The basis for a design support system to prevent defects in forging

Arentoft, Mogens; Wanheim, Tarras

doi:10.1016/s0924-0136(97)00023-x

Cited by 29 publications

(15 citation statements)

References 1 publication

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“…The process adopted involved direct forging to realise a dome avoiding preforging. A defect-free dome realised through P3 was in agreement with Arentoft and Wanheim [11] that lower ℎ/ ratio was improper selection for the present method. The ℎ/ ratio for disc and preform were 0.2 and 0.08, respectively.…”

Section: Resultssupporting

confidence: 81%

“…Such forgings will not be rejected because of free surface cracks, but often machining is required to achieve good surface finish. Hence, defect-matrix developed by Arentoft and Wanheim [11] for forging was employed to understand the reason for formation of defects and ways to eliminate them. Table 2 gives defect-matrix for the present process with possible reasons for free surface cracks, with defects in the column and causes in the row.…”

Section: Resultsmentioning

confidence: 99%

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Closed Die Hammer Forging of Inconel 718

Krishna

Singh

Murty

et al. 2014

Journal of Metallurgy

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A method for the production of Inconel 718 (IN-718) hemispherical domes by closed die hammer forging is proposed. Different combination of operations employed for production are as follows: (i) preforging + final forging + air cooling, (ii) preforging + final forging + controlled cooling, (iii) direct forging + controlled cooling, and (iv) direct forging + air cooling. Last three combinations yielded a crack free hemispherical dome. The forged hemispherical domes were solution annealed at 980°C for 1 h and air cooled. The grain size of the domes at all locations was finer than ASTM No 4. Mechanical properties of the forged dome in solution treated and aged condition (STA) were better than feedstock used.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Closed Die Hammer Forging of Inconel 718

Krishna

Singh

Murty

et al. 2014

Journal of Metallurgy

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“…the die condition, lubrication, perform operation, workpiece properties, temperature and process setting parameters such as shut height etc. (Arentoft and Wanheim 1997). The tonnage is a very important process variable that can reflect the forging press condition, such as the lubrication, wear conditions, etc.…”

Section: Forging Process Monitoring Using Real Datamentioning

confidence: 99%

Discriminant locality preserving projection chart for statistical monitoring of manufacturing processes

He¹,

Zhou²

2014

International Journal of Production Research

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In this paper, we propose a novel multivariate projection chart called the discriminant locality preserving projection chart. The basic idea of the chart is to seek an optimal linear projection of the original data including both the in-control reference data and the newly observed data for monitoring. The projection strives to not only preserve the locality structure of the original data but also maximise the separation between the in-control reference data and the newly observed data. With this projection, the low-dimensional projected data will then be monitored through a T 2 type of statistics. Comparing with the existing projection-based control chart, the proposed chart preserves the local data structure and adaptively identifies the best projection direction to detect the out-of-control data, and thus has more discriminating power, particularly for non-linearly related multidimensional data. The design issues of this chart are discussed in details in this paper. The effectiveness of the proposed method is verified by numerical studies and a real case study of forging process monitoring.

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“…Hence, the cold forging process has a high tendency to form defects. Arentoft and Wanheim [3] classified forging part defect into six: fold, shear defect, surface defect, form defect, crack, and structural defect. Causes of defects include die deflection, yielding or wear, and eccentricity or buckling due to flow imperfection.…”

Section: Introductionmentioning

confidence: 99%

Profile Measurement Based on Focus Variation Method for Geometrical Defect Evaluation: A Case Study of Cold Forged Propeller Blade

Abdullah

Sapuan

Samad

2014

Advances in Mechanical Engineering

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Geometrical defect is one of the main problems that will affect performance and perfect mating of produced parts. Coordinate measurement machine (CMM) is commonly used for the measurement, but the use of this machine is limited because of the small size and complexity of the component or features. This study aims to evaluate the defect that occurs on an AA6061 cold forging blade produced using cold forging process based on profile measurement technique. A systematic approach based on focus variation was proposed to evaluate two features, that is, roundness error and twist deviation. The profile was obtained with the use of InfiniteFocus Alicona 3D surface measurement system. Specific algorithms were developed for different cases as the evaluation of the features is discrete and the results were validated.

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The basis for a design support system to prevent defects in forging

Cited by 29 publications

References 1 publication

Closed Die Hammer Forging of Inconel 718

Closed Die Hammer Forging of Inconel 718

Discriminant locality preserving projection chart for statistical monitoring of manufacturing processes

Profile Measurement Based on Focus Variation Method for Geometrical Defect Evaluation: A Case Study of Cold Forged Propeller Blade

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