| 摘要 |
<p>1289444 Making welding dies TRIUMPH RADIO FREQUENCY Ltd 22 Feb 1971 5086/71 Heading B3A [Also in Division B5] A welding die suitable for use in a radio frequency welding machine comprises a rigid metal base-plate 1 having a slot 2 therein and a metal strip 3 received in the slot and extending perpendicularly from one face of the plate 1, opposite sides of the strip 3 being fixed to the plate 1 at opposite sides of the slot 2. The plate 1 and the strip 3 may be made of aluminium, aluminium alloy or brass, and the slot 2 and the strip 3 are curved. To make the die, the slot 2 is formed by a die sinker or end mill and the strip 3 is bent to the required curved shape, inserted into the slot 2 and pressed down so that the edge 4 thereof is flush with a face 5 of the plate 1. Two series of spot welds 6, 7 and weld seams are formed using gas or electric welding. The outer edge 6 of the strip 3 is machine finished and may be formed with a cutting edge to both cut and weld or form a tear-seal or may be formed with imitation stitch markings to form an embossed weld. In a modification (not shown) the weld metal joining the plate 1 to the strip 3 penetrates to the face 5. In an alternative method of making the die, the edge 4 of the strip 3 is positioned below the face 5 during welding and is subsequently made flush with the face 5. In use, the die is positioned between two platens in a radio frequency welding machine used, for example, to form motor vehicle trim panels.</p> |
