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Cyclopedia of Mechanical Engineering; A General Reference Work on Machine Shop Practice, Tool Making, Forging, Pattern Making, Foundry, Work, Metallur

Cyclopedia of Mechanical Engineering; A General Reference Work on Machine Shop Practice, Tool Making, Forging, Pattern Making, Foundry, Work, Metallur


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About the Book

This 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. 1908 edition. Excerpt: ... is to be saved, and the blank is of no use, the face of the die is left perfectly flat and the end of the punch is sheared. Fig. 263. The cutting face of the die may be sheared by milling or planing to the desired angle which depends on the thickness of the stock to be punched and also the power of the press. A common method of shearing a die is shown in Fig. 267, which shows a section of a die used for punching a heavy spring. The end of the punch is left flat. The punching commencing at the center A, is continued with a gradual shearing cut as the punch descends until it reaches the ends BB, of the opening. The blank punched will be straight while the stock will bend somewhat unless it is quite stiff, in which case it springs back to shape when the pressure is removed. Fig. 264. When the punching requires an amount of power in excess of the capacity of the press, as in the case of the forging shown in Fig. 268, it is necessary to trim the flash occasioned by the process of drop forging, and at the same time punch the end to shape as shown in Fig. 269. It is obvious that the material removed is of no value as a product, and as it is necessary to use a light press, the die may be given a shear as shown in Fig. 270; thus making it possible to do the punching on a press whose capacity is not equal to the job if the die had been sheared as shown in Fig. 267. In order to facilitate the operation of grinding the face of a die, it is frequently made with a raised boss around the hole as shown in Fig. 271. Sectional Dies. In order to make it easier to work dies to shape, they are sometimes made in two or more pieces; these are fastened together when in use. In the case of a plain die of the form shown in Fig. 272, the die is made in two pieces...


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Product Details
  • ISBN-13: 9781231727973
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 84
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1231727977
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr


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