Common die stability problems and treatment methods
Common die stability problems and treatment methods
Mould in use process, need according to the requirement of the production requirements or technology, adoption of a certain line, sometimes didn't pay attention to some details, many factors can cause instability mould, this will seriously affect the use of mould manufacturing artifacts is able to, so we in the manufacturing must be attention to the problem of relative stability.
The stability of mould and stamping forming and its influencing factors
What is stability? Stability is divided into process stability and production stability. Process stability refers to the process plan to meet the stability of production qualified products; Production stability refers to the ability to produce stability during production.
First let's take a look at the main factors affecting the stability of the die and stamping forming. The strength requirement of mould structure parts; Stability of stamping material performance; The fluctuation of material thickness; The range of material variation; Tensile bar resistance; Variation range of pressure edge force; Choice of lubricants.
A comprehensive balance of factors affecting stability
It is important to note that in the process of stamping, because each kind of pressing plate has its own chemical composition, mechanical properties and is closely related to the stamping performance characteristic value, stamping material performance is not stable, punching material thickness fluctuation, and the change of the stamping material, not only directly affects the precision of the stamping process and quality, also may cause the damage of the mould.
In the case of stretch reinforcement, it occupies a very important position in stamping forming. In stretch forming process, products, need to have a certain size, shape and along the fixed around the appropriate distribution of tension, the pulling force from stamping device, edge part material deformation resistance, and flow resistance on the surface of the blank holder ring. In the case of flow resistance, the friction between the mold and the material is not sufficient if it is only dependent on the force of the pressure.
To this end, still must set on blank holder ring can produce larger resistance tensile reinforcement, to increase the feeding resistance, so that the material produces large plastic deformation, to meet the requirements of material of the plastic deformation and plastic flow. At the same time, by changing the size and distribution of the tensile reinforcement resistance control and material to the mold flow speed and feed rate, realize the tensile strain in the deformation area and its distribution of effective adjustment, thus preventing stretch forming product rupture, wrinkling, and deformation and other quality problems.
By visible, in the process of stamping process and die design, the size of the stretching resistance must be considered, according to the range of blank-holder force will decorate tensile reinforcement and determine the form of tensile reinforcement, make each region according to the need of complete forming deformation mode and deformation extent.
