HMC offers long tool life, smoother surfaces

Claiming a level of technological integration never before realised, a horizontal machining center is able to deliver the longest tool life and smoothest machined surfaces.

Claiming a level of technological integration never before realised, a horizontal machining center is able to deliver the longest tool life and smoothest machined surfaces.

Mori Seiki's NH8000 DCG brings the advantages of DCG technology to large part machining.

The machine contains a level of technological integration never before realised in a horizontal machining center.

Every aspect of the machine's design was digitally analysed, resulting in a machine able to deliver the longest tool life and smoothest machined surfaces possible to date, as well as minimised non-cutting time.

In designing the NH8000 DCG, Mori Seiki tapped into a collected pool of 450 of the world's greatest engineering minds to attack an industry-wide problem - less than optimal part quality and machine performance due to machine vibration.

To do so, Mori Seiki created new technology: * Driven at the Center of Gravity (DCG) - the net driving force acts through the center of the axis.

The NH8000 DCG contains twin ballscrew drives on the X, Y, and Z axes that enable a significant reduction in vibration without sacrificing speed for accuracy.

* Force Loop Advanced Shape (FLASH) - the NH8000 DCG has been designed with a more stable platform that increases rigidity on all axes.

The design of the new NH8000 DCG allows machining forces to traverse across the box-in-box structure and through the bed, forming a closed loop, and resulting in a more stable platform.

* Minimum Moving Mass (M3) - through comprehensive digital analysis, the ideal mass was developed to improve accuracy and dynamic response, without compromising strength or vibration damping.

To further eliminate vibration during operation, the NH8000 DCG includes a tool magazine isolated from the body of the machine.

A 60-tool rack-type magazine is standard, with an option of 140, 240 or 330 tool capacities.

The rack magazine transports the tool directly to the ATC location, eliminating the need and cycle time for a tilting arm.

The tool-to-tool changing time is just 2.1 seconds.

The maximum tool length is 31.5in, the same as the pallet size, enabling the boring of parts that would otherwise require a 180 deg index to reach a hole of this depth.

The new horizontal machining center's work envelope has a diameter of 57.1in and height of 57.1in, and can handle a weight of up to 4,409 lb.

The NH8000 DCG features a 50-taper spindle with a maximum speed of 10,000 rev/min that can be reached in just 3.20 seconds.

During machining, the maximum rapid traverse rate of 1,969 in/min can be achieved with acceleration of 0.43G on the X-axis, 0.76G on the Y-axis and 0.41G on the Z-axis.

Mori Seiki also addressed chip evacuation and disposal as a means of boosting machine capacity.

The NH8000 DCG offers a unique center trough that enables placing the coolant tank on the floor underneath the spindle, conveniently simplifying routine maintenance tasks.

Nozzles flush the work area with coolant, allowing chips to drop to the center conveyor located directly below the machining area.

The extremely efficient design of the NH8000 DCG allows for excellent operation through extended unmanned operation.

In addition, the NH8000 DCG uses three-points to support the base casting on the floor, which enables the user to easily repeat the calibrations set by the manufacturer.

The advancements found in Mori Seiki's NH8000 DCG have given manufacturers cause to rethink the true potential of horizontal machining.

Mori Seiki produces extremely reliable machine tools and distributes worldwide.

The U.S.

headquarters is in Dallas with offices in Boston, Chicago, Cincinnati, Detroit, Los Angeles, and New Jersey, USA.

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