Turn 8A Bogie Side Frames and yoke fatigue crack a

xp574088 · Wysłany: Czw 10:54, 31 Mar 2011

Turn 8A Bogie Side Frames and yoke fatigue crack analysis

More defects such as slag. In the use of these factors will be the fatigue crack source. (3) in the side frame finished Buxiu or repair process at all levels, can not strictly enforce the repair welding process, such as welding repair of body side frame when the cuts, the elimination of welding defects in the former can not repair the residual sand, normalizing after welding repair treatment process is not strictly so, resulting in reduced performance welding repair parts or new source of stress concentration and become the crack 3. Improvements (1) improve the casting process and improve the quality of side frame casting. (2) attention to the side frame casting heat treatment process, strict compliance with inspection, welding repair. . . ','. ''. '. ''. ''. ''. . '. . . '. ''. . ,, '. '. ''. '. '. . . . ','. 'Finally, respectively, over F point and graphics (3) any reverse pressure center point of the role of C / / CG, the interception of friends = 3, CG = L. +2, CF in connection GH cross, point, then, the pressure point is the center of the workpiece. J. L2. b. 1II) Hang) Figure 5 (Author: Huainan Mining Group Wangfenggang Machinery Factory) Editor: Chen Tai Shunchang paragraph 2 ∞ 5 No. 9 45. D Art procedures such as _T, improve product quality side frame. f3) redesigned side frames. Side frame of the new design for the switch to the new 8G model replace new office bogies and repair the original side of the frame transfer type 8A. New side frame on the basis of maintaining interchangeability. The A, B District, Yuen bar, C District, corners and other parts of the spring bearing the audience with a more reasonable cross-section structure, and the guide hooks outside the box to box by the I-section, etc. Second, l3 yoke No. Fatigue crack analysis 1. Fatigue Cracking in the number of distribution sites and after speed. Coupler device number of Fatigue Cracking in a significant increase (Table 2). Table 3 lists the 2002 l ~ 9 month of a depot repair process in the statistics section of yoke position and the number of crack distribution: Table 4 shows the yoke in the Overhaul Maintenance of Statistics (2002, repair time 3 to 6 months). Table 2 Revised statistics before and after speed yoke pieces of crack on the crack on corner crack Knuckle cracking Knuckle Knuckle other crack plane total quantity (pieces) ratio (%) Number (pieces) ratio (%) Number (pieces) ratio (%) 4723878258l2276 Table 3 and Table 4 shows that after the yoke speed corner crack serious, not only made of ZG230-450 of the yoke have this problem, C-class steel yoke does not resolve this problem. . 2. Analysis of Fatigue Cracking (1) finite element calculations show that the original structure, large parts of yoke corner stress zone as a whole is close to 200MPa, where the maximum stress as high as 276MPa, far more than ZG230 - 450, and C grade steel Xu with stress (123MPa and 195MPa), therefore, 2 yoke of materials can not meet the static strength design. Table 4 yoke statistics Overhaul Technology Malisan material in coal Malisan material is a two component resin and catalyst from the composition of Poly plastic resin material. Products can withstand the pressure of more than 10MPa. Besides, we have some flexibility. First, the performance and parameters Malisan Malisan performance parameters of the basic components of Table 1,[link widoczny dla zalogowanych], Mary gathers performance parameters in Table 2. Table 1 Malisan performance parameters of the basic components of the basic components of resin catalyst 25 ~ C ~ density (g/cm3) 1,041.2325 ℃ the viscosity (MPa · s1200210 mixing ratio (by volume) 1120 ~ C when the storage period (days) 180 180 Storage suitable temperature (℃) 5 ~ 305 ~ 30}} (2) speed, the inertial force increases while the vehicle; the other hand, performance of different brake, the train's braking effect is poor at the same time, causing the vehicle longitudinal impulse increased, the buffer device to withstand the longitudinal forces increase. (31 casting defects. yoke corner site has pores, trachoma and other casting defects, leading to crack initiation life is too short, or even initiation life, greatly shortening the service life. ( 4) explore the phenomenon of leakage exists in maintenance, resulting in individual yoke with crack use, or the crack is not in strict accordance with the provisions of welding repair process operation, which weakened the position of strength. 3. improvements 462oo5 No. 9 (1) the use of The new structure has been developed yoke. yoke made of the new C-class steel, finite element calculations show that, although its rear corner area is still large stress region, but the maximum stress has been reduced to 170MPa. less than the C-level allowable stress of steel (195MPa). its fatigue life analysis showed that the fatigue life than the original structure (C grade steel) increased by 7 times. (2) to enhance testing and inspection to ensure product quality yoke. (3) strictly maintenance process of order, to improve the quality of maintenance. f Author: Rail transport companies of Huainan Mining Group 1 Editor: Duan Shun Chen Tai