Casting Part 2 Introduces some common methods

Casting Part 2 Introduces some common methods

A) Casting in the sand

Materials produced by this method:

Most metals, especially ferrous metals and aluminum.
Production of parts made of lead, tin, zinc alloys, beryllium, titanium and Zirconia is difficult.

Model material:

Wooden model:
For low circulations
The wood blows after a while.

Metal model:
For high circulations
Has higher dimensional stability than wood

Economic characteristics:

Production rate 1 - 50 pieces per hour depending on size
Unemployment time a few days depending on the complexity of the part
Consumption of medium materials (30 to 50% of the material is wasted in the gates and in the riser)
This wasted material is recyclable.
مدل Model making is easy and can be reused.
Design change during possible operation
Suitable for medium circulation (usually 100 peces)
Low molding cost
The cost of equipment (furnaces, pots, etc.) (low
. Needs a skilled worker.
Payment can be high:
Payment includes: Gateway Removal and Riser
Pay levels
Remove the separation line

applications:

Gasoline engine blocks
Manifolds
Machine bedding
Pump body
cylinder head

Sample parts made:

Design features:

High complexity in design
possible
All levels must be fillet
To eat.
Important gateway system design.
Location of the separation line
Very important
Can be made of steel blades
Used to dissipate heat.

Added machining between 1.5-6 mm
Slope between 1 to 5 degrees
Minimum diameter of production holes
With 6 mm muscle
Minimum cross section thickness 3 mm
For non-ferrous materials, 6 mm
For ferrous metals
Weight between 25 gr - 400 tons

Qualitative features:

The sand must be carefully controlled.
The amount of torsion and contraction of the piece
The effect of cooling and solidification
The shape of the piece depends.
Inspection of important operations
High porosity and impurities
Piece defects can be with
Fixed welding
The surface of the grain piece is rough and rough

Inadequate mechanical properties
Medium level smoothness
Ra between 3.2-50 &mum

Sand properties:

Late melting
Adhesion
Permeability
Collapsibility

B) Shell casting

Materials produced by this method:

Most metals
Except
Tin
Roy
magnesium
Titanium

Beryllium Zirconia

Economic characteristics


Unemployment time from a few days to a few weeks depending on the complexity of the part
High material efficiency
Ability to use automation in high process
The model is easy to build and can be reused.
Design change during difficult operation
Suitable for medium to high circulation (usually 100 to 500 pieces)
Low to medium molding cost
High equipment cost
It needs a simple worker.
Low payment cost (usually no need to pay)

applications:

Small mechanical parts that require high precision
cylinder head
Chateau handle
Power transmission components

Design features:

High complexity in design
possible
Can be sharper corners than
Sand Casting
Many changes in cross section
possible
Location of the separation line
Very important
Can be made of steel blades
Used to dissipate heat.

Slope between 0.25 to 1 degree
Minimum diameter of production holes
With 3 mm muscle
Minimum cross section thickness 3 mm
For non-ferrous materials, 6 mm
For ferrous metals
Weight between 10 gr - 100 Kg

Qualitative features:

The amount of torsion and contraction of the piece
The effect of cooling and solidification
The shape of the piece depends.
Inspection of important operations
High porosity and impurities
Piece defects can be with
Fixed welding
Appropriate piece level
Mechanical properties better than
Casting in the sand
Medium level smoothness
Ra between 0.8-12.5 &mum
The piece may have bubbles
And increase porosity.

0 دیدگاه

افزودن دیدگاه


مقالات اخیر گروه