带式输送机外文翻译

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1、中国矿业大学毕业设计附录：外文资料与中文翻译外文资料：STUDY ON BOUNDARY NOTCH OF CEMENTECARBIDE CUTTING TOOL1 INTRODUCTIONThe wear and boundary notch of cemented carbide cutting tools are often found in the machining. They directly influence machining quality of the machined workpiece and the cutting performance and life of t

2、he cutter. Especially, in the precision machining, flexible manufacturing system (FMS) and other automation manufacture, wear and boundary notch behaviors of cemented carbide tools are even more important. Metal cutting experiences have expounded that wear and boundary notch of the cemented carbide

3、cutting tools are more serious in the machining of the workpiece in which the strain hardening is high and the remaining is not even. It seriously influences the machining quality of the machined piece and the cutting performance and life of the cutter. But, so far, there has not been much research

4、on the boundary notch mechanism of cemented carbide cutting cutter, and the technical measures to reduce boundary notch of cemented carbide cutting tools are fewer1,2. So that, the based on the machining experiments of friction welded joint, this research focuses on the forming processes and main ru

5、les of the boundary notch, and has developed several measures to resist or lessen boundary notch, which provides a theoretical and experimental base to ensure cutting performances of cutters and machining quality.2 THE FORMING PROCESS AND MAIN SIZE OF BOUNDARY NOTCHThe boundary notch of cemented car

6、bide cutting tools is a wear area, which is relatively large, resulting from friction between main cutting edge and the surface of the workpiece as the following Fig.1. Fig.1 (a) shows a traditional wearing type of the flank. The rake face Ar and flank face Aa are also shown. Fig.1 (b) shows the mai

7、n dimension of boundary notch of the lathe tool, in which VN represented the height of boundary notch and C refers to the width. It is apparent that the greater the dimensions of VN and C are, the greater it destroys the performance of tools and influences the machining quality3,4.By experiment, the

8、 forming process of the boundary notch can be divided into the following three steps: firstly, several micro cracks are produced at main cutting edge. Secondly, the mesh fractures are found in the boundary areas and they will spread. Finally, the piece material will be denuded and the boundary notch

9、 is formed. In the subsequent cutting process, the dimension of the boundary becomes bigger and bigger.Fig. 2 shows the forming process of boundary notch of the cemented carbide cutting tools.Main factors to influence boundary notch are mechanical performance of the piece material, the cutter materi

10、al, and geometry parameter of the cutter. The following experiments were carried out in order to expound the forming mechanism and evolution rules of the boundary notch.Fig. 1 Boundary notch of the cemented carbide cutting tool in turningFig.2 Forming process of boundary notch of the cemented carbid

11、e cutting tools.3 EXPERIMENT CONDITIONS AND TESTING MEASURESThe lathe C6130 and reversible cutting tool are used in the experiment. Five cutter materials are employed. Main mechanical parameters of cutter material are shown in Table 1.The machining piece is the friction-welded line of the single hyd