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and the friction between the deforming material and the extrusion tooling. The extrusion process optimization actually concerns the interplay between these two variables in relation to the peak pressure... Materials and geometry AZ31 was used as an example billet material in this research. The H13 tool steel was used as the tooling material for the die, container and stem. Table 1 lists the physical......
; 1 INTRODUCTION The development of coating technology provides a great opportunity for rapid tooling... tooling for polymer injection moulding, and the service lifetime is improved to a certain extent. However, such problems as crack, warp and shed can not be solved in the fabrication of large moulds......
orifice. Mechanical and tribological interactions between the billet and the extrusion tooling (stem, container and die) result in complex compressive and shear stresses. The process is further complicated... into a cross-shaped profile as illustrated in Fig. 2. By taking advantage of its symmetry, only 1/8 of the billet, extrudate and extrusion tooling were modeled, which considerably reduced......
is a triple nonlinear process. The features of large diameter and low elongation make the bending of LDTW Al-alloy tube much sensitive to the changes of forming parameters, viz, tooling parameters... uncontrollable variables induced by material fabrication processes, tooling manufacturing and bending processes, which may influence the bending quality and forming efficiency. Thus, it is urgently......
conducted on a self-developed free hydraulic bulging tooling, as shown in Fig.2. This tooling employs internal hydraulic pressure source and requires no complicated and expensive hydraulic pressurization circuit which is usually composed of air-assisted pumps, pressure control valves, flow control valves and associated plumbing, etc. As a stand-alone unit, the tooling can be worked on a conventional......
Hardness of the tooling’s lower punch was measured after 50 cycles of forming. Fig.8 shows the hardness measured on the punch. Fig.8 Hardness measured along the lower punch after 50 parts forming... low to guarantee the tooling integrity. 2) Hardness can be increased by surface treatment, as nitriding, glazing or oxidation. The problem is to keep a good adherence of the coating or a good stability......
, thickness t is 1mm, the bending radius R is 57 mm. The bending angle is 90?. The tooling parameters are shown in Table 3 and Table 4. Different friction levels are adopted to lubricate various contact interfaces. The mandrel extension e is adopted to control the wrinkling. Fig.3 shows that when e is less than 0 mm, the wrinkling is provoked. Table 3 Tooling geometry dimension Table 4 Mandrel......
the tooling necessary to manufacture the impeller, consisting of 14 petals, 2 split plates and a clamping ring. The blades of the impellers are essentially cast net-shape. The steel tooling shown... the castings. Fig.5 Steel tooling used to cast impellers: (a) CAD model; (b) Photograph Fig.6 Progressive filling of semi-solid impeller die, demonstrating controlled flow Testing has shown......
pressure of liquid media and axial feeding and transversal stroke on defects are investigated using numerical simulation and experimental method. The tooling corner radius that apparently influences... ratio 4 Experimental 4.1 Machine and tooling The experiment research was conducted in the machine manufactured by Harbin Institute of Technology. Fig. 7 Effect of die inner bend corner radius It consists......
to reduce springback. References [1] ANAGNOSTOU E L. Optimized tooling design algorithm for sheet metal forming over reconfigurable compliant tooling[D]. New York: State University of New York, 2002..., CHOU T S, CHOU S S. On the deformation texture of square-shaped deep-drawing commercially pure Ti sheet[J]. Materials Chemistry and Physics, 2002, 77(3): 765-772. [18] CAO J. Reconfigurable tooling......
