In the design and manufacture of drawing dies, the experience and skills of designers play a key role. Whether the design is reasonable or not can only be confirmed by trial mode; while the drawing die needs to go through multiple trials and repeated modifications before it can be finally completed. In production practice, once some drawing dies are used on the production line, they often have various problems, which cannot meet the production requirements or technical requirements of the product, causing abnormal shutdown of the production line, etc., which brings many unstable factors. Therefore, how to improve the stability of drawing dies has become a practical problem faced by drawing die manufacturers.
Stability of drawing die and stamping and its influencing factors
What is stability? Stability is divided into process stability and production stability. Process stability refers to a stable process plan for producing qualified products; production stability refers to a stable production capacity during the production process.
Since most of the domestic drawing die manufacturing enterprises are small and medium-sized enterprises, and a considerable part of them are still in the traditional workshop-style production management stage, they often ignore the stability of the drawing die, causing problems such as long drawing die development cycle and high manufacturing cost, which are serious. Restricted the pace of development of the enterprise.
Let us first take a look at the main factors that affect the stability of drawing die and stamping forming. They are: the use of drawing die materials; the strength requirements of drawing die structural parts; the stability of stamping material properties; the fluctuation characteristics of material thickness; the range of material changes ; The resistance of the tensile ribs; the range of the blank holder force; the choice of lubricants.
Comprehensively weigh various factors affecting stability
It is worth noting that in the stamping process, because each stamping sheet has its own chemical composition, mechanical properties and characteristic values closely related to the stamping performance, the performance of the stamping material is unstable, the thickness of the stamping material fluctuates, and The change of the stamping material not only directly affects the accuracy and quality of the stamping forming process, but may also cause damage to the drawing die.
Take stretch ribs as an example, which occupies a very important position in stamping forming. In the stretch forming process, the forming of the product requires a certain amount of pulling force that is appropriately distributed along the fixed periphery. This pulling force comes from the force of the stamping equipment, the deformation resistance of the material at the edge, and the flow resistance on the blank holder surface . If the flow resistance only depends on the blank holder force, the friction between the drawing die and the material is not enough.
For this reason, it is also necessary to install a tensile rib that can produce greater resistance on the blank holder to increase the resistance of the feed, so that the material produces greater plastic deformation to meet the requirements of plastic deformation and plastic flow of the material. At the same time, by changing the size and distribution of the resistance of the stretched ribs, and controlling the speed of the material flowing into the drawing die and the amount of feed, the effective adjustment of the tensile force and its distribution in each deformation zone of the stretched part is realized, thereby preventing stretching Product quality problems such as cracks, wrinkles, and deformation during forming. It can be seen from the above that in the process of drawing up the stamping process and drawing die design, the tensile resistance must be considered, and the tensile ribs should be arranged according to the range of blank holder force and the form of the tensile ribs should be determined so that each deformation area is deformed as required. The way and the degree of deformation are completed.
If we make a summary, in order to solve the drawing die stability problem, we need to strictly check the following aspects:
① In the process formulation stage, through the analysis of the product, the defects that may occur in the product's manufacturing are predicted, so as to formulate a stable manufacturing process plan;
②Implement the standardization of the production process and the standardization of the production process;
③Establish a database, and continuously summarize and optimize it; use the CAE analysis software system to get the most optimized solution.
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