Improving Precision in Aluminum Alloy Machining Due to the Application of Diamond-Like Carbon Thin Film

Autor(es)

Silva, William de Melo ^[1] ; Martins, Paulo Sergio ^[2] ; de Carvalho, Vagner Eustiquio ^[3] ; da Cruz, Nilson Cristino ^[4] ; Claudino, Enzo ^[5] ; Goncalves Carneiro, Jose Rubens ^[6]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ IBTEC UNESP, Mat Sci & Engn Lab, Al Tecomarias S-N, BR-18607440 Botucatu, SP - Brazil

^[2] Fiat Chrysler Grp, Av Contorno 3455, BR-32501970 Betim - Brazil

^[3] Univ Fed Minas Gerais, Dept Phys, Av Presidente Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG - Brazil

^[4] Sao Paulo State Univ, Inst Sci & Technol, Lab Technol Plasmas, Av Tres de Marco 511, BR-18087180 Sorocaba, SP - Brazil

^[5] Sao Paulo State Univ, Mat Sci & Engn Lab, Al Tecomarias S-N, BR-18607440 Botucatu, SP - Brazil

^[6] Pontificia Univ Catolica Minas Gerais, Dept Mech Engn, Av Dom Jose Gaspar 500, BR-30535610 Belo Horizonte, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME; v. 143, n. 7 JUL 1 2021.
• Citações Web of Science: 0

Resumo

Cutting precision is extremely affected by a phenomenon known as built up edge (BUE) that occurs on tungsten carbide tools during low cutting speed of aluminum alloy. BUE is responsible for early tool breakage due to excessive material build up from the machined part on the cutting face, leading to problems of shape irregularity and tool-tip breakage. Thus, diamond-like carbon (DLC) was deposited and tested to verify cutting precision in aluminum alloy by using tungsten carbide tools. The characterizations of the film were morphology analysis through scanning electron microscopy (SEM), structural atomic analyze of chemical bond from Raman backscatter spectroscopy, the distribution of carbon atoms on the film surface by X-ray photoelectron spectroscopy (XPS), and the evaluation of Young's modulus and hardness using the Oliver-Pharr method. To analyze the cutting precision, drilling tests were performed on coated/uncoated drills at two cutting speeds (340 and 430 m/min). As an evaluation parameter in the aluminum alloy, the hole diameter deviation was measured after pre determined numbers of drilling operations. Statistical comparisons between the diameter deviation as a function of the number of drilling test indicated better cutting accuracy for the DLC-coated tool. The factors identified in this work, such as the reduction of the friction coefficient, and the hardness and Young's modulus of the DLC helped in the performance of the tool, mainly in the lower cutting speed. (AU)

• Processo FAPESP: 15/20438-6 - Modificação de superfície de aços inoxidáveis, titânio puro e ligado para a prevenção da formação de biofilme: um estudo comparativo entre a engenharia de superfície e o uso de antibióticos
• Beneficiário: William de Melo Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular