Skip to main content

MANUFACTURING PROCESS - INVESTMENT CASTING PROCESS


INVESTMENT CASTING PROCESS

THE ROOT OF THE INVESTMENT CASTING PROCESS, THE CIRE PERDUE OR “LOST WAX” METHOD DATES BACK TO AT LEAST THE FOURTH MILLENNIUM B.C. THE ARTISTS AND SCULPTORS OF ANCIENT EGYPT AND MESOPOTAMIA USED THE RUDIMENTS OF THE INVESTMENT CASTING PROCESS TO CREATE INTRICATELY DETAILED JEWELRY, PECTORALS AND IDOLS. THE INVESTMENT CASTING PROCESS ALOS CALLED LOST WAX PROCESS BEGINS WITH THE PRODUCTION OF WAX REPLICAS OR PATTERNS OF THE DESIRED SHAPE OF THE CASTINGS. A PATTERN IS NEEDED FOR EVERY CASTING TO BE PRODUCED. THE PATTERNS ARE PREPARED BY INJECTING WAX OR POLYSTYRENE IN A METAL DIES. A NUMBER OF PATTERNS ARE ATTACHED TO A CENTRAL WAX SPRUE TO FORM A ASSEMBLY. THE MOLD IS PREPARED BY SURROUNDING THE PATTERN WITH REFRACTORY SLURRY THAT CAN SET AT ROOM TEMPERATURE. THE MOLD IS THEN HEATED SO THAT PATTERN MELTS AND FLOWS OUT, LEAVING A CLEAN CAVITY BEHIND. THE MOULD IS FURTHER HARDENED BY HEATING AND THE MOLTEN METAL IS POURED WHILE IT IS STILL HOT. WHEN THE CASTING IS SOLIDIFIED, THE MOLD IS BROKEN AND THE CASTING TAKEN OUT.
THE BASIC STEPS OF THE INVESTMENT CASTING PROCESS ARE 
  1. PRODUCTION OF HEAT-DISPOSABLE WAX, PLASTIC, OR POLYSTYRENE PATTERNS
  2. ASSEMBLY OF THESE PATTERNS ONTO A GATING SYSTEM
  3. “INVESTING,” OR COVERING THE PATTERN ASSEMBLY WITH REFRACTORY SLURRY
  4. MELTING THE PATTERN ASSEMBLY TO REMOVE THE PATTERN MATERIAL
  5. FIRING THE MOLD TO REMOVE THE LAST TRACES OF THE PATTERN MATERIAL
  6. POURING
  7. KNOCKOUT, CUTOFF AND FINISHING. 



References :- www.nptel.iitm.ac.in
Labels:

Comments

  1. Investment Castings30 September 2013 at 12:59

    Trident Steels handles a wide variety of metals, such as stainless steels, wear-resistant steels & so on, to produce top-quality Stainless Steel Investment Castings in all common alloys.
    for more details:
    http://www.tridentinvestmentcastings.com/

    ReplyDelete

Post a Comment

Popular posts from this blog

APRON MECHANISM IN LATHE

APRON MECHANISM IN LATHE Apron Mechanism: Apron is attached to the carriage and hangs over the front side of the lathe bed. It is useful in providing power and hand feed to both carriage and cross-slide. It is also used to provide power feed to the carriage during thread cutting through two half nuts. The construction of apron is shown in Fig. Fig - Apron Mechanism Construction Power is transmitted from the spindle to the lead screw and feed rod through the spindle gear and tumbler gear arrangement. A worm is mounted on the feed rod by a sliding key. The worm meshes with a worm gear on whose axis another gear G1 is attached. Gear G1 is attached to a small gear G2 by a bracket as shown in the diagram. Gear G4 is positioned to be in mesh with the rack gear always. Another gear G3 is mounted on the same axis of gear G4. The carriage hand wheel meant for longitudinal feed is attached to the gear G5 on the same axis. The gears G3 and G5 are always in mesh. The gear G...
16 comments
Read more

DOM MANUAL / B-TECH / MECHANICAL / KUK - TO FIND THE SPEED AND TORQUE OF DIFFERENT GEARS IN AN EPICYCLIC GEAR TRAIN.

OBJECTIVE: TO FIND THE SPEED AND TORQUE OF DIFFERENT GEARS IN AN EPICYCLIC GEAR TRAIN. SPECIFICATIONS : 1.       GEAR TRAIN : SUN GEAR : 14 TEETH 2.       PLANT GEAR: 21 TEETH (2 NOS.) 3.       INTERNAL GEAR WITH : 56 TEETH TORQUE MEASUREMENT ·          INPUT TORQUE – MOTOR CURRENT CALIBRATED FOR MOTOR TORQUE. ·          PLANT CARRIER - PULLEY OF 50 MM DIA AND SPRING BALANCE. ·          INTERNAL GEAR - PULLEY, 120 MM DIA AND SPRING BALANCES. Ø   BOTH PULLEYS ARE PROVIDED WITH ROPE OF 12 Ø   MM DIA Ø   DRIVE MOTOR - 1HP DC MOTOR RPM MOTOR OPERATING ON 220 VOLTS Ø   50 HZ SUPLLY, DRIVING THE SUN GEAR. CURRENT(AMPS) TORQUE 1.00 0.5 1.20 1.5 1.40 2.5 ...
357 comments
Read more

Boiler Mounting - Water Level Indicator

WATER LEVEL INDICATOR Function:   It is indicates the water level inside the boiler to an observer. Working:  The water of the boiler comes into the glass tube through the lower tube and the steam through the upper tube. The water then stands in the glass tube at the same level as in the boiler. Two cocks are used to control the passage of between the boiler and the glass tube while the third cock is in used to discharge some of the water from inside the boiler to see whether the gauge is in proper order or not. The glass tube is protected by means of a cover, made of specially toughened glass, which will prevent any accident that may happen due to breaking of glass tube. It is used for ordinary boilers. Image - Water Level Indicator Figure - Water Level Indicator
3 comments
Read more