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1、制造技术基础复习基本概念、基本原理英语表达参考 Review the Basic Concepts and Principles of Fundamentals of Manufacturing Technology in EnglishCHAPTER ONE DESIGN FOR MECHANICAL PROCESS PLANNING Section 1 Basic conceptsProduction procedure of mechanical productsProcess procedure of machiningElements of Process procedure of
2、machining1 sequence 工序；2 installation 安装；3 station 工位；4 step 工步； 5 pass 走刀Sequence: process procedure that consists of several sequences during which workers operate on the works continuously in the same place;(操作者、加工地、工作对象 人为划分，相对可变)Installation: in a sequence if the work is required to put into po
3、sition and clamp several times,the part of sequence done in one positioning and clamping is called an installation;(确定）Station: In an installation, by using the indexing or moving device the work is changed its position relatively to the cutting tool. All the tasks done for the work in one machining
4、 position in an installation is termed as the station;(确定）Step：In one station if the surface cut, cutting tool, velocity, and feed remain unchanged, these working contents are thought of as the step.(加工表面、刀具、切 削速度、进给量任一改变均为另一工步）Pass: When the surface of the work is cut for any one time ,such task ca
5、rried out is named as the pass(刀具在加工表面的每一次切削）Processing system: a system that contains the work to be machined, fixture that holds the work in the proper position, cutting tool that machines the work directly, and machine tool that gives the power and provide the movements to accomplish the processi
6、ng. In recent years the gauging and measuring is added to the system. Relationship between the batch and the pattern of productionN-program of production, Q-annual turnout of the product n-number of the components a year,-share rate, -waste rate, F -annual working days, A- number of days for invento
7、ry, -number of components in a lot(1%)N =QnbN Fn =AA Program of productionIn a period of planning, the turnout of product and schedule to be fulfilled is called program.(计划期的产量加进度=生产纲领） The turnout in one year planning is named the annual program . B Batch of productionAt a time, the number of ident
8、ical products to be put into production or to be producedis termed as batch of production. (一次投入生产的同一产品的数量=生产批量） Process planning for machining operations : stipulated document for technological process (机械加工工艺规程：以工艺文件形式规定的机 械加工工艺过程) Patterns of the process planning for machining Generally speaking,
9、 the process planning for machining appears in the form of sheet or card with the same basic content in three patterns: Pattern A: sheet of process procedures(工艺过程卡), a very simple and concise document, usually for single/small batch production Pattern B: sheet of process operation (机械加工工艺卡), often
10、for batch production Pattern C: sheet of process sequence (机械加工工序卡), with detailed and complete contents, frequently for massive productionSection 2 Location and Datum of the work in machining Installation and clamping(装夹）: concerning about the ways in which the work is installed and clamped in the
11、fixture or on the machine tool, including two aspects, locating(定位定位) and clamping(夹紧夹紧). Locating: the procedure during which the work gains its proper position in the fixture or on the machine tool. Clamping: when the workpiece has gained its correct position in the fixture, it will be subject to
12、the external forces while being machined. So, to hold or keep the workpiece in the correct position is definitely required, which is called clamping. Six-Point Locating Principles：A cuboid is in cartesian coordinate with six degrees of freedom The six degrees of freedom are three linear movements al
13、ong the three coordinate axes, respectively, and three rotations around these coordinate axes In theory, the locating point is the geometric point; in reality, it is something different with its three dimensions（尺寸，维度）. The following are commonly used in workshops. Button locator(支撑钉);Plug(档销); Supp
14、orting plate（支撑板）; Pin/pin locator （长销） Button; Cut pin/rhombus pin（削边销/菱形销）; Mandrel（心轴）; V block（形块） Short V block （短形块）; Positioning sleeve（定位套）; Fixed/floating conic pin（固定/浮 动锥销）; Center(顶尖（固定/浮动）) Complete positioning :locating with constraint（约束） for all six degrees of freedom. Incomplete pos
15、itioning: locating with constraint for less than six degrees of freedom. Under/over-positioning: the number of constraints of degree of freedom is less than that required. Under-positioning ought to be avoided and, Over-positioning: the same degree of freedom is constrained by two or even more const
16、raining points, such situation is called over positioning, which will be allowed occasionally. Datum(基准基准) is the point, line or surface based on which the geometric relation-ships among elements of the object to be worked at are determined. The concept is so important that is may be used for any aspect of production, from design, through manufacturing including sequences of X,Y,and Zttt) )X, Y, and Zrrroperation, to
