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Research on the Torsional Deformation of a Crankshaft’s Compound Follow-up Turning

Author: ChenKen
Tutor: HuangJiXiong
School: Wuhan University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Crankshaft machining The phase angle of the rod neck Deform Processing accuracy
CLC: TG51
Type: Master's thesis
Year: 2011
Downloads: 50
Quote: 0
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Abstract


The crankshaft is one of the important parts of the engine, it will engine reciprocation of the piston into the rotary motion of the crankshaft of the engine. In this part of the machining of the crankshaft, the crankpin processing is a difficult, and this is because the axis of the rod neck is eccentric relative to the axis of the spindle neck. Domestic crankshaft production rely mainly on general machine tools and special machine tools, production efficiency and a low degree of automation. Crankshaft machining mainly rely on expensive imported equipment, the cost of the crankshaft and thus greatly improved. Designed for this problem, a new Crankshaft machining lathe, ie crankshaft composite lathe. Still the main journal centerline of the crankshaft composite the lathe processing Crankpin when the rotation center, a fixture can complete all journal roughing. The crankshaft is a high precision parts, it requires high machining accuracy for complex lathe. Composite turning conditions Crankshaft phase accuracy as the object of study, a more in-depth study on the accuracy of the Crankshaft Turning. This article reads as follows: 1, a brief introduction of the principle of the crankshaft composite turning process, the factors that affect the cutting force in the composite turning process parameters and empirical formula to calculate the size of the cutting force. And crankshaft in the mechanical characteristics of the composite turning calculate the variation caused by the torque of the crankshaft torsional deformation in the cutting process; 2, demonstrated the need to improve the machining accuracy by error compensation, and pointed out the error compensation to clear the error variation as a precondition. Processing error sources from the two aspects of composite lathe the process systematic errors and error of the workpiece from the crankshaft. And a detailed analysis of the crankshaft in the presence of the phase error of the relative phase angle error, bringing the rod neck. Ultimately determine the main factors of the influence of the phase error of the rod neck, i.e. the clamping crankshaft relative phase angle error and the crank in the cutting force under deformation; 3, proposed a model for the study of the crankshaft in the composite turning, in the framework of this model. analysis of the variation of the cutting force using the finite element software to calculate the the crankshaft stiffness coefficient calculated by the force and stiffness crankshaft deformation, thereafter proposed the torsional deformation Crankshaft variation of the phase error and the existence of the crankshaft rod neck roundness error variation; argument experimental study crankshaft composite lathe to the necessity of the application. Torsional deformation characteristics and the structural features of the test bench of the crankshaft composite turning the crank in the processing system devised a set of dynamic measurement of the crankshaft in the process phase of deformation of the rod neck. Thesis the contents of the car the crankshaft manufacturing has practical value, and has broad application prospects.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Turning and lathe ( lathe )
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