To custom investment castings, investment casting manufacturers
will all ask drawing from our customers. So how to design
drawing for investment casting? What should be made up of in an
investment casting drawing?
Software for design investment casting
Installing a software in the computer is the first step for
designing investment castings. Such software could be DXF,
Parasolid, Step, Iges, Solidworks, Catia, Pro-Engineer, ect. We
mostly use CAD software. But many old purchasers do not know how
to use such software, even computer, just drawing with hand, but
it is not so standard. So it is important to be skillful at
designing softwares.
Drawing number
The drawing number of each product should be different. Normally
drawing number consists of some letters and figures, like. When
communicate with customer, we will exactly know which product we
are talking about.
Mark main dimensions
Marking main dimensions is the most important step to design a
drawing. We could not mark all the dimensions in the drawings,
but some main dimensions are ok. By these main dimensions, we
will know the structure and gross weight, then we could judge
whether it is suitable for manufacturing with investment casting
process. If the product is very large, then we will advise sand
casting.
Mark dimension tolerances
To ensure assembling, we will mark dimension tolerance for some
dimensions after finishing making dimensions. We just need to
mark main dimension tolerances which may affect the assembling.
And in the bottom of the drawing, unspecified tolerances should
also be add. From those main dimension tolerances, we will know
if machining is required and where we need to do machining. And
finish machining job, what machining equipment should be
provided.
Material
According to usage of investment castings, proper material
should be marked also in a drawing. When choosing investment
casting material, we could combine the usage of product and
material properties. Like material for agricultural castings, it
is best to use some wear resistance, like 42CrMo, AISI8630, ect
to longer the serving life.
Weight
Marking weight for designed investment casting parts will make a
drawing more perfect. It will help investment casting
manufacture save much time when calculating the price.
Above are the main factors when designing drawing for investment
casting. My foundry could also help you design drawing according
to your sample if we manufacture investment castings.
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