Also technology chain theory analytical method has been applied to analyze the type of error and hereditary method.

This allows the optimal coordination of product,material and technology,and thus shortens the technology chain.

In order to improve the solving efficiency and accuracy of each composition ring deviation in the process dimension chain,the equal-precise computing criterion is adopted.

Secondly,process dimension chain concerned with fitting margin is established,so the value of fitting loop of pre-fitting is derived.

It presents a direct and handy way pf drawing process dimension chain.

Discussion on three kinds of applications of technological dimension chain;

Technological dimension chain is traditionally calculated by means of a set of formulas.

Based on the principal regulation of that dimension obtained indirectly must have accumulated errors, this paper, by means of accumulated errors and generality, mainly discusses the essentiality of dimension chain and analyzes the establishment of closed loop that can embody accumulated errors in technological dimension chain.

This paper briefly introduces the graph theory, expounds the inter na l relations between the graph theory and the technical dimension chain, and desc ribes the method of resolving technical dimension chain by using graph theory th rough actual examples.

Calculating technics for several typical technologic dimension chains;

This paper discusses the conception on the graph-theory technique and how to de- termine the technologic dimension chain,and summarize the methods,stepts and points for attention of determining technologic dimension chain with examples.

Selective preference of machining process of part is necessary in process generation because of nonlinear machining process.