Journal of Modern Processes in Manufacturing and Production
Volume:2 Issue: 1, 2012

In this paper, Vacuum Assisted Resin Transfer Molding (VARTM) method was simulated by analytical solution. Then the effect of parameters like fiber density, distribution of layer thickness, perform layer thickness, resin viscosity was investigated theoretically. Obtained results show that by selecting optimum distribution layer thickness, increasing fiber volume fraction, reducing viscosity of resin, maximum speed could be achieved in the process in such a way by optimizing these parameters the production speed will be improved.

One of the bellows producing method is hydroforming process. Whereas some factor of hydroforming process specially internal pressure affects on final characteristics produced bellows such as bursting, wrinkling and wall thickness distribution. In this paper the effect of internal pressure factor in final quality of produced bellows will be investigated. In simulation of process, ABAQUS/Explicit version 6.9 code was used, and also experimental examinations for investigation the effect of this factor has done. The results obtained from methods of analytical, finite element and experimental in this paper has good agreement with each other. Also, the conclusions of this research for prediction of suitable forming pressure could be used as a basis of designing a new type of metal bellows.

The use of TWB has been developed in automotive industries because of it’s advantages such as reduction in weight, cost and fuel economy of vehicles. The main objective of the peresent work is to study the effects of weld zone, diffrence in surface coating and thickness ratio on the formability of TWB composed of AISI 304, SPCC and IF steel sheets. It was found that the narrow weld zone has little effect on the formability of TWB. Results of LDH testing of TWB reveals the formability of TWB decrease as the thickness ratio of sheet increases. Fracture in LDH testing of TWB that composed of steel sheets with different surface coating occured on uncoated sheet because of changing in surface friction conditions.

A new method for increasing LDR in deep drawing is application of anti-lock braking system (ABS) on blank holder. In this method, instead of applying a constant force on blank and control the metal flow, the ABS system holds and releases the blank several times (20 to 50 times) which results increasing LDR. This study investigates the effect of different parameters of ABS on improving the conditions of drawing and increasing LDR The results of steel sheet (ST14) with 0.5 mm thickness shows that for each velocity of punch there is an optimum frequency for ABS.The best condition for applying force of blank holder is create a constant gap and a variable gap with ABS system.

One of the disadvantages of conventional milling tools is to produce a large amount of heat in cutting zone and so making the tool warmer. As a result, the tool would be worn and its life time would be reduced. Therefore, in long time machining, it is essential to change inserts and tools, continiously. A milling tool with self rotary cutting inserts was designed and manufactured that enables inserts to turn around their axes (which is different from tool axis). This rotation causes the heat to dispread in whole cutting edge and increase tool life time. In this paper, the process of design and manufacturing of rotary milling tool is expressed. The surface finishing of machined Aluminium workpiece is perused with the ‘Full Factorial’ statistical experiment design. Milling Tool with Self-Propelled Cutting Inserts is manufactured for the first time in Iran and was docketed by the No.51358.

In recent years, in order to reducing die design and manufacturing costs, Multi point forming technique has gained an increasing interest because of its high flexibility. In this process, the conventional fixed shape solid die sets are replaced with a pair of opposite matrices of controllable elements. In this paper, the fundamental principles of multi-point forming was described and the possibility of forming the one sheet metal part by this technique was investigated experimentally and analyzed using finite element simulation. Wrinkles and dimples are the most typical defects in multi-point forming of sheet metal. By the proper selection of process parameters the sound cup with good surface quality and uniform thickness distribution can be formed. The results obtained demonstrated that multi-point forming technology can be used as an effective and economic tool to the forming of single parts with different shapes and is cost-effective.