An Overview of the Precision Investment Casting Process Steps and Phases | GEMSONS

1
WELCOME

• An Overview of the Precision Investment Casting
  Process Steps and Phases

2
Introduction

• One of the oldest methods of making metal
  precision components is investment casting. The
  process starts with the creation of a wax
  pattern, which is a steel replica of the required
  component.
• The design is encased in a ceramic material,
  which is then heated to remove it. After that,
  molten steel will be poured into the mold's
  opening. After the solid steel mould has been
  ripped away, the casting is ready to use.
• Investment castings are made using a method
  called investment casting.
• The process begins with the creation of the
  master pattern. To create the one-of-a-kind
  pattern, the artist could use wax, clay, steel,
  plastic, or wood. He'll be able to make the mould
  or master die after that.
• This one is made of metal, steel, or metal. The
  steps and phases of investment casting are listed
  below.

3
STEPS INVOLVED IN INVESTMENT CASTING

• TOOLING
• Dies are made by skilled tool room technicians
  using CNC machining and EDM procedures.
• The majority of investment tools are composed of
  aluminum and have brass or steel cores as well as
  retractable slides.
• INJECTION OF WAX PATTERN
• To ensure dimensional homogeneity, liquid pattern
  wax is injected under temperature/pressure
  controlled conditions from the first to the
  hundredth injection cycle.
• When the wax construction has set, it can be
  readily removed from the die.
• ASSEMBLING THE STRUCTURE
• After that, the wax drawings are attached to a
  wax runner system, which allows the molten metal
  to flow freely.
• Using over 30 basic designs of runners, castings
  of varied sizes and sections can be built to a
  high degree of precision.

4
Continue

• Making Molds
• Following the completion and cleaning of the wax
  assemblies, a ceramic shell is constructed by
  repeatedly dipping the wax assembly in a liquid
  ceramic slurry and then coating it with ceramic
  stucco.
• The shell-making robot technology used to invest
  the assemblies is completely automated. The
  investment shell is built up in stages until it
  reaches a thickness that is thick enough to
  withstand the pouring's thermal stresses.
• De-Waxing
• The wax is steamed away from the investment shell
  in a steam pressure vessel, leaving the negative
  hollow spaces of the components within.
• Fire the Mould
• To remove wax residue, boost mechanical strength,
  and preheat in preparation for the casting
  process, Ceramic Shell moulds are burned at
  1000C.

5
Continue

• Coating of Shells
• In Shell coating, the pattern assembly will be
  dipped in a ceramic slurry and coated with a
  refractory material.
• Rep this process until the desired thickness and
  strength are achieved. After that, the ceramic
  shell is finished and placed in an
  atmosphere-controlled chamber to dry.
• Finishing
• After the metal has been set, the ceramic mould
  is removed and cleaned with pneumatic vibratory
  machinery.
• In preparation for heat treatment or quality
  assurance, the castings are cut away from the
  runner, fettled, and shot blasted.
• Treatment with Heat
• As cast constructions, castings are heat-treated
  to improve mechanical characteristics,
  machinability, and homogeneity.
• Heat treatment is carried out on-site in
  atmosphere-controlled furnaces.

6
Conclusion

• In the power generation and aerospace industries,
  investment castings are widely employed.
• They're utilized to make intricate structures for
  turbine blades and cooling systems, among other
  things. Blades that are directionally solidified,
  generally equated, and single-crystal are among
  the most common blades produced by the process.
• Military, medical, automotive, and commercial
  applications all require investment castings.