刀具前角对超声复合加工成形切屑组织与性能的影响

doi:10.11896/cldb.22030291

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Abstract Ultrafine grained pure copper as an important basic material and functional material has become the current research hotspot of metal mate-rials. In this work, ultrasonic compound cutting was proposed to prepare ultrafine grained pure copper based on large strain extrusion machining. In UCC, the tool rake angle is the key factor affecting chip strain, grain size, dislocation density and properties. In order to study the effect of tool rake angles on the microstructure and properties of pure copper chip. A 3D Finite element analysis(FEM) model of ultrasonic compound cutting was established based on ABAQUS analysis software, and the change of equivalent strain, equivalent strain rate and cutting temperature in the shear deformation zone were analyzed. Single-factor tests were designed to analyze the effects of tool rake angle and ultrasonic vibration on chip microstructure, dislocation density and micro-hardness. The results show that:With the increase of tool rake angle, the equal strain and the cutting temperature gradually decrease, the equal strain rate first increases and then decreases. Compared with LSEM chip, the grain refinement degree and dislocation density of chip has be improved after adding ultrasonic vibration, and the hardness also increase by 5%. When the tool rake angle is 30°, the chip grain is refined from coarse grain to submicron elongated grain, and the macro-hardness is increased from 92.5HV to 131.8HV; when the tool rake angle is 15°, the grain is further refined into equiaxed fine grain, the dislocation density is 1.14×10¹³ m^-2 and the hardness is also increased to 184.3HV. At this time, the hardness of pure copper chips conforms to the Hall-Petch relationship.

Key words： tool rake angle ultrasonic compound cutting microstructure dislocation density hardness

Published: 10 September 2023 Online: 2023-09-05

CLC number:

TG506.5

Fund:Natural Science Foundation of Henan(202300410172), National Natural Science Foundation of China(52175399),and Key R & D and Promotion Project of Henan Province(212102210056).

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	SUN Haimeng
	NIU Ying
	JIAO Feng
	WANG Zhuangfei

Cite this article:

SUN Haimeng,NIU Ying,JIAO Feng, et al. Effect of Tool Rake Angle on Microstructure and Properties of Ultrasonic Compound Machining Formed Chip[J]. Materials Reports, 2023, 37(17): 22030291-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22030291 OR http://www.mater-rep.com/EN/Y2023/V37/I17/22030291

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