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Fukudaco Hydrostatic Rotary Table / B-Axis Table

Manufacturer: Fukudaco

Overview

Hyprostatik, leveraging its proprietary hydrostatic technology, designs and manufactures linear guides, lead screws, rotary tables, and spindles as complete units. By using a specialized throttling valve (PM controller) in the hydrostatic system, they achieve characteristics that are unattainable elsewhere.

Applications

  • Rotary Table
  • B-Axis Rotation

Features

  • High rotational accuracy
  • Improved surface roughness
  • High rigidity
  • Equipped with a dedicated hydraulic unit
  • Customizable

Advantages of Hydrostatic Rotary Tables over Spindles with Rolling Bearings

  • No Wear: Hydrostatic bearings do not wear, ensuring consistent performance over long periods of use.
  • High Runout and Rotational Accuracy: Ensures superior precision in both runout and rotation.
  • High Static and Dynamic Rigidity: Offers excellent radial and axial rigidity.
  • High Damping: Superior damping characteristics reduce vibrations.
  • Low Friction: Achieved through a proprietary throttling valve and optimized design via computer algorithms.
  • Minimized Thermal Displacement: Cooling of the oil and thermal insulation between the motor and bearings minimizes thermal displacement.
  • Optimal Balance Accuracy: Ensures precise balance for high-performance applications.

PM Controller

The PM Controller is a specialized throttling valve developed exclusively by Hyprostatik for use in hydrostatic bearings.

Throttling valves for hydrostatic bearings often use various methods, with the capillary tube method being the most commonly employed. However, using the PM Controller instead of the capillary tube method achieves the following characteristics.

Advantages of Hyprostatik Hydrostatic Rotary Tables with PM Controller

  • Superior Runout Accuracy ➣ Ensures exceptional workpiece cylindricity and flatness.
  • No Wear ➣ Infinite lifespan and near-permanent maintenance of machine quality.
  • High Damping and No Vibration ➣ Enhances surface roughness of the workpiece.
  • Zero Friction and Stick-Slip at Low Speeds ➣ Positioning relies solely on the encoder system.

Specification example:

Size designation Ø200 Ø300 Ø440 Ø600 Ø800 Ø990
Table diameter [Ømm] 200-300 300-450 440-580 600-750 800-1300 990-2000
Axial load capacity at 4.0MPa ↓ (1) [N] 4,000 15,000 40,000 80,000 200,000 400,000
Radial load capacity at 4.0MPa (1) [N] 1,000 2,000 5,000 8,000 20,000 30,000
Tilting torque at 4.0MPa [Nm] 150 250 2,000 4,000 8,000 12,000
Axial gap stiffness [N/µm] 4,000 6,000 8,000 12,000 18,000 24,000
Radial gap stiffness [N/µm] 600 1,500 3,000 4,000 5,000 6,000
Tilt Gap Stiffness [kNm/mrad] 3 20 130 270 540 900
Rotational speed of oil viscosity VG68 (3) [min -1 ] 250 120 100 70 40 20
Flow rate of oil viscosity VG68 (2) [l/min] 0.5 0.8 2.0 2.3 1.8 2.8
Oil viscosity VG32 rotation speed (3) [min -1 ] 500 300 200 130 90 50
Flow rate of oil viscosity VG32 (2) [l/min] 0.8 1.9 3.1 3.8 4.0 6.5
Oil viscosity VG15 rotation speed (3) [min -1 ] 1000 600 400 300 200 100
Flow rate of oil viscosity VG15 (2) [l/min] 1.8 3.8 6.7 8.3 7.4 13
Runout accuracy during rotation (4)
(radial/axial) [µm]
0.15 0.15 0.20 0.25 0.30 0.30

(1) Load capacity can be increased by increasing pressure, and speed can be increased by increasing flow rate and decreasing viscosity.
(2) Flow rate is when oil temperature is 30°C.
(3) Maximum speed is when oil heats up to 13°K. Speed ​​can be increased by increasing the flow rate.
(4) Under light load and no table deformation.
(5) Values ​​can be adjusted depending on the application.

B-axis rotary table (swivel unit)

Features

  • The entire swivel axis is supported by hydrostatic bearings and seals
  • Equipped with a torque motor
  • Includes a high-precision angular measurement encoder
  • High-precision axial clamping when stopped
  • Compatible with both vertical and horizontal axes

Production Examples

z
Axial load capacity at 3.2MPa [N] 13,000 20,000
Tilting torque at 3.2MPa [Nm] 1,200 2,200
Axial load capacity at 5.0MPa [N] 20,000 30,000
Tilting torque at 5.0MPa [Nm] 2,000 3,000
Radial load capacity at 3.2MPa [N] 1,500 3,000
Radial load capacity at 5.0MPa [N] 3,000 5,000
Maximum rotation speed [°/sec] 360 360
Oil Viscosity VG68, VG46, VG32 VG68, VG46, VG32
Maximum oil flow rate for VG46 @ 35°C at 3.2MPa [L/min] 1.5 2.3
Maximum oil flow rate for VG46 @ 35°C at 5.0MPa [L/min] 2.2 3.0
Maximum torque of torque motor [Nm] 350 647
Maximum torque motor current [A] 31 31
Absolute Encoder Heidenhain RCN5580 Heidenhain RCN8580

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