Control method of rail wagon wheelset press fitting force
A technology of railway wagons and control methods, which is applied in the control of workpiece feed movement, manufacturing tools, and grinding machine parts, etc., which can solve the problems of unqualified press-fitting curves and small press-fitting tons, and improve the quality of press-fitting rate effect
Active Publication Date: 2015-04-22
CRRC YANGTZE CO LTD
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However, when the parameters such as press-fit interference, cylindricity, and roughness meet the technical requirements, there will still be unqualified press-fit curves, and the reason for the unqualified press-fit is mostly due to the small ton of press-fit
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[0023] The inventor found through long-term observation that the residual stress on the surface of the axle is one of the important factors affecting the press-fitting curve of the wheel set. Based on the study of the relationship between the residual stress on the axle surface and the press-fitting force of the wheel set, as figure 1 As shown, the inventor proposed through theoretical analysis that the residual stress on the surface of the axle and the press-fit force of the wheel set have a linear relationship within a certain range (that is, when the force on the press-fit surface of the axle does not exceed the yield strength of the material), that is: During the process, the size of the press-fitting force is the combined effect of friction and surface residual stress, that is, F=f+kσ L , where F is the press-fitting force during the wheel-set press-fitting process, f is the friction force, σ L is the component force of the axle surface residual stress in the pressing di...
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The invention discloses a control method of rail wagon wheelset press fitting force. The method comprises a step of determining component force sigma L of a car axle surface residual stress on press fitting direction according to a formula F= f+ k sigma L, wherein the component force sigma L of the car axle surface residual stress on the press fitting direction corresponds to wheelset press fitting force F, a step of calculating longitudinal load X1 corresponding to the component force sigma L according to relation between car axle grinding surface layer residual stress sigma L and grinding use level, namely sigma L= -148.8+ 17.8*X1+ 70.0*X2+ 7.2*X3+ 26.7*X1*X2+ 23.1*X1*X3- 28.9*X2*X3+ 58.6*X1*X1- 44.3*X2*X2+1.6*X3*X3. According to the control method of the rail wagon wheelset press fitting force, effects on wheelset press fitting curve yield by the car axle surface residual stress are analyzed according to a production mechanism of the car axle residual stress and stress state of the residual stress in the process of wheelset press fitting. Negative effects on press fitting by the car axle surface residual stress are adapted and overcome by controlling of car axle machining longitudinal load parameter f a, and wheelset press fitting yield is improved.
Description
technical field [0001] The invention belongs to the technical field of railway freight wheel assembly, and in particular relates to a method for controlling the pressing force of a railway freight wheel pair. Background technique [0002] At present, the wheel set press-fitting in domestic railway wagon repair factories basically adopts the base shaft system processing and matching assembly process. influences. However, when parameters such as press-fit interference, cylindricity, and roughness meet the technical requirements, there will still be unqualified press-fit curves, and the reason for the unqualified press-fit is mostly the small press-fit tonnage. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for controlling the press-fitting force of railway freight wheel pairs, so as to improve the press-fit pass rate of railway freight wheel pairs. [0004] In order to solve the above-mentioned technica...
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IPC IPC(8): B24B49/16
CPCB23P19/021
Inventor 苗培实胡宏伟江锐锋左云清武永亮
Owner CRRC YANGTZE CO LTD