Estimation of Frictional Shearing Stress Under Lubricated Contact Conditions in Ring Upsetting. Application of Ultrasonic Examination.

Saiki, Hiroyuki; Sakata, Yutaka; Marumo, Yasuo; Zhan, Hong Zhi

doi:10.1299/kikaic.60.3171

Cited by 10 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ultrasonic waves can be used in sensors for effectively examining the contact state between tools and a material. [5][6][7][8] We carried out the in-process monitoring of wrinkles generated during sheet metal forming using a universal testing machine with dies embedded with a vertical ultrasonic probe. 9) We found that the generation of wrinkles in the specimens was detectable from the change in the maximum amplitude of reflected ultrasonic waves (reflection intensity).…”

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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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.

Self Cite

View full text Add to dashboard Cite

show abstract

“…(14) Furthermore, in the ring compression test of aluminum under lubrication conditions, the contact pressure and the friction shear stress on the tool-workpiece contact interface were obtained through continuous measurement of the ring outer diameter and ultrasonic measurement of the contact interface. (15,16) The AE sensor measures elastic waves propagating in the machine and tool. The detection area of the AE sensor is wide.…”

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…In-process monitoring using sensors enables the inspection of all products or observation of the processing [3,4]. Moreover, ultrasonic waves can be used to observe the state of contact between the tool and the material [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Development of Apparatus for Evaluation of Wrinkles in Sheet Metal Forming Using Angle Beam Technique

Segawa

Nishikubo

Marumo³

et al. 2018

KEM

View full text Add to dashboard Cite

Ultrasonic measurement is used to evaluate wrinkles during sheet metal forming. The authors developed a new apparatus for investigating the relationship between the wrinkles in press forming and the ultrasonic reflection characteristic of an angle beam. The new evaluation apparatus was composed of probe-fixing parts, an upper die, a middle die, and a lower die. A specimen was sandwiched by a pair of dies in the evaluation apparatus. Angle beam probes for transmission and reception were set on the upper die. Specimens in the form of plates having periodic trapezoidal wrinkles were fabricated by electro-discharge machining. In the new evaluation apparatus, the specimen is placed in contact with the die. Wrinkling was found to change the ultrasonic reflection characteristic of an angle beam. The new apparatus can thus be used to evaluate wrinkles using the angle beam technique.

show abstract

Estimation of Frictional Shearing Stress Under Lubricated Contact Conditions in Ring Upsetting. Application of Ultrasonic Examination.

Cited by 10 publications

References 0 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

Development of Apparatus for Evaluation of Wrinkles in Sheet Metal Forming Using Angle Beam Technique

Contact Info

Product

Resources

About