A new scanning technique for X-ray computed tomography

Nukaga, Jun; Kitazawa, Shoichi; Kamimura, Hiroshi

doi:10.1016/j.ndteint.2008.04.003

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Hence, 3D solid works software was used for generating 3D model of the images. The large tolerance level (0.1 mm), typical in foundry processes [19] was considered for the present study. Post processing image is converted to the solid model part (SLD-part) file format.…”

Section: Resultsmentioning

confidence: 99%

Shrinkage Estimation of Cast Al–Si Alloys through Process Simulation

Santhi¹,

Sundarrajan²

2017

Metallofiz. Noveishie Tekhnol.

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With the advent of various casting process simulation techniques, it is possible to derive theoretically casting parameters, which can be further validated through experiments. In this paper, detailed simulation activities are carried out to determine the shrinkage characteristics of two Al-Si alloys (US 413 and US A356) followed by validation through experimental studies. Production of defect-free castings requires good understanding of shrinkage characteristics. The influence of various process parameters on these characteristics determines the casting quality. Based on this, an extensive study is undertaken to comprehend the influence of various parameters.Keywords: shrinkage, cast aluminium alloys, casting mould, process simulation, solid model, design of experiments.З появою різних метод моделювання процесу лиття з'явилася можливість теоретично оцінити параметри лиття, які можуть бути додатково переві-рені за допомогою експериментів. В даній роботі було проведено детальне моделювання для визначення характеристик усадки двох стопів Al-Si (US 413 і US A356) з подальшою перевіркою за допомогою експерименту. Виробництво виливків без дефектів потребує доброго розуміння характе-ристик усадки. Вплив різних параметрів процесу на ці характеристики визначає якість виливки. Виходячи з цього, було проведено цілу низку досліджень, щоб визначити вплив різних параметрів. С появлением различнûх методов моделирования процесса литья появи-лась возможность теоретически оценить параметрû литья, которûе могут бûть дополнительно проверенû с помощью экспериментов. В данной ра-боте бûло проведено детальное моделирование для определения характе-ристик усадки двух сплавов Al-Si (US 413 и US A356) с последующей про-веркой с помощью эксперимента. Производство отливок без дефектов тре-бует хорошего понимания характеристик усадки. Влияние различнûх параметров процесса на эти характеристики определяет качество отлив-ки. Èсходя из этого, бûло проведено обширное исследование, чтобû опре-делить влияние различнûх параметров.Ключевые слова: усадка сплава, литûе алюминиевûе сплавû, литейная форма, моделирование процессов, модель твёрдого тела, проектирование экспериментов.

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Section: Resultsmentioning

confidence: 99%

Shrinkage Estimation of Cast Al–Si Alloys through Process Simulation

Santhi¹,

Sundarrajan²

2017

Metallofiz. Noveishie Tekhnol.

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“…The results reported a spatial resolution of 0.8 mm in the reconstructed image using iron test pieces with different diameters. The further developments of Hitachi focused on a direct converting detector system based on a so-called 'edge on' illumination of a Si or CdTe [154] die, converting the incident x-rays directly into an electrical signal. The geometry of the die lead to several centimetres of absorption path and thus results in a high efficiency of the sensor.…”

Section: Linear Accelerators (Electrodynamic)mentioning

confidence: 99%

Review of high energy x-ray computed tomography for non-destructive dimensional metrology of large metallic advanced manufactured components

et al. 2022

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Advanced manufacturing technologies, led by additive manufacturing, have undergone significant growth in recent years. These technologies enable engineers to design parts with reduced weight while maintaining structural and functional integrity. In particular, metal additive manufacturing parts are increasingly used in application areas such as aerospace, where a failure of a mission-critical part can have dire safety consequences. Therefore, the quality of these components is extremely important. A critical aspect of quality control is dimensional evaluation, where measurements provide quantitative results that are traceable to the standard unit of length, the metre. Dimensional measurements allow designers, manufacturers and users to check product conformity against engineering drawings and enable the same quality standard to be used across the supply chain nationally and internationally. However, there is a lack of development of measurement techniques that provide non-destructive dimensional measurements beyond common non-destructive evaluation focused on defect detection. X-ray computed tomography (XCT) technology has great potential to be used as a non-destructive dimensional evaluation technology. However, technology development is behind the demand and growth for advanced manufactured parts. Both the size and the value of advanced manufactured parts have grown significantly in recent years, leading to new requirements of dimensional measurement technologies. This paper is a cross-disciplinary review of state-of-the-art non-destructive dimensional measuring techniques relevant to advanced manufacturing of metallic parts at larger length scales, especially the use of high energy XCT with source energy of greater than 400 kV to address the need in measuring large advanced manufactured parts. Technologies considered as potential high energy x-ray generators include both conventional x-ray tubes, linear accelerators, and alternative technologies such as inverse Compton scattering sources, synchrotron sources and laser-driven plasma sources. Their technology advances and challenges are elaborated on. The paper also outlines the development of XCT for dimensional metrology and future needs.

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“…With the advanced development of large-area, digital detectors and high-energy X-ray generators, CBCT has been increasingly used for industrial, nondestructive testing applications such as visualization of inner and outer structures of electronic components, packaging, and interconnection technologies or crack-detection of automobile parts [1, 2, 3]. The CBCT has advantages of substantially shorter acquisition time and isotropic spatial resolution of the reconstructed images over the fan-beam CT which has been the dominant scanning modality in the industrial CT.…”

Section: Introductionmentioning

confidence: 99%

Image reconstruction in reduced circular sinusoidal cone-beam CT

Xia

Cho

Pan

2009

Journal of X-Ray Science and Technology

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Cone-beam computed tomography (CBCT) plays an important role in industrial, nondestructive testing applications not to mention in medical applications. Circular scanning configuration is widely used for its mechanical simplicity and for readily available and efficient reconstruction algorithms based on the Feldkamp algorithm. However, due to the lack of data sufficiency, circular CBCT does not guarantee image accuracy, and is not free from image artifacts related to the cone-angle and axial variation of the object anatomy. Therefore, non-circular scanning geometries such as helix or circular sinusoid, which provide sufficient data for exact image reconstruction within the scanned volume, are favorable when accurate images free of cone-angle artifacts are desired. Analytic algorithms have been developed for image reconstruction from cone-beam data acquired with a full-scan (or, equivalently, a closed) circular sinusoidal trajectory. In many applications such as industrial inspection of a product where a high throughput is important, it is desirable to have a short scan time. In this work, we propose an innovative imaging approach in which a reduced-scan (or, equivalently, an open) circular sinusoidal trajectory is used for acquiring data sufficient for exact 3D image reconstruction. A filtered backprojection (FBP) algorithm based on Pack-Noo's reconstruction formula is applied for image reconstruction in reduced-scan circular sinusoidal scans. We have conducted numerical studies to demonstrate the reduced-scan approach and to validate the FBP reconstruction algorithm in the proposed approach. The proposed scanning method can contribute to increasing the throughput of a scanner, while improving the image quality compared to a conventional circular scan.

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A new scanning technique for X-ray computed tomography

Cited by 3 publications

References 4 publications

Shrinkage Estimation of Cast Al–Si Alloys through Process Simulation

Shrinkage Estimation of Cast Al–Si Alloys through Process Simulation

Review of high energy x-ray computed tomography for non-destructive dimensional metrology of large metallic advanced manufactured components

Image reconstruction in reduced circular sinusoidal cone-beam CT

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