Semi-Solid Die Casting

Based on the theory of stir cast invented by Mr. D.B. Spencer and M.C.Flemings,
the semi-solid die casting technic has been further developed and applied over
30 years world wide. The main principle of this technic is to perform a strong
stir during the metal phase change from liquid to solid, thus break the
cylindrical and dendritic crystal to achieve much smaller grain size. While
this phase still maintains certain flow property, the die casting could be
performed to the metal.

The Advantages Of Semi-solid Die Casting
The advantage of semi-solid die casting is contributed from the very nice
microstructure product it resulted in. As the rough big crystal was removed,
leaving small, even, dense structure metal, the final products possess a number
of the fine properties, and the casting process is more controllable as well.

Semi-Solid Forming Principle
The unique rheological and churning properties of non-dendritic semi-solid
metals (SSM) are used to control the quality of castings. The three stages of
liquid, solid, and semi-solid metals exhibit distinct physical properties, and
these properties have led to a variety of methods of solidification,
plasticity, and semi-solid metal forming. Semi-solid metals (alloys) are
internally characterized by the coexistence of mixed solid-liquid phases and
the presence of metallic liquids at grain boundaries, which vary in the state
depending on the solid phase fraction. It can be seen that at high solid phase
fraction, the liquid phase component is limited to some of the grain
boundaries; at low solid phase fraction, the solid phase particles are free in
the liquid phase component.

Advantages of Semi solid Die Casting
Higher viscosity than liquid metal, easier to control: less gas entrained in
the mold, less oxidation, improved processability, less mold bonding, higher
speed part forming, improved surface finish, easy automation, and formation of
new processing processes.

Lower flow stress than solid metal: semi-solid slurry has rheological and
thixotropic properties, very small deformation resistance, can form parts at
higher speeds and can perform complex part forming, shorten processing cycles,
improve material utilization, contribute to energy and material savings, and
allow high-speed forming of continuous shapes (such as extrusion) and low
processing costs.

Wide range of applications: all alloys with the solid-liquid two-phase area can
achieve semi-solid processing, can be applied to a variety of processing
processes, such as casting, rolling, extrusion and forging, etc., and can be
used for material compounding and forming.

Rayforce Manufacture is a private foundry manufacturer, we provide metal
casting china, vacuum die casting and etc. Want to know more? Please contact
us.

Minimum Order: 3000 metric tons

Click to Enlarge