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

2018 ◽  
Vol 792 ◽  
pp. 185-189
Author(s):  
Yuji Segawa ◽  
Daichi Nishikubo ◽  
Yasuo Marumo ◽  
Tomohiro Nonaka ◽  
Yutaka Sakata
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Ultrasonic Measurement ◽  
Reflection Characteristic ◽  
Electro Discharge Machining ◽  
Press Forming ◽  
New Apparatus ◽  
The Relationship ◽  
Beam Technique

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.

A Study on Dieless Incremental Sheet Metal Forming Using Water Jet Technology

2011 ◽  
Vol 189-193 ◽  
pp. 795-800 ◽  
Author(s):  
He Kai ◽  
Jiu Hua Li ◽  
Qun Luo ◽  
He Mao ◽  
Ru Xu Du
Keyword(s):  
Simulation Model ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Fluid Structure Interaction ◽  
Water Jet ◽  
Structure Interaction ◽  
Incremental Sheet Metal Forming ◽  
Interaction Simulation ◽  
The Relationship

A new method of sheet metal forming, water jet incremental sheet metal forming (WJISMF) is presented. We give the schematic illustration of WJISMF system, which includes high pressure system, NC machine, control system, water recycle system, and some attachments, and then the virtual prototype of the system is designed. To predict the whole deformation process, some simulations are carried out. Firstly, fluid structure interaction simulation for WJISMF is performed. The water jet is modeled and simulated with a computational fluid dynamics (CFD) approach, while for the material flow in the workpiece a finite element analysis (FEA) is used. Secondly, the relationship between the workpiece material deformation and nozzle diameter, and the relationship between deformation and water pressure are presented. Thirdly, the fluid structure interaction simulation model is simplified to the structure simulation model, by adopting shell 181 element and using a pressure acting on the workpiece directly instead of the CFD model. Finally, a simulation for forming a cone box is done using the simplified model. The simulation provides a powerful rationale for the practical application of WJISMF.

Sheet Metal Forming Research in Japan

1966 ◽  
Vol 88 (1) ◽  
pp. 101-110 ◽  
Author(s):  
S. Fukui ◽  
K. Yoshida ◽  
S. Kobayashi
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
High Strain ◽  
High Energy ◽  
Stress And Strain ◽  
Strain Rates ◽  
High Strain Rates ◽  
Press Forming ◽  
Flange Forming

Research activities and their results on sheet metal forming in Japan are introduced with emphasis on the mechanics of sheet metal press-forming. Based on the governing deformation mechanisms and the characteristics of forming limits, sheet metal press-forming processes are classified into deep drawing, bulging, stretch flange forming, and bending. According to this classification, formability and its testing can systematically be evaluated with the aid of the analysis of process mechanics. For the stress and strain analyses, the method of calculation is well established and the use of a computer reveals the detail stress and strain distributions in the process. A basic problem in high energy rate processes is the mechanical behavior of materials at high strain rates, and the deformation of sheet metals in high-speed tension test is discussed. There are many problems still left for the future. A few of these are the conditions of instability and fracture, the effect of anisotropy, the analysis considering the stress and strain variations in the thickness direction, formabilities, the properties of materials at high strain rates, tool wear, and tool deformations.

ИССЛЕДОВАНИЕ ТОЧНОСТИ ДЕТАЛЕЙ, ПОЛУЧАЕМЫХ ПРИ РАЗДЕЛИТЕЛЬНЫХ ОПЕРАЦИЯХ В ПЕРЕНАЛАЖИВАЕМЫХ ШТАМПАХ

2018 ◽  
pp. 52-63
Author(s):  
Е. А. Фролов ◽  
В. В. Агарков ◽  
С. И. Кравченко ◽  
С. Г. Ясько
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Balance Method ◽  
Experiment Planning ◽  
Practical Recommendations

To determine the accuracy of the readjustable punches for separating operations (perforation + punching out) of sheet-metal forming, the accuracy parameters were analyzed using the random balance method using the method of experiment planning. Analytical dependencies are obtained to determine the values of deviation of the outer and inner contour dimensions of perforated and punched out sheet parts. From the dependencies obtained, it is possible to estimate and predict the value of deviation in the dimensions of the resulting part at any time during the operation of the punch. Practical recommendations on the calculation of the actuating dimensions of the working elements (stamping punch, matrix) of readjustable punches are offered.

Development of New Apparatus to Evaluate Ultrasonic Reflection Characteristic for Wrinkling in Press Forming

2017 ◽  
Vol 10 (02) ◽  
pp. 170-174 ◽  
Author(s):  
YUJI SEGAWA ◽  
TAKUYA KURIYAMA ◽  
YASUO MARUMO ◽  
TAEKYUNG LEE ◽  
YASUHIRO IMAMURA ◽  
...  
Keyword(s):  
Reflection Characteristic ◽  
Press Forming ◽  
New Apparatus
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