PSI - Issue 32

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T.V. Lomaeva et al. / Procedia Structural Integrity 32 (2021) 295–298 Lomaeva / Structural Integrity Procedia 00 (2019) 000–000

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Considering the above, experimental studies of the influence of the feed rate on the amount of chip shrinkage were carried out. In the process of research, to assess the degree of plastic deformation, the coefficient of transverse shrinkage of the chips was used: = ℎ , (1) where a chip is chip thickness, mm; a material to be removed is the thickness of material to be removed, mm. 2. Experimental details Experimental researches were carried out using a measuring complex. The system includes lathe 1 И 611 (high precision versatile screw-cutting lathe), turning tool with strain-gauges “Sandvik Koromant” PSSNP 202OK12, and carbide tips SNMM 120 408 E – NR2HF 10, and the laptop. Cutting speed and depth of a cut were constant values during the experiment (V=18.84 m/min, t=1.5 mm). A large toolmaker microscope with 0.005 mm accuracy of measurement and a micrometer with 0.01mm accuracy of measurement were used to measure the chip thickness. 3. Results The results of the experimental researches are presented in table 2 (dependence of the coefficient of transverse shrinkage of the chips on the amount of feed).

Table 2. Transverse chip shrinkage factor vs. cutting feed .

a chip

a ξ

S, mm/rev

a material to be removed

1

2

3

Mean

0,01

0,055

0,045

0,045

0,048

0,007

6,835

0,015

0,045

0,025

0,04

0,036

0,010

3,457

0,02

0,035

0,045

0,04

0,04

0,014

2,828

0,04

0,04

0,045

0,06

0,048

0,028

1,708

0,05

0,05

0,065

0,055

0,056

0,035

1,602

0,075

0,07

0,085

0,08

0,078

0,053

1,477

0,125

0,12

0,11

0,115

0,115

0,088

1,301

0,15

0,15

0,135

0,12

0,135

0,106

1,272

0,22

0,19

0,195

0,2

0,195

0,155

1,253

0,3

0,27

0,26

0,27

0,266

0,212

1,257

0,375

0,33

0,345

0,33

0,335

0,265

1,263

Based on the data obtained, a graph was also built, shown in Fig. 2