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<p>The effects of initial temperatures of 150, 250, and 350&#xa0;°C for molds and initial temperatures of 400, 600, and 800&#xa0;°C for billets on equivalent material stress, equivalent strain, and forming load during deformation were studied. The analysis results showed when the initial temperature of the mold was 350&#xa0;°C, the minimum equivalent stress and the equivalent strain of the billet and its forming load decreased with the increase in forming temperature. In order to ensure the accuracy of the deformation temperature, a temperature control device based on the fuzzy PID algorithm was designed to reduce the time lag of the heat conduction process through the time-shift function. The analysis results showed that the steady-state error was 0&#xa0;°C and the response time was halved. The experimental results showed that when the initial mold temperature was 350&#xa0;°C and the material deformation temperature was 400, 600, and 800&#xa0;°C, respectively, the coarse original grains were significantly refined after extrusion. When the material temperature was 400&#xa0;°C, the average grain size decreased from 46 to 3-5&#xa0;μm with a small amount of deformation twinning in the fine grains, the billet microhardness increased from 209.4 to 272.9&#xa0;HV, and the tensile strength was increased from 443.31 to 615.24&#xa0;MPa.</p>

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Study on the Equal Diameter Angle Extrusion Process of Titanium Alloy Based on Fuzzy System Temperature Control

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Jun Zhao,
  • Qingsong Niu,
  • Haojie Xu

摘要

The effects of initial temperatures of 150, 250, and 350 °C for molds and initial temperatures of 400, 600, and 800 °C for billets on equivalent material stress, equivalent strain, and forming load during deformation were studied. The analysis results showed when the initial temperature of the mold was 350 °C, the minimum equivalent stress and the equivalent strain of the billet and its forming load decreased with the increase in forming temperature. In order to ensure the accuracy of the deformation temperature, a temperature control device based on the fuzzy PID algorithm was designed to reduce the time lag of the heat conduction process through the time-shift function. The analysis results showed that the steady-state error was 0 °C and the response time was halved. The experimental results showed that when the initial mold temperature was 350 °C and the material deformation temperature was 400, 600, and 800 °C, respectively, the coarse original grains were significantly refined after extrusion. When the material temperature was 400 °C, the average grain size decreased from 46 to 3-5 μm with a small amount of deformation twinning in the fine grains, the billet microhardness increased from 209.4 to 272.9 HV, and the tensile strength was increased from 443.31 to 615.24 MPa.