Development of an innovative monitoring system for spray fields in hot forging processes

Behrens, Bernd‐Arno; Frischkorn, Conrad; Lüken, I.

doi:10.1007/s11740-012-0396-4

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…However, the delay in the detection of defects and their countermeasures may lead to increased cost and loss. To overcome this problem, quality control technologies [1][2][3][4] using the data obtained by sensors and cameras installed in processing equipment have been developed. Digitization using the Internet of Things (IoT) technology is under way at manufacturing sites.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Reflection Characteristics of Defects in Sheet Metal Forming —Effects of Wrinkles and Contaminant—

Segawa,

Kuriyama,

Takeda

et al. 2024

Mater. Trans.

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Ultrasonic waves are effective in examining the contact state between the die and the material during sheet metal forming. In this study, ultrasonic measurements were performed on wrinkles and contaminant in press forming. A model specimen simulating wrinkles was used in the measurement of wrinkles. The contaminant was placed on a flat specimen and sandwiched between dies in the ultrasonic measurement of contaminant. The reflection intensity of 2.25 MHz ultrasonic waves irradiated to the convex part of the wrinkle decreased as the number of wrinkles with a wrinkle wavelength of 4 mm increased. However, the ultrasonic reflection intensity at the convex part of the wrinkles was not related to the number of wrinkles in 5 MHz ultrasonic waves. The contaminant changed the reflection characteristics of ultrasonic waves. The frequency characteristics of the reflected wave changed markedly at a specific frequency because of wrinkling and contamination. 2.25 MHz and 5 MHz ultrasonic waves were able to detect contaminants of the size occurring at the production site and wrinkles with a wrinkle height of 0.01 mm not only from the ultrasonic reflection intensity but also from the frequency characteristics.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Reflection Characteristics of Defects in Sheet Metal Forming —Effects of Wrinkles and Contaminant—

Segawa,

Kuriyama,

Takeda

et al. 2024

Mater. Trans.

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“…The high quality and process stability of forging was maintained by monitoring the circuit voltage fluctuation. (3) A load sensor and transmission-type fiber-laser sensors detected the scrapjumping in pierce processing. (4) Several methods were also developed for deep drawing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Wrinkles in Sheet Metal Forming on Ultrasonic Reflection Characteristics of Angled Beam

Segawa¹,

Watanabe²,

Marumo³

et al. 2019

Sensors and Materials

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In this paper, the relationships between wrinkles in sheet press forming and the ultrasonic reflection characteristics of an angled beam are shown. An angled probe was used assuming a case in which a vertical probe cannot be placed directly above defects. The wrinkles were evaluated using an apparatus that reproduced the die-workpiece contact situation of press forming. Model specimens used in the experiments had trapezoidal wrinkles similar to the wrinkle shape in press forming. The workpiece was sandwiched by dies in the apparatus. The apparatus was connected to an ultrasonic flaw detector. The relationship between the wrinkle shape and the irradiation position of ultrasonic waves was accurately obtained using the apparatus. Wrinkling was detected from the change in reflection intensity, i.e., the maximum amplitude of reflected waves. The reflection intensity varied with the wrinkle shape for a single wrinkle or periodic wrinkle with a wrinkle wavelength of 8 mm or more. This tendency was also observed for a vertical probe. The wrinkle evaluation using the angled probe was as effective as that using a vertical probe.

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“…Alternatively, researchers and engineers have endeavored to develop in-process inspection technology to rapidly detect the defects and resultantly minimize the loss. For example, they focused on sensors for monitoring the formation of defects during the forming process [1][2][3][4] and manufacturing condition [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Periodic Wrinkle during Sheet Press Forming Utilizing Frequency Characteristic of Ultrasonic Wave

Segawa

Kuriyama²,

Harada³

et al. 2018

DDF

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This study suggests a novel method to detect wrinkles using the frequency characteristic of reflected ultrasonic wave. The experimental apparatus was manufactured to simulate the press forming. A plate specimen possessing periodic wrinkles in a trapezoidal shape was also prepared to simulate actual wrinkles during the press forming process. These wrinkles affected the reflected wave of ultrasonic wave. The power spectrum of reflected wave at a frequency of 0.8 MHz was changed by the occurrence of wrinkles. The comparison of the frequency characteristics provided obvious difference between wrinkled and flat specimens. As a result, the present work confirmed that the frequency characteristic of reflected wave would detect the formation of wrinkles.

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Development of an innovative monitoring system for spray fields in hot forging processes

Cited by 4 publications

References 4 publications

Ultrasonic Reflection Characteristics of Defects in Sheet Metal Forming —Effects of Wrinkles and Contaminant—

Ultrasonic Reflection Characteristics of Defects in Sheet Metal Forming —Effects of Wrinkles and Contaminant—

Influence of Wrinkles in Sheet Metal Forming on Ultrasonic Reflection Characteristics of Angled Beam

Evaluation of Periodic Wrinkle during Sheet Press Forming Utilizing Frequency Characteristic of Ultrasonic Wave

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