AISI-1045, 1025 steel stamping simulation 00050,hollister, China) Abstract: AccordingtothecharacteristicsofthemotorbikeSprofilemodifiedgear, awarmforgingprecisionformingprocesswasestablishedthroughanalyzingandcomparingthepossibleprocesses, whichcouldproducetheproductwithhighqualityquickly. Anewinsertingblockmouldstructurewasputforwardtosolvetheproblemsofbadlymouldwornoutandhighproductioncost, etc. Theformingprocesswasoptimizedbysettingupaboostingstructure. ThefeasibilityoftechnologywassimulatedbyFEMsoftwareanditsresultwasvalidatedinrealproduction. Sothelowcostgearwithgoodperformancecanbeproducedbythismouldstructureandformingtechnology. Keywords: profilemodifiedgear; warmforging; numericalanalysis; FEM1 Introduction motorcycle gear transmission gear is an important part, the ends of the rectangle with a combination of three or four teeth, such as the use of conventional machining,abercrombie, the manufacturing costs are high, difficult to form mass production. With the rapid development of China's motorcycle industry, the milling process can not meet the needs of development. Use precision forging technology, so that both ends of the tooth surface is difficult to process a combination of direct forging,abercrombie amsterdam, no machining, can enhance the processing efficiency of products, and because the forging forging tooth there is fibrous tissue, so that the strength of gear tooth gear with a greater degree of improvement, which has been extended life. Motorcycle gear blank forging methods including flying side open * Chongqing Natural Science Foundation (CSTC2005BB3080) ** Female, 33 years old, Master, lecturer Received date :2006-12-24; revision date: 2007 -03-30 forging and did not flash the closed die forging, open die forging cutting not be too accurate, with the length of the tooth can be controlled,Hollister wien, but the mold with the bridge department and severe tooth root cracking and wear, and teeth filled with blanks is not easy. At the same time increase due to flash trimming process, reduce material utilization, increase the cost of gear blank forging. Closed forging material utilization is high, easy to control key tooth length, but cutting requires accurate, poor mold repair, mold life is low, so that the mold manufacturing costs. For the current problems that exist, need to find excellent productivity,Abercrombie nederland, high material utilization, production and processing of low-cost mold manufacturing method or mold design technology program. 2 gear gear products shown in Figure 1,abercrombie. The outer surface of the product is involute, the hole is the spline teeth, respectively,hollister, at both ends with four claw-shaped teeth. Material 20CrMoTi. Gear technology parameters: modulus a 1.75, the pressure angle a-20. , Number of teeth a 20. Gear of the technical requirements: ① overall [2] Zhao Zhen, Xie Xiaolong, Gu Sheng-Guang, et al. Fine-blanking process of large deformation elastic-plastic finite element analysis [J]. Forging & Stamping Technology, 2005,40 (5) :47-49. [3] Wen Tong, Liaolin Can, ZHANG Xiang-wei. Theoretical study of metal cutting conditions [J]. Forging Technology, 2000,25 (3) :44-47. [4] Xu Bing industry,hollister ireland, Liu letter sound. Application of elastic-plastic mechanics [M]. Beijing: Tsinghua University Press, 1995. [5] Zhao Zhen,hollister scs, Xie Xiaolong, Gu Sheng-Guang,hollister, et al. AISI 1035 steel, a fine blanking and forming the numerical simulation of fracture [J]. Mold Industry,hollister, 2005,31 (7) 13-16. [6] Xie with the good, Shengwei, tour celebration. Metal forming process of computer simulation [J]. Forging Machinery, 1997,32 (4) :45-48. Topics related articles:        相关的主题文章： 1347-1349. Wangxiong Yao precision forging technology abercrombie amsterdam

three-dimensional rigid-plastic finite element method, boundary conditions of friction approach key words meet bi rub method, just type of hoe Keywords plastic mattress board, sex, I. Introduction cut plastic finite element method has been widely used in plastic deformation process and has made very good results. Currently, the rigid-plastic finite element method and application of research by the two-dimensional problem is gradually promoting the three-dimensional problem. This article describes the three-dimensional rigid-plastic finite element method in the treatment of friction boundary conditions,abercrombie amsterdam, gives the corresponding formulas. Second,Hollister wien, the mathematical model of boundary friction rigid-plastic finite element analysis of the most commonly used friction model was developed by Chen and Kobayashi's first proper arc tangent function model,hollister scs. ,hollister ireland, That: =-- mK called ¨ (v) where m - friction factor K - shear yield strength - the workpiece relative to the sliding speed of the mold - mold faster than several orders of magnitude smaller constant, it is desirable that the model 1o In consideration of the relative sliding velocity on friction effects, more realistic,hollister, but also a good deal with the neutral point speed Received Date 1996-03-16 deformation conditions, to ensure the convergence of iterative calculation. Third, the method and formula 1. According to the basic equation of Markov variational principle,abercrombie, to meet the deformed geometry, boundary conditions and incompressible volume displacement rate of all permit conditions,abercrombie, the velocity field, so that functional r. rJi a J ~ T, V, dS (2) take the absolute minimum value of the velocity field of the real velocity field. The first is the functional loss of the power of plastic deformation, the second is the power by force,hollister. If only consider the friction force, and noted the friction and the sliding speed is always in the opposite direction and functional items for the power, there are:-D + (3) Ji DJi such as (4) a call m] s (5) where the fine moving velocity vector of vector mode. After discretization, the functional extremum into the multi-node variable speed function extremum: 47 a o (v) (6) non-linear equations,hollister, using NewtonRaphson method to solve: Lov,hollister scs, ov: J_,hollister. 1] a (iv)-LVrJJVz) = VJ (]) + flz ~ V1 () (8) Lu said the slowdown factor, O

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