group H (1-4)Chapters 13, 14 and 15

group H (1-4)Chapters 13, 14 and 15 - Click to edit Master...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Click to edit Master subtitle style Chapters 13, 14 and 15 Group H(10/2/07) Mark Kevin Jin David Chapter 13- Multiple-Use-Mold Casting Processes Permanent-Mold Casting Reusable mold Gray cast iron, alloy cast iron, steel, bronze and graphite Initial Preheat Only Refractory Lined before every pour Accurate Surface Finish Life of the Mold Depends on: Alloy being cast (higher melting point = lower life) Mold Material (resistance to thermal fatigue) Temperature (Mold/Pouring) Mold Configuration (Wall thicknesses) Chapter 13- Multiple-Use-Mold Casting Processes Slush Casting Hollow castings Forms a shell Pour out excess amount Low-Pressure Casting Pressure Difference Causes the Flow Clean Metal Nonturbulent Mold Filling Longer Cycle Times Chapter 13- Multiple-Use-Mold Casting Processes Vacuum Mold Casting Variation of Low-Pressure Casting Vacuum is drawn on the Die Assembly Very Clean Metal Mechanical Properties Better than Low Pressure Casting Chapter 13- Multiple-Use-Mold Casting Processes Pressure Die Casting Forces the Molten Metal, through pressure, into the Mold (several thousand PSI) Done through a Plunger Excellent Detail with Long Mold Life High Production Rates Good Strength Dimensional Precision Parts Can Weigh 20lbs Chapter 13- Multiple-Use-Mold Casting Processes Pressure Die Casting Hot Chamber Die-Casting Fast Cycling Low Melting Point Metals Cold Chamber Machines For Metals not suitable for Hot Chamber Metal has been heated in a separate furnace and transported to the die-casting machine. Chapter 13- Multiple-Use-Mold Casting Processes Squeeze Casting and Semisolid Casting Gates are used to control metal velocities. After the mold is filled with molten metal a pressure (3000 to 25000 psi) is applied. Centrifugal Casting Hollow Parts The Metal gets flung against the wall of the mold. Interior Profile is always round Gun barrels, pipes, tubes Chapter 13- Multiple-Use-Mold Casting Processes Continuous Casting Normally Creates the basic shape so that deformation processes are easier. Fast Repetition of Parts Same dimensions Chapter 13- Multiple-Use-Mold Casting Processes Induction Furnaces Popular High frequency electrical current passes through a coil, creating an alternating magnetic field. This magnetic field induces secondary electrical current in the metal which causes the metal to melt and stay at a liquid form. Keeps a large amount of metal in the liquid state at one time. Chapter 13- Multiple-Use-Mold Casting Processes Cleaning and Finishing Removing Cores (mechanical shaking) Remove Gates and Risers Cleaning the surface Repairing any defects Click to edit Master subtitle style 14.1 Introduction: Fabrication of plastics, ceramics and composites From raw material to finished product in one operation Materials design to their limits Finish operations often unnecessary 14.2 Fabrications of Plastics14....
View Full Document

Page1 / 41

group H (1-4)Chapters 13, 14 and 15 - Click to edit Master...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online