The Reasons and Preventive Measures for Shifting and Warping of Stamping Parts in Progressive Die
1. Introduction
Sheet metal parts produced by progressive die stamping have high accuracy and a variety of forms, and are widely used in various fields. However, when the progressive die is used for stamping, shifting and warping of the stamped parts often occurs, which affects the use performance and accuracy of the stamped parts. In order to improve the stamping quality and reduce the shifting and warping of the stamped parts, it is necessary to find out the reasons and preventive measures.
2. Causes of Parts Shifting and Warping
2.1 Lubrication Issues
In the stamping process of progressive die, lubrication plays a very important role. The lubrication of the die will affect the lubrication of the stamping materials, which will affect the stamping accuracy, plastic deformation and chance of shifted material and warping. If the lubrication is insufficient, the material will be adhered to the die surface, and the chance of parts shifting and warping will be increased due to the difference of stiffness between the materials and the die surfaces. In addition, the excessive lubrication will also deform the stamped parts, which can cause the parts to shift and warp.
2.2 Inaccurate Die Design
In the process of die design, the die designer should reason the cause-and-effect relationship between the design and the stamping, take into account the possibility of the deformation of the stamped parts and the possibility of shifting and warping of the materials, and make reasonable die design to match the conditions of the stamping material, forming technology and die structure. If the design is inaccurate and lacks consideration, it will result in the displacement and deformation of the parts during the stamping process, and even cause the shifting and warping of the stamped parts.
2.3 Poor Stamping Process
In the process of stamping, the die stamping parameters, such as material thickness, tempering condition, forging temperature, pre-tension and maintenance of die, should be accurately determined. Otherwise, due to the inaccurate setting of the stamping parameters or the poor maintenance and maintenance of the die, it will lead to repeated impacts, improper pre-tension, uneven material feeding and die wear, which will cause the stamped parts to be deformed and even shifted and warped.
3. Methods to Prevent Parts Shifting and Warping
3.1 Reasonable Lubrication
The lubricant should be carefully selected according to the material, die structure and other conditions of the stamped parts. The proper amount of lubricant should be applied to ensure the normal stamping process and the accuracy of the stamped parts. Meanwhile, the uniformity and viscosity of the lubricant should be ensured to avoid deformation, shifting and warping of the parts due to too much or too little lubricant.
3.2 Accurate Die Design
When designing the progressive die, it is necessary to accurately calculate the design parameters and consider the various factors in the progressive die stamping process, such as the strength of the material and the forming process, to ensure the rationality of the designed die structure, forming process and die parameters, so as to avoid the deformation and shifting of the stamped parts caused by inaccurate design.
3.3 Reasonable Stamping Process
The stamping parameters should be set according to the material and die structure of the stamped parts so as to ensure the accuracy of the stamping parameters, and then conduct the stamping process at the stable parameters. During the stamping process, it is necessary to pay attention to the temperature and tension of the stamping materials, and it is best to use automatic equipment with temperature control function. In addition, the wear degree of the die should also be pay attention to, and the necessary die maintenance should be done timely.
4. Conclusion
The shifting and warping of stamped parts not only has a great influence on the use performance of the stamped parts, but also greatly affects the production efficiency and production cost. Therefore, in order to ensure the high accuracy of the progressive die stamping and improve the stamping quality, it is necessary to pay attention to lubrication, die design and stamping process. It is necessary to select the correct lubrication, reasonably design the dies and set the reasonable stamping parameters, so as to reduce the chance of shifting and warping of the stamped parts and ensure the accuracy of the stamping.
