Squeeze Casting

The process is suitable for components with relatively thick wall sections with high mechanical properties, as for example required of safety components in automotive engineering. The cast components can be welded and heattreated, and they can be produced with near net shape. Aluminum alloys can be used which are difficult or impossible to produce by standard die casting.

Buhler selectively utilizes the advantages of the horizontal shot sleeve system.
Advantages using Buhler machines

• The velocity and pressure intensification profile matched to the component geometry can be programmed in very many discrete steps. Real time control maintains these parameters constant.
• Depending on the type of shot unit selected, it is possible to generate high pressure intensification values during the solidification phase.

Your benefits
• Low capital investment, as no special-purpose machines are required.
• Entering of future-oriented market segments using existing SC machines.
• Low maintenance and training requirements thanks to unified machine and die ranges.

Types of Molding sand in Casting Process

Types of molding sand:

 

  Green sand:

                                 Natural sand with moisture

 Dry sand:

                                Not suitable for large castings

Facing sand:

This sand is used directly next to the surface of the pattern and comes into contact with the molten metal when the mould is poured.

As a result, it is subjected to the severest conditions and must possess, therefore, high strength and refractoriness. This sand also provides a smoother casting surface and should be of fine texture. It is made of silica sand and clay, and some additives without the addition of used sand.

Facing sand is always used to make dry sand moulds while system sand is frequently used for green sand molding.

Parting sand:

This sand is used to prevent adhering of two halves of mould surfaces in each molding box when they are separated. Thus, to ensure good parting, the mould surface (at contact of cope and Drag) should be treated with parting sand or some other parting material.

It is also sprinkled or applied on the pattern surface (before the molding sand is put over it) to avoid its sticking and permit its easy withdrawal from the mould. The parting sand is fine dry sand.

Backing or floor or black sand:

This is the sand which is used to back up the facing sand and to fill the whole volume of the flask. Old, repeatedly used molding sand is mainly employed for this purpose.             

  Core sand:

                                The core sand mainly consists of silica sand and an organic binder, with very little, if any, clay content. The presence of clay in core sand reduces its permeability and collapsibility. The core sand may contain small percentages of other constituents also, to enhance its properties.            

 Loam sand:

                                50 % of clay and dried hard and using for large castings

 

 

 

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