Transactions of Materials and Heat Treatment

Title：Cause analysis and improvement on forging crack in water pump plier handle

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ClassificationCode：TG316

year,vol(issue):pagenumber：2024,49(1):32-37

Abstract：

The final forging arrangement of two pieces in one mold was used to produce a certain water pump plier, but cracks are found on the handle during the forging process. Therefore, in order to intuitively analyze the cause of the crack, a certain section of the handle was taken and analyzed by finite element simulation. The results show that the crack is a crack penetrating the ribs which is caused by the unreasonable pre-forging design of handle. That is, during the forging process, after the ribs on both sides of handle forgings are completely filled, there is still a lot of material in the middle web part. When the die forging continues, the excess material in the middle web part flows to the ribs on both sides at an extremely fast speed under the action of forging hammer to crack the forgings. Based on this, the pre-forging cavity is re-improved so that during the final forging, when the ribs are fully filled, there is as little material as possible in the middle web part. The finite element analysis shows that by reducing the height of wider ribs from 9 mm to 8 mm, and the height of narrow ribs from 9 mm to 6 mm, the defects of crack penetrating the ribs can be better eliminated. The improved results are verified in production and there is no crack problem in the handle of forgings. By improving the pre-forging cavity, the crack penetrating the ribs in the handle of water pump pliers are eliminated.

Funds：

国家自然科学基金资助项目(52075278);山东省自然科学基金资助项目(ZR2022ME193)

作者简介：王延辉(1998-)，男，硕士研究生 E-mail：wyh20200228@163.com 通信作者：程联军(1974-)，男，博士，副教授 E-mail：chenglianjunwp@163.com

Reference：

[1] 陈荣创，吕镓均. 汽车高强钢锻件淬火开裂分析与有限元模拟 [J]. 锻压技术，2023，48（9）：7-14.

Chen R C，Lyu J J. Analysis and finite element simulation on quenching cracking for automotive high-strength steel forgings [J]. Forging & Stamping Technology，2023，48(9): 7-14.

[2] 俞汉青，陈金德. 金属塑性成形原理[M]. 北京：机械工业出版社，1999.

Yu H Q，Chen J D. Principle of Metal Plastic Forming[M]. Beijing: China Machine Press，1999.

[3] 胡晓雅，王显会，黄理，等. 铸铝自冲铆接接头裂纹扩展行为研究及仿真预测 [J]. 锻压技术，2023，48（9）：113-118.

Hu X Y，Wang X H，Huang L，et al. Research and simulation prediction on crack propagation behavior for cast aluminum self-piercing riveting joints [J]. Forging & Stamping Technology，2023，48(9): 113-118.

[4] 耿曌杰，高玉周，詹明，等. SUS430F不锈钢轴冷拔加工开裂机理 [J]. 锻压技术，2023，48（2）:142-148.

Geng Z J，Gao Y Z，Zhan M，et al. Cracking mechanism on SUS430F stainless steel shaft by cold drawing process [J]. Forging & Stamping Technology，2023，48(2): 142-148.

[5] 赵宁，兰箭，张运军，等. V5 型转向节臂部锻造开裂研究 [J]. 塑性工程学报，2017，24（3）：7-12.

Zhao N，Lan J，Zhang Y J，et al. Arm forging crack of V5 type steering knuckle [J]. Journal of Plasticity Engineering，2017，24(3): 7-12.

[6] 哈曜，徐加银，陈琳，等. 4140圆管锻件热处理裂纹检验分析[J]. 物理测试，2017，35（6）：38-42.

Ha Y，Xu J Y，Chen L，et al. Inspection and analysis of the heat treatment cracks of 4140 round tube forging [J]. Physics Examination and Testing，2017，35(6): 38-42.

[7] Guo W M，Xu N，Ding N，et al. An analysis of crack evolution of a 12Cr13 stainless steel during forging process [J]. Case Studies in Engineering Failure Analysis，2015，4: 94-99．

[8] 罗曼. 某飞机钛合金梁接头锤上模锻与液压模锻方案对比研究 [D]. 重庆：重庆大学，2019.

Luo M. Contrastive Study on Hammer Die Forging and Hydraulic Die Forging for Titanium Alloy Beam Joint of an Aircraft [D]. Chongqing: Chongqing University，2019.

[9] 夏华，柯林辉，王洪强. 水泵钳小飞边模锻工艺优化研究[J]. 金属铸锻焊技术，2011，40（13）：82-86.

Xia H，Ke L H，Wang H Q. Optimization of small-flash die-forging process for water pump plier [J]. Metal Casting and Forging Welding Technology，2011，40(13): 82-86.

[10]吴道祥，周杰，张建生，等. 7050铝合金航空锻件热锻成形穿流缺陷分析[J]. 华中科技大学学报：自然科学版，2015，43（4）：69-73.

Wu D X，Zhou J，Zhang J S，et al. Analyzing partial draining of 7050 aluminum alloy aircraft forging after hot die forming [J]. Journal of Huazhong University of Science and Technology: Natural Science Edition，2015，43(4): 69-73.

[11]王庆亮，刘科研，由明扬，等. 铝合金多筋圆盘形模锻件穿流缺陷分析[J]. 轻合金加工技术，2012，40（8）：58-60.

Wang Q L，Liu K Y，You M Y，et al. Alternate flow defect analysis of die forged aluminum alloy disk with ribs [J]. Light Alloy Fabrication Technology，2012，40(8): 58-60.

[12]徒延萍. 模锻件流线穿流的形成原因及预防方法 [J]. 西安航空技术高等专科学校学报，2008，26（3）：12-13.

Tu Y P. Formation reason and prevention method of streamline flow in die forging parts [J]. Journal of Xi′an Aero Technical College，2008，26(3): 12-13.

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