Hyundai Horizontal Machining Center

Hyundai WIA announces the all new KH630 horizontal machining center developed for heavy-duty machining operations. The KH630 features a traveling Z-axis column, which is engineered to provide increased rigidity, reduced heat generation, and long-term accuracy and repeatability even under the highest levels of material removal. The KH630 also comes standard with a hydraulically driven twin-pallet automatic pallet changing system making it ideal for high production environment.

Bed and Column
The bed, column, and saddle of Hyundai WIA’s KH Series of HMCs are designed using finite element analysis to ensure powerful cutting and agility and are composed of meehanite cast iron to minimize deformation when performing heavy-duty cuts. The rigid bed is designed to absorb vibration for stable machining. In order to eliminate thermal growth during machining, all axes are driven by high precision double-nut ball screws. The double pretension design provides outstanding positioning and repeatability with virtually no thermal growth. All ball screws are connected directly to the servo drive motors without gears or belts, eliminating backlash.Using hardened and groud boxed guide ways in all three axes achieves rapid high speed axis movement. This reduces non-cutting time and decreases machining time for greater productivity.

X-axis and Z-axis
Hyundai WIA KH horizontal machining centers have more rigidity, as they are designed and manufactured from a single casting. The double wall structure of the column is designed to prevent thermal transformation, proving excellence in cutting performance and accuracy. The ‘T’ structure of the bed is designed with ample bed height and casting thickness to ensure a high level of rigidity. By adapting “semi-rising sliding ways” the load on the Z-axis slide way is decreased, enhancing the Z-axis ability to hold tolerance and repeatability over longer cycle times. The Y-axis guide way has been developed using a unique design by Hyundai WIA. This new method allows cutting forces generated by the spindle head to be absorbed by the Y-axis box ways which improve heavy cutting, long-term high accuracy, and superior surface finishes.

Main spindle
The KH630 can be configured with a 4,500rpm spindle for taking deep cuts, or with an 8,000rpm spindle for high speed precision applications. Ultra precision cylindrical roller-bearings provides fast accel/decel of the main spindle. The main spindle delivers minimal noise and vibration even at the highest cutting speeds, guaranteeing stable machining and minimizing thermal transmission to the main spindle. A hydraulic tool lock system increases machining stability.

The standard Big Plus spindle system provides dual contact between the spindle face and the flange face of the tool holder. This greatly increase tool rigidity, reduces run out and adds significant productivity to any machining applications. Spindle motor is 35hp with spindle torque rated at 1071/90nm.  The Big Plus spindle offers users the fastest possible material removal rates, highest accuracy and excellent rigidity. It guarantees stability when run at high spindle speeds for high rpm precision machining. The KH630 is designed with a two-step gear drive, providing both high spindle speed and high low end torque.

Optional Thru Spindle Coolant
To make the KH Series a true performer, Hyundai WIA provides optional thru spindle coolant. This feature is particularly useful for deep-hole drilling where it’s necessary to keep chip flow clear of the cutting surface. Thru Spindle Coolant also helps to increase tool life and decrease cycle time. Spindle temperature can be controlled by a spindle oil chiller which ensures constant oil temperature and minimizes spindle growth due to heat distortion. Cutting fluid is precisely delivered to the tool at all times by eight adjustable coolant nozzles.

ATC and Magazine
Hyundai WIA’s KH630 is outfitted with 40-tool, side mount swing arm type tool changer. This technology offers optimal performance with impressive tool change times of 5.5 seconds tool-to-tool. With a capacity of 40 tools (plus one in the spindle) setup time is reduced and run times can be made longer, especially if loaded with redundant tools. The ATC can be slowed down to accommodate a heavy tool ensuring smooth operation. Tool holders are automatically cleaned by an air blow and brush as they are placed in the standby position.

The 40 tool swing arm automatic tool changer and magazine are separated by a shutter system which closes during machining, thus keeping chips and fluids clear of the ATC and magazine.  When a tool change is required, machining stops, the shutter opens, the ATC exchanges old tool for new, the shutter door then closes and machining begins again. 

APC & Table
Accurate pallet positioning is achieved by using four precision ground tapered cones. The table is hydraulically clamped in position by a large diameter curvic coupling allowing for increased machining capabilities. During the pallet change cycle, strong blasts of air are discharged from the taper cones on the machine table to remove any chips and provide a clean surface for locating the pallet. This ensures high repeatability of the pallet location and guarantees optimum rigidity. A control panel has been added to the APC for operator convenience.  The APC change time has been improved by 18% compared to other manufacturers, and the table rotation has been decreased by 42%.
Control
The all new KH Series of HMCs is easy to program and operate with its start-of-the-art  Fanuc 31i-A Series CNC control featuring a 10.4” color LCD with Manual Guide i. As the industry’s most popular control, Fanuc offers compatibility and superior reliability. The new KH Series from Hyundai WIA is ideal for medium to large sized job shops, yet capable enough to handle high production environments that run 24/7.