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The Hydro-Multipoint Forming Process of Complex Sheet Metal Parts

Paunoiu V., Teodor V., Baraoiu N.

Journal of Machine Engineering

2015

Vol. 15, No. 3

106--116

The paper presents the concept of a new tool for the sheet metal blanks deformation which is based on the hydro-multipoint method. In this method the upper die with pins is replaced with a hydraulic pressure chamber. The blank sheet is placed between two flexible interpolators and it is deformed under the action of the pressure applied from the hydraulic chamber until it takes the shape of the multipoint die located at the bottom of the equipment. A critical review of the main hydroforming and multipoint forming methods is done. Then, a simulation model for the new hydro-multipoint forming tool is developed. Material thickness, stresses and part dimensions are analysed. A mechanical hydro-multipoint forming tool which was designed and manufactured based on the new concept is presented. Using this tool a number of experiments are done. The real parts are evaluated in terms of surface quality and parts dimensions. The experimental results come to validate the numerical ones. Finally, it was concluded that this new die concept could be used in manufacturing complex sheet metal parts.

Design of stamping and sheet hydroforming test unit

Dilmec M., Turkoz M., Selcuk Halkaci H.

Archives of Materials Science

2007

Vol. 28, nr 1-4

25-29

In order to determine the formability of sheets and obtain the optimum process parameters for the processes, various experiments have to be performed. Some of these experiments are Limiting Dome Height (LDH) and Marciniak tests which are traditional biaxial tests and sheet hydroforming tests. For the purpose of determining process limitations and estimation of stamping characteristics in sheet metal forming, the forming limit diagram (FLD) is used. In this study, a test unit has designed for simulating the processes. In this test unit, traditional biaxial tests and hydroforming tests can be conducted. Detailed system shame for the unit is given. The punch has 35 ton punch force, 300 mm punch stroke and 5-250 mm/min punch velocity. The blank holder has 40 ton force. The hydraulic system's properties are; the fluid medium capable to have 10-700 bar, the pressurized fluid has 10 lt/min volume of flow. The electronic system is composed of a computer and an electronic circuit which are used for adjusting the blank holder force, pressure of fluid medium and punch velocity as using convenient hydraulic elements.