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. 2024 May 29;16(11):1537.
doi: 10.3390/polym16111537.

Influence of Cutting Regime Parameters on Determining the Main Cutting Resistance during Polypropylene Machining

Slavica Prvulović  1 , Predrag Mošorinski  1 , Ljubiša Josimović  2 , Jasna Tolmač  1 , Luka Djordjević  1 , Mića Djurdjev  1 , Mihalj Bakator  1 , Branislava Radišić  1 , Dejan Bajić  1
Affiliations

Influence of Cutting Regime Parameters on Determining the Main Cutting Resistance during Polypropylene Machining

Slavica Prvulović et al. Polymers (Basel). .

Abstract

This study examines the impact of cutting regimes on determining cutting resistance in the processing of polypropylene (PP) using the CNC lathe EMCO F5. The rationale for this research stems from polypropylene's rarity among thermoplastics in possessing structural stability, allowing for its comparison to metals and practical application in products replacing metal parts. Leveraging its favorable mechanical properties, polypropylene finds utility in producing parts subject to dynamic loads, boasting high resistance to impact loads-particularly undesirable in machining. An advantageous characteristic of polypropylene is its affordability, rendering it an economical choice across numerous applications. Despite these merits, polypropylene's exploration in cutting processing remains limited, underscoring the novelty of this research endeavor. The main method for determining cutting resistance involves measuring electric current strength during processing. This direct measurement, facilitated by input cutting regime parameters, is recorded by the PLC controller, with the current value extracted from the machine tool's ammeter. The experimental approach entails varying cutting regime parameters-cutting speed (v), feed rate (s), and depth of cut (a)-across minimum and maximum values, recognized as pivotal factors influencing cutting force development and the attainment of the desired machined surface quality.

Keywords: CNC lathe; PLC; cutting resistance; machining; manufacturing efficiency; polypropylene.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Cutting force (FR) in orthogonal cutting. Where: FR—cutting force; F1—main cutting force resistance; F2—penetration resistance.
Figure 2
Figure 2
Computerized measurement system for detecting cutting force. Picture 1 and 7—photographs of the computer and the universal lathe equipped with a turner, Picture 2 and 3—the programmable logic controller, Picture 4—the measuring clamps, Picture 5—the tool holder with the turning tool, Picture 6—auxiliary temperature gauge.
Figure 3
Figure 3
Computer power supply and data transmission system.
Figure 4
Figure 4
Workpiece.
Figure 5
Figure 5
Values of calculated cutting regime parameters vf, n, ω.
Figure 6
Figure 6
Values of calculated cutting regime parameters ap, s.
Figure 7
Figure 7
Electric current measurement results, I (A).
Figure 8
Figure 8
Statistics of the measured current values (I).
Figure 9
Figure 9
Statistics of the correction factor results.
Figure 10
Figure 10
Current diagram for measurement number 1.
Figure 11
Figure 11
Electric current diagram for ap = 1.5 mm.
Figure 12
Figure 12
Electric current diagram for ap = 2 mm.
Figure 13
Figure 13
Values of the main cutting resistance for individual experimental measurements.
Figure 14
Figure 14
Maximum, minimum, and mean values for the main cutting resistance.
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