Research on shaping of burr less gear by cold extrusion through reducing after expansion workpiece diameter

扩径后缩径冷挤压无毛刺齿轮成形研究

• 批准号: 20560104
• 负责人: YOSHIDA Hajime
• 金额: $ 2.91万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20560104/
• 关键词: 成形加工; 冷間押出し; 平歯車; はすば歯車; 内歯車; 鍛流線; 押出し; 歯車

When extruding a gear while confining the outer diameter of the workpiece, burr-like irregularities occur on the end surface of the shaped form although the pressure(load) is low. When extruding a gear while expanding the inner diameter of the workpiece, the irregularities on the end surface become smaller but the load becomes greater. A shaping experiment was conducted in this study to take the respective advantages of the above two approaches by adopting a procedure of extrusion after expansion. The intention was to obtain a shaped form having small burr-like irregularities with a low load, and eventually produce gears using only a press lineFirst, it was found possible to form gears using the above method. The lower limit of cross sectional reduction in area to obtain a favorable gear was determined. The needed pressure of the punch, mandrel, and die is far below the strength of the punch, mandrel, and die materials. The burr-like irregularities on the end surface could be reduced in size compared with the two-step extrusion method, which has been proposed for gear shaping, but could not be eliminated completelyIt was found that the irregularities could be rectified with a press machine because of their reduced size

当在限制工件外径的同时挤压齿轮时，尽管压力（载荷）低，但在成形形式的端面上出现毛刺状的不规则性。当在扩大工件的内径的同时挤压齿轮时，端面上的不规则性变小，但载荷变大。为了发挥两种方法的各自优点，采用先膨胀后挤压的工艺进行了成型实验。其目的是在低载荷下获得具有小毛刺状不规则性的成形形式，并最终仅使用冲压线生产齿轮。首先，发现可以使用上述方法形成齿轮。确定了获得有利齿轮的横截面积减小的下限。冲头、芯轴和冲模所需的压力远低于冲头、芯轴和冲模材料的强度。11与两步挤压法相比，端面上的毛刺状不规则尺寸可以减小，但不能完全消除，发现由于尺寸减小，可以用压力机矫正。

项目成果

塑性変形を利用した異種金属の接合III

利用塑性变形连接异种金属 III

• 发表时间: 2008
• 作者: 伊東聡;岩田太;中尾秀信;七里元晴;吉田始,沢木洋三,坂井田喜久,神尾恒春,磯谷章
• 通讯作者: 吉田始,沢木洋三,坂井田喜久,神尾恒春,磯谷章

Shaping of Helical Gear by Two-Step Cold Extrusion

斜齿轮的两步冷挤压成形

• 发表时间: 2008
• 期刊: MATERIALS TRANSACTIONS
• 影响因子: 1.2
• 作者: Hajime Yoshida;Yozo SAWAKI
• 通讯作者: Yozo SAWAKI

スプライン穴付き歯車の冷間成形II

带花键孔齿轮的冷成形II

• 发表时间: 2011
• 作者: 吉田始,坂井田喜久,矢代茂樹,磯谷章;宮内太積;神尾恒春
• 通讯作者: 神尾恒春

塑性変形を利用した接合法の開発II

利用塑性变形的连接方法的开发II

• 发表时间: 2010
• 作者: 吉田始;坂井田喜久;中村保;早川邦夫;磯谷章,神尾恒春
• 通讯作者: 磯谷章,神尾恒春

Influence of Crack Face Bridging Stress and Microstructure on Fracture Toupimpss of Toughened Alumina Ceramics

裂纹面桥接应力和微观结构对增韧氧化铝陶瓷断裂性能的影响

• 发表时间: 2011
• 期刊: Key Engineering Materials
• 作者: Yoshihisa Sakaida;Hajime Yoshida;Shotaro Mori
• 通讯作者: Shotaro Mori