The experience and skills of designers play a key role in the design and manufacture of molds. Whether the design is reasonable can only be confirmed by die test; The mold needs to be tried several times and revised repeatedly before it can be finally completed. productive practice

Once some molds are put into use on the production line, there will often be various problems, which can not meet the production requirements or technical requirements of the products, resulting in abnormal shutdown of the production line and many unstable factors. what

However, how to improve the stability of mold has become a practical problem faced by mold manufacturing enterprises. The article is provided by forging net.

Stability of die stamping and its influencing factors

What is stability? Stability is divided into process stability and production stability. Process stability refers to the process scheme that meets the stability of qualified products; Production stability refers to the stable production capacity in the production process.

Because most domestic mold manufacturing enterprises are small and medium-sized enterprises, and quite a few of them are still in the traditional workshop-style production management stage, the stability of molds is often ignored, which leads to long mold development cycle and high manufacturing cost, which seriously restricts the development pace of enterprises.

Let's take a look at the main factors that affect the stability of die and stamping, namely: the use of die materials; Strength requirements of mold structural parts; Stability of stamping material performance; Fluctuation characteristics of material thickness; The range of material changes; Tensile reinforcement; The range of BHF variation; Selection of lubricant.

Comprehensively weigh the 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 stamping performance, the instability of stamping material performance, the fluctuation of stamping material thickness and the change of stamping material not only directly affect the precision and quality of stamping, but also may lead to the damage of the die.

Take the stretching rib as an example, it plays a very important role in stamping forming. In the process of stretch forming, the product needs to have a certain size and

The tensile force properly distributed along the fixed periphery comes from the force of stamping equipment, the deformation resistance of the material at the edge and the flow resistance on the surface of the blank holder. And flow resistance, if only relying on blank holder force.

The friction between the mold and the material is not enough.

Therefore, it is necessary to set tension ribs on the blank holder to increase the resistance of feeding and make the material produce greater plastic deformation and fullness.

Plastic deformation and plastic flow requirements of foot materials. At the same time, by changing the size and distribution of the tensile rib resistance, the speed of material flowing into the die and the feeding speed are controlled, so that the tensile force of each deformation zone of the tensile part and its

Effectively adjust the distribution to prevent the product from cracking, wrinkling, deformation and other quality problems during stretch forming. It can be seen from the above that the size and root of tensile resistance must be considered in the process of drawing up stamping process and die design.

According to the change range of BHF, tensile bars are set and the form of tensile bars is determined, so that each deformation area can be formed according to the required deformation mode and degree.

In order to solve the problem of mold stability, the following aspects must be strictly controlled:

(1) In the process formulation stage, through the analysis of products, the possible defects of products in manufacturing can be predicted, so as to formulate a stable manufacturing process plan;

(2) Standardization of production process and production technology;

(3) establish a database and constantly summarize and optimize it; With the help of CAE analysis software system, the optimal solution is obtained.