Related: Automotive Production
High precision, high quality and high reliability. Those were the three key areas engineers at Mori Seiki focused on when developing the X-Class of machines. The line-up includes computer numerical control (CNC) lathes, vertical and horizontal machining centers and integrated mill turn sys-tems. Here's part of how they did it:
- Machines have a robust design—thick beds, optimal location of the X- and Z-axis linear guide, large-diameter spindle bearings, powerful clamps on the tables and pallets.
- Machines utilize a heat-symmetrical structure that evenly disperses heat. Coolant circulation inside of castings minimizes thermal displacement. This helps preserve the tools and spindles.
- Systems use the MAPPS IV operating system, which integrates CAM software for the programming of complex workpieces. Additional functions—for things including set-up and maintenance—are readily accessible via the 19-in. control screen.
In addition to enhancing machine performance compared with the previous-generation N Series machines, Mori Seiki also dedicated itself to making the X-Class of machines more economical. For instance:
- Machines use LED lighting.
- Hydraulic units are equipped with accumulators, which help reduce running costs by powering down during standby.
- Certain models are equipped with fewer motors.
Here are some of the highlights from the X-Class:
NLX 2500 CNC Lathe
Spindle: 3,500-rpm two-axis turning spindle
Axis Travel: 10.2 x 31.3 in. (X, Z)
Rapid Traverse: 1,181.1-ipm
The NLX 2500 features a maximum turning diameter of 18.1 in. and turning length of 28.6 in. It can achieve 0.4 Âµm roundness and 1.1 Âµm Rz surface roughness. Its 10-station turret provides an indexing time of 0.41 seconds; it is positioned with an optimum center of gravity to improve tool tip rigidity by 27% compared with conventional machines. The machine also offers a more compact footprint (50.4 ftÂ²) than its predecessor (64.2 ftÂ²), making it 22% smaller. This helps it achieve a 13% power reduction.
NHX 4000 Horizontal Machining Center
Spindle: Standard models come with an 11-hp, 12,000-rpm spindle. Upgrade to a 15-hp, 20,000-rpm spindle is available.
Axis Travel: 22 x 22 x 26-in. (X, Y, Z)
Toolchange: Tool-to-tool, 0.9 seconds. Chip-to-chip, 2.8 seconds.
Z-axis travel from the spindle gauge plane is 2.8 in., a 1.2-in. increase over previous models. This allows for more rigid machining using a shorter tool. The machine is also equipped to handle workpieces up to 24.8-in. in diameter and 35.4 in. tall. Its ring-style 40-tool magazine handles tools up to 17.7 in. long. The machine utilizes fewer motors and has an accumulator-equipped hydraulic unit, which allows the machine to stop a hydraulic unit pump during standby. Along with LED lighting, an energy-efficient coolant pump and a fan cooler rather than an oil controller, it achieves a 40% energy savings compared to previous models.
NVX 5080 Vertical Machining Center
Spindle: Standard models offer an 11-hp, 12,000-rpm spindle. An optional 15-hp, 20,000-rpm upgrade is available.
Axis Travel: 31.5 x 20.9 x 20.1 in. (X, Y, Z)
Toolchange: Tool-to-tool, 1.3 seconds. Chip-to-chip, 2.96 seconds.
The NVX 5080 uses slideways for its axes, which offer improved vibration damping performance and rigidity compared to conventional vertical machining centers. This also facilitates longer tool life and enhances performance for heavy cutting operations. Power consumption is reduced by 35% compared to previous models by stopping the spindle, servo motors and the fans inside the control panel during standby.