Tool wear model is presented by firstly extracting power signal eigenvalue through tool wear analysis of special spiral rod milling,and then establishing the mapping between the signal eignevalue and the tool wear value.

In the process of milling special spiral rod,a comparative analysis of all kinds of signals that indicate the state of tool wearing has been made.

This paper analysises problems of the adaptive control of special spiral rod processing,brings forward an adaptive control system taking mental removal rate (MRR) as input,the vibration strength as output,establishes a method to caculate the MRR in processing and identifies the system and obtains the reference model based on the collection and disposal of vibration signal.

Three-dimensional finite-element analysis of taper screw stress of extruder for straw;

Analysis of the contact-track of multi-axis envelope milling abnormal spiral-rod

Study on multi-axis non-instaneous envelope milling abnormal spiral-rod

Research on Wear Mechanism of Conical Twin-screw;

According to the analysis of the geometry configuration and parameter of conical twin-screw and referring to the intermeshing mechanism of counter-rotating twin-screw,the configuration feature of each section of conical twin-screw and it's computer programs in forming the 3D solid modeling are analyzed.

Three-dimensional flow simulation of flight element in mixing zone of a conical twin-screw is performed with a finite element package,ANSYS.

New conical twin screw,namely conical twin screw with mixing elements is introduced.

Extrusion rate,melt pressure,flow profile and mixing effects of the conical twin screw with mixing elements were observed experimentally.