弹簧式快速落刀研究硬态42CrMo锯齿形切屑

中国机械工程 ›› 2016, Vol. 27 ›› Issue (03): 308-314.

弹簧式快速落刀研究硬态42CrMo锯齿形切屑

庆振华1,2;左敦稳1;杨海东2;雷小宝3;徐锋1

1.南京航空航天大学，南京，210016
2.合肥工业大学，合肥，230009
3.安徽大学，合肥，230601

出版日期:2016-02-10 发布日期:2016-02-03
基金资助:
国家自然科学基金资助项目（51005117，51575269）

Research on Hardened 42CrMo Saw-tooth Chip by Trial with Spring Type Quick-stop Device

Qing Zhenhua1;Zuo Dunwen1;Yang Haidong2;Lei Xiaobao3;Xu Feng1

1.Nanjing University of Aeronautics and Astronautics,Nanjing,210016
2.Hefei University of Technology,Hefei,230009
3.Anhui University，Hefei，230601

Online:2016-02-10 Published:2016-02-03
Supported by:

摘要/Abstract

摘要：

试验研究了硬态切削42CrMo（52HRC）中碳高强度合金结构钢锯齿形切屑形成过程。采用高速相机记录弹簧式快速落刀装置刀杆运动轨迹，计算落刀速度、加速度，定量分析该装置性能;在车床上直角自由切削盘状试样，以不同参数进行快速落刀试验，将获得的切屑根部制作成金相标本;考察“冻结”的切削区，着重考察剪切带上裂纹源、裂纹扩展以及绝热剪切带，分析锯齿形切屑形成过程。结果表明：裂纹源产生于自由表面，在切屑形成过程中向材料内部扩展，导致切屑分离的最终因素是裂纹扩展;硬态切削42CrMo切屑形成过程可划分为4个阶段。

关键词: 中碳高强度钢, 快速落刀装置, 硬态切削, 锯齿形切屑

Abstract:

Saw-tooth chip formation process was trial researched herein, on hard cutting of medium-carbon alloy structure 42CrMo(52HRC) high strength steel. Tool rod motion trajectory of QSD was recorded by a high-speed camera, the QSD's performance was quantitatively analyzed by calculating the velocity and acceleration. Orthogonal cutting QSD trial of disc sample was carried on lathe by cutting with different parameters, chip roots received were made into metallographic specimen; crack initiation, crack propagation and the adiabatic shear band at the stage of saw-tooth chip forming period were studied, saw-tooth chip forming process was also analyzed by observing the “breezed” cutting area. The results show that: crack initiation can be observed at the free surface, crack propagation expandes to cutting zone and eventually leads to the chip separation; the saw-tooth chip formation process of hard cutting high strength steel 42CrMo can be divided into four stages.

Key words: medium-carbon high strength steel, quick-stop device(QSD), hard cutting, saw-tooth chip

中图分类号:

TG501

庆振华, 左敦稳, 杨海东, 雷小宝, 徐锋. 弹簧式快速落刀研究硬态42CrMo锯齿形切屑[J]. 中国机械工程, 2016, 27(03): 308-314.

Qing Zhenhua, Zuo Dunwen, Yang Haidong, Lei Xiaobao, Xu Feng. Research on Hardened 42CrMo Saw-tooth Chip by Trial with Spring Type Quick-stop Device[J]. China Mechanical Engineering, 2016, 27(03): 308-314.

参考文献

[1]Tnshoff H K,Arendt C,Ben Amor R. Cutting of Hardened Steel[J]. CIRP Annals-Manufacturing Technology,2000 49(2): 547-566.

[2]Campbell F C. Manufacturing Technology for Aerospace Structural Materials[M].Oxford: Elsevier Science,2006.

[3]崔忠圻,覃耀春.金属学与热处理[M].2版.北京:机械工业出版社,2007.

[4]景璐璐,陈明,安庆龙. SKD11硬切削锯齿形切屑形成机理试验研究[J].中国机械工程,2014,25(23):3151-3154.

Jing Lulu, Chen Ming, An Qinglong. Experimental Study of Saw-tooth Chip Formation in Hard Cutting of SKD11[J]. China Mechanical Engineering, 2014,25(23):3151-3154.

[5]孟龙晖, 何宁, 李亮. TC4管状零件内壁加工残余应力计算及其有限元分析[J]. 中国机械工程, 2014, 25(19): 2583-2587.

Meng Longhui, He Ning, Li Liang. Calculation of Residual Stress Induced by Machining in Internal Surface of TC4 Tubular Parts and Its FEA[J]. China Mechanical Engineering, 2014, 25(19): 2583-2587.

[6]苏国胜.高速切削锯齿形切屑形成过程与形成机理研究[D].济南：山东大学,2011.

[7]段春争.正交切削高强度钢绝热剪切行为的微观机理研究[D].大连:大连理工大学,2005.

[8]Chinchanikar S, Choudhury S K. Machining of Hardened Steel—experimental Investigations, Performance Moldeling and Cooling Techniques: a Review[J]. International Journal of Machine Tools & Manufacture,2015,89:95-109.

[9]蔡光仁,檀美穗,吴惠贞,等.金属切削实验中快速落刀速度对切屑变形的影响[J].华侨大学学报自然科学版,1988,9(4):496-502.

Cai Guangren, Tan Meisui, Wu Huizhen,et al. Influence of the Speed of “Quick Stoppage”on Chip Deformation in the Metal-cutting Experiments[J]. Journal of Huaqiao University(Natural Science), 1988, 9(4): 496-502.

[10]杨海东,张崇高,邢庭元.一种车床快速落刀装置.中国,CN 1743106A[P].2006-03-08.

[11]李炯辉,林德成.金属材料金相图谱[M].北京:机械工业出版,2006.

[12]Schulz H,Abele E,何宁.高速加工理论与应用[M].北京:科学出版社,2010.

[13]Meng Longhui, He Ning, Yang Yinfei, et al. Method for Measuring Residual Stresses Induced by Boring in Internal Surface of Tube and Its Validation with XRD Method[J]. Transactions of Nanjing University of Aeronautics and Astronautics, 2014, 31(5): 508-514.

[14]陈日曜.金属切削原理[M].2版.北京:机械工业出版社,1994.

[15]Hartley K A，Duffy J,Hawley R H.Measurement of the Temperature Profile during Shear Band Formation in Steels Deforming at High Strain Rates[J].Mech. Phys. Solids，1987，35:283-301.