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一、金属流动的控制拉延成形的过程是金属的流动,工件厚度的变化是金属流动的结果,而工件的起皱和破裂源于厚度变化。所以,分析处理拉延件的起皱和破裂必须考虑金属流动的控制。控制金属流动,基本上归结于开流和限流。在需要金属流动时减小变形阻力,这是开流。当需要金属流动而变形阻力过大时,工件就会变薄,其极限状态则是破裂。在不需要金属流动时增大变形阻力,这是限流。当不需要金属流动而变形阻力过小时,工件就积聚起皱。判断金属流动的方向,必须分析工件各变形区内变形的方式是伸长变薄抑或缩短变厚,
First, the control of metal flow Drawing forming process is the flow of metal, the thickness of the workpiece changes the result of the flow of metal, and the workpiece wrinkles and rupture stems from changes in thickness. Therefore, analysis of the wrinkling and rupturing of the drawn parts must take into account the control of the metal flow. Control of metal flow, basically due to open and current limiting. Decreasing the deformation resistance when metal flow is needed, this is open flow. When the metal flow is required and the deformation resistance is too high, the workpiece will become thinner and its ultimate state will be broken. Increased deformation resistance when metal flow is not needed, which is the current limit. When the metal flow is not required and the deformation resistance is too small, the workpiece accumulates wrinkles. To determine the direction of metal flow, we must analyze the deformation of the workpiece within the deformation zone is thinning or shortening the thickness of the shortening,