Topic
Stamping
About: Stamping is a research topic. Over the lifetime, 22501 publications have been published within this topic receiving 83554 citations.
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31 Mar 2019
TL;DR: In this paper, the relationship between the components of deformation rates and stresses is established, which allows to obtain a direct numerical solution of plastic deformation problems without FED iterative procedures, taking into account the real properties of the metal during deformation.
Abstract: It is shown that when modeling the processes of forging and stamping, it is necessary to take into account not only the hardening of the material, but also softening, which occurs during hot processing. Otherwise, the power parameters of the deformation processes are precisely determined, which leads to the choice of more powerful equipment. Softening accounting (processes of stress relaxation) will allow to accurately determine the stress and strain state (SSS) of the workpiece, as well as the power parameters of the processes of deformation. This will expand the technological capabilities of these processes. Existing commercial software systems for modeling hot plastic deformations based on the finite element method (FEM) do not allow this. This is due to the absence in these software products of the communication model of the component deformation rates and stresses, which would take into account stress relaxation. As a result, on the basis of the Maxwell visco-elastic model, a relationship is established between deformation rates and stresses. The developed model allows to take into account the metal softening during a pause after hot deformation. The resulting mathematical model is tested by experiment on different steels at different temperatures of deformation. The process of steels softening is determined using plastometers. It is established experimentally that the model developed by 89 ... 93 % describes the rheology of the metal during hot deformation. The relationship between the components of the deformation rates and stresses is established, which allows to obtain a direct numerical solution of plastic deformation problems without FED iterative procedures, taking into account the real properties of the metal during deformation. As a result, the number of iterations and calculations has significantly decreased.
44 citations
Patent•
12 Feb 1973
TL;DR: In this article, a workpiece translation mechanism for moving successive workpieces through successive stations of a transfer stamping die is proposed. But the mechanism is not suitable for workpieces with a large number of workpieces.
Abstract: This invention relates to a workpiece translation mechanism for moving successive workpieces through successive stations of a transfer stamping die. Workpiece engaging mechanisms are provided on a top subframe which is mounted on an intermediate subframe for horizontal motion parallel to the path of the workpieces through the transfer die. The intermediate subframe is mounted on a bottom subframe for horizontal reciprocating movement transverse to the path of the workpieces. The bottom subframe is mounted for relative vertical reciprocating motions with respect to the bed of the transfer press. Appropriate mechanical driving arrangements are provided for both the top and intermediate subframes so that both horizontal movements are respectively accomplished with an harmonic acceleration and deceleration of the respective subframes so that they are at essentially zero velocity when they reach each extreme of their reciprocatory positions. In this manner, the possibility of the workpiece being inaccurately aligned with the station of the transfer stamping die is substantially minimized.
44 citations
TL;DR: In this article, the authors developed a completely new (and patented) regulation system to control the blank-holder pressure, working in closed-loop, the feedback-loop controlling the variation of the blankholder pressure can be based on several process parameters such as the punch force or the detection of the occurrence of wrinkling.
44 citations
TL;DR: In this paper, a general valid criterion for the limit strain is developed and FLDs for sheet steel determined by various experimental methods are compared, emphasizing the influence of the strain path on the forming limits.
44 citations
TL;DR: In this paper, a limited number of forming experiments were conducted with AA5754 aluminum sheets using a cylindrical punch and counteracting fluid at different temperatures and pressures, and the maximum draw depth prior to wrinkling or tearing was quantified through experimental and computational modeling.
43 citations