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Cast Iron Burner Head
Burner head is connected with the venturi,
it is an important part for the gas stoves. There are many types of
burner heads, such as round, circle, single plate, double plates,
multi furnace head etc. Most of burner heads were made by
sand casting processes
in China.
Cast Iron Material
The most common material for burner head is
gray cast iron ASTM A48 CLASS 25 B. This material is
equivalent to Chinese cast iron grade HT150 to HT200. Or, equivalent
to Germany standard GG15 to GG20. This material is very normal and
cheap, but it has good founding properties.
Sand Casting Process
Sand casting processes are suitable to produce burner head products.
If you want to meet high surface quality, e.g. smooth surfaces, and
less casting defects, then shell and core molding process is
necessary. Otherwise, normal green sand casting process is also
applicable. However, the green sand must have very fine and uniform
sand grain. Of course, shell molding
castings will be more expensive than green sand castings.
Machining Requirements
The main machining works are drilling the small vent holes on the
top of burner heads. One burner heads may have dozens to hundreds
small holes. So, need lots of drilling works. Moreover, more holes
will cause higher defective rate during machining process. Not every
foundry could drill them very well since dedicated and low cost
works are necessary.
Normal Casting Defects
The burner head castings shall be smooth, cleaned, free from harmful
porosity, cracks and inclusions, and any other
casting defects
detrimental to appearance and performance.
Normal defects found on burner heads will include sand holes, air
holes, broken vent holes, slag inclusion, deformation etc. The iron
foundries need carefully deal with the casting process, pouring,
sand cleaning, grinding and drilling works very carefully.
Prices of Burner Head
By shell molding process, the raw castings cost will be higher. The
machining prices will depend on the total amount of vent holes.
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