Spinning-punch new technology for aluminum alloy plate-wheels forming
The aluminium alloy plate-wheels are a new kind of wheels with light-weight, energy-saving and environmental protection. Spinning is a conventional technology to form aluminium alloy plate-wheels, but the outline dimension and run-out of rolled lip in end face are difficult to meet the exacting requirements of wheels blueprint. So the new spinning-punch forming technology for aluminium alloy plate-wheels was researched and simulated. 3-D elastic-plastic finite element models were constructed and appropriate boundary conditions were given out. The results show that aluminium alloy plate-wheels with good quality can be formed by spinning-punch forming technology through controlling roller feed rate, roller'diameter, flanging times, and punching stroke, etc. And the relationships between spinning load and roller'diameter, rolled lip forming quality and flanging times are found.
Punch flanging technology for aluminium alloy plate-wheels rolled lip forming
Rolled lip is needed to enhance intensity, rigidity and aesthetic feeling of aluminium alloy plate-wheels. The exacting requirements of rolled lip make the forming technology complex. And the forming process is difficult to control. Punch flanging technology adopted to form rolled lip of aluminium alloy plate-wheels was researched and simulated. 3-D elastic-plastic finite element models were constructed and appropriate boundary conditions were given out. The reasons for edge collapse, conner collapse and out of tolerance of run-out in end face are analysed. The results show that rolled lip of aluminium alloy plate-wheels with good forming quality can be formed by one time darwing and 30°-60°-90° three times flanging technology. Introduction Aluminum alloys are widely utilized in automotive and aircraft industry due to their various advantages such as lightness, good forgeability, high wear resistance, etc.[1~3], In the case of wheels, the increased utilization of aluminum alloys relates predominantly to improved aesthetic appearance and design flexibility over the traditional stamped and welded steel wheels. Greater than 50% of the new cars in North America are now equipped with aluminum alloy wheels[4]. so, aluminum alloy wheels have a large market now. The aluminium alloy plate-wheels are a new kind of wheels without inner tube, but with light-weight, energy-saving and environmental protection, which is taking palce of forging and casting aluminum wheels in kart, sandbeach car, mountaineering car, golf car now. Aluminium alloy plate-wheels generally are welded together by two hemi-wheels fabricated by muti-passes plate-spinning technology[5]. Rolled lip is needed to enhance intensity, rigidity and aesthetic feeling of plate-wheels. Spinning is a conventional technology to form rolled lip, but the outline dimension and run-out of rolled lip in end face are difficult to meet the exacting requirements of wheels blueprint. In this paper, punch flanging technology is applied to form the rolled lip of aluminium alloy plate-wheels. Edge collapse, conner collapse and out of tolerance of run-out in end face generated in simulation and experiment. The reasons for the flaws were studied by finite element simulation and experiment methods. And the effect regularity of flanging times, mould angle and punch stroke on forming quality of rolled lip were discovered. Experimental The 6060-O aluminium alloy was applied for plate-wheels forming. The properties are shown in Table1. Proceedings of the 3rd International Conference on Material Engineering and Application (ICMEA 2016) Copyright © 2016, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). 420 Advances in Engineering Research, volume 103
A New Vacuum Pressure Infiltration CFRP Method and Preparation Experimental Study of Composite
In order to prepare a carbon-fiber-reinforced polymer composite (CFRP) with ideal microstructure and properties, a new vacuum pressure infiltration CFRP method is proposed based on an analysis of existing CFRP preparation process methods. Research on composite material preparation systems was carried out by using this new method principle. The system mainly includes a fiber pre-forming module, a vacuum heating infiltration module, a hot-press curing molding module, and a data acquisition control module. Under the conditions of natural curing at 0 MPa + 6 h + 25 °C, vacuum heating curing at –0.05 MPa + 30 min + 80 °C, and hot-press curing at 0.7 MPa + 5 min + 50 °C, a two-dimensional (2D) CFRP with excellent microstructure and properties was successfully prepared. Observing the microstructure of the prepared composite material, it can be found that the inside of the composite material was sufficiently and uniformly infiltrated, and common preparation defects such as holes and delamination were effectively controlled. Through the performance test, the bending strength of the material reached 790 MPa.