Production practice, some mold once put into use on the production line, but often have a variety of problems, unable to meet the production requirements or technical requirements, resulting in abnormal shutdown of the production line, bringing a lot of instability. Thus, how to improve the stability of the mold has become a real problem facing mold manufacturers.
Mold design and manufacturing, designers experience and skills play a key role. The design is reasonable or not, through the test to confirm, and the mold is through multiple trial and repeated modifications, in order to finalize. Production practice, some mold once put into use on the production line, but often have a variety of problems, unable to meet the production requirements or technical requirements, resulting in abnormal shutdown of the production line, bringing a lot of instability. Thus, how to improve the stability of the mold has become a real problem facing mold manufacturers.
Mold and stamping stability and its influencing factors
What is stability Stability is divided into process stability and production stability. Process stability refers to the production process to meet the stability of qualified products; production stability refers to the production process has the stability of the production capacity.
Let us first look at the main factors affecting the stability of the mold and stamping. Respectively: the use of mold materials; strength requirements of the mold structure; stability of the performance of the stamping material; material thickness fluctuations; material range of variation; tensile strength of the bar; blank holder force range of changes; choice of lubricant Weigh the various factors that affect stability
It is noteworthy that, in the stamping process, because each stamping plate has its own chemical composition, mechanical properties and stamping properties are closely related to the characteristics of the stamping material performance instability, fluctuations in the thickness of the stamping material, and Stamping material changes, not only directly affect the accuracy and quality of stamping process, but also may result in damage to the mold.
For example, the tensile bar occupies a very important position in the stamping process. In the stretch forming process, the forming of the product requires a certain amount of tension along the fixed perimeter, which is derived from the force of the stamping device, the deformation resistance of the material at the edge, and the flow resistance on the bead face . The flow resistance, if only rely on blank holder force, the friction between the mold and material is not enough.
To this end, we must set the blank holder can produce greater resistance of the tensile bar, in order to increase the resistance of the feed, so that the material has a greater plastic deformation in order to meet the plastic deformation and plastic flow requirements. At the same time, by changing the size and distribution of the resistance of the draw bar, and controlling the speed of the material flowing into the mold and the amount of feed, effective adjustment of the pull force and its distribution in the various deformed regions of the draw bar is achieved so as to prevent stretching Forming the product rupture, wrinkling, and quality problems such as deformation.
From the above, in the development of stamping process and mold design process, we must consider the size of the tensile resistance, according to the range of blank holder force to arrange the tensile tendons and determine the form of tensile ribs, so that the deformation of the area as needed deformation Form and degree of deformation to complete the formation. 【Suzhou mold design】