Papers by Author: Jun Fan

Abstract: The conventional precision analysis method of modification and design is qualitative, laborious and time consuming. The precision of reverse parametric modification have direct influences on the quality of the reversed products. In this paper, a quantitative analysis method based on a reverse parametric approach and precision control concept is proposed. Combining with the ATOS scanner system, analyzing every aspect of the precision control and the error distribution, including data acquisition process, reverse reconstruction process and parametric process. In the process of the product reverse parametric modification, general error distribution is mainly composed of data acquisition error, reverse reconstruction error and parametric error. The method of precision control during the reverse parametric modification process is analyzed, according to this method, the total error of parametric modification for die face is 0.089mm, is lower than the accuracy requirement of 0.10mm in the reverse parametric modification process, the reverse modification of the die face of the blade based on precision control is realized. Validity and effectiveness of the method has been confirmed by case studies.

Abstract: To obtain the know-how of the deficiency for the filling capability, taking Ti75 alloy as the research object, at the same height of reducing, strain rates during forming as the control objective, the finite element numerical simulation method was used to simulate the hot compression with DEFORM-3D, analyzing the effect of the strain rates on the distribution of strain and stress.

Abstract: The filling capability is important for forging die design, which influences the quality and life of the die. To obtain the know-how of the deficiency for the filling capability, numerical simulation was performed to analyze the hot compression of Ti75 alloy with DEFORM-3D. In the simulation, the reducing height and work-piece dimensions remain the same. We obtained the results including the process of hot compression, the forming behavior of the work-piece and the effect of work-piece dimensions on the distribution of the stress and strain.

Abstract: The filling capability of forging die is the key to design forging die and it exerts an important influence to the quality and life of die. In response to the difficulty in filling of forging die, and taking forged Ti₃Al alloy as the research object, at the same height of reducing, strain rates during forming as the control objective, the finite element numerical simulation method was used to simulate the hot compression of Ti₃Al alloy with DEFORM-3D. This test simulated the process of hot compression, analysed the hot compression behavior of the stuff and discussed the effect of strain rates on the variety and distribution of stress and strain.

Abstract: The filling capability of forging die is important to design forging die and it exerts a decisive influence to the quality and life of die. Due to the deficiency of the filling capability, and taking Ti₃Al alloy as the research object, at the same height of reducing, work-piece dimensions as the control objective, the finite element numerical simulation method was used to simulate the hot compression of Ti₃Al alloy with DEFORM-3D. This test simulated the process of hot compression, analyzed the hot deforming behavior of the stuff and discussed the effect of work-piece dimension on the variety and distribution of stress and strain.