Interpretation of sheet formability | ｜GBW‑60D microcomputer-controlled cupping tester

> Introduction: automotive sheet metal, household appliance shells, metal stamping parts, aluminum alloy plates ... A large number of products in daily life are stamped and formed by metal sheets. Whether the plasticity of sheet metal is good or not, whether it will crack during stamping, * * cupping test is the core testing means to evaluate the stamping forming ability of sheet metal, and GBW‑60D microcomputer-controlled cupping testing machine is the precise testing equipment to complete this test.

In the metalworking industry, the plastic formability of sheet directly determines the product yield. The same sheet metal, some can be stretched into complex curved surfaces, and some will crack when slightly stamped. Erickson test is to simulate the biaxial tensile stress state of sheet metal in the laboratory, and get the IE value of * * through standardized test, so as to judge the ductility and crack resistance of sheet metal, and provide reliable basis for material selection, incoming inspection and process optimization.

# # Benchmark the national standard, and standardize the detection of plate cupping.

The GBW‑60D microcomputer-controlled cupping testing machine strictly follows the national standard GB/T 41562020 "Cupping Test of Thin Sheet and Thin Strip of Metal Materials", which can be adapted to various metal sheet materials such as steel plate, aluminum plate, copper plate, stainless steel and coated sheet, and supports the customization of non-standard molds to meet the international test requirements of American standard and European standard.

* * Test principle: * *
Clamping a metal sheet sample between a die and a cushion die, and uniformly pressing the sample by a spherical punch to cause plastic bulging deformation of the sheet; At the moment when the plate appears through crack, the depth pressed by the punch is the cupping value. The larger the cupping value, the better the plastic formability of the sheet.

* * Adapted sample specification: * *

-Plate thickness: 0.05‑2mm, supporting ultra-thin plate detection.
-specimen width: 90‑100mm.
-standard configuration φ20mm spherical punch, complete set of standard cushion die and pressing die.

# # Equipment Core Performance and Technical Highlights

The equipment adopts servo motor constant rate loading structure, which is different from the traditional hydraulic model. The stamping speed is infinitely adjustable at 2‑100mm/min, and the clamping force is independently controllable and calibratable. The whole machine runs stably and the test repeatability is high.

* * Automatic crack stop * *
Monitor the change of punching force in real time, and the equipment will automatically stop the test when there is a penetrating crack in the plate, so as to avoid data deviation caused by excessive test; Optional camera module, video playback can accurately locate the cracking moment, further improving the accuracy of judging the cupping value.

* * High-precision sensor acquisition system * *
Equipped with spoke load sensor+high precision encoder; The resolution of cupping value can reach **0.01mm**, the maximum stamping load is 60kN, and the maximum clamping load is 10kN. The force value and displacement data are collected synchronously, and the measurement results are true and reliable.

* * Simple operation, fully automatic test operation * *
After the sample clamping is completed, the whole test process can be started with one key: automatic clamping, uniform stamping, crack identification and shutdown, and data recording to reduce the error caused by human operation; The fixture is easy to disassemble and assemble, and the sample replacement efficiency is high.

* * Intelligent measurement and control software Teststar**
Developing special measurement and control software based on Windows platform;
Real-time display of stamping load, clamping force and cupping displacement, drawing force-time test curve.
Key test results such as peak memory, automatic storage of maximum cupping, etc.
Complete data storage, batch management, direct printing of test reports, and support for data export and archiving.

* * Multiple security protection mechanisms * *
With overload protection and piston stroke limit protection, it can automatically unload and stop in case of overload condition, ensuring the safety of equipment and operators.

# # # A quick look at key technical parameters

form

| Project | Parameters |
| --- | --- |
| Maximum punching load | 60kN |
| Maximum clamping load | 10kN |
| Punch stroke | 60mm |
| The resolution of cupping value | 0.01mm |
| Test speed | 2‑100mm/min (stepless adjustment) |
| Applicable plate thickness | 0.05‑2mm |
| Overall dimension of the whole machine | 1100×1000×1600mm |

# # Main application scenarios

This cupping tester is widely used in:
Iron and steel, non-ferrous metal plate production enterprises: plate factory incoming inspection, control the forming quality of plate;
Automobile, household appliances, hardware manufacturing enterprises: raw materials enter the factory for acceptance, and qualified stamping plates are screened to reduce the production scrap rate;
Third-party testing institutions, universities and scientific research institutes: research and development of new materials, comparative tests, and research on the technological properties of plates.

# # Standard Configuration List

1. 60kN portal host (servo motor, precision screw drive)
2. Electric clamping control system
3. A set of GB standard cupping dies (punch, cushion die and pressing die)
4. Teststar Chinese measurement and control software
5. Stamping load sensor, sample bearing sensor and high-precision encoder.
6. Lenovo commercial computers and HP A4 laser printers
7. Complete set of electrical control system

# # Write at the end

Stamping cracking is a common pain point in sheet metal processing industry, and cupping test is to put the forming risk in the production site to the laboratory testing. A precise cupping testing machine helps enterprises to quickly identify the performance of sheet metal, reduce the cost of trial and error, and build a solid first line of defense for the quality control of sheet metal.