| Chapter | Topic | Key Concepts Covered | | :--- | :--- | :--- | | 1 | Principles of Blanking and/or Piercing Dies | The fundamental mechanics of cutting sheet metal, including clearance, cutting forces, and the difference between blanking (cutting the desired part) and piercing (creating holes). | | 2 | Elementary Blank Dies and Pierce Dies | Simple die construction, focusing on the basic components needed to perform blanking or piercing operations in their simplest forms. | | 3 | Bending | The theory and practice of forming sheet metal into angular shapes, including allowances for springback and material thickness. | | 4 | Screw Holes and Dowel Holes | The proper specification and placement of screws and dowel pins, which are critical for die assembly, alignment, and disassembly for maintenance. | | 5 | Die Life | Factors affecting die longevity, such as materials selection, lubrication, and wear patterns, and strategies to maximize production runs before resharpening. | | 6 | Punches | The design, material, and mounting of the male component of the die that performs the cutting or forming. | | 7 | Punches Mounted in Punch Plates | How punches are securely held and aligned using a punch plate or punch holder, a key assembly technique. | | 8 | Pilots | The use of pilots to ensure accurate feeding of the stock material by engaging previously pierced holes, critical for progressive dies. | | 9 | Die-block Constructions | The design of the female component of the die, including types of die blocks (solid, sectional, insert) and their mounting. | | 10 | Strippers and Stock Guides | Mechanisms to remove the stock material from the punch after a cutting operation (strippers) and to guide the material through the die. | | 11 | Shedders and Knockouts | Systems used to remove the finished part from the die cavity after it has been cut or formed. | | 12 | Nest Gages | Locating devices that position the stock material in the correct location for a secondary operation. | | 13 | Pushers | Mechanisms for ejecting small parts or scrap from the die area. | | 14 | Die Stops | Devices used to control the feeding length of the stock material in a die. | | 15 | Stock Material Utilization and Strip Layouts | The strategic layout of parts on a metal strip to maximize material usage and minimize scrap, a critical factor in production cost. | | 16 | Die Sets | The standardized assembly of a die shoe, punch holder, and guide posts that ensures perfect alignment between the upper and lower halves of the die. |
The first step in die making is designing the die. This involves creating detailed drawings and specifications for the die, considering factors like the part's geometry, material, and production volume.
Heating the steel slowly to minimize thermal shock and distortion. basic die making ostergaard pdf
A hardened tool steel plate featuring the cavity profile. It must withstand immense shock and abrasive wear.
Force (Tons)=Perimeter of Cut×Material Thickness×Shear Strength2000Force (Tons) equals the fraction with numerator Perimeter of Cut cross Material Thickness cross Shear Strength and denominator 2000 end-fraction | Chapter | Topic | Key Concepts Covered
The heavy steel or cast-iron plates that form the frame of the die set. They are aligned via precision guide posts and bushings to prevent misalignment during the press stroke.
Die components are shaped using milling, turning, and grinding. | | 4 | Screw Holes and Dowel
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Die making is a complex process that requires careful planning, precision machining, and attention to detail. By following the basic principles outlined in this guide, die makers can create high-quality dies that meet the required specifications and production requirements.
Building a functional die involves a methodical sequence of toolroom processes.
Bullet-nosed pins used in progressive dies. They enter previously pierced holes to precisely position the strip before the subsequent punches make contact. Engineering Formulas and Calculations