Selecting a cutting Conditions determines the depth of cut, number of feeds, feed amount, cutting speed and power required under certain machining conditions. Reasonable cutting conditions is the cutting mode that takes the least time to make the product, so it is the cheapest. If the correct tool construction, cutting geometry parameters, materials, ironing and polishing methods are selected, as well as the correct setting, clamping of the tool and workpiece, good machine adjustment and structural technology reasonable will create conditions to choose a reasonable and beneficial regime.
BỘ GIÁO DỤC VÀ ĐÀO TẠO TRƯỜNG ĐẠI HỌC SƯ PHẠM KĨ THUẬT TP HỒ CHÍ MINH . MACHINE MANUFACTURING TECHNOLOGY FUNDAMENTALS OF MACHINE MANUFACTURING TECHNOLOGY Final Report *** PROBLEM 1: HOW CAN YOU SELECT THE OPTIONAL CUTTING CONDITIONS? PROBLEM 2: A STUDY ON THE GEOMETRY OF SINGLE – POINT CUTTING TOOL? PROBLEM 3: INTRODUCTION TO THE LATHE MACHINE? CLASS CODE: FMMT330825E_21_2_02CLC INSTRUCTORS: TRUONG NGUYEN LUAN VU PERFORM: NGUYEN DUC NAM SEMESTER: – YEAR: 2021 – 2022 Tp Thủ Đức, tháng 6, năm 2022 * Ghi chú: - Người làm: Nguyễn Đức Nam SĐT: 0969937878 - MSSV: 20143224 Điểm số: Nhận xét giáo viên: TP Thủ Đức, ngày 12 tháng 10 năm 2022 Ký xác nhận giảng viên Table of Contents List of Figures .1 Abstract Research Methodology PROBLEM 1: How conditions ? can you select the optional cutting Cutting Conditions Selection of Conditions Cutting Selecting depth of cup Selecting feed Optimizing cutting speed PROBLEM 2: A study on the geometry of single - point cutting tool ? Cutting Tool Geometries Single Point Cutting Tool Definition .9 Single Point Cutting Geometry 10 Tool PROBLEM 3: Introduction to the lathe machine ? 17 Introduction 17 …………………………………………………………………… Lathe Machine Definition …………………………………………………… 17 Parts of the Lathe Machine and their Functions ……………………………… 19 Work is held in the lathe with a number of methods ………………………… 23 Turning tapers on Engine lathes ……………………………………………… 24 Turret lathes …………………………………………………………………… 25 Single - spindle and Multi - spindle bar machines …………………………… 26 Computer - controlled lathes (CNC lathes) …………………………………… 28 Conclusion …………………………………………………………………… 30 References 31 …………………………………………………………………… List of Figures Figure 1: To machine a large surface, the tool must be given a feed…………… Figure 2: Depth of cup and deep………………………………………………….5 Figure 3: Cutting speed………………………………………………………… Figure 4: Example of selection of roughing passes in a turning operation……… Figure 5: Finishing pass in a turning operation………………………………… Figure 6: Total cost per part and total time per part versus cutting speed…………8 Figure 7: Cutting edges, surface and angles on the cutting part of a turning tool…9 Figure 8: Tool geometry of a single point cutting tool………………………… 10 Figure 9: Single – point Cutting Tool Geometry……………………………… 11 Figure 10: Positive rake angle………………………………………………… 12 Figure 11: Negative rake angle………………………………………………….13 Figure 12: The principal components of an engine lathe……………………….19 Figure 13: Four work holding methods used in lathes………………………… 24 Figure 14: Three methods for turning tapers on an engine lathe……………….25 Figure 15: Picture about turret lathes………………………………………… 25 Figure 16: Single-spindle and multi-spindle bar machines…………………… 26 Figure 17: A close-up view of a single spindle bar machine Typical parts produced on a single spindle bar machine……………27 Figure 18: The principle components of a six-spindle bar machine CNC controlled multiple-spindle bar machine……………………… 27 Figure 19: Computer-controlled lathes…………… ………………………… 28 Figure 20: CNC lathes………………………………………………………… 29 Abstract To test our understanding of the basic subject of machine building technology of Ho Chi Minh City University of Technology and Education, we need to a final report The instructor gave us main problems to solve: the cutting conditions, single - point cutting tool and the lathe Below is the content to solve the above problems; Includes: definitions, images and machining calculation formulas In addition, this final report will be evaluated and corrected Research Methodology State the concept of definition, analyze and evaluate, compare and contrast Using data collection and data analysis methods, look for illustrations to make the essay more coherent and easy to understand PROBLEM 1: HOW CAN YOU SELECT THE OPTIONAL CUTTING CONDITIONS Cutting Conditions Selecting a cutting Conditions determines the depth of cut, number of feeds, feed amount, cutting speed and power required under certain machining conditions Reasonable cutting conditions is the cutting mode that takes the least time to make the product, so it is the cheapest If the correct tool construction, cutting geometry parameters, materials, ironing and polishing methods are selected, as well as the correct setting, clamping of the tool and workpiece, good machine adjustment and structural technology reasonable will create conditions to choose a reasonable and beneficial regime The cutting conditions is affected by a variety of factors such as the chemical composition of the material, the manufacturing method of heat processing, the microstructure, the grain size, and the crystal lattice The above factors often influence each other on the cutting mode and cannot be evaluated independently and separately The cutting conditions also depends on the machining method, the type of tool material, the geometrical parameters of the cutting tool, the mounting conditions, and the clamping of the part, so the cutting mode is very complicated, often chosen according to experience and use Use empirical formulas to calculate the cutting mode Each machining operation is characterized by cutting conditions, which comprises a set of three elements: - Cutting velocity V: the traveling velocity of the tool relative to the workpiece It is measured in m/s or m/min - Depth of cup d: the axial projection of the length of the active cutting tool edge, measured in mm in orthogonal cutting it is equal to the actual width of cut bD - Feed f : the ralative movement of the tool in order to process the entire surface of the workpiece In orthogonal cutting it is equal to the thickness of cut h D and is measured in mm t r −1 in turning, or mm/min in milling and drilling Figure 1: To machine a large surface, the tool must be given a feed (Left) In orthogonal cutting, feed f and depth of cut coincide with the thickness of cut h D and width of cut b D, respectively (Right) In oblique cutting, the cutting tool edge is set at an angle ( tool cutting edge angle ) for easier chip removal Selection of Cutting Conditions For each machining operation, a proper set of cutting conditions must be selected during the process planning Decision must be made about all three elements of cutting conditions: - Depth of cut: decided by machining, allowance and shape of the work piece, power and rigidity of the machine and tool rigidity The depth of cut is usually expressed in half stock removal and will never be larger than the main cutting edge length of the insert - Feed: For the tool holder, “feed rate” is the amount of movement of the tool holder in one rotation of the work For the cutter, “feed rate” is expressed by the value founded by dividing the amount of movement of the machine table in one rotation of the cutter by the number of teeth (feed per tooth) Lowering “feed