the customer to specify a machine ideal for the most demanding of applications.

The new SPC SIP's high precision horizontal main spindle combined with automatic elongation control provides the power and precision for complete process performance. The variable AC 50 kW main drive motor delivers speeds up to 15,000 rpm, combined with the machines rigidity this provides the basis to remove metal at high rates, cutting C 45 steel at 1,800 cm3/min. The customer also has a choice of either HSK-A 100 and ISO 50 spindle tapers.

Linear measuring systems made of steel are used for axis position control. The precision class of the measuring scales is specified at +/- 2µ. The thermal expansion coefficient of the measuring scales are constant to the expansion and contraction rates of the machine.

The new SPC-Series SIP's direct drive NC rotary table with absolute angle measurement technology offers unparalleled levels of precision capability whilst machining complex features and multi-sided workpieces. Incremental precision of 0.0001° and rotational speeds of 25 rpm are standard. Automatic monitoring and adjustment of acceleration of the rotary axis based on workpiece mass is standard . Twin pallet automatic load / unload for increased productivity comes as standard with pallets up to 630 x 630 (800) mm ( SPC 7120 ) and 800 x 800 (1000) mm. (SPC 7140)

The SPC SIP's automatic tool changer (ATC) is optimally designed for reducing non-productive idle times. 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 28 kg. For higher tool requirements the SPC SIP can be equipped with tower magazines for 180, 240 and 320 tools.

Temperature control is maintained with a cooling system equipped with a differential temperature controller, this ensures super precision on the work piece throughout the machining process.

The SPC SIP is equipped with either the Siemens 840 D or Fanuc 31i CNC control system.

The SPC 7120 SIP's travel values are 1,200 mm in X, 950 mm in Y and 1,200 mm in Z. (7140: 1450 mm in X, 1100 mm in Y and 1300 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 3.5 m/sec2 in X, Y and Z axes. Accuracy of linear axes: positioning deviation of <0.004 mm; repeatability of <0.002 mm and maximum backlash width U max of <0.001 mm.

The names SIP and StarragHeckert are synonymous with precision and high production manufacturing. StarragHeckert and SIP machining centers are used worldwide in leading companies where productivity, quality, and precision are a must. To assist industry in helping meet these increasingly stringent requirements, StarragHeckert and SIP have combined the benefits of intelligent German engineering with the time honored Swiss precision of SIP. The result is the SPC Series SIP, an investment in perfection.

Press release issued by Starrag Group Holding AG on October 23, 2009


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Starrag Group Holding AG Milling, Cutting Tools


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