Ultra-precision face grinding with constant pressure, lapping kinematics, and SiC grinding wheels dressed with overlap factor

Autor(es)

Fiocchi, Arthur Alves ^[1] ; Fortulan, Carlos Alberto ^[2] ; de Angelo Sanchez, Luiz Eduardo ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Dept Mech Engn, BR-17033360 Bauru, SP - Brazil

^[2] Univ Sao Paulo, Dept Mech Engn, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY; v. 79, n. 9-12, p. 1531-1543, AUG 2015.
• Citações Web of Science: 8

Resumo

Several machining processes have been created and improved in order to achieve the best results ever accomplished in hard and difficult to machine materials. Some of these abrasive manufacturing processes emerging on the science frontier can be defined as ultra-precision grinding. For finishing flat surfaces, researchers have been putting together the main advantages of traditional abrasive processes such as face grinding with constant pressure, fixed abrasives for two-body removal mechanism, total contact of the part with the tool, and lapping kinematics as well as some specific operations to keep grinding wheel sharpness and form. In the present work, both U (d)-lap grinding process and its machine tool were studied aiming nanometric finishing on flat metallic surfaces. Such hypothesis was investigated on AISI 420 stainless steel workpieces U (d)-lap ground with different values of overlap factor on dressing (U (d) = 1, 3, and 5) and grit sizes of conventional grinding wheels (silicon carbide (SiC) = \#800, \#600, and \#300) applying a new machine tool especially designed and built for such finishing. The best results, obtained after 10 min of machining, were average surface roughness (Ra) of 1.92 nm, 1.19-mu m flatness deviation of 25.4-mm-diameter workpieces, and mirrored surface finishing. Given the surface quality achieved, the U (d)-lap grinding process can be included among the ultra-precision abrasive processes and, depending on the application, the chaining steps of grinding, lapping, and polishing can be replaced by the proposed abrasive process. (AU)

• Processo FAPESP: 11/22486-7 - Modificações corretivas no desenvolvimento da máquina de lapidoretificação para melhorar o desempenho do processo e permitir o seu emprego no acabamento de peças cerâmicas
• Beneficiário: Luiz Eduardo de Angelo Sanchez
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 02/06452-6 - Desenvolvimento e avaliacao de um processo abrasivo combinando caracteristicas da lapidacao e retificacao.
• Beneficiário: Luiz Eduardo de Angelo Sanchez
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/50233-3 - Avancos no desenvolvimento de um processo para acabamento de pecas planas empregando um disco abrasivo sob variados graus de reconhecimento e cinematica da lapidacao.
• Beneficiário: Luiz Eduardo de Angelo Sanchez
• Modalidade de apoio: Auxílio à Pesquisa - Regular