A novel technique of friction aided deep drawing using a blank-holder divided into four segments

Of this technique compared to the conventional deep drawing is that the circular cup can be carried out in single action press with limit In this paper a new mechanism for deep drawing was proposed to produce circular cup from thin plate without blank holder. In this technique the die assembly includes punch, die and die-punch. A 2D axisymmetric finite element model was built using DEFORM software. Effect of die geometry (half- cone angle) on maximum load, thickness distribution, strain distribution and effect of clearance ratio between punch and (die-punch) on the wrinkling of the cup were investigated. Three half-cone angles of die (15o, 30o and 45o) were used for forming sheet metal of brass (CuZn37) which had initial thickness of (1mm) at four clearance ratio (c/t) for die of 30o half-cone angle. Finite element model results showed good agreement with experimental results. Die of 30o half-cone angle with clearance ratio (c/t) of 0.9 gave the best product without wrinkling. The main advantage drawing ratio (LDR) of 1.86 and blank diameter to blank thickness ratio (d/t) < 86.

Download Full-text

Experimental Study and Analysis of the Influence of Drawbead against Restriction and Deep Drawing Force of Rectangular Cup-Cans with Tin Plate Material

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.315.246 ◽

2013 ◽

Vol 315 ◽

pp. 246-251 ◽

Cited By ~ 2

Author(s):

Susila Candra ◽

I. Made Londen Batan

Keyword(s):

Deep Drawing ◽

Material Flow ◽

Radial Stress ◽

Steel Sheet ◽

Plate Material ◽

Drawing Force ◽

Blank Holder Force ◽

Blank Holder ◽

In The Beginning ◽

Restraining Force

Drawbead are often used to control the flow of material, stress and deep drawing force in the flange area. This paper discussed the drawbead (fully, not fully and without drawbead) that combined with variations in the blank holder force against restriction of material flow and drawbead restriction force of deep drawing with palm oil lubrication. In this paper, analytical and experiments are used to predict the drawbead restraining and deep drawing force. The tin steel sheet with a thickness of 0.2 mm is used as speciment. The results obtained, that the application fully drawbead be very effective in controlling the flow of materials in the flange, as compared to not fully and without drawbead. In the beginning of the process (punch stroke < 4 mm), the magnitude of restraining force and deep drawing force can be increased. And, the magnitude of Radial Stress increases, conversely the magnitude of tangential stress decreased. This can prevent the occurrence optimum blank holder force is recommended in range 4394-8788 N. Comparisons of results between the analysis and experiments show the phenomenon is similar.

Download Full-text

Study of the Parameters of Deep Drawing Process Based on the Simulation of Dynaform

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.51 ◽

2012 ◽

Vol 249-250 ◽

pp. 51-58

Author(s):

Qing Wen Qu ◽

Tian Ke Sun ◽

Shao Qing Wang ◽

Hong Juan Yu ◽

Fang Li

Keyword(s):

Friction Coefficient ◽

Sheet Metal ◽

Deep Drawing ◽

Drawing Process ◽

Blank Holder Force ◽

Blank Holder ◽

Deep Drawing Process ◽

Drawing Die ◽

Drawing Speed

A simulation of deep drawing process on the sheet metal was done by using Dynaform, the influence of blank holder force, deep drawing speed and friction coefficient on the forming speed of sheet metal in the deep drawing process were got. The forming speed of sheet metal determines the quality of deep drawing, in the deep drawing process the blank holder force and the deep drawing speed are controllable parameters, the friction coefficient can be intervened and controlled, and it’s a manifestation of the interaction of all parameters, the main factors which influence the friction coefficient just have blank holder force, deep drawing speed and lubrication except the material. The conclusion of this study provides the basic data for the analysis of the lubrication of mould, the study of lubricant and the prediction of the service life of deep drawing die.

Download Full-text

Research on Deep Drawing with Multi-Point Variable Blank-Holder Force Controlling by Computer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.645 ◽

2012 ◽

Vol 472-475 ◽

pp. 645-648

Author(s):

Ming Ming Ding ◽

Yong Huang ◽

Yu Qing Shi

Keyword(s):

Deep Drawing ◽

Low Cost ◽

Hydraulic Press ◽

Blank Holder Force ◽

Blank Holder ◽

Variable Blank Holder Force ◽

Blank Holding Force ◽

Working Principle ◽

Cylindrical Cup ◽

Set Up

On the basses of analyzing the defects of variable blank holder force hydraulic press on construction and its rigid being not enough,the realization of designing method,working principle,hydraulic and system for ne controlling w type upper multi-point deep drawing with variable blank—holding force controlled by computer was introduced.In order to verify the effect of application of this set up,the testing results of deep drawing a rectangular box and a cylindrical cup formed component was presented. The results show that the equipment has low cost, general in using and optimal efficient of controlling.

Download Full-text

Optimization of variable blank holder force in deep drawing based on support vector regression model and trust region

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-019-04477-5 ◽

2019 ◽

Vol 105 (10) ◽

pp. 4265-4278

Author(s):

Yixiong Feng ◽

Zhaoxi Hong ◽

Yicong Gao ◽

Runjie Lu ◽

Yushan Wang ◽

...

Keyword(s):

Regression Model ◽

Support Vector Regression ◽

Deep Drawing ◽

Trust Region ◽

Support Vector ◽

Blank Holder Force ◽

Support Vector Regression Model ◽

Blank Holder ◽

Variable Blank Holder Force

Download Full-text

Effect of Blank Holder Force with Low Frequency Vibration Technique in Circular-Cup Deep-Drawing Using AZ31 Magnesium Alloy Sheet

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.2785 ◽

2011 ◽

Vol 383-390 ◽

pp. 2785-2789

Author(s):

Naoki Horiike ◽

Shoichiro Yoshihara ◽

Yoshitaka Tsuji ◽

Yusuke Okude

Keyword(s):

Deep Drawing ◽

Low Frequency ◽

Lubricating Oil ◽

Drawing Process ◽

Blank Holder Force ◽

Forming Process ◽

Blank Holder ◽

Deep Drawing Process ◽

Low Frequency Vibration ◽

Friction Performance

In the deep-drawing process, the application of low-frequency vibration to the blank material has recently been focused on with the aim of improving the friction performance between the die and the blank material. A servo-controlled press machine is suitable for applying low-frequency vibration to the blank during the deep-drawing process, because the punch speed and blank holder force (BHF) are easily controlled as process parameters by using the servo motors. In this study, a BHF with low-frequency vibration was proposed as a technique for improving deep-drawability, which is mainly affected by the friction performance and the lubricant condition. We found that the friction performance between the blank surface and the blank holder was decreased in the case of a BHF with low-frequency vibration since the lubricating oil rapidly flowed into the clearance during the forming process. Furthermore, for a BHF with low-frequency vibration, the punch force and the deformation resistance were lower than those in a deep-drawing test without low-frequency vibration.

Download Full-text