Welcome to Stamping Die Maker-Changdong Stamping Dies Co., Ltd. weblist! HTML Map - XML Map - TXT Map -

Home » News Center» Technical Exchange

What is the Springback and What are Influencing Factors of Springback on Metal Stamping Parts?

What is the Springback and What are Influencing Factors of Springback on Metal Stamping Parts?


After the load is removed, and the shape of the deformed parts gets restored partially, which is the springback. In other words, springback is the geometric change to the part after the forming process while the part has been released from the forces of the forming tool. Upon completing the forming of the sheet metal, stretch-drawn and deep-drawn parts spring back, accordingly having some influence on the dimensions accuracy of the finished part and affecting the assembly precision of the part. The final shape of the stamping part is influenced by the springback, making it difficult to produce the stamping part. Therefore, the manufacturing industry is confronted with some practical issues:1>. after the springback, the prediction of the final parts geometry; 2>. how to compensate for these effects with appropriate tools.

After applying new materials, the number of new issues are increasing. Forming parts made from new materials are much easier to be influenced by the springback than parts made from traditional deep-drawn steel. Regarding classic sheet metal defects, for example, wrinkles and cracks, the stresses in the sheet metal are more crucial. If the springback occurs, these models are not enough to predict the possible deformation. If so, the strain is decisive and a considerably higher accuracy is very much important.

While the development of tools, the springback is compensated by the software, to remove the part from the tool straight away in the necessary dimensions. Simulation software could not only discover the springback early on, it could also compensate accordingly. By means, tooling processes are accordingly improved and manufacturing cost are decreased. Thus, springback compensation minimizes the risk of expensive changes to processes or stamping die later on.

The springback of metal stamping parts is a difficult problem for automotive stamping parts, especially high-strength steel materials with a yield strength over 600Mpa. Nowadays, its still a big difficulty to solve out the springback of stamping parts. Below are several influencing factors.

1. Material Properties

From an ordinary plate to the high strength plate, different sheets are with the different yield strength. The higher the yield strength of the sheet metal is, the more likely its to springback, such as S500MC, DP780(with good forming properties). Compared with cold-rolled sheet materials, the hot-rolled sheet material has the worse surface quality, the tolerance of the thickness is larger, the mechanical properties of material are not more stable, and the elongation rate of the material is lower.

2. Material Thickness

During the forming process, the sheet material thickness affects greatly on the bending performance. The thicker the plate is, the less the rebound phenomenon would be, which is because as the thickness of the sheet increases, the amount of the plastic deformation material increases, the elastic recovery deformation also increases, and the resilience decreases accordingly.

3. Parts Shape

Different parts shapes are with different springback. For parts with complicated shapes, in order to prevent the springback caused by the incomplete forming process, normally one process(shaping) is added accordingly. However, some special shaped parts, such as u-shaped parts, are more possible to rebound. Therefore, its very important and necessary to consider the springback compensation In the analysis of the forming process.

4. Bending Radius

The relative bending radius is proportional to the springback value. That is to say, the greater the curvature of metal stamped parts, the less possible its to be bent.

5. Bending Center Angle

The larger the value of the bending center angle is, the bigger the springback cumulative value is, causing the serious springback. With the increase of the bending center angle, the deformation length of stamping parts increases correspondingly.

6. Forming Technique

The forming process is a very important aspect, restricting its springback value. Normally, the springback effect of correcting bending is better than that of free bending.

7. Matched Condition of the Stamping Dies Clearance

In the relative working components, the metal stamping die should be designed with a gap of twice the thickness of the material, and the part shall be accommodated in the gap. To better achieve the material flow, the parts of stamped dies shall be developed after finishing the dies manufacturing. Especially for bending die, the larger the clearance of the working component is, the great the springback is.


Shenzhen Changdong Stamping Dies CO., LTD. © copyright Add:NO. 56-B, Fuming South Road, Dalang, Dongguan, P.R.C 

E-mail:sales@chang-dong.com Tel:0086-769-8106 1256 0086-181-1876-8847 Sales Manager: Ms. Alice Fax:0086-769-8106 1926

Changdong is one of professional metal stamping die maker in China more than 10 years. We provide metal stamping dies to the customers in 16 countryies.
The company makes the progressive dies and transfer dies. As a stamping die manufacturer, also we provide the prototype dies and metal prototype parts for the short-run production.

Our main products: Stamping Die | Drawn Die | Metal Stampings | Checking Fixture | Progressive Die | Transfer Die | Metal Prototypes | Metal Stamping Tools| Prototype Parts | Prototype Die

回到顶部 电话咨询 在线地图 返回首页