Research on Laser Crack-precontrolling Technology for 50SiMnVB

doi:10.3969/j.issn.1000-1093.2018.10.016

Abstract

Abstract: The cracks in 50SiMnVB steel are experimentally controlled by using high power CO₂ laser to improve the processing efficiency and subsequent processing of fracture splitting groove. The laser deeper melting zone of micro-structure, fracture morphology and micro-hardness distribution are analyzed by means of metallographic microscope, scanning electron microscope and micro-hardness tester, respectively. The numerical simulation software SYSWELD is used to simulate the distributions of temperature field and stress field in 50SiMnVB steel during laser deeper melting. The results show that the hardened brittle cracks are generated in the deeper melting zone due to temperature and stress gradient. The cracking mechanism is that the pores and micro-cracks arise at the bottom of the deeper melting zone, and the cracks expand along the center to form the macroscopic cracks. The optimal range of processing parameters is obtained by the experiment and simulation with laser power of 3.0 kW, and scanning speed of 1.0- 4.5 m/min. The corresponding depth range of prefabricated crack is about 3-7 mm. Key

Key words: splittingprocessing, laserpre-controlledcrack, micro-structure, fracturemorphology, micro-hardness, numericalsimulation

CLC Number:

TG665

SHI Yan, LIU Dong-wei, LIU Jia, LI Ling-yu. Research on Laser Crack-precontrolling Technology for 50SiMnVB[J]. Acta Armamentarii, 2018, 39(10): 1997-2005.

References

［1］ Zhang D, Harris S J, Mccartney D G, et al. The effect of laser transformation notching on the controlled fracture of a high carbon (C70S6) steel［J］. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2008, 489(1/2):273-284.
［2］寇淑清, 杨慎华, 赵庆华. 发动机连杆裂解加工初始裂纹槽几何参数研究［J］. 哈尔滨工业大学学报, 2007, 39(9):1487-1490.
KOU Shu-qing, YANG Shen-hua, ZHAO Qing-hua. Research on geometry parameters of stress-raising groove in fracture splitting processing of engine con-rod［J］. Journal of Harbin Institute of Technology, 2007, 39(9):1487-1490. (in Chinese)
［3］杨慎华, 张志强, 寇淑清. 连杆预制裂纹槽几何参数对胀裂力的影响［J］. 吉林大学学报:工学版, 2006, 36(2):195-198.
YANG Shen-hua, ZHANG Zhi-qiang, KOU Shu-qing. Influence of starting notch geometry parameters of connecting rod on its fracture splitting force［J］. Journal of Jilin University: Engineering and Technology Edition, 2006, 36(2):195-198. (in Chinese)
［4］杨慎华, 张志强, 寇淑清. 发动机连杆裂解加工关键技术的研究［J］. 内燃机工程, 2006, 27(5):80-84.
YANG Shen-hua, ZHANG Zhi-qiang, KOU Shu-qing. Study of key technology of fracture splitting of engine connecting rod［J］. Chinese Internal Combustion Engine Engineering, 2006, 27(5):80-84. (in Chinese)
［5］张志强, 郑祺峰, 赵勇, 等. 预制裂纹槽加工方法对连杆裂解加工质量的影响规律［J］. 内燃机工程, 2008,29(5):80-84.
ZHANG Zhi-qiang, ZHENG Qi-feng, ZHAO Yong, et al. Influence of machining methods on quality of connecting rod splitting process［J］. Chinese Internal Combustion Engine Engineering, 2008,29(5):80-84. (in Chinese)
［6］刘晓宁, 唐勇军, 张永俊. 电火花线切割加工连杆裂解槽技术研究［J］. 中国机械工程, 2010, 21(10):1240-1245.
LIU Xiao-ning, TANG Yong-jun, ZHANG Yong-jun. Research on the technology of connecting rod splitting groove by WEDM［J］. China Mechanical Engineering, 2010, 21(10):1240-1245. (in Chinese)
［7］ Kurz W, Fisher D J. 凝固原理［M］. 李建国, 胡侨丹, 译. 北京: 高等教育出版社，2010:1-10.
Kurz W, Fisher D J. Fundamentals of solidification［M］. LI Jian-guo, HU Qiao-dan, translated. Beijing: Higher Education Press, 2010: 1-10. (in Chinese)

［8］龚俊, 芮执元, 郎福元. 激光催裂的初步研究［J］. 甘肃工业大学学报, 1994, 20(4):44-48.
GONG Jun, RUI Zhi-yuan, LANG FU-yuan. Preliminary study of laser cracking［J］. Journal of Gansu University of Technology, 1994, 20(4):44-48. (in Chinese)

［9］石岩, 刘佳, 张宏. 30CrMnSi钢激光焊接工艺研究［J］. 兵工学报, 2010, 31(7):991-997.
SHI Yan, LIU Jia, ZHANG Hong. Research on laser welding of 30CrMnSi steel［J］. Acta Armamentarii, 2010, 31(7): 991-997. (in Chinese)

［10］朱晓英, 庄明辉, 姜春茂. 50SiMnVB壳体裂纹原因分析［J］. 精密成形工程, 2014, 6(2):51-54, 59.
ZHU Xiao-ying, ZHUANG Ming-hui, JIANG Chun-mao. Cause analysis for cracks in the 50SiMnVB shell［J］. Journal of Netshape Forming Engineering, 2014, 6(2):51-54, 59. (in Chinese)

第39卷
第10期2018 年10月兵工学报ACTA
ARMAMENTARIIVol.39No.10Oct.2018

[1]	WANG Ge， ZHANG Chun， LIN Zhiwei， WANG Baohua， TAN Hu， CHEN Chen. Research on's Opening Distance of AHEAD Ammunition [J]. Acta Armamentarii, 2022, 43(S1): 115-120.
[2]	L Dailong， CHEN Shaosong， XU Yihang， QIU Jiawei. Aerodynamic Characteristics of Close-coupled Canard Missile [J]. Acta Armamentarii, 2022, 43(6): 1316-1325.
[3]	WANG Danyu, NAN Fengqiang, LIAO Xin, XIAO Zhongliang, DU Ping, WANG Binbin. Effect of Flame Inhibitor of the Muzzle Flame of Large Caliber Gun [J]. Acta Armamentarii, 2022, 43(2): 273-278.
[4]	XU Gancheng, YUAN Weize, CHEN Linheng, LI Chengxue, XIE Xuhu, NIE Mengqi. Seismic Collapse Resitance of NFB700 High-strength Steel Plate [J]. Acta Armamentarii, 2022, 43(2): 391-400.
[5]	LU Kuan， RAO Xiang， WANG Huamei， ZHANG Qian. The Influences of Different Mooring Systems on the Hydrodynamic Performance of Buoy [J]. Acta Armamentarii, 2022, 43(1): 120-130.
[6]	CHENG Shenshen, TAO Ruyi, WANG Hao, XUE Shao, LIN Qingyu. Dampling Characteristics of Projectile in Engraving Process of Nylon Sealing Band [J]. Acta Armamentarii, 2021, 42(9): 1847-1857.
[7]	GUAN Dian, LI Shipeng, LIU Zhu, WANG Ningfei. Influence of Lateral Acceleration on Ignition Transients of Solid Rocket Motor [J]. Acta Armamentarii, 2021, 42(9): 1877-1887.
[8]	WANG Danyu, NAN Fengqiang, LIAO Xin, XIAO Zhongliang, DU Ping, WANG Binbin. Characteristics of Muzzle Flow Field of Large Caliber Gun Considering Chemical Reaction [J]. Acta Armamentarii, 2021, 42(8): 1624-1630.
[9]	TAN Meijing， YANG Guang， LI Yu， ZHOU Yu， CAO Zhanwei， YAN Hao， TAN Zijing. Influence of Rectifying Wedge on the Flow Structure and Aerodynamic Heating Environment around All-movable Rudder [J]. Acta Armamentarii, 2021, 42(8): 1648-1659.
[10]	CHENG Yuansheng， XIE Jieke， LI Zhe， LIU Jun， ZHANG Pan. Damage Response Characteristics of UHMWPE/aluminum Foam Composite Sandwich Panel Subjected to CombinedBlast and Fragment Loadings [J]. Acta Armamentarii, 2021, 42(8): 1753-1762.
[11]	GAO Feng, ZHANG Ze. Review on Performance Evaluation of Solid Rocket Motors with Charge Defects [J]. Acta Armamentarii, 2021, 42(8): 1789-1802.
[12]	LIU Qingyang, LEI Juanmian. Numerical Simulation of Aerodynamic Interference of Close-coupled Highly Swept-back Wings at Transonic Velocity [J]. Acta Armamentarii, 2021, 42(7): 1412-1423.
[13]	DU Huachi， ZHANG Xianfeng， LIU Chuang， XIONG Wei， LI Pengcheng， CHEN Haihua. Trajectory Characteristics of Projectile Obliquely Penetrating into Steel Target with Multi-layer Space Structure [J]. Acta Armamentarii, 2021, 42(6): 1204-1214.
[14]	WANG Mengxin， CHEN Ruiying， WANG Jinxiang. Protective Properties of Porous Foam Aluminum Sandwich Composite Plate under the Combined Action of Fragment and ShockWave [J]. Acta Armamentarii, 2021, 42(5): 1041-1052.
[15]	TONG Ding, TIAN Hongyan, LIU Xinyuan, LIU Ye, GAO Chao, LI Xin. Effect of Inlet Bend Pipe on the Centrifugal Compressor Performance and Its Optimization Design [J]. Acta Armamentarii, 2021, 42(4): 706-714.