Improvement of machining accuracy for 3D surface machining with CNC lathe

Takasugi, Keigo; Morimoto, Yoshitaka; Kaneko, Yoshiyuki; Suzuki, Naohiko; Asakawa, Naoki

doi:10.1299/jamdsm.2018jamdsm0089

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…In these cases, a significant contribution to the machining error can be made by turns of the workpiece, especially in the directions of the prevailing overall dimensions. The need to take into account angular displacements of workpiece under the action of cutting forces was indicated in [3,[29][30][31][32][33][34][35][36][37][38][39][40][41][42]. They even proposed the simplest analytical relationships for calculating these angular displacements.…”

Section: Full-factor Model -Distortion Of Executed Dimensions In Multmentioning

confidence: 99%

Models for Machining Accuracy in Multi-Tool Adjustment

Yusubov

Abbasova

2020

IJAME

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The article discusses the technology capabilities of multi-purpose CNC machines, and possible options for implementing parallel multi-tool processing. It was revealed that the technological capabilities of these machines are used at best by 50% in factories. This is due to the lack of recommendations for the design and use of such adjustments for these machines. To this end, generalised lattice matrix models of the accuracy of multi-tool machining have been developed in order to fulfill the requirements of algorithmic uniformity models and their structural transparency. The use of lattice matrices greatly simplifies the error in model of multi-tool machining and makes it extremely visual. Also, full-factorial distortion models and scattering fields of the dimensions of multi-tool machining performed on modern multi-purpose CNC lathe machines have been developed to take into account the angular displacements of the workpiece when machining parts with prevailing overall dimensions. They take into account the flexibility of the technological system for all six degrees of freedom to identify the influence degree of complex of technological factors on the machining accuracy (structure of multi-tool adjustment, deformation properties of subsystems of a technological system, cutting conditions). A methodology has been developed for determining the complex characteristics of compliance of a technological system. On the basis of the developed accuracy models in spatial adjustments, it is possible to develop recommendations for the design of adjustments for modern multi-purpose machines in CNC turning group (creation of CAD of multi-tool machining). Thus, it is possible to achieve a number of ways to control multi-tool machining, including improving the structure of multi-tool adjustment, calculating the limiting cutting conditions.

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Section: Full-factor Model -Distortion Of Executed Dimensions In Multmentioning

confidence: 99%

Models for Machining Accuracy in Multi-Tool Adjustment

Yusubov

Abbasova

2020

IJAME

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Burnishing of a non-axisymmetric curved surface with a CNC lathe

Takasugi

Shinya

Isozaki

et al. 2021

JAMDSM

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The present study proposes a novel burnishing process called non-axisymmetric curved surface (NACS)-burnishing using a lathe that can machine a non-axisymmetric curved surface, such as a cam for internal combustion engines, with high efficiency. In the present paper, the offset in the Y-direction, which is a unique machining condition for NACS-burnishing, is first described. In this machining method, since the contact point of the burnishing tool changes continuously, the apparent rake angle of the burnishing tool also changes continuously, and its sign affects the finished surface properties. Therefore, it will be shown that the rake angle can be negative in the entire machining region by setting an offset of the tool in the Y-direction based on the geometrical relationship between the tool and the workpiece, and the conditional equation of the rake angle is derived. Next, actual NACS-burnishing experiments are carried out, and the effectiveness of the method is verified in terms of surface roughness and residual stress with the availability of the offset in the Y-direction. In particular, although tearing occurs when there is no offset, it is confirmed that the torn surface can be eliminated by the offset. Thereby, a surface roughness Ra of less than 0.2 m and a compressive residual stress of over 200 MPa can be obtained for hardened steel with HRC60, which has sufficient surface properties.

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Improvement of machining accuracy for 3D surface machining with CNC lathe

Cited by 2 publications

References 13 publications

Models for Machining Accuracy in Multi-Tool Adjustment

Models for Machining Accuracy in Multi-Tool Adjustment

Burnishing of a non-axisymmetric curved surface with a CNC lathe

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