Lost wax casting now called revestment precision casting, is a less cutting or no cutting casting process, is an excellent technology in foundry industry, its application is very extensive.
It is not only applicable to the various types, various kinds of alloy casting, and produce the casting dimension accuracy and surface quality is higher than other casting method, even other casting method is difficult to cast the complex, high temperature resistant, not easy machining
castings, all can use revestment precision casting wrought.
Revestment precision casting is developed on the basis of ancient lost wax casting.
As ancient civilizations, China is the use of this technology is one of the early, long centuries BC, the ancient Chinese working people created this kind of lost wax casting technology, used for casting tripod with a variety of fine decorative pattern and text and household utensils and other products, such as the tomb when the spring and autumn period and the statue of plate, etc.
Tomb statue of plate base for multiple mutually intertwined dragons, they end to end, staggered up and down, form the middle hollow out layers of moire pattern, these designs using ordinary casting process are hard to make out, and with the method of lost wax casting process, can make use of the characteristics of paraffin wax no strength, easy to carve, carved with ordinary tools can and want to get the tomb of paraffin wax material arts and crafts of the plates, then additional gating system, coating, dewaxing, pouring, beautiful tomb statue of plate can be calculated out.
Modern investment casting methods have been proved in practical application is in the 1940 s.
At that time, the development of the aviation jet engine, to produce complicated shape, such as blade, impeller, nozzle, size precision and the surface is bright and clean heat resistant alloy parts.
Due to heat resistant alloy materials difficult to machining, complex shape parts, so that can't or difficult to use other methods, therefore, need to find a new precision forming technology, then draw lessons from the ancient tradition of lost wax casting, after improvement of materials and technology, modern investment casting method on the basis of ancient technology for the development of the important.
Therefore, the development of the aviation industry to promote the application of investment casting and investment casting of continuous improvement and perfect, also for the aviation industry to further improve performance have created favorable conditions.
Our country is in the last century five, 60 s investment casting was applied to industrial production.
Within this advanced casting process with the development of the huge, successively in the aviation, automobile, machine tools, ships, internal combustion engines, gas turbines, telecommunications equipment, weapons, medical equipment and tool widely used in manufacturing industry, also used for manufacturing arts and crafts.
Investment casting process, the so-called simple said is with fusible materials (
Such as wax material or plastic)
Made of meltability model (
Investment pattern or model for short)
, on which the coated with several layers of tailor-made refractory coating, after drying and hardening type to form a whole shell, reoccupy steam or hot water from the melt in the shell model, and then put type shells in the sand, dry sand by filling in all round its modelling, finally will be cast into the furnace after high temperature roasting,
When such as using high strength shell, but don't have to modelling and will release the shell directly after roasting)
Type, mold or shell after roasting, and are casting in pouring molten metal.
High dimensional precision investment castings, generally can reach CT4 ~ 6 (
Sand casting is CT10 ~ 13, die-casting is CT5 ~ 7)
, of course, due to the complexity of investment casting process, factors influencing the dimension accuracy of castings is more, such as mold material shrinkage and deformation of casting, shell in the process of heating and cooling line quantity change, alloy of shrinkage and deformation of the casting during solidification, etc. , so ordinary size although higher precision investment castings, but still need to improve the consistency (
The medium and high temperature wax casting dimension consistency to improve a lot)
Suppress moudle, will use the cavity surface finish high pressure type, as a result, the casting surface finish.
In addition, the shell consists of high temperature resistant special mixture of the binder and refractory refractory coating coated on the casting and made, direct contact with molten metal inside the cavity of high surface finish.
So, the surface finish of investment castings is higher than the general casting, general of Ra.
6 to 3.
Investment casting the biggest advantage is due to the investment casting with high dimensional accuracy and surface finish, so can reduce machining work, only in parts a little higher requirements on the parts machining allowance, and even some castings only grinding, polishing allowance, don't need to machining can be used.
Using investment casting method, therefore, can be a lot of saving machine tool equipment and processing time, greatly saving metal materials.
< em> < / em> investment casting method of another advantage is that it can cast all kinds of alloy of complicated casting, special casting high temperature alloy castings.
Such as jet engine blades, its streamlined profile and cooling with lumen, hardly formed by machining process.
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