| 引用本文: | 崔晓磊,韩聪,苑世剑.加载条件对内高压成形管件尺寸精度的影响[J].材料科学与工艺,2020,28(3):150-156.DOI:10.11951/j.issn.1005-0299.20200066. |
| CUI Xiaolei,HAN Cong,YUAN Shijian.Effect of loading conditions on dimension accuracy of hydroformed tubular parts[J].Materials Science and Technology,2020,28(3):150-156.DOI:10.11951/j.issn.1005-0299.20200066. |
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| 摘要: |
| 为了研究内高压成形管件横截面尺寸变化规律,获得管件横截面尺寸精度的调控方法,采用内高压成形实验研究了内压和合模力加载条件对低碳钢变径管直径尺寸精度的影响规律。结果表明:随着内压从60 MPa增加到210 MPa,变径管直径逐渐增加,卸压出模后管件发生0.045%~0.075%的回弹,当内压为150 MPa时,获得的管件直径尺寸精度最高。随着合模力增加,变径管水平方向的直径尺寸逐渐增大,竖直方向的直径尺寸逐渐减小,横截面不圆度增大,导致尺寸精度降低。因此,在内高压成形中,可通过增加模具尺寸或采用可变合模力加载以降低合模力对管件横截面尺寸精度的影响,也可通过控制内压使模具弹性变形量恰好等于管件回弹量,从而使管件最终直径尺寸等于设计值,以保证管件的横截面尺寸精度。 |
| 关键词: 内高压成形 尺寸精度 内压 合模力 变径管 |
| DOI：10.11951/j.issn.1005-0299.20200066 |
| 分类号:TG394 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51805357, 51775136). |
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| Effect of loading conditions on dimension accuracy of hydroformed tubular parts |
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CUI Xiaolei1,2, HAN Cong1,2, YUAN Shijian1,2
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(1. National Key Laboratory for Precision Hot Processing of Metals (Harbin Institute of Technology), Harbin 150001, China; 2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
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| Abstract: |
| To investigate the cross-sectional dimension variation of hydroformed tubular parts and obtain the method for controlling dimension accuracy, the effects of internal pressure and clamping force loading conditions on diameter dimension accuracy of a low carbon steel tubular part with variable-diameter were studied by using hydroforming experiments. Results show that the diameter of the variable-diameter tubular part gradually increased with the increase of the internal pressure from 60 MPa to 210 MPa. After unloading and removing the tubular part from the die cavity, a certain springback of 0.045%~0.075% occurred on the tubular part. When the internal pressure was 150 MPa, the diameter dimension of the obtained tubular part had the highest accuracy. Moreover, with the increase of the clamping force, the diameter of the tubular part in the horizontal direction increased gradually while the diameter in the vertical direction decreased gradually, and the ovality of the cross-section increased, which deteriorated the cross-sectional dimension accuracy. Thus, the negative influence of clamping force on the cross-sectional dimension accuracy of tubular parts can be minimized by increasing the die size or adopting variable clamping force loading in hydroforming process. The cross-sectional dimension accuracy of tubular parts can be guaranteed by controlling the internal pressure to ensure that the elastic deformation of the die is exactly equal to the springback of the tubular part, and thereby the final diameter of the tubular part is equal to the design value. |
| Key words: hydroforming dimension accuracy internal pressure clamping force variable-diameter tubular part |
