Several Factors Affecting the Fatigue Life of Wire Rope

Release time:

2021-08-20

Failure forms such as fracture of wire rope during use not only bring serious economic losses to users, but also cause serious casualties. Therefore, we must improve the fatigue life of wire rope. The following Luoyang Baikte Technology Development Co., Ltd. tells you specific measures:

Several Factors Affecting the Fatigue Life of Wire Rope

1. raw materials and semi-finished products

1. It is required that the surface of the steel wire should not have obvious defects such as scratches, folds, flash and micro cracks.

The decarburized layer on the surface of the wire and steel wire is a very weak part of the strength, and its thickness is generally required not to exceed 1.5 of the diameter.

3, the requirements of raw materials (high-speed wire) after the completion of hot rolling control cooling, the gold phase tissue to sothite-based (volume fraction of 85%), the rest must be pearlite.

4. In order to ensure the corrosion resistance of the steel wire rope, the commonly used protection method of steel wire rope is galvanized, and the commonly used method is electroplating.

2. drawing process

1. When formulating the steel wire drawing process, the dimensional tolerance and ovality of the semi-finished steel wire must be carefully selected.

2, reasonable choice of pass compression rate, to meet the production efficiency of the premise, the use of multi-pass small compression rate process.

3. Ensure sufficient cooling and lubrication to prevent surface scratches and high temperature rise during drawing, resulting in plastic decline.

4. The steel wire strength and chemical composition of different layers in the steel wire rope have certain requirements. The carbon content of the outer steel wire should be slightly lower than that of the inner steel wire to make it have better toughness, and the manganese content can be slightly higher to increase the wear resistance and not easy to brittle fracture.

3. design control

1. Control the pay-off tension of each steel wire in the strand and each strand in the rope to make the residual stress reasonably distributed.

2, as far as possible to reduce or control the friction of steel wire and rope strand walking in the twisting equipment, so as to control the tension and ensure its surface quality.

3, the correct design, processing and reasonable use of pre-deformation device, otherwise, will affect the contact pressure between the wire, resulting in stress balance changes, but also cause wire or strand surface scratches, increase surface defects.

4. Pre-tensioning. When the pre-tension is 40%-50% of the breaking force, it is better to improve its fatigue life, and the effect can be better when the action time is more than 2h.

5. Post-processing. After the twisting is completed, the wire rope is forged or compacted to improve its fatigue life.

4. correct use

1. Pay attention to the material, hardness, shape, size and machining accuracy of the pulley used in the matching wire rope.

2. Maintain good and correct lubrication.

Use within a reasonable temperature range.

4. Pay attention to the influence of environment and medium.

In the process of using the wire rope, the quality of the wire rope must be checked regularly and used correctly. The fatigue life of the wire rope can be effectively improved according to the method of the hundred-gram editor to ensure safe operation.