Is there any paste available which can be used to fill in pits and cavities in iron castings before powder coating which can withstand the baking temperature of around 140deg C?
Nadi
How many times can a chill be re-used in moulds in ferrous foundry practices?
Is there any logic to restricting life of chills to four or five times?
Nadimuthu.
We are being fed from a 22Kv feeder and the sanctioned demand is 1750kVA. The fuse from the distribution side is 60A and on our side is 30 A. These are horn gap fuses.
When we raise our furnace load the fuse on both sides gets blown. This is in spite of the fact that all the OCBs in our side and...
We are using TC(Tungsten carbide)burrs for finishing work(fettling)on our castings using pneumatic grinders.
We find that there is loading(sticking onto the tools)of Aluminium which results in tool wear, excessive force used on grinder and therefore premature failure of the pneumatic tools.
We...
We are supplying a lot of A356 alloy castings in T6 condition.Our machining partner complains of shrinkage and blowhole and rejects the castings on many occasions.
Whereas when we do a rough machining of these bores and conduct a Dye Penetrant test, it does not reveal any porosity.
With joint...
We are trying out castings in ALMAG 35.But the trials are posing difficulties in 1.Metal flow getting choked up and 2.Heavy drossing.
The gating design has been changed to 1.1:1:1.2 with the runner as a choke and we have used Ceramic filter 75x75x13 on two sides of the runner.We have already...
Dear all,
We are using AlZn10Si8Mg alloy as per previous DIN1725 standard for our customers.
This alloy is not prescribed in the new EN1706 1998 standard but our customers still want it.
The problem is the yield of castings for this particular alloy is very low.
Also in the case of AlSi12(LM6)...
We have an order for supplying sand castings in Aluminium 319 alloy.Our customer wants to know what is the maximum stress to failure for a 20 million cycle loading?
Data available in the ASM Handbook "Specialty"Aluminium has information only for 5 million cycles/
Request help from some...
Dear Friends,
We have an order for sand casting in 771 alloy in T71 condition(.Aluminium).But the mechanical properties could not be attained.
WE have been asked by our customer to suggest an alloy that will have the same mechanical properties.
THe castings will undergo cyclic loading .WE...
We have used 771.0 al alloy for the first time for our sand casting process.While subjecting the castings to T71 process we have observed that the hardness achieved was only 65 BHN as against 120 specified.The alloy has been checked for chem composition from the casting cut-portion and found to...
I would like to know if there is a proven process for combining thermal decoring(removing core sand and recycling it ) and heat treatment(solutinising) of Aluminium castings?
We would like to know more about this process as it will reduce cycle time and also help in recycling of sand.
Nadimuthu.
WE have received some sample castings from our overseas customers and found that the areas where the chills have been placed have criss-cross markings indicating the serrations in chills.In India ,we have not come across any foundry with this practice.This has been observed in the Aluminium sand...
We have cast equivalent alloy to 356 Aluminium in sand casting ie AlSi7Mg.Its specified elongation value is 2%in fully heat treated condition(T6).But the value of elongation required for 356 is 3% which we are not getting.
The test bars are as per Foseco foundryman handbook specification...
