Precision casting
Precision casting is a precision modelling method to obtain the floorboard of the precision casting process. Include: investment casting, ceramic mold casting, metal mold casting, pressure casting, lost foam casting.
It includes: investment casting, ceramic mold casting, metal mold casting, pressure casting, lost foam casting.
Among the more commonly used is the investment casting, also known as the lost wax casting: choose appropriate casting material system (such as paraffin) made for investment; Touch on casting refractory coating and sand and refractory process, sclerosis type shell and dry; Then the internal casting melt away, get the cavity; Roasting shell in order to obtain enough strength, and the casting material, burning residual; Casting need metal materials; After shelling solidification cooling, deoxidization, can achieve the high precision finished products. According to the requirements of the product or heat treatment and cold working and surface treatment.
Precision casting and lost wax casting, its products are precision, complex, close to the final shape, can not machining or rarely used directly, so the investment casting is an advanced technology of formed near net shape.
In ancient China: Wang Ziwu ding banned, copper, bronze lions and so on, is the masterpiece of investment casting. Investment casting is used for industrial production since the 1940 s, after half a century has been developing at a rapid pace. Especially the European and American countries has developed rapidly. Department of investment casting used in aviation, weapons, is applied to almost all industrial sectors, particularly in the electronics, petroleum, chemical, energy, transportation, light industry, textile, pharmaceutical, medical equipment, pump and valve etc. In recent years is rapid development in our country.
Casting technology development makes the investment casting can not only production of small-sized castings, and can produce large castings, the largest outline of investment castings nearly 2 m size, and the minimum wall thickness is less than 2 mm. At the same time also more precision investment castings, in addition to the linear tolerance, parts can achieve higher geometry tolerance. The surface roughness of the investment castings is becoming more and more small, can achieve Ra0.4 microns.
Precision casting and lost wax casting, its products are precision, complex, close to the final shape, can not machining or rarely used directly, so the investment casting is an advanced technology of formed near net shape.
In ancient China: Wang Ziwu ding banned, copper, bronze lions and so on, is the masterpiece of investment casting. Investment casting is used for industrial production since the 1940 s, after half a century has been developing at a rapid pace. Especially the European and American countries has developed rapidly. Department of investment casting used in aviation, weapons, is applied to almost all industrial sectors, particularly in the electronics, petroleum, chemical, energy, transportation, light industry, textile, pharmaceutical, medical equipment, pump and valve etc. In recent years is rapid development in our country.
Revestment precision casting process refers to the wax to make model, such as its appearance is wrapped in a layer of clay refractory material, heat melt wax outflow, and the shell formed by refractory, again after the metal melt into the shell, after waiting for metal cooling will get the metal mould parts, refractory break the processing of metal is called precision casting technology, also known as investment casting or lost wax casting.
This ancient method has, in the distant centuries BC, the ancient Chinese working people created this lost wax precision casting technology, used for precision casting with a variety of fine decorative pattern and text tripod and vessels and other products. According to the expert appraisal, shells period unearthed bronze ware in China and in the spring and autumn when the tomb statue of plate manufacturing is using this very clever technology. Tomb statue of plate base for multiple mutually intertwined dragons, end to end, staggered up and down, form the middle hollow out multilayer moire pattern. These designs using ordinary precision casting process are hard to make out, and using the lost wax method of precision casting technology, 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. In many non-metallic metal jewelry and crafts manufacturing, using this method also has a long history, is still a lot of jewelry and crafts production of the main methods.
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