| 摘要 |
1,129,701. Making mounting pads; pressing; swaging taps, drills; presses. MONARCH RUBBER CO. 17 Nov., 1965 [17 Nov., 1964], No. 48760/65. Headings B3A, B3C, B3H, B3N and B3Q. A tubular sleeve is formed from a sheet metal blank by forming a cylindrical hole in the blank and pressing the blank, in the region of the circumference of the hole, into the shape of a sleeve, the inner and outer walls of the sleeve being defined by inner and outer dies. The sleeve can then be bonded to a rubber block, reamed, and internally threaded to produce a composite article 2, Fig. 22. The blank 1b, Fig. 4, is positioned between a spring loaded ejector plate 49 and composite die 24, 25, the nose 50 of a punch 48 being located in a pierced and then sheared hole 22 of the blank. The tubular portion 34 of a piston 33 underlies the blank, the piston being hydraulically connected with a further piston 43. As a ram 46 is lowered, the rod 44 of a piston 43 is first contacted, resulting in a pressure being exerted hydraulically on the piston 34, the pressure progressively increasing on the die 48 forms a tubular part 57 (Fig. 7) on the blank. The die finally forms a chamfer 59 on the blank by means of a shoulder 54. The initial pressure of the fluid 38 can be adjusted by means of a supply unit connected to inlet 40, a bleed or pressure relief valve 68 also being provided. If the sleeve 57 requires to be accurately sized for length, the blank is pressed between further dies (Fig. 8, not shown), or the piston 33, incorporated in the existing press, is urged upwardly against the base of sleeve while the blank is held in position, the previously formed chamfer in each case being removed by the resulting metal flow. The formed blank, after bonding to a rubber block, Fig. 10, is reamed by a tool 84 to remove any rubber waste and also a thin work hardened skin of the sleeve. A thread is then swaged in the sleeve by a tool 85 without the removal of metal. More than one sleeve may be formed, if desired, in the metal blank, and the exterior of each sleeve may be threaded rather than the interior. When a bolt is engaged with an internal thread on the sleeve with a given torque loading a self locking action is obtained due to distortion of the sleeve. |
