Punch And Die Work

Author : E. R. Markham
Publisher :
ISBN 13 : 9781332347513
Total Pages : 58 pages
Book Rating : 4.3/5 (475 download)

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Download or read book Punch and Die Work (Classic Reprint) written by E. R. Markham and published by . This book was released on 2015-08-06 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Punch and Die Work Under the head of punch and die work is generally included all the various tools used in blanking pieces from commercial stock; bending stock to shape; drawing out articles from sheet stock; and all the different operations performed with punching, drawing and forming presses. The most common forms of tools to be considered are the dies used for blanking articles from sheet stock, called blanking dies. Blanking Dies A set of blanking dies consists of a male die, or punch, as it Is generally termed, and a female die, or die block. These terms are generally abbreviated and the set is called a punch and die. Blanking dies are generally considered as belonging to one of three classes: First, plain (or simple) dies; second, gang dies; and third, compound dies. When punches and dies are used in a punch-press, and are to constitute a part of the regular equipment of the shop, they are held in suitable permanent fixtures. Dies are held in position on the bed of the press by means of a "holdfast," the name of which differs in different shops. Some of the more common names are chair, chuck, bolster, and die holder. Dies large enough to warrant it are clamped to the bed of the press, thus doing away with the necessity for holders. Dies are fastened in place in the die holder by several methods, the most common of which is by means of screws, as shown in Fig.1, in which a is the die and the holder. Having screws on both sides, it is an easy matter to adjust the die, loosening the screws on one side, and forcing the die over by those on the opposite side. When the die is small, it is generally held in a shoe, as shown In Fig.2. The manner of fastening the die in the shoe usually depends on the designer. In some shops the shoe is dove-tailed as shown, the angle being from 10 degrees to 15 degrees less than a right angle; the slot is made somewhat tapering. The die is given a corresponding taper and angle on its sides, and, to fasten it in position, it is driven securely in place. The amount of taper given the slot in the shoe must not be great, or the die will jar loose when in use. A taper of one-half inch per foot of length answers nicely. In other shops the shoe is made with a groove, as described above, only it is from 1 to % inch wider than the dies, which are held in place by means of a taper key or wedge, as shown in Fig.3. When making this form it is necessary to make the dies of equal width on their ends. This method does not require so great a degree of accuracy when machining the die block. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.