Section 1: Principle of Liquid Expansion Clamping Device

Unlike conventional liquid expansion fixtures, the liquid expansion fixture utilizes static pressure expansion technology. After applying pressure to the fixture, the hydraulic medium generates a high pressure under the action of the pressure mechanism, forcing the deforming element to uniformly elastic deform in a 360° circumferential direction across the entire clamping range, thereby achieving tightness on the locating holes/axes of the workpiece.

Section II: Characteristics of Liquid Expansion Clamps

1. The fixture is filled with a liquid medium internally

2. The working surface of the fixture is elastic deformable.

3. Perform circular clamping on the workpiece, ensuring even pressure without deformation.

4. High clamping force, up to 100 MPa

5. Low workpiece deformation, high processing accuracy, and fixture dynamic accuracy less than 0.003mm.

6. Fast workpiece clamping and dismounting, high work efficiency.

7. Tailor-made based on equipment and workpieces, with strong adaptability.

8. The expansion is 0.3% of the clamping diameter.

9. Utilizing variable diameter coil springs, spline coil springs, and other accessories allows for the processing of various size and specification workpieces.

10. Achieve rapid changeover of workpieces and fixtures

Section 3: Structure and Types of Liquid Expansion Clamps

Lathe Applications

Section 4: Technical Parameters of Liquid Expansion Clamps

1. Application Range

The maximum allowable expansion of the liquid-filled clamp is not greater than 3% of the clamping diameter; generally, good clamping accuracy and service life can be achieved when the dimension tolerance of the clamped workpiece section is H7 or higher.

2. Pressure Control

Manually pressurized liquid expansion clamps are strongly recommended to use a torque wrench and apply pressure according to the recommended torque values; for clamps with automatic pressure on machine tools, pressure should also be applied according to the recommended machine force, tension, or hydraulic cylinder oil pressure.

3. Precision Testing

Jig precision should be measured against standard parts, and the accuracy should comply with the technical agreement between both parties.

4. Pressure Testing

The fixture failed to clamp standard parts within the recommended pressure range, indicating a failure of the liquid swelling fixture to clamp properly. Please contact the company's technician.

Section 5: Precautions for Using Liquid Expansion Clamps

① Pay attention to not overinflate the liquid-filled clamping fixture without workpieces or standard parts being held in place.

Apply rust preventive oil regularly and evenly; note that the rust prevention period is three years; especially do not forget the rust prevention treatment before and after use.

③Upon completion or during periodic use, ensure comprehensive dust protection to prevent any impact on subsequent use.

④ Suggest packaging the liquid expansion workwear in wooden crates and placing them in a dry, open area for storage.