GV-780 - High Speed Vertical Turning Center

Ultra Performance Vertical Turning Center

Packed with the latest machine tools technology and high precision turning capabilities, the Yama Seiki GV-780 series ultra performance vertical CNC turning center combines a high rigidity structure and precision linear guideways with a servo indexing turret and powerful spindle ( max. torque up to 1,050 Nm ). These series features a compact machine size with heavy duty turning capabilities. The optional live tooling turret, C-axis, dual-face turning holders and workpiece balancing analyzer allows the GV-780 series to be able to complete turning, milling, drilling, tapping, dual-face machining and workpiece balancing analyzing in one single machine.

Spacious machining range with advanced multi-tasking capabilities can meet the needs of all sorts of machining applications.

The rear end type chip conveyor provides excellent chip removal efficiency while increasing floor space usage.

The optional self developed G.LINC 350 intelligent control system reduces man power while increasing production efficiency.*1

Workpiece balancing analyzing ( Opt. )

*1 Please contact Yama Seiki sales for further information.

High Rigidy Structure

By using Finite Element Methods ( FEM ), optimal reinforced ribbings are directly casted into the one-piece bed and column structure. Mechanical rigidity has been increased by 30% when compared to conventional designs. The GV-780 series is capable of performing heavy-duty turning and maintain long-term high-precision accuracy. More rigidity also means extended tool life.

The servo motor of each axis feed system uses FANUC αi series components to ensure peak machining performance and accuracy.

X & Z axes uses high rigidity roller linear guideways which provides rigidity for heavy cutting and fast movement low abrasion advantages. The rigidity and controllability are greatly increased.

Contact surfaces on the bed and column are precision hand scraped to provide maximum assembly accuracy, structural rigidity and load distribution.

Extra wide slant surface chip disposal design allows easy chip removal, preventing the heat from influencing machining accuracy.

Built to withstand years and years of rigorous high production turning, the heavily ribbed, one-piece thermally balanced bed and column casting components are of " MEEHANITE " casting.

( Casting structute of GV-780 series model shown. )

Ultimate Turning Power

P4 grade double row roller bearings and angular ball bearings are directly assembled for maximum level of support and precision. Bearing configuration is designed for super heavy-duty cutting with ultra-smooth performance and long term durability with a higher level of accuracy.

The A/C, constant output, wide-range FANUC αP40/6000i series motor can generate twice the torque output of standard motors. This double bind motor is designed to reach full output at 1/2 the RPM of standard motors, providing the ability to take heavier cuts in the lower RPM ranges.

Maximum horse power can reach up to 22 kW ( 30 min. ) which provides heavy cutting capabilities.

Advanced Turret Technology

The super heavy-duty servo indexing turret features the latest non-lifting turret disk technology, achieving 0.2 second indexing for adjacent stations and 0.5 second for stations at the opposite end of the disk.

The Japanese super high precision curvic couplings accurately position the turret disk and 3,620 kg ( 7,240 lb ) of clamping force ensures abundant turret rigidity for all cutting conditions.

The curvic couplings features auto-centering, auto-cleaning and a large size tooth flank which are superior to traditional curvic couplings and are greatly used in our products.

Live tooling turret and C-axis control capabilities on the GV-780 series allows the machine to perform multi-tasks on a work piece, such as turning, milling, drilling and tapping. This eliminates manpower and cycle time, while reducing accuracy lost, which will occur if the part is moved from machine to machine.

Each station of the live tooling turret can be equipped with live tooling ( live tooling tools rotate in working position only ) and features a non-lifting turret disk.

Yama Seiki’s live tooling turret utilizes advanced servo indexing technology to achieve 0.2 second indexing for adjacent stations and 0.5 second for stations at the opposite end of the disk.

Dual-face Turning Holder

The Yama Seiki dual-face turning holder allows both sides of a work piece to be machined at the same time while ensuring parallel precision of the surface, which is applicable for disk brakes or automotive related components.

The cutting time is 50% shorter than when using regular tools.

The servo motor driven dual face tool holder provides more flexibility to various working conditions, overcoming hydraulic driven disadvantages, thus, saving tool adjustment time and increasing production efficiency.

Work-piece Balancing Analyzer ( WBA )

Increasing productive efficiency and streamlining operations have always been Yama Seiki's research and development concept. The Yama Seiki Work-piece Balancing Analyzer ( WBA ) is based on the developing foundation of our multi-tasking turning centers and University - Industry Cooperation. And now we combine them together to accomplish for a higher level of efficiency and streamlining.

The WBA is mainly applied to "Dissymmertical parts" and "workpiecs that needed to be balanced after machining" . The sensor installed inside the machine can pick up the vibration signal caused by the centrifugal force under high speed rotation from the work-piece. For dissymmertical parts, the machine is able detect the unbalanced position and weight and provide information for the user to design the appropriate tooling. For work-pieces that needed to be balanced after machining, by using our multi-tasking turning centers ( more than 3 axes machines ), the unbalanced position and weight can be detected online and be eliminated by the live tooling turret during the machining.

Before WBA correction

After WBA correction

Vibration

⇓ 88%

Take disk brake as an example, most companies use offline balancing analyzer method, which the machine needs to be stopped after the disk is finished, then move to the balancing analyzer for detection. When the detection is done, then move the disk to a machining center to eliminate the unbalance amount. It costs unwanted time by just loading and unloading the disk from one place to another, it can also cause accuracy error.

Therefore, we created the concept of installing the WBA into the vertical multi-tasking turning center. When the disk brake is finished, it can be evaluated online, then use C-axis to eliminate the unbalanced amount. This can save lots of loading and unloading time and also prevent accuracy error from the process. With the combination of the WBA and multi-tasking turning procedure, we can bring multi-tasking advantages into the next level.

Cycle time ⇓ 50%

The interface of the WBA can be customized based on customer's needs, which is easy to use. Take disk as an example, the standard work-piece only takes 2 minutes to setup. First insert the disk data, then insert machining parameters. After the setup is done, it only needs one button to begin the entire procedure ( turning, detecting, milling ) which the cycle time is only 3 ~ 4 minutes.

Insert disk data

Insert machining parameters

WBA displayed in G.LINC 350 ( Opt. )

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