Cyclopedia of Mechanical Engineering; Tool Making, Metallurgy, Iron and Steel Volume 2

Cyclopedia of Mechanical Engineering; Tool Making, Metallurgy, Iron and Steel Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: Fig. 8. As the amount of clearance differs in various shops, and on different classes of work, no stated amount can be given for all cases; the amount varies from to 3. The latter is excessive and is seldom given unless it is necessary that, the piece punched drop from the die each time. If the die is milled as described above it will be necessary to work all cornel's to shape with a file. If a universal milling machine having a slotting attachment is used, the corners can be properly shaped and the necessary clearance given by using suitably shpaed cutting tools, and turning the fixture to the proper angle. Fig. 2lio shows a slotting fixture attached to a universal milling machine, while Fig. 266 shows a fixture known as a die simper which is also attached to a milling machine. Die blocks have their cutting edges beveled in order that the Fig. 262. blank may be cut from the stock by a shearing cut. Shear is given the face of the die to reduce the power necessary to cut the blank from the stock; thus enabling a press to punch a blank from thicker stock. It also reduces the strain on the punch and die. The face of the die is sheared when the blank, or piece forced through, is the product to be saved. But if the piece surrounding the blank 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, more

Product details

  • Paperback | 86 pages
  • 189 x 246 x 5mm | 168g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236625846
  • 9781236625847