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首页> 外文期刊>Journal of Manufacturing Processes >A novel multi-step strategy of single point incremental forming for high wall angle shape
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A novel multi-step strategy of single point incremental forming for high wall angle shape

机译：高壁角形状单点增量成型的新型多步策略

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摘要

Single point incremental forming (SPIF) is a die-less manufacturing technology using a numerical controlling system for complex and customized parts. However, single-step SPIF cannot achieve high wall angle shapes due to the formability limit of the material. As wall angle gets larger, local thinning becomes severe, and cracking occurs easily. Generally, a multi-step strategy is used to get a hard-to-form deep drawing shape. However, inappropriate multi-step strategies can cause a stepped feature (corrugation). In this study, a novel parameterized multi-step strategy is proposed to solve the local thinning and stepped feature issues of forming high wall angle shape. Both experimental and simulation results showed this strategy not only improves the formability of a high wall angle, by avoiding over-thinning in the local region and redistributing the thickness of the material, but also minimizes geometric deviation by stepped feature. The multi-step strategy made the local thickness increase from 0.47 mm to 0.68 mm, preventing both cracking observed in a single-step strategy and the occurrence of the stepped feature. With the good agreement between experimental and simulation results, simulations with different parameters in a parameterized multi-step strategy were carried out to compare thickness distribution at each step, the stepped feature at the bottom and the ductile failure tendency. The comparison reveals that the locally large plastic strain, which was caused by the mismatch between the tool radius and vertical displacement, is the main reason for uneven thickness distribution, obvious stepped feature, and high failure tendency. With appropriate parameters, a multi-step strategy results in a more uniform thickness distribution, higher geometric accuracy, and lower failure tendency.
机译：单点增量成型（SPIF）是一种模糊制造技术，用于复杂和定制部件的数值控制系统。然而，由于材料的可成形性极限，单步SPIF不能实现高壁角形状。随着壁角变大，局部变薄变得严重，并且容易发生开裂。通常，使用多步策略来获得难以形成的深层绘图形状。但是，不适当的多步策略可能导致步进功能（波纹）。在本研究中，提出了一种新颖的参数化的多步策略，以解决形成高壁角形状的本地变薄和阶梯特征问题。实验和仿真结果表明，该策略不仅通过避免在局部区域中的过度减薄并重新分配材料的厚度，而且还通过阶梯特征来最小化几何偏差来提高高壁角的可成形性。多步策略使局部厚度从0.47毫米增加到0.68毫米，防止在单步策略和阶梯特征的发生中观察到两个开裂。通过实验和仿真结果之间的良好一致性，在进行参数化的多步策略中的模拟以比较每个步骤的厚度分布，底部的步进特征和延性失效趋势。比较揭示了局部大的塑性菌株，这是由刀具半径和垂直位移之间的不匹配引起的，是厚度分布，明显的阶梯特征和高失效倾向的主要原因。利用适当的参数，多步策略导致更均匀的厚度分布，更高的几何精度和更低的故障趋势。

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  • 来源
    《Journal of Manufacturing Processes》 |2020年第8期|697-706|共10页
  • 作者

    Wu Song; Ma Yunwu; Gao Leitao; Zhao Yixi; Rashed Sherif; Ma Ninshu;

  • 作者单位

    Osaka Univ Joining & Welding Res Inst 11-1 Mihogaoka Ibaraki Osaka 5670047 Japan|Grad Sch Engn Dept Global Architecture Div Naval Architecture & Ocean Engn Suita Osaka 5650871 Japan;

    Osaka Univ Joining & Welding Res Inst 11-1 Mihogaoka Ibaraki Osaka 5670047 Japan;

    Shanghai Jiao Tong Univ Shanghai Key Lab Digital Mfg Thin Walled Struct Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Shanghai Key Lab Digital Mfg Thin Walled Struct Shanghai 200240 Peoples R China;

    Osaka Univ Joining & Welding Res Inst 11-1 Mihogaoka Ibaraki Osaka 5670047 Japan;

    Osaka Univ Joining & Welding Res Inst 11-1 Mihogaoka Ibaraki Osaka 5670047 Japan|Grad Sch Engn Dept Global Architecture Div Naval Architecture & Ocean Engn Suita Osaka 5650871 Japan;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Incremental forming; Multi-step strategy; Aluminum alloy; Thickness distribution; Stepped feature;

    机译：增量成形;多步策略;铝合金;厚度分布;步进功能;

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