Solve the stability of the mold, it is necessary to strictly control the three passes.
Designer experience and skills play a key role in the design and manufacture of molds. Whether the design is reasonable or not can be confirmed by trial mode; and the mold needs to be tried and modified repeatedly to complete it. In the production practice, once some molds are put into the production line, they often have various problems, which can not meet the production requirements or technical requirements of the products, resulting in abnormal shutdown of the production line, which brings many unstable factors. Therefore, how to improve the stability of the mold has become a practical problem faced by mold manufacturing enterprises.
Stability of mold and stamping and its influencing factors
What is stability? Stability is divided into process stability and production stability. Process stability refers to a process plan that satisfies the stability of a qualified product; production stability refers to a production capacity with stability during the production process.
Since most domestic mold manufacturing enterprises are small and medium-sized enterprises, and quite a few of them are still in the traditional production management stage, they often neglect the stability of the mold, resulting in long mold development cycle and high manufacturing cost. It has restricted the pace of development of enterprises.
Let us first look at the main factors affecting the stability of the mold and stamping, namely: the use of mold materials; the strength requirements of the mold structural parts; the stability of the properties of the stamping materials; the fluctuation characteristics of the material thickness; the range of material changes The resistance of the tensile ribs; the range of the blanking force; the choice of lubricant.
Comprehensive balance of factors affecting stability
It is worth noting that in the stamping process, since each stamped sheet has its own chemical composition, mechanical properties and characteristic values ​​closely related to the stamping properties, the properties of the stamping material are unstable, the thickness of the stamping material fluctuates, and The change of stamping material not only directly affects the precision and quality of stamping and forming, but also may cause damage to the mold.
Taking stretch ribs as an example, it occupies a very important position in stamping. In the stretch forming process, the forming of the product requires a pulling force of a certain size and appropriately distributed along the fixed periphery. The pulling force comes from the force of the punching device, the deformation resistance of the material at the edge portion, and the flow resistance on the crimping ring surface. . However, if the flow resistance is generated only by the action of the blank holder force, the friction between the mold and the material is insufficient.
To this end, it is also necessary to provide a tensile rib on the crimping ring which can generate a large resistance to increase the resistance of the feed, thereby causing a large plastic deformation of the material 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 tensile ribs, and controlling the speed of the material flowing into the mold and the amount of feed, effective adjustment of the tensile force and its distribution in each deformation region of the tensile member is achieved, thereby preventing stretching. Quality problems such as cracking, wrinkling, and deformation of the product during forming. It can be seen from the above that in the process of formulating the stamping process and the mold design, the magnitude of the tensile resistance must be considered. The tensile ribs are arranged according to the range of the blanking force and the form of the tensile ribs is determined, so that the deformation regions are deformed as needed. The form and degree of deformation are completed.
If you make a summary, in order to solve the problem of mold stability, you need to strictly control the following aspects:
1 In the process development stage, through the analysis of the product, it is predicted that the product may be defective in the manufacturing, so as to develop a stable manufacturing process plan;
2 Implement standardization of production processes and standardization of production processes;
3 establish a database, and continue to summarize and optimize; with the CAE analysis software system, to obtain an optimal solution.
Laminated Veneer Lumber (LVL)
Stability of mold and stamping and its influencing factors
What is stability? Stability is divided into process stability and production stability. Process stability refers to a process plan that satisfies the stability of a qualified product; production stability refers to a production capacity with stability during the production process.
Since most domestic mold manufacturing enterprises are small and medium-sized enterprises, and quite a few of them are still in the traditional production management stage, they often neglect the stability of the mold, resulting in long mold development cycle and high manufacturing cost. It has restricted the pace of development of enterprises.
Let us first look at the main factors affecting the stability of the mold and stamping, namely: the use of mold materials; the strength requirements of the mold structural parts; the stability of the properties of the stamping materials; the fluctuation characteristics of the material thickness; the range of material changes The resistance of the tensile ribs; the range of the blanking force; the choice of lubricant.
Comprehensive balance of factors affecting stability
It is worth noting that in the stamping process, since each stamped sheet has its own chemical composition, mechanical properties and characteristic values ​​closely related to the stamping properties, the properties of the stamping material are unstable, the thickness of the stamping material fluctuates, and The change of stamping material not only directly affects the precision and quality of stamping and forming, but also may cause damage to the mold.
Taking stretch ribs as an example, it occupies a very important position in stamping. In the stretch forming process, the forming of the product requires a pulling force of a certain size and appropriately distributed along the fixed periphery. The pulling force comes from the force of the punching device, the deformation resistance of the material at the edge portion, and the flow resistance on the crimping ring surface. . However, if the flow resistance is generated only by the action of the blank holder force, the friction between the mold and the material is insufficient.
To this end, it is also necessary to provide a tensile rib on the crimping ring which can generate a large resistance to increase the resistance of the feed, thereby causing a large plastic deformation of the material 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 tensile ribs, and controlling the speed of the material flowing into the mold and the amount of feed, effective adjustment of the tensile force and its distribution in each deformation region of the tensile member is achieved, thereby preventing stretching. Quality problems such as cracking, wrinkling, and deformation of the product during forming. It can be seen from the above that in the process of formulating the stamping process and the mold design, the magnitude of the tensile resistance must be considered. The tensile ribs are arranged according to the range of the blanking force and the form of the tensile ribs is determined, so that the deformation regions are deformed as needed. The form and degree of deformation are completed.
If you make a summary, in order to solve the problem of mold stability, you need to strictly control the following aspects:
1 In the process development stage, through the analysis of the product, it is predicted that the product may be defective in the manufacturing, so as to develop a stable manufacturing process plan;
2 Implement standardization of production processes and standardization of production processes;
3 establish a database, and continue to summarize and optimize; with the CAE analysis software system, to obtain an optimal solution.
Laminated Veneer Lumber (LVL)
Laminated Veneer Lumber (LVL) is another type of Plywood. It is made of multiple layers of thin wood (along the same direction of wood fiber), assembled with adhesives through hot-pressing.
Currently, the core veneers are mainly Poplar, Eucalyptus, Eucalyptus and Poplar mixed, Paulownia and Poplar mixed etc.
LVL Door Frame,Wood Door Fram,Engineered Wood Door Frame
Fushi Wood Group , http://www.fushiplywood.com