SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING UNrSⅨX MANUFACTURING PROCESSES process过程 LESSON ONE MACHINING PROCESSES 工艺规程方法 In a sense The manufacturing (or production) process 从某种意义上说 of a factory in a broad sense, is the sum total of sum total总数 separate processes involved in the conversion of raw materials or semi-finished products into final as far as至于 products. As far as a factory is concerned,its‖bank空白的 products can be blanks, finished parts 毛坯,坯件 mec hanisms, units or end products. The raw‖lpat部分,零件 materials or semi-finished products used for mechanism manufacturing the products are often produced‖机构,机理 and supplied by other factories. Sometimes theunit单位,部件 products of the factory need to be further processed by other factories before they become the end products
SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING UNIT SIX MANUFACTURING PROCESSES LESSON ONE MACHINING PROCESSES process 过程 工艺规程,方法 The manufacturing (or production) process of a factory, in a broad sense, is the sum total of separate processes involved in the conversion of raw materials or semi-finished products into final products. As far as a factory is concerned, its products can be blanks, fi ni shed parts, mechanisms, units or end products. The raw materials or semi-finished products used for manufacturing the products are often produced and supplied by other factories. Sometimes the products of the factory need to be further processed by other factories before they become the end products. in a sense 从某种意义上说 sum total 总数 as far as 至于 blank 空白的 毛坯，坯件 part 部分，零件 mechanism 机构，机理 unit 单位，部件
SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING The manufacturing (production) process cost accounting includes not only processes acting directly upon 成本会计, the manufactured objects, but also preparatory成本核算 processes(such as production planning, process planning, production scheduling, tooling preparation, etc and auxiliary processes(such as equipment maintenance, inter-shop material and workpiece handling, cutting tool sharpening narrow sense quality inspection,, production statistics, cost‖狭义 accounting, etc.) The processes, acting directly upon the manufactured objects, change the shape, dimensions and properties of raw materials or semi-finished products, or assemble parts into final products. These processes are manufacturing (or production) processes in a narrow sense
SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING The manufacturing (production) process includes not only processes acting directly upon the manufactured objects, but also preparatory processes (such as production planning, process planning, production scheduling, tooling preparation, etc.) and auxiliary processes (such as equipment maintenance, inter-shop material and workpiece handling, cutting tool sharpening, quality inspection, production statistics, cost accounting, etc.) The processes, acting directly upon the manufactured objects, change the shape, dimensions and properties of raw materials or semi-finished products, or assemble parts into final products. These processes are manufacturing (or production) processes in a narrow sense. cost accounting 成本会计， 成本核算 narrow sense 狭义
SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING There are various manufacturing processes casting铸造 used for converting raw materials into finishedforging f#xit parts. These processes include casting, forging, welding Htk welding, punching, forming, machining, heat- punching it. treatment, plating, coating, and so on. Among forming成形加工 them, the machining process plays an machining切削加工 important role in the manufacture of parts heat- treatment热处理 The machining process of a part may plating电镀 include various machining operations, such as coating i a turning, milling, drilling, grinding, broaching operation操作,工序 gear-cutting, etc. depending on the required turning车削 shape, dimensions, accuracy and surface milling铣肖 quality of the part. In order to ensure the drilling fijl quality of a completed part. well-planned grinding磨削 processes documents are necessary broaching拉削 etc.= et cetera
SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING There are various manufacturing processes used for converting raw materials into finished parts. These processes include casting, forging, welding, punching, forming, machining, heattreatment, plating, coating, and so on. Among them, the machining process plays an important role in the manufacture of parts. The machining process of a part may include various machining operations, such as turning, milling, drilling, grinding, broaching, gear-cutting, etc. depending on the required shape, dimensions, accuracy and surface quality of the part. In order to ensure the quality of a completed part, well-planned processes documents are necessary. casting 铸造 forging 锻造 welding 焊接 punching 冲压 forming 成形加工 heat-treatment热处理 machining 切削加工 plating 电镀 coating 油漆 operation 操作,工序 turning 车削 milling 铣削 drilling 钻削 grinding 磨削 broaching 拉削 etc.= et cetera
SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING After a new product is designed planning the processes for its component parts is the first step of the preparatory work for manufacturing. The planned process documents serve as the basis and initial data for all other preparatory work, and the rules and regulations for production operations, the quality of process plans influences directly the degree of complexity of the preparatory work for manufacturing, the time length of the preparatory stage, the quality of parts and products manufactured, the degree of complexity of production scheduling and operations sequencing, the makespan of parts and products, and the production costs Hence process planning is of key importance to manufacturing 制造时间
SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING After a new product is designed, planning the processes for its component parts is the first step of the preparatory work for manufacturing. The planned process documents serve as the basis and initial data for all other preparatory work, and the rules and regulations for production operations, the quality of process plans influences directly the degree of complexity of the preparatory work for manufacturing, the time length of the preparatory stage, the quality of parts and products manufactured, the degree of complexity of production scheduling and operations sequencing, the makespan of parts and products, and the production costs. Hence process planning is of key importance to manufacturing. 制造时间
SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Often there exist alternatives of process plans for manufacturing a part. The quality of a process plan should be evaluated from a technological as well as an economical standpoint. A good process plan not only ensures the required quality of manufactured parts, but also reduces the production cost. In process planning, a comprehensive analysis of part structure, material and technical specifications, production volume and manufacturing conditions must be made, so as to properly make all the decisions related to the planning of the process Many decisions should be made in machining process planning Selection of the blank and its manufacturing method Selection of machining methods for part sur faces Determination of operations sequence Determination of workpiece setting method for each operation
SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Often there exist alternatives of process plans for manufacturing a part. The quality of a process plan should be evaluated from a technological as well as an economical standpoint. A good process plan not only ensures the required quality of manufactured parts, but also reduces the production cost. In process planning, a comprehensive analysis of part structure, material and technical specifications, production volume and manufacturing conditions must be made, so as to properly make all the decisions related to the planning of the process. ﹡Many decisions should be made in machining process planning. ﹡Selection of the blank and its manufacturing method. ﹡Selection of machining methods for part surfaces. ﹡Determination of operations sequence. ﹡Determination of workpiece setting method for each operation