| 摘要 |
1485098 Tube expanders; stamping; punching ROTHENBERGER GmbH & CO WERKZEUGEMASCHINEN KG 15 Jan 1976 [15 March 1975] 01655/76 Headings B3Q B3J and B3W In a tube expander comprising segments 29, Fig. 1, expanded by a tapering mandrel 14 operated by a cam 18, stroke of the mandrel is increased by providing several recesses in which a pivot 20 for the ram may lodge consecutively. The recesses may be staggered, Fig. 1, or disposed in an oblique row, Fig. 3 (not shown). A bronze bush 34 may surround the mandrel 14 and receive one or more light return springs 37 for the mandrel. At least one stiff return spring 40 is located above springs 37. A spacer 61, Fig. 5, facilitates the use of smaller segments 29 which are operated only by the leading part of the mandrel. A pyramidal mandrel may be used in which the end 15a of square, hexagonal or octagonal cross-section, may be pivoted to the rest of the mandrel. To convert the tool for punching or embossing, the head 25 carrying the expansible jaws 29 is replaced by an adapter 48, Fig. 4, carrying a punch 55 and a die 57. A plunger 49 carrying the punch 55 is recessed 50 to receive the end of the mandrel 14. |
