Chapter 14 Forging Flashcards
Forging
Forging is a basic process in which the workpiece is shaped by compressive forces applied through various dies and tooling.
Forging produces discrete parts with what characteristics?
forging produces discrete parts with good strength and toughness because the metal flows in a die and the material’s grain structure can be controlled.
what’s the difference in cold forged parts vs. hot forged parts?
A 16 bit A/D converter has an input range of 0 to 5 V.
Estimate the quantization error (as a percentage of reading)
for an input of 2.72V.
What is open die forging?
In its simplest form, open-die forging can be described by a metal workpiece blank, placed between two flat dies (platens), and reduced in height by compressing it (Fig. 14.3), an operation that is also called upsetting or flat-die forging.
Cogging
also called drawing out, is basically an open-die forging operation in which the thickness of a bar is reduced by successive forging steps (bites) at specific intervals
Friction Hill
Refers to the graph of pressure when open-die forging. Since the pressure of forging caused by friction is greatest at the center of the piece the graph forms somewhat of a hill.
what is fullering and edging?
they are preforming operations (Figs.14.8b and c) are typically made to enhance the distribution of the material into various regions of the blank. In fullering, material is distributed away from a die region; in edging, it is gathered into a localized region.
What are the steps of Impression Die Forging?
1 Blank
2 Performing operations - edging or fullering
3 blocking
4 Finishing
5 Trimming
what are the 3 main differences in Precision Forging?
Precision forging requires (a) special and more complex dies, (b) precise control of the blank’s volume and shape, and (c) accurate positioning of the blank in the die cavity.
