Especially for alloys that are difficult to cut or press, this advantage is often prominent. In addition, precision casting can be used as waste material, saving all materials. Suitable for large production or small batch production.

Precision casting always has two sides, and investment casting also has some disadvantages, mainly as follows:

1. The investment casting process is complex with multiple working procedures, and the process affecting the quality of the casting is dominated by propylene. Strict control of all kinds of raw materials and technology exploration, in order to set production.

2. The casting should not be too large or too thick, so as not to affect the size M degree. At present, most castings under 5 kg are produced, ranging from large to over 100 kg.

3. Long production cycle.

Precision casting cooling speed surface, easy to cause the casting crystal consumption. Carbon steel castings are also easy to form laminated and broken layers.

Investment casting shortcomings with the development of its own technology is also improving. Since the late forties, the adoption of multi-layer shell has shortened the production cycle, reduced the material consumption, and reduced the production cost. The development of new mould material, refractory material, dry station and brake, the adoption of advanced casting method, vacuum melting casting technology, surface pregnancy refining technology, directional crystallization, thermal isostatic pressure and the adoption of advanced inspection technology, are more conducive to further improve and ensure the quality of dry casting, expand its application. Molten chess casting in the foreign development speed is very fast, has appeared many highly mechanized large-scale vehicles, some also established the full automation production level. However, its potential is still great, such as the solution of the casting according to the different objects of its democratic divided into two categories: one for aviation and from the day industry. One kind is used in general machine city manufacturing industry. From the general trend of development in recent years, the two types of castings have increased, especially for the general machinery manufacturing castings, precision casting than the ship space and skin day industrial development faster, especially non-ferrous metal pieces have significant long.

The former precision casting has been widely used in aviation and automobile. Tractor, steam turbine, hui steam turbine, mining machinery, agricultural machinery, textile machinery, machine tools, gongqi, edge well, instruments, medical equipment and other industrial departments as well as daily necessities, technology related products manufacturing.

In addition, some achievements have been made in the research of trial and rejoinder. For example, the unique style of water glass with high strength and the new process of rapid shell by the top method of etrowite silicate have played a great role in promoting the development of investment casting. In addition, in the substitution of materials, such as low molecular Lin field, rosin and clam instead of stearic acid; A lot of research work has been done on the use of quartz sand (powder) in daicun, such as yaochang, burnt gem, linsha, etc., on the use of poly taigrasp aluminum, crystallized version of aluminum, etc. At present, many factories have set up the brake shell assembly line, can burn pouring water line, and some factories have also used the single machine of the five clams shell. In order to fully develop the advantages of investment mold shih, we should further research and adopt new materials, new techniques and new equipment according to the conditions of Chinese investment and the development of industrial and agricultural production. Develop necessary testing instruments and equipment. Set necessary technical standards. For castings with high requirements, the most advanced soft technology should be adopted to improve the level of mechanization and automation in major processes (such as moulding, shell making, etc.) and processes with poor working conditions (such as pouring, peeling, sorting and finishing, etc.).