By properly determining the dimensions of the feeder and its neck according to the principle of pressure-controllable feeder to control the inner pressure of casting,the shrinkageless casting was obtained,and the process yield of the casting was increased.

The defects of blowhole shrinkage and boiling often occurr in the production of cast steel bracket,and the process yield is low,the core cost is high.

Influence of Sprue Section on Technological Yield in Investment Casting;

Manufacturing of mould for artworks based on rapid prototyping and tooling technology;

Surface treatment of zinc casting artworks such as electroplating and colouring processes as well as composition of the solutions is described.

By introducing the application of 3D scanner PIX-30 and computer aided engraving machine PNC2300A in model stupa s reverse engineering, this paper explained the common process of artwork s scanning, CAD model building and rapid prototyping manufacturing and points out the development direction of RE technology in artwork s design and manufacturing.

Also, the diff effectiveness of the toxicity changes according to diverse mixtures of technical products and the viruses.