Casting
1- process in pressure is applied to the liquid metal die casting
2- wax patterns (investment casting)
3- Another name for investment (lost wax)
4- Chaplets support and position cores
5- up to 2 kg requiring close tolerances Investment casting
6- will eliminate the need for an ingot (Casting)
7- Directional solidification (chills)
8- non-ferrous metals die-cast (Zinc).
Process for plastic Melding Molding
Process for metal Casting
9- Splashed metal by molten metal that does not refuse (cold shut).
10- bottom part of the flask (drag).
11- used to represent the finished item (pattern).
12- Metal is fed into the casting cavity through (gating system).
13- which produces bar (continuous)
14- upper half of a flask (cope)
15- Small metal supports which become part of the casting during
pouring (chaplet).
16- density towards the outside of the mold (centrifugal)
17- crystal structure of a casting mould wall (fine equiaxed grains).
18- . Shrinkage occurring in the casting process (3 stage).
Shrinkage stages:
Solid state Solidification Liquid state
19- manufacturing processes is producing complex shapes (casting)
20-
required when making a sand casting
Mold Pattern Flask
21- change of wall thickness is required in a casting (Large radii)
22- Wells outside the normal finished casting (shrinkage).
23- holes or cavities are required in the finished casting (core).
24-
Green sand is mixture
Clay water Sand
25- Fusion bonding creates a metallurgical effect similar (casting).
26- preferential solidification of castings(chills)
27- typical discontinuity encountered in casting: Unfused chaplets
28- defects occur only in castings: cold shuts
29- Casting cooling is as under Interior will cool last
30- One ton casting: sand casting
31- investment casting required no further machining
32- Finest smooth in casting process investment casting
33- vibrating water-cooled copper tubing Continuous casting
34- preferential cooling is casting chills
يتحرك باتجاه المنطقة األعلى حرارةGrain growth -35
36-
Permanent Die
- fine grain structure - Need pressure
يحتاج الى ضغط
- used for:
Cylinder head - need vent
يحتاج الى فتحات تهوية
Piston
- need hot chamber
Connecting rod of engine يحتاج غرف تسخين
No ferrous casting
Centrifugal Continues
- hollow product - solid bar
للمنتجات المفرغة
- density toward the outside - gear of small size
- used in wheel pulleys gear blank - Vibrating water-cooled
يستخدم مثال في التروس صغيرة الحجم يستخدم في العجالت والبكرات وفراغات
التروس
Investment
- wax pattern
نمط شمعي
- close tolerance
- no further maching
- finest smooth surface
- limited to small casting
used for:
- gas turbine backets
يستخدم لشفرات توربينات الغاز
- high cost
سعر عالي
- highest precision
يحتاج ضبط او دقة عالية
37- In comparison to parts produced by casting or forging interior quality
38- prevent shrinkage cavities by absorbing heat from the molten metal in the
center of the casting Internal chill
39- part of the casting where the gate or riser
provide a concentration point for discontinuities.
40- shrinkage occurs: before, during and after the transformation from
liquid to solid. (3 stages)
41- porosity in a casting gas evolution after solidification
42- solidification of a casting, the shrinkage cause cavities that are
enlarged by the evolution of gases.
43- placed in a mold cavity to increase the cooling rate at that point: chill
44- investment casting and the (lost wax process is precision casting).
45- in castings, produced during solidification, is called: shrinkage
46- Heat-absorbing devices inserted in the cast mold near the cavity chills
47-
Casting defect
Porosity Misrun cold shuts Hot tear Micro
shrinkage
48- form of inserts that exclude metal flow to form internal surfaces in a
casting core
49- discontinuities is not associated with castings laminations
50- diff between die and permanent casting is the mold in the die cast
process is destroyed after use
51- surface condition produced during casting of an ingot, caused
by hot molten splashing on the mold surface is called Blowhole
