Doosan Infracore Machine Tools has introduced the HC 400 II. According to the company, it delivers high speed, high precision and high productivity in a compact platform designed for manufacturing facilities with limited space. Its versatile 12,000 RPM spindle motor is engineered for a wide range of machining applications. Additional highlights include an integrated rotary pallet changer and advanced technological features.
The bed is a rigid, one-piece casting made from fine grain Meehanite cast iron that is used for its excellent dampening and vibration absorbing characteristics. "It is heavily ribbed in order to withstand deformation under heavy cutting loads," said a company spokesperson. "The rigid, box-type column casting is also heavily ribbed to prevent twisting or distortion under stressful machining processes. Massive guideways support the column for maximum rigidity. The saddle is fully supported for the full length of travel with no overhang for enhanced precision."
The HC 400 comes standard with a rotary shuttle type automatic pallet changer (APC). The APC is rigidly built and has a large working area able to accommodate workpieces up to 600 mm (23.6") diameter x 800 mm (31.5") high (with no hydraulic interface installed). Qualified edge locators are included to aid in fixture or tombstone set-up. The pallet is located by four tapered conical pins and then locked into place by pull studs for precision and rigidity. The standard, 1° indexing table is locked into place by a hydraulic actuated curvic coupling for increased strength. The optional, 360,000 position B-axis table is locked into place by a hydraulic actuated brake. The pallet not engaged in the machining area can be manually rotated and locked down every 90° to aid in part or fixture set-up while the machine is in operation. According to the company, this feature aids in achieving maximum machine uptime with little to no time lost during changeover. Pallet change time including lock, unlock and rotation is 8 seconds.
"All axes are of a roller linear motion guide type for higher stiffness, accuracy and surface finish than more common ball bearing guide types," said the spokesperson. They are both heavy duty (X - 45 mm / 1.772", Y - 45 mm / 1.772", Z - 45 mm / 1.772") and widely spaced (X - 550 mm / 21.6535", Y - 570 mm / 22.441", Z - 400 mm / 15.748"). "Roller guide ways are three times more rigid with two times more life than ball bearing guide ways and provide for optimal weight and force distribution," continued the spokesperson.
Each axis is driven by a high precision, double nut ball screw, which is supported on both ends by angular contact thrust bearings. "This double pretension design provides enhanced positioning repeatability with virtually no thermal growth," said the spokesperson. These large diameter ball screws (X - 40 mm / 1.57", Y - 40 mm / 1.57", Z - 40 mm / 1.57") are directly connected to oversize A.C. servo drive motors without gears or belts to help eliminate backlash.
According to the company, the high speed, direct drive spindle system is a true cartridge type unit supported by high precision ceramic ball bearings that offer minimized vibration and thermal growth. The bearings are precision class P4 (AFBMA-B7) and are permanently grease lubricated. The versatile 12,000 RPM, 11 / 18.5 kW (15 / 25 HP) motor has 117 nm (86 ft-lbs.) of torque. The CAT 40 Big Plus spindle also features rigid tapping, further increasing productivity.
The Big Plus spindle system and tooling provide simultaneous taper and flange contact between the machine spindle and toolholder as well as complete interchangeability with existing machines and tools. Upon mounting the toolholder into the machine spindle, contact occurs prior to clamping. Due to the retention force, the taper of the toolholder expands the machine spindle in its elastic range. The tool is pulled further in until the tool flange touches the spindle face for improved rigidity.
Air is supplied to the back of the pull stud and then forced through the tool using the same technique as through spindle coolant by use of M-code. The spindle air blow is commonly used on pre-hardened steel, die and mold cutting, cutting of plastics and any time coolant would contaminate the workpiece, such as during the machining of certain medical components.
Machine accuracy is maintained by using a refrigeration system that circulates cooled oil around the spindle, thereby reducing the thermal effects of any heat generated by the machining processes.
The 60 tool double arm ATC provides a tool to tool time of 1.5 seconds. The tool changer design utilizes random access in order to deliver instant tool availability, even during short cutting cycles. All tools are returned to the pots from which they were originally taken so that collision problems involving large-sized tools need to be considered only once when they are first mounted.
The machine features a 20 bar (230 PSI) through spindle coolant system (TSC). A dedicated positive displacement pump delivers the coolant directly to the tool tip, which allows more aggressive feeds and speeds. There is also no need to stop and adjust coolant nozzles. Protecting the spindle and the vital rotary union from contamination is a cyclonic filter, which does not require the use of bags. The 550 liter (145 gallon) tank stores an ample supply of coolant and is isolated from the machine bed to help prevent heat transfer.
The bed guideways are protected by a heavy gauge telescopic cover, which is inclined at a 30° angle to help direct chips down into the trough. Dual screw-type augers then move the chips to the rear of the machine where they can be removed or taken away by an optional chip conveyor. A separate pump provides flood coolant at spindle face through adjustable spindle mounted nozzles.
"Doosan's newly designed Automatic Pallet Changer (5 APC) system is an easy to retrofit and compact way to boost the productivity of an HC 400 II HMC," said the spokesperson. "Featuring operator access doors at three stations, parts can be loaded and unloaded with no loss of time between machining cycles. With the ability to run either separate part programs per pallet or the same part number on all of the pallets, the 5 APC can be configured the way customers need it."
Doosan's LPS II Compact Pallet System is an easily retrofitted linear pallet system. With 12 pallets available on demand, the LPS II compact enables users to queue up multiple jobs and call them up as needed, increasing throughput and maximizing work flow. It is suited to manufacturers who produce a family of parts with rapidly changing production schedules.
For more information contact:
Dave Barber
General Manager of Marketing
Doosan Infracore Machine Tools
19A Chapin Road
Pine Brook, NJ 07058
973-618-2500
dbarber@doosan.com
www.doosanmachinetoolsusa.com
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AmTTech
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303-466-3777
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Adams Machinery
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480-968-3711
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