GB/T242-2007 Non ferrous Metal Tube Expansion Testing Machine

GB/T242-2007 Non ferrous Metal Tube Expansion Testing MachineExperimental principlePress the end of the metal pipe with a conical core to evenly expand it to the specified diameter, and detect the plastic deformation ability and surface cracks of the pipe. The top core angle (30 °, 45 °, 60 °) needs to be selected according to product standards

The GBT 242-2007 metal pipe expansion testing machine is mainly used to test the expansion force of seamless pipes and welded pipes with outer diameter ≤ 150mm (non-ferrous metal pipes ≤ 100mm) and wall thickness ≤ 10mm.

Sample of metal pipe expansion testing machine:

The length of the sample depends on the angle of the top core. When the top core angle is equal to or less than 30 °, the length L of the specimen should be approximately 2D; when the top core angle is greater than 30 °, the length L of the specimen should be approximately 1.5D. If the remaining length of the cylindrical part after the expansion test is not less than 0.5D, a shorter specimen can be used.

2.The two end faces of the sample should be perpendicular to the axis of the pipe. The edge of the experimental end can be rounded or chamfered using a beam or other methods. Note: If the test results meet the test requirements, the edges of the specimen may not be rounded or chamfered.

When testing welded pipes, the excess weld height inside the pipe can be removed.

GB/T242-2007 Non ferrous Metal Tube Expansion Testing MachineExperimental procedure：

The experiment should generally be conducted within the room temperature range of 10 ℃ to 35 ℃. For tests required to be conducted under controlled conditions, the test temperature should be 23 ℃± 5 ℃

2. Apply a steady force to the conical core to press it into the end of the specimen for expansion until the required outer diameter is reached. During the expansion period, the axis of the conical core should be consistent with the axis of the specimen.

The expansion rate expressed as a percentage of the original outer diameter D or the larger outer diameter D of the sample after expansion should be specified in the relevant product standards. The top core angle β should also be specified in the relevant product standards.

Note: Calculation formula for expansion rate (X2):

When testing longitudinal welded pipes, it is allowed to use grooved top cores to accommodate the weld seam height inside the pipe.

3. Allow lubrication of the top core. During the experiment, the top core should not rotate relative to the specimen.

When disputes arise, the movement speed of the pressure plate should not exceed 50mm/min

5. The evaluation of the results of the expansion test should be based on the requirements of relevant product standards. When there is no provision in the product standard, if there are no visible cracks without using a magnifying glass, it should be evaluated as qualified. Slight cracking at the edges and corners of the sample should not be considered as scrap.

GB/T242-2007 Non ferrous Metal Tube Expansion Testing MachineTechnical parameters:

1. Product specification: HY-30080

2. Accuracy level: Level 0.5

3. Load: 300KN

4. Effective force measurement range: 0.1/100-100;

5. Test force resolution, load ± 500000 yards; There is no distinction between internal and external, and the resolution remains unchanged throughout the entire process.

6. Effective test width: 600mm

7. Effective experimental space: 800mm

8. Test speed: 0.001~300mm/min (adjustable arbitrarily)

9. Speed accuracy: within ± 0.5% of the displayed value;

10. Displacement measurement accuracy: within ± 0.5% of the displayed value;

11. Deformation measurement accuracy: within ± 0.5% of the displayed value;

12. Stress controlled rate range: 0.005% to 6% FS/S

13. Stress controlled rate accuracy: When the rate is less than 0.05% FS/S, it is within ± 1% of the set value; When the rate is ≥ 0.05% FS/S, it is within ± 0.5% of the set value;

14. Strain control rate range: 0.002% to 6% FS/S

15. Strain control rate accuracy: When the rate is less than 0.05% FS/S, it is within ± 2% of the set value; When the rate is ≥ 0.05% FS/S, it is within ± 0.5% of the set value;

16. Constant force/displacement/deformation measurement range: 0.5% to 100FS

17. Constant force/displacement/deformation measurement accuracy: When the set value is less than 10% FS, it is within ± 1% of the set value; When the set value is ≥ 10% FS, it is within ± 0.1% of the set value;

18. Test bench lifting device: fast/slow speed control, can be inched;

19. Test bench safety device: electronic limit protection

20. Test bench return: Manual can return to the initial position of the test at high speed, and automatic can return automatically after the test is completed;

21. Test automatic parking with fixed time, test automatic parking with fixed deformation, test automatic parking with fixed load

22. Overload protection: Automatic protection when the maximum load exceeds 10%;

23. Automatic diagnostic function, regularly checks the measurement system and drive system for overload, overvoltage, overcurrent, overload, etc., and immediately protects in case of abnormal situations

24. Power supply: 5000W

25. Host weight: 1800kg

26. Power supply voltage: 380V (three-phase)

27. Host size: 1000 * 680 * 230mm