The bending tester has two supporting rollers, the distance between the supporting rollers can be adjusted, and the bending center with different diameters can be equipped. The bending center diameter is specified by the relevant standards. The bending center diameter can be determined according to the diameter of the reinforcement. The instrument works reliably and is easy to operate. The machine usually has two loading stress methods, namely three-point bending and four-point bending. The bending strength obtained by different loading methods is also different. The two loading methods have their own advantages and disadvantages. The three-point bending loading method is simple, but due to the concentrated loading method and uneven bending distribution, it may not be able to display the defects of a certain part and cannot achieve the effect. Four-point bending will lead to uniform distribution of bending moment and more accurate test results. However, the structure of the pressure clamp is complex and the frequency of use is reduced in industrial production.
Instructions for use of bending tester:
1. Check whether the mechanical performance is good and whether the workbench and bending machine table are level; And prepare various mandrel tool stops.
2. Install the mandrel, forming shaft, iron retaining shaft or variable retaining frame according to the diameter of the processed reinforcement and the requirements of the bending machine. The diameter of the mandrel shall be 2.5 times of the diameter of the reinforcement.
3. Check that the mandrel and stop are free of damage and cracks, and the protective cover is fastened and reliable. The operation can be started only after the empty machine is confirmed to be normal.
4. During the operation of the testing machine, insert one end of the reinforcement to be bent into the fixed gap, and the other end is fixed close to the body and pressed tightly by hand. Check that the body is fixed, and it can only be started when it is installed on the side that blocks the reinforcement.
5. During the operation, it is forbidden to replace the mandrel, change the angle and adjust the speed, and it is also forbidden to add oil or remove oil.
6. When bending reinforcement, it is strictly prohibited to process reinforcement diameter, number of pieces and mechanical rotation speed that exceed the mechanical requirements.
7. When bending high hardness or low alloy steel bars, replace the large limit diameter according to the provisions of the mechanical nameplate, and replace the corresponding mandrel.
8. It is forbidden to stand within the operating radius of bending reinforcement and on the side of the fuselage without fixing. The bent semi-finished products shall be stacked neatly, and the hook shall not be upward.
9. When reversing, it must be carried out after stopping stably.
10. After the operation of the testing machine, clean the site, maintain the machinery, and power off the lock box.
