冯阳阳,李洪周,张文广,等.先进高强度双相钢弯扭复合回弹评价与试验研究[J].精密成形工程,2023,15(5):79-87.
FENG Yang-yang,LI Hong-zhou,ZHANG Wen-guang,et al.Evaluation and Test for Bending-twist Compound Springback of Advanced High-strength Dual Phase Steel[J].Journal of Netshape Forming Engineering,2023,15(5):79-87. |
| 先进高强度双相钢弯扭复合回弹评价与试验研究 |
| Evaluation and Test for Bending-twist Compound Springback of Advanced High-strength Dual Phase Steel |
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| DOI：10.3969/j.issn.1674-6457.2023.05.010 |
| 中文关键词: 双相钢 弯扭复合回弹 评价指标 三点弯曲试验 |
| 英文关键词: dual phase steel bending-twist compound springback evaluation index three-point bending test |
| 基金项目:国家自然科学基金(51605158);湖南省教育厅科学研究重点项目(21A0300) |
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| 中文摘要: |
| 目的 针对先进高强度双相钢冲压成形后回弹量大且多种回弹形式相互作用的问题，提出弯曲–扭曲复合回弹试验评价指标与测试方法，研究双相钢强度级别和试验条件对弯扭回弹的影响规律。方法 建立板料回弹前后的几何关系，提出弯扭复合回弹评价指标，通过改变三点弯曲试验上压杆的偏转角度，开展弯扭复合回弹试验。结果 基于合理的几何关系假设提出的评价指标适用于弯扭复合回弹试验结果分析。当上压杆偏转角度为0°时，强度越高，板料弯曲回弹越明显，回弹后横截面顶点距离和2条对角线长度变化越小;随着上压杆偏转角度的增加，当上压杆偏转0°~15°时，不同强度的3种试件(DP600、DP780、DP980)的横截面顶点距离和2条对角线长度增大，其中DP600试件的横截面顶点距离变化最小;当上压杆偏转15°~45°时，3种试件共同表现出横截面顶点距离减小、一条对角线长度减小、另一条对角线长度增加，其中DP980试件的对角线长度之差最小。结论 试验数据与分析结果表明，调整三点弯曲试验中上压杆的偏转角度可以诱发不同的扭曲回弹量，进而有效控制弯曲回弹与扭曲回弹的复合程度。分别利用板料横截面顶点距离变化及2条对角线长度变化评价弯曲回弹和扭曲回弹程度，利用二者综合评价弯扭复合回弹程度。板料的扭曲回弹受板料强度制约进而影响弯曲回弹程度。 |
| 英文摘要: |
| The work aims to propose an evaluation index and test method for bending-twist compound springback and study the effect of material strength and test conditions of dual phase steel on bending-twist compound springback, so as to solve the issue of large springback amount and the interaction of various springback forms in forming of advanced high-strength dual phase steel. The geometric relationship between pre-springback and post-springback of sheet metal was established, and the index evaluation of bending-twist compound springback was put forward. Then the bending-twist compound springback test was carried out by deflecting the upper press bar with a certain angle in the three-point bending test. The evaluation index proposed based on the geometric model under reasonable assumption was suitable for data analysis of the bending-twist compound springback test. When the deflection angle of the upper press bar was 0°, the higher the strength, the more obvious the bending springback of the sheet metal, and the smaller the distance between the vertexes of the cross section line and the two diagonal lengths after springback. For three specimens with different material strength (DP600, DP780, DP980), the distance between the vertexes of the cross section line and the two diagonal lines lengths increased with the increase of the deflection angle of the upper press bar from 0° to 15°, among which the change of distance between the vertexes of the cross section line for DP600 was the least. As the upper press bar deflected from 15° to 45° for three different material strength specimens test, the distance between cross section vertices decreased. The length of one diagonal decreased and the length of the other diagonal increased, among which the length difference between specimen diagonals for DP980 was the smallest. The test data and analysis results show that adjusting the deflection angle of the upper press bar in the three-point bending test could induce different amount of twist springback, thus effectively control the degree of combination of bending springback and twist springback. The amount of bending springback and twist springback are evaluated by the changes of the distance between the vertexes of cross section and the lengths of two diagonals, respectively, and the compound degree of bending and twist springback is comprehensively evaluated. The twist springback of sheet metal is limited by the material strength of sheet metal and then affect the degree of bending springback. |
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