遼字石油化工大學⊙ Among all the factors mentioned above, the most important factors for the cutting process are the following three 1.The cutting speed, V, is the speed with which the cutting tool moves through the work material. This is generally expressed in metres per second(ms-1) 2. Feed rate, f, may be defined as the small relative movement per cycle(per revolution or per stroke)of the cutting tool in a direction usually normal to the cutting speed direction 3. Depth of cut, d, is the normal distance between the unmachined surface and the machined surface
Among all the factors mentioned above, the most important factors for the cutting process are the following three: 1.The cutting speed, V, is the speed with which the cutting tool moves through the work material. This is generally expressed in metres per second (ms-l). 2.Feed rate, f, may be defined as the small relative movement per cycle (per revolution or per stroke) of the cutting tool in a direction usually normal to the cutting speed direction 3.Depth of cut, d, is the normal distance between the unmachined surface and the machined surface
遼字石油化工大學⊙ Eg: In the turning processes, illustrated in greater detail in Fig followed, the cutting tool is set at a certain depth of cut (mm) and travles to the left with a certain velocity as the workpiece rotates. The feed, or feed rate, is the distance the tool travles horizontally per unit revolution of the workpiece(mm/rev). This movement of the tool produces a chip, which moves up the face of the tool Feed Depth of cut (mm/rev) (mm) Chip Tool
Eg:In the turning processes,illustrated in greater detail in Fig.followed,the cutting tool is set at a certain depth of cut (mm) and travles to the left with a certain velocity as the workpiece rotates.The feed,or feed rate,is the distance the tool travles horizontally per unit revolution of the workpiece(mm/rev).This movement of the tool produces a chip,which moves up the face of the tool
遼字石油化工大學⊙ C Categories of cutting tools Cutting tools are classified in different ways 1. According to the processing mode, divided into turning tool, hole processing tool, milling cutter, broach, thread tool, gear tool, and CNc machine tool etc.(used widely) 2. According to the materials, tools can also be classified high-speed steel tools, carbide tools, ceramic tools, cubic boron nitride(CBn)tools and diamond tools 3. According to the structure, it is divided into integral cutting tool, inserted cutting tool and compound cutting tool 4. According to the standardization, it is divided into standard tools and non -standard tools
C. Categories of cutting tools Cutting tools are classified in different ways: 1.According to the processing mode , divided into turning tool, hole processing tool, milling cutter, broach, thread tool, gear tool, and CNC machine tool etc.（used widely） 2.According to the materials,tools can also be classified high-speed steel tools, carbide tools, ceramic tools, cubic boron nitride (CBN) tools and diamond tools. 3.According to the structure, it is divided into integral cutting tool, inserted cutting tool and compound cutting tool. 4.According to the standardization,it is divided into standard tools and non-standard tools
遼字石油化工大學⊙ D Cutting- Tools Materials The selection of cutting-tool materials for a particular application is among the most important factors in machining operations, just as the selection of mold and die materials was critical for forming and shaping process. We will discuss the relevant properties and performance characteristics of all major types of cutting-tool materials, which will help us in tool selection As noted before, the cutting tool is subjected to (a). High temperatures (b). High contact stresses; (c). Rubbing along the tool-chip interface and along the machined surface
D.Cutting-Tools Materials The selection of cutting-tool materials for a particular application is among the most important factors in machining operations, just as the selection of mold and die materials was critical for forming and shaping process. We will discuss the relevant properties and performance characteristics of all major types of cutting-tool materials, which will help us in tool selection. As noted before, the cutting tool is subjected to: (a). High temperatures; (b). High contact stresses; (c). Rubbing along the tool-chip interface and along the machined surface
遼字石油化工大學⊙ Consequently, the cutting-tool material must possess the following 950 70 characteristics: Hot hardness: This 工 property ensures that the 75 tool does not undergo any plastic deformation and thus retains its shape 6050505050 and sharpness. Tool material hardness as a 605 function of temperature is 300 500 700 shown in right Fig Temperature(C)
Consequently, the cutting-tool material must possess the following characteristics: Hot hardness: This property ensures that the tool does not undergo any plastic deformation and thus retains its shape and sharpness. Toolmaterial hardness as a function of temperature is shown in right Fig