Cup protrusion testing machine is a professional testing equipment used to evaluate the formability of metal sheets. Its core function is to simulate the stamping process and test the material's resistance to cracking and ductility during plastic deformation. The working principle of this device is to use a punch to gradually press a circular sample into a concave mold, forming a convex hull, until a penetrating crack appears on the surface of the sample. At this time, the stamping depth (i.e. "cupping value", in millimeters) is measured to determine the stamping adaptability of the material.

The main purpose of the cupping tester is to: 1. Material research and performance evaluation: In the research and development stage of metal materials, the formability of different alloys, heat treatment processes, or sheet thicknesses can be compared. For example, the development of high-strength steel plates for automobiles requires verification of their anti cracking ability during body stamping through cupping tests to ensure that the material meets the requirements of lightweight and safety. 2. Production quality control: On the board production line, cupping test is a key step in detecting the mechanical properties of finished products. Through sampling testing, it is possible to quickly determine whether the formability of the sheet metal has decreased due to rolling process deviations, avoiding the flow of unqualified materials into subsequent processing steps (such as home appliance casings, container stamping, etc.). 3. Stamping process optimization: For mold design and stamping parameter debugging, the cup protrusion value can directly guide process adjustment. For example, in the aerospace field, the stamping of complex curved parts requires setting parameters such as punch speed and mold fillet radius based on the cupping data of the material, in order to reduce material waste and labor loss during the trial molding process. 4. Industry standards and scientific research teaching: The cupping test complies with international standards such as ISO and ASTM, and is a universal method for testing the performance of metal sheets. In universities and research institutions, this equipment is commonly used for material mechanics experimental teaching, helping students understand the practical application of plastic deformation and fracture mechanisms. In short, the cupping test machine quantifies the stamping forming limit of materials and provides key data support for the entire chain from material research and development to industrial production. It is an indispensable performance testing tool in the field of metal processing.