Patent GB-1353262-A (GB)
Title: Method and apparatus for shaping the body of a can having a grooved neck
IPC: B21D19/06
Filed: 1972-08-04
Abstract: 1353262 Shaping can bodies; necking; rolling DAIWA CAN CO Ltd 4 Aug 1972 [6 Aug 1971] 36440/72 Headings B3A B3Q and B3M A method for shaping the body of a can having a grooved neck comprises subjecting a circular blank 102, Fig. 4, to drawing and ironing to form a body 106<SP>1</SP>, trimming the edge 111 of the body opening and subjecting the opening to pressure to crush any burrs (116), Fig. 5 (not shown) projecting therefrom to flatten the peripheral edge of the body opening. The neck may be formed by mounting the body 106<SP>11</SP>, which may be made of tin plate or aluminium, on a plate (117), Fig. 6 (not shown), which is elevated towards a neck-forming guide (118) with a recess (119) into which the edge of the opening can be deformed. The burr-crushing is carried out using burr-crushing means (A), Fig. 1, and supporting means (B). A ring 3 is rotatably and concentrically mounted about a shaft 1 on a ball bearing 2. A further ring 11 is rotatable about shaft 1, with a resilient body 7 between cylindrical portion 8 and the ring 11. A shaft 18, inserted through ring 11, is provided with a roll 14 which rotates around the shaft 18 by means of roller bearing 17. The roll 14 has an inverted truncated conical shape, its tapered surface matching a tapered portion 5 of the ring 3 and forming a space 20 into which the cylindrical body opening can be flattened. The body 10611 is supported on a stand 22 with a magnet 21 fixed therein-suitable for use with tin plate bodies. A stand utilizing vacuum suction is suitable for an aluminium body, and a pipe 32 can be provided which leads to a vacuum pump P operable by a timer. Alternatively, an index turret may be used to support the body. The burr-crushing apparatus (A), (B) may be mounted horizontally or vertically. In operation a can is placed on stand 22 which is raised until the body opening is pinched between surface 14a of the roll and the vertical face of the ring 3. More than one roll 14 may be used to pinch the opening. A shaft 19 is then rotated to cause rotation of the stand 22 and body 10611. The ring 3 rotates about shaft 1 as the body 106<SP>11</SP> rotates, and the rolls 14 rotate in the opposite direction as a result to effect flattening of the burrs. Upward and outward movement of the rolls 14 during the de-burring is absorbed by the resilient body 7 and a clearance 27 between rings 9, 11. In an alternative embodiment, Fig. 3 (not shown), the roll 14 is rotated with the cylindrical body 106<SP>11</SP> remaining stationary. The apparatus differs from that of the first embodiment in that a ring (33) rotatable by driving means (34) supports the ring 11 and rolls 14, -the shaft (36) remaining stationary along with a lower member (35) about which the body opening embrases when the stand 22 is raised. In operation, the driving means (34) causes rotation of the ring (33) whereby the resileint body 7 and rolls 14 rotate around the circumference of member (35) and shaft (36) to effect the de-burring. By flattening the burrs, damage to printing rolls 113 can be eliminated. Cylindrical bodies formed by both drawing and deep drawing may be shaped and de-burred using the above apparatus.