Diemaking and Die DesiignThis historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ... (see Fig. 27) and operate the pawl carrier as previously mentioned. The bolt X provides adjustment for this driver. The hardened rod Y serves to release the locating lever L on the lower member so that index plate / may be revolved. The operation of the dies is as follows: When the upper member descends, the successive drawing operations on the six parts are performed (assuming that the die is completely loaded) and at the same time plate E and index pawl F are turned backward into engagement with the next tooth / on plate / preparatory to indexing. The rod Y also engages the end of locating lever L and withdraws it from the index plate. When the upper member ascends the drawn parts are stripped from the punches and dies, and plate E, with index pawl F, is turned forward, thus indexing the six drawn pieces from one die to the next by the rotation of index plate /. When lever L is released by the upward movement of rod F it drops into a notch and accurately locates and locks the index plate in position. This cycle of movements is repeated for each stroke of the press. In designing this die, one of the points which had to be considered very carefully was to secure a rapid and positive stripping action for the dies in the upper members; in fact, the drawn parts have to be stripped from the dies as soon as the press slide starts upwards so that the work will not be disarranged by being carried up out of the index plate. This positive stripping action was effected by means of plate U in conjunction with three levers or pawls R. These levers are pivoted to the lower member and as the upper member descends they are forced outwards by three cams Ci. At the end of the downward movement, levers R are in engagement with plate U, as the... |
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Diemaking and Die Design: A Treatise on the Design and Practical Application ... Franklin D. Jones No preview available - 2016 |