On the mold manufacturing enterprises are facing real problems

Design and manufacture of molds, the experience and skills of designers play a key role. Rational design or not, can be confirmed by test mode; and mold tryout is required by multiple and repeated changes to the final completion. Production practice, some die once put into use after the production line, but it tends to produce a variety of problems that can not meet production requirements or technical requirements, resulting in abnormal shutdown and other production lines, bringing many uncertainties. So, how to improve the stability of the mold, mold manufacturing enterprises to become reality facing.

The factors that influence the stability tradeoff

It is noteworthy that, in the stamping process, because each has its own sheet metal stamping chemical composition, mechanical properties and stamping properties are closely related to the characteristic values, unstable performance stamping material, stamping material thickness fluctuations, as well as stamping material changes, not only directly affect the quality and precision stamping process may also lead to mold damage.

To stretch tendons, for example, which they have occupied in forming a very important position. In the stretch-forming process, shaping the product requires a certain size, and the tension along the fixed perimeter proper distribution, which pull force from the stamping device, the deformation resistance of the edge portions of the material, and the flow resistance of the surface of the clamping ring . The flow resistance generated, if only rely on clamping force, the friction force between the mold and the material is not enough.

Stability and Influencing Factors mold and Stamping

What stability? Stability is divided into process stability and production stability. Stability refers to the process of qualified products to meet the production process scheme has stability; stability of production refers to the production process has a production capacity of stability.

As the domestic mold manufacturing enterprises are SMEs, and of which a considerable part of the business, still remain in the traditional stage production management workshops, often ignoring the stability of the mold, resulting in mold long development cycle, the problem of higher manufacturing costs, serious It restricted the pace of development of enterprises.

Let us look at the impact of mold and stamping stability factors, namely: the use of mold material; fluctuation characteristics of the material thickness;; range of material strength requirements of the mold structural parts; stamping material properties of stability ; drawbead of resistance; lubricant selection; BHF range.

To this end, the clamping ring must also set to produce a greater resistance to stretch tendons, in order to increase the resistance of the feed, so that the material to produce large plastic deformation, in order to meet the requirements of plastic deformation and plastic flow of the material. At the same time, by changing the resistance of the tensile reinforcement size and distribution, and control the flow of material into the mold speed and feed rate, to achieve the status of each tensile deformation and its distribution within the region stretching pieces of effective regulation to prevent stretch product rupture, wrinkling, deformation and other quality problems forming. As seen above, in the development of the stamping process and die design process, we must consider the size of stretch resistance, according to scope changes BHF arranged to stretch tendons and tendons stretched determine the form of the respective regions by the deformation of the deformation required manner and extent of modification is completed forming.