Pressured-assisted injection forging of thick-walled tubes

Pressurising materials and process design considerations of the pressure-assisted injection forging of thick-walled tubular components

“…1) [7][8][9]. Using this configuration, the forming process may be controlled by using pre-determined combinations of the pressurisation and injection and, hence, the quality of the product (e.g.…”

“…A further development was to introduce a pressurising medium to effect the forming of hollow flanges-pressure-assisted injection forging (PAIF) (Fig. 1) [7][8][9]. In this process, a pressurising material is inserted into the tube to prevent the collapse of the tube: the tube is contained in the injection chamber before being injected into the die-cavity, the injection chamber providing additional stability for the tube.…”

“…For small batches of production, polymers may have advantages over hydraulic media, the avoidance off problems such as sealing requiring only simple tools, machinery and controls [11]. Since the forming thick-walled tubes invariably requires fine control on the deformation of both the pressurising material and the work material, the development of the proposed technology [7][8][9] would require wider ranges of investigation of the performance of the polymers as the pressurising medium of the process. Depending on the component-form to be produced and the work-material used, the type of pressurising material to be used will have to be determined with reference to the forming process [12].…”

Upper-bound analysis of the pressure-assisted injection forging of thick-walled tubular components with hollow flanges

“…Polymers may have advantages over hydraulic media: avoiding problems such as sealing and only requiring simple tools, machinery and controls [10]. The forming of thick-walled tubes, however, invariably requires fine control of the deformation of both the pressurising material and the work material, and the development of the proposed technology [5,6] would require wider ranges of investigation into the performance of the polymers used as the pressurising media for the process [11]. The research conducted so far has enabled a good understanding on the process.…”

“…A further development was to introduce a pressurising medium to effect the forming of hollow flanges-Pressure-assisted injection forging (PAIF) (Fig. 1) [5][6][7]. In this process, the pressurising material is inserted into the tube to prevent the tube from collapsing; the compound tube being contained within the injection chamber before being injected into the die cavity.…”