王德林,陆有根,吴兵.三销轴叉精整底部裂纹产生和防护[J].精密成形工程,2018,10(1):177-180.
WANG De-lin,LU You-gen,WU Bing.Generation and Avoiding of Cracks on Bottom of Tulip during Cold-forming[J].Journal of Netshape Forming Engineering,2018,10(1):177-180. |
| 三销轴叉精整底部裂纹产生和防护 |
| Generation and Avoiding of Cracks on Bottom of Tulip during Cold-forming |
| 投稿时间：2017-11-07 修订日期：2018-01-10 |
| DOI：10.3969/j.issn.1674-6457.2018.01.024 |
| 中文关键词: 三销轴叉 冷精整 裂纹 预成形 入模角 |
| 英文关键词: tulip cold-forming crack pre-forming entering die degree |
| 基金项目: |
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| 摘要点击次数: 4079 |
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| 中文摘要: |
| 三销轴叉精锻件是汽车等速传动系统中的关键零件，其头部内、外腔形状复杂，尺寸精度要求高，故一般采用温锻预成形+冷精整成形复合成形技术，而预成形温锻件设计不合理，在冷精整成形中，存在内腔底部薄壁处出现裂纹的问题。利用数值模拟技术，分析了三销轴叉冷精整型腔底部区域成形过程的成形力、应力、应变的变化，对预成形温锻件进行了优化，设计了不同的入模角，入模角的起始点位于内腔基准平面之上。工程实践后，优化后的预成形温锻件在冷整形后，口部内腔底部没有裂纹产生，流线连续，获得较为理想的精锻件。证明优化后的预成形温锻件，经冷精整成形后，精锻件产品质量显著提高，可有效防止裂纹产生。 |
| 英文摘要: |
| Tulip cold-forming forging part is a key component of constant velocity drive shaft of car. The process of this kind of part is combined forming with warm pre-forming and cold-forming due to the complexity of interior and exterior configuration and high dimension accuracy. There is often a crack on thin wall near bottom of interior configuration during Tulip cold-forming due to unoptimizable warm pre-forming part. The warm pre-forming part was optimized and different entering die degrees starting and ending in the interior base plate were designed by analyzing changes of forming force, stress and strain in forming of bottom of interior configuration during Tulip cold-forming with the numerical simulation technique. Engineering trial with improved pre-forming forging part has proved that the crack of bottom was avoided and the flow was continues. The improved warm pre-forming part via cold-sizing had high quality. The crack can be effectively prevented. |
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