Journal•ISSN: 1755-2060
International Journal of Precision Technology
Inderscience Enterprises Ltd.
About: International Journal of Precision Technology is an academic journal. The journal publishes majorly in the area(s): Surface roughness & Machining. It has an ISSN identifier of 1755-2060. Over the lifetime, 155 publications have been published receiving 748 citations.
Topics: Surface roughness, Machining, Surface finish, Abrasive, Polishing
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TL;DR: These studies extensively are reviewed and the issues and challenges for machine tool accuracy enhancement leading to zero defects parts are identified.
Abstract: The accuracy of machine tools is a critical factor that affects the quality of manufactured products which is one of the most important considerations for any manufacturer. The consistent performance of the machine tool is constrained by the errors built in the machine (e.g., assembly error) or occurring on a periodic basis on the account of change in temperature and cutting forces. A number of studies have been conducted to identify, predict and compensate these errors to improve machine tools accuracy. This paper reviews these studies extensively and identifies the issues and challenges for machine tool accuracy enhancement leading to zero defects parts.
44 citations
TL;DR: In this paper, the cutting force, surface roughness on machined holes and rods and tool wear are compared, and four tools with different specifications (diamond grit size, diamond concentration and metal bond type) are used to drill holes in titanium alloy workpieces.
Abstract: Unique properties of titanium alloys (such as high strength-to-weight ratio, heat and corrosion resistance, shock resistance and erosion resistance) make them important materials in industries. However, poor machinability poses considerable problems in fabrication of components from titanium alloys. Therefore, to machine titanium alloys cost effectively still remains a challenge. In this paper, Rotary Ultrasonic Machining (RUM) of titanium alloy (Ti-6Al-4V) has been investigated. Four tools with different specifications (diamond grit size, diamond concentration and metal bond type) are used to drill holes in titanium alloy workpieces. The cutting force, surface roughness on machined holes and rods and tool wear are compared.
37 citations
Abstract: The development of robust tracking controllers for linear feed drive, high speed machine tools is the primary objective of this work. Robustness implies the controller ability to preserve tracking accuracy in the presence of cutting forces and friction forces. This paper discusses the design and tracking performances of traditional cascade and sliding mode controllers for a xy feed table. Tracking performances are analysed through circular tests that are performed at selected tracking speeds and circle radius. For cascade P/PI controller, tracking error is proportional to the reference speed and is inversely proportional to the velocity gain value of the position loop controller. Speed and acceleration feed forward further reduce this tracking error. Quadrant glitches, a product of non-linear friction phenomena at the point of velocity reversal, are observed. Sliding mode controller, however, significantly reduces quadrant glitches and exhibits greater dynamic stiffness while its tracking accuracy is comparable to the cascade controller.
30 citations
TL;DR: In this paper, the performance of a wiper coated carbide insert in hard turning with respect to tool life and surface finish was investigated. But, despite the potential added values, the use and study on wiper inserts are still lacking in quantity.
Abstract: In recent years, tool manufacturers provide wiper geometry on cutting tools for turning applications with the purpose of increasing productivity and improving surface finish. Despite the potential added values, the use and study on wiper inserts are still lacking in quantity. This current study focuses on the performance of wiper coated carbide insert in hard turning with respect to tool life and surface finish. AISI 420 stainless steel hardened to 47?48 HRC was hard turned at various speeds and feeds ranging in finish turning parameters. Results showed that the maximum tool life of 18 min was achieved and the tool life decreased at higher cutting speeds and feeds. Wear occurred at both the rake and flank faces with crater formation exposing the carbide substrate indicating more severe wear on the rake face. The wiper coated carbide tool resulted in very fine surface finish, much better than the theoretical values.
29 citations
TL;DR: In this paper, the mechanical and tribological properties of neat polyester and its composites were evaluated using Pin-on-Ring (POR) machine and the tests were conducted against different grads of SiC abrasive paper (400, 1000 and 1500G) and applied loads at constant rotational speed of 50rpm for 3 min duration.
Abstract: In the current study, mechanical and tribological characteristics of neat polyester and its composites were evaluated. Polyester composites were based on either synthetic or natural fibres, i.e. chopped strand mat glass fibres reinforced polyester (CGRP) and oil palm fibres reinforced polyester (OPRP) composites. Abrasive wear behaviour of the selected materials was evaluated using Pin-on-Ring (POR) machine. The tests were conducted against different grads of SiC abrasive paper (400, 1000 and 1500G) and applied loads (5-20N) at constant rotational speed of 50rpm for 3 min duration. Scanning electron microscopy (SEM) was used to observe the fracture behaviour of tensile specimens and microstructure of abraded worn surfaces. As a result, oil palm fibres introduced better wear characteristics to polyester in compare to glass fibre. Meanwhile, it showed lower mechanical property than Chopped strand mat Glass fibre Reinforced Polyester (CGRP). For all composites, increasing the SiC paper grades decreases the weight loss while increasing applied loads increases the weight loss.
29 citations