What Can Affect the Quality of Iron Castings?
The quality of
iron castings is
very important to the development of an
iron foundry, and there are many elements that influence
the quality of iron castings, such as design process, casting
process, the quality of raw materials and technological operation.
1. Design process of the iron castings
During the design process, in addition to
determine the shape and size of iron castings based on the working
conditions and the property of metal materials, we should also
consider the rationality from the perspective of casting alloy and
characteristics of iron castings, that is obvious size effect and
stress and other issues in order to avoid or reduce the casting
composition segregation, deformation, cracks and other
metal casting defects.
2. Reasonable casting process
casting process is
very important, that is according to the casting structure, weight
and size, characteristics of casting alloy and working conditions,
we should choose a suitable parting and molding, core-making method
to design casting bars, iron chill, and riser and gating systems.
3. Quality of raw materials
The third is the quality of raw materials
used in metal casting. Metal
charge, refractory material, fuel, flux, modifier, foundry sand,
molding sand binder, paint and other materials, if any of them is
not up to standard in quality, air hole, pinhole, slag inclusion,
adhering sand and other casting defects will appear, which will
affect the appearance and internal quality of castings, even cause
4. Technological operation
The fourth element is the technological
operation. A reasonable operation process should be made to develop
rules to enhance the technical level of workers, and make sure the
engineering procedure to be implemented correctly.
In order to control the quality of iron castings, the inspection is
very necessary and important.
First, we should formulate control and inspection codes and
engineering factors about the raw materials, auxiliary materials
even each specific product process. Each process is strictly
controlled and inspected according to inspection codes and technical
Then, we should inspect the finished castings. We can use reasonable
testing methods and allocate appropriate testing staff. About the
presentation quality of castings, we can use comparison specimens to
judge surface roughness; the hair line on surface can be examined by
staining method and magnetic particle method. About the internal
quality, we can use frequency, ultrasound, whirlpool, x ray and y
ray and other methods to test and judge.
Ultrasonic inspection device
Magnaflux inspection device
X ray testing device