한국정밀공학회지 제6권 제1호 (1989년 3월)
Journal of the Korean Society of Precision Engineering Vol.6, No.1, March 1989
티타늄의 切削性에 관한 硏究
-chip의 形成機構를 중심으로-
洪煥杓*, 吳錫炯**, 徐南燮
A Study on the Machinability of Titanium
Hong Hwan Pyo*, Oh Seok Hyung**, Seo Nam Seob**
ABSTRACT
In metal cutting various types of chips are produced in consequence of cutting conditions.
According to the types of chips the cutting mechanism is to be changed. Most of the cutting theory is
based on the continuous chip because of its convenient analysis, but the occurrence of the saw-toothed
chip depends upon the workpiece and/or the cutting conditions, one of which is titanium alloy used
widely.
Nowadays titanium alloys are used widely with the rapid development of aerospace structural
engineering application, whereas the theory of cutting mechanism has not been estsblished yet, and the
formatting process has not been understood satisfactorily, either. Unfortunately several misconceptions,
conflicting statemens and statements needing further clarification are also found.
In this paper an attempt is made to clarify the formation prorocess of sawt-toothed chips which are
to be produced during the orthogonal cutting process of titanium alloys.
They were machined at low speed to avoid the rapid tool wear. We observed the SEM-photographs
of chips taken at the quick-stopping device.
It is hoped that a rational model of the mechanics of cyclic chip formation can be developed. The
results obtained are as follows.
1. When a saw-toothed chip is formed, the shear band begins at the primary shear zone and transfers
to the free surface, so that a segment is produced and it is completed by upsetting between the
formatting segment and the formatted segment.
2. As the rake angle or the clearance angle increases in the machining of the titanium alloy, the chip
approaches to that of the continious type.
3. When the rake angle and the clearance angle are increased the shear energy and the unit friction
energy decrease, which shows the same aspect as that of the continuous chip.
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