Bending Apparatus

1. Basic Understanding of Equipment

1.1 Key Parameters

Parameters	Note
Nominal Diameter of the Sample Conduit	16, 20, 25 mm
Inner Bend Radius	96120, 150 mm
Outer Radius of Bend	113141, 178 mm
Groove Radius of Forming Dies and Bending Rolls	8.1, 10.1, 12.6 mm

This device is designed for specialized testing of the mechanical properties of metal and composite cable conduits.

It is primarily used in electrical appliance quality inspection laboratories, the quality control departments of cable and conduit manufacturers, third-party testing organizations, and for import and export product inspections.

1.2 Applicable Standards

In strict accordance with clauses 10.4.101 and10.4.103, and Figure 103 (IEC 61386-21:2021, clauses 10.4.101 and 10.4.103, Figure 101), and subjected to testing.

1.3 Downloading Electronic Documents

We have already sent you the download links for the electronic user manual, calibration certificate, warranty card, and other documents via email at the time of shipment. Please download them as soon as possible. If you have not received the email, please contact us to request the download links again.

2. Precautions for Use

2.1 Operational Environment Safety Requirements

Operating environment temperature: 15°C to 35°C; relative humidity: 45% to 75%; no condensation, no corrosive gases, and no airborne dust.

Place the device on a level, stable workbench with at least 30 cm of clearance on all sides, away from sources of vibration.

2.2 Safety Guidelines for Operational Procedures

During testing, do not reach into the test area with your hands or any other part of your body to prevent crush injuries.

The specimen must be securely fastened to prevent it from falling or ejecting during loading, which could pose a safety hazard.

3. Introduction to the Test Setup

3.1 Standard Diagram

See Figure 3-1 (taken from the IEC standard).

Figure 3-1

3.2 Product Photos

See Figure 3-2.

Number	Note
①	Specimen mounting holes, sizes include 16, 20, and 25 mm
②	Molding Die
③	Curved Rollers
④	Curved roller handle: Slide the handle down to bend the installed conduit.

Figure 3-2

4. Catheter Bending Test

4.1 Test Execution

Metal tubes with diameters of 16, 20, and 25 were subjected to bending tests using the LS-B51M machine.

A test specimen with a length of 30 times the nominal diameter is subjected to a bending test; when the test fixture is released, the specimen bends to an angle of (90 ± 5)°, resulting in an inner radius of curvature equal to 6 times the nominal diameter.

For pipes with welds, conduct this test on six specimens: three specimens with the weld on the outer side of the bend and three specimens with the weld on the inner side of the bend.

4.2 Evaluation of Test Results

After testing: Neither the catheter material itself nor the catheter’s protective coating shall exhibit any cracks visible to the naked eye or with corrected vision without additional magnification; if there are welds, they shall not crack; and the catheter’s cross-section shall not be excessively deformed.

Deformation of the cross-section shall be checked by the following tests:

The bent conduit shall be positioned for testing as follows: the straight section shall be at a 45° angle to the plumb line, with one end of the specimen facing upward and the other facing downward, such that the corresponding gauge shown in Figure 4-1 (taken from the IEC standard) can pass through the conduit under its own weight and without any initial velocity.

Figure 4-1

5. Post-Test Procedures

5.1 Device Reset

Outside of test periods, specimens must not be mounted on the test apparatus to prevent the application of force when testing is not in progress.

5.2 Sample Preparation

Separate the test specimens that passed and those that failed, label them appropriately, and avoid mixing them up.

5.3 Cleaning and Tidying Up the Test Site

Wipe dust and debris from the surface of the device with a lint-free, soft cloth; do not rinse the equipment directly with water.

Organize the tools on the workbench, arrange them neatly, and clean up any debris left over from the experiment.

6. Routine Maintenance and Care

6.1 Regular Maintenance

Every three months, apply a small amount of neutral grease to the bending roll shafts to prevent rust and seizing; apply rust-preventative oil to the forming dies and bending rolls to prevent rust.

6.2 Long-Term Storage and Maintenance

After routine maintenance is complete, cover the entire unit with a dust cover and store it in a dry, well-ventilated warehouse.

6.3 Calibration Interval Requirements

To ensure the accuracy and reliability of the device, it is recommended that it be sent periodically to a qualified third-party metrology institution for calibration. The recommended calibration interval is 12 months. Users may determine the specific calibration interval based on usage frequency, environmental conditions, and quality system requirements.

7. Troubleshooting and Resolving Common Problems

Fault Symptoms	Possible Causes	Procedure
Jamming of the Curved Roller	Dust buildup, insufficient lubrication, foreign objects lodged in the mechanism	Try again after removing dust, replenishing lubricant, and clearing any foreign objects from the gaps.