高碳钢轴对称空心工件特殊型材基体的热压接

V. Kaliuzhnyi, S. Sytnyk, Аndrii Titarenko
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引用次数: 0

摘要

利用有限元方法建立了数学模型,并对壁厚沿高度变化的高碳钢空心工件特殊型材基体中的直接和反向热压接方法进行了研究。使用金属和圆柱坐标的塑性模型。通过计算,确定了压接初始工件的形状和尺寸,从而提供了产品所需的尺寸。在压接之前,坯料的一部分沿着高度被加热,其在基体中发生变形。由于在成形过程中摩擦力的影响减少,使用具有由环形突起制成的变形表面的特殊轮廓的基体使得可以在一个步骤中获得产品。变形率被确定为在压接期间符合热变形模式。建立了变形工具上的轴向力与冲头运动的关系以及接触表面上的比力分布。直接压接的使用导致力模式和工具上的特定力的减少。确定了金属的最终应力-应变状态、产品的形状和尺寸。根据应变强度的分布,对塑性变形对金属结构的细化进行了评价。基于仿真数据,开发了直接压接模具的总体视图设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hot crimping in a special profile matrix of axisymmetric hollow workpieces from high carbon steel
Using the finite element method, mathematical models were created and studies were carried out of direct and reverse methods of hot crimping in a matrix of a special profile of hollow workpieces made of high-carbon steel with a variable wall thickness along the height. A plastic model of metal and cylindrical coordinates are used. By calculation, the shape and dimensions of the initial workpiece for crimping were established, which provided the required dimensions of the product. Before crimping, a part of the billet was heated along the height, which was subject to deformation in the matrix. The use of a matrix of a special profile with a deforming surface made with annular protrusions made it possible to obtain a product in one step due to a decrease in the influence of friction forces during shaping. The deformation rate is determined to comply with the hot deformation mode during the crimping. The dependences of the axial force on the deforming tool on the movement of punches and the distribution of specific forces on the contact surfaces are established. The use of direct crimping leads to a decrease in forces modes and specific forces on the tool. The final stress-strain state of the metal, the shape and dimensions of the product are determined. According to the distribution of strain intensity, an assessment was made of the elaboration of the metal structure by plastic deformation. Based on the simulation data, a design of the general view of the die tooling for direct crimping has been developed.
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