Simulation-Assisted Production of Stainless Steel Fasteners Using Pre-Deformed Raw Material by Cold Forging Method

Alper Baygut, O. Çulha, T. Yağcı
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引用次数: 1

Abstract

The initial properties of the raw material used while producing by cold forging change the mechanical properties of the final product resulting from deformation. Depending on the amount and speed of deformation, there is an increase in strength and a decrease in formability after cold forging on the basis of the true stress - strain curve of the material. In this study, pre-deformation of 304Cu (1.4567) quality raw material used to produce fasteners in A2-70 class by wire drawing before forging and the change of the mechanical properties of the raw material, on the basis of this change, the simulation supported design of the fastener mold and process was carried out. Simufact.forming software was used in cold forging simulation studies. According to the simulation data, the yield strength value increased from 215 MPa to 620 MPa as a result of thinning the raw material from Ø7.80 mm to Ø6.95 mm with wire drawing operation. In this case, the properties of the raw materials entering the cold forging have changed according to the deformation percentage amount, and the material properties and mold design used in the finite element simulation supported production were made according to this data. As a result of the use of this raw material in the cold forging simulation, the HV10 hardness value in the fastener head region, where deformation is intense on the basis of the die geometry, has reached the levels of 320 to 340 HV. Material flow lines, product dimensional tolerances, rolling and thread cutting processes during deformation were verified in the computer environment and physical product production was made. Hardness, strength and structural checks were performed and compared with numerical model values. Especially, the changing material properties as a result of the wire drawing process applied to the starting raw material and its effect on cold forging were investigated mechanically and metallographically.
预变形原料冷锻法模拟辅助生产不锈钢紧固件
冷锻生产时所用原材料的初始性能由于变形而改变了最终产品的力学性能。根据材料的真实应力-应变曲线,根据变形量和速度的不同,冷锻后强度增加,成形性降低。本研究对用于生产A2-70级紧固件的304Cu(1.4567)优质原材料在锻压前进行预变形及原材料力学性能的变化,在此变化的基础上,进行了紧固件模具及工艺的仿真支持设计。Simufact。采用成形软件进行冷锻仿真研究。模拟数据表明,采用拉丝工艺将原材料从Ø7.80 mm减薄到Ø6.95 mm,使屈服强度值从215 MPa提高到620 MPa。在这种情况下,进入冷锻的原材料的性能根据变形百分比量发生了变化,并根据该数据进行了有限元模拟支撑生产中使用的材料性能和模具设计。由于在冷锻模拟中使用了这种原材料,在模具几何形状的基础上变形强烈的紧固件头部区域的HV10硬度值已达到320至340 HV的水平。在计算机环境下对变形过程中的物料流线、产品尺寸公差、轧制和螺纹切削工艺进行了验证,并进行了实物生产。进行了硬度、强度和结构校核,并与数值模型值进行了比较。着重从力学和金相方面研究了拉丝工艺对坯料性能的影响及其对冷锻件性能的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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