tailieunhanh - Establish experimental system of sheet metal hydrostatic forming for stepped cylinder

In this paper, all devices in an experimental system are describes as well as accuracy assurance in sheet metal hydrostatic experiment are presented. | Journal of Science & Technology 122 (2017) 007-011 Establish Experimental System of Sheet Metal Hydrostatic Forming for Stepped Cylinder Nguyen Thi Thu*, Nguyen Dac Trung, Le Trung Kien Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam Received: November 21, 2016; Accepted: October 27, 2017 Abstract Hydrostatic forming is a deformation method which uses highly-pressed liquid to deform sheet metal following the shape of die. This method has been researched and applied in various industries of manufacturing cars, medicines, chemistry, military, and so on. However, in Vietnam, this method is still new and has not been researched specifically, leading to limited application into real manufacturing. In order to demonstrate specific influence of technological factors on sheet metal hydrostatic forming process, the study on influence of die structure and surface shape on forming ability in sheet metal hydrostatic forming base on the combination of simulation and experiments is needed. Therefore, it is essential that the initial experimental system must be established to research hydrostatic forming process. In this paper, all devices in an experimental system are describes as well as accuracy assurance in sheet metal hydrostatic experiment are presented. Keywords: hydrostatic forming, sheet metal forming, die, high pressure 1. Introduction 1 Hydrostatic forming has been studied in a number of institutes and universities in recent years. This is a technology of forming sheet metal which owns many advantages: has ability to form complexprofiled parts such as car shell, car structure (Fig. 1), convex and convey parts, conical or spherical parts, so on with good surface quality and few operations. Fig. 2. Research orientations in hydrostatic forming [1] As can be seen from Fig. 2, the research orientation on die and devices has not been paid much attention. Scientists have concentrated on optimizing die system, blank holders, .