Evaluation of the belt punching process efficiency based on the resistance force of the compressed material
- PDF / 5,005,549 Bytes
- 11 Pages / 595.224 x 790.955 pts Page_size
- 85 Downloads / 187 Views
ORIGINAL ARTICLE
Evaluation of the belt punching process efficiency based on the resistance force of the compressed material ´ 1 Dominik Wojtkowiak1 · Krzysztof Tala´ska1 · Dominik Wilczynski Received: 7 June 2020 / Accepted: 21 July 2020 / Published online: 15 August 2020 © The Author(s) 2020
Abstract Vacuum conveyor belt punching process by using the piercing punch which cooperates with the die has potential to be modified in aspects of lowering the perforation force, extending the tool life, and improving the hole quality in the perforated belts. All these parameters have an influence on the efficiency of the process and strictly depends on the punch geometry. This indicates that based on these criteria the optimization of the tool constructional features may be performed. In the presented research, authors have shown the linear correlation between the resistance force of the compressed material of the multilayer polymer composite belt in punching and the efficiency of the process. It was also proved that using the effective geometry of the piercing punch with spherical bowl can reduce the perforation force by 69%. Based on the obtained model, the simplified optimization as well as the evaluation of the punches with defined geometry can be performed, since all characteristics of the material compressive force obtained for the effective punches were almost consistent. For proper analysis, it is necessary to use the combination of the analytical and numerical modelling, computer simulations with using the finite element method (FEM) and the experimental tests. However, by performing simple compression tests for various tool geometry on the strength testing machine, it is possible to perform the comparison analysis of different piercing punches based on the derived models. This approach can be used to evaluate the properties of selected tools for the groups of materials with wide divergence of the mechanical properties without performing the complex research. Keywords Belt perforation · Piercing punch · Tool sharpness · FEM optimization · Manufacturing quality control · Spherical bowl punch
1 Introduction Sheet metal punching is widely discussed in the scientific literature and seems to be a rather simple manufacturing process compared with different mechanical working operations or the machining operations. For example, Soares et al. [1] studied the influence of the punch-die clearance on the sheared edge quality and force necessary to pierce the metal sheet and stated that the clearance between 2 and 5% causes smaller peak of maximum punch force and lower fracture angle. Mucha and Tutak [2] analyzed the correlation between the clearance and tool wear and proved
Dominik Wojtkowiak
[email protected] 1
Faculty of Mechanical Engineering, Institute of Machine Design, Poznan University of Technology, Piotrowo 3 street, 61-138, Pozna´n, Poland
that decreasing clearance (up to 5%) results in lower initial burr values. Vinod and Shivashankar [3] have presented the recent technological advances in sheet
Data Loading...
