初中道德与法治九年级下册第三课练习题-普通用卷.docx
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1、e weight (kg) all Page No. cod e dimensionNetweightpages per for ma nce Partsquantityinaproduct Quan tity ina batch ope rati on Fi xt uri ng Op era tio n ste p Th e co nte nt of op era tio n Numberofpartsinonesetup Nameof the equipmen tandNo. TechniquedeviceandNo.T e c h n i c a l c l a s s Standard
2、 time dep th (m m) Velocityper minutes Numberofrotation andreciprocation Fee d(m /ror mm/ min fixtur e Cutting tool Ins pec tion tool sin gle Pre par e desi gne r Edi tor AuditSign Table4-3operationalSheet Beforeproductsaremanufactured,technical andproductionpreparationcanbemadeaccording tothedemand
3、sofprocessplanningsheet. Accordingtotheprocessplanningsheet,thekinds, typeandnumberofmachinetools,theproductionarea needed, the plan arrangement of equipment, the number,typeandclassofoperatorsrequiredcanallbe decided. Then, the planning of factory preparation, enlargingorrebuildingwillbedecidedacco
4、rdingly. fact ory Oper.sheet Nameofproductandtype NameofpartDrawingNo materialna me Raw materia l type Part weight (kg) Rough weight TheNo.of page cod edimensions Net weight Page Number Ch ar. Numberin everyproduct Batch size o p e r . N o Nameofoperations Wo rk sho p NameofequipmentandNo. Tech.Equi
5、pment andname Cla ss of skil l Standardtime evaluation(min) Fix ture or jig Cut ting tool Ins p. tool single Prepand end Ch ang ed rem ark s Des ign er Editor aud it Sig n Table44processsheetofmechanicalmanufacturing 4.2.2 Thefunctionsofprocessplanningsheet Thefunctionsoftheprocessplanningsheetareas
6、follows: (1)Themaintechniqueforgivingregulationstoguidethe production (2) Thebasisoforganizationandmanagement (3) Themaininformationtoguidethebuilding,enlarging orrebuildingofamechanicalfactory 4.2.3 Designproceduresoftheprocess planning 4.2.3.1Designproceduresoftheprocessplanning Firstly,thefunctio
7、n,importanceandworking conditionofthepartshouldbeclarified. Ifthedesigndetailsareconsideredunreasonableor wrongduringinspection,suggestionstomodifythedesign canbeproposed. 4.2.3.1.1Theanalysisoftheprocessingperformance(加工性分析 ) 1、Inspectthedesigndrawing:checkifthedimensionsare completeandstructuralex
8、pressionisclear 2、Analyzeifthespecificationsarereasonable,including (1)thedimensionalaccuracy; (2)thegeometricalshapeaccuracy; (3)thepositionalaccuracybetweenthemainmachined surfaces (4)requirementofthesurfacequality; (5)requirementoftheheattreatment. 4.2.3.1.1Theanalysisoftheprocessingperformance(加
9、工性 分析) 3、Checkifthematerialisproperlychosen Usetheusuallyusedmaterialasfaraspossibleifit meetstherequirement,suchas45steel 4、Analysisoftheprocessingcapabilityrelatedwith thepartstructure (1)Theconceptofpartstructuralprocessingcapability:the feasibilityandeconomicalperformancewhenmanufacturinga part
10、Whenplanningthepartmachiningprocessroutine,theanalysis ofthecuttingperformanceismainlyconcerned. (2)Thelocalstructuralrequirementwhenmachiningapart(局部 结构的加工工艺性) (3)Theoverallstructuralrequirementwhenmachiningapart(整 体结构加工工艺性) ExamplesabouttChapter3Basic concepts and knowledge Basic concepts and know
11、ledge in machining processin machining process 3.1 The task and content of parts machining 3.2 Basic concepts 3.3 The location principle of workpiece 3.4 Choice of location datum and calculation of location error 3.5 Workpiece clamping 3.6 Relationship between clamping and machining accuracy 3.7 The
12、 motion analysis of machine tool 3.8 The principle and procedures of process planning 3.9 metal removal, process dimensional chain and economical machining accuracy Questions preview Questions related with “process ” (1)Have you ever heard about the word “process(工艺)” before? Can you give some examp
13、les? (2)What words will occur in your mind when people talk about “process”? Give the key words. (3)Do you think a process is unique or variational? Why? (4)According to your understanding, what will be involved in a machining process? Card of process routineCard of process routine Operation cardOpe
14、ration card The process of a product from raw material to finished machineThe process of a product from raw material to finished machine forming forming of of the the roughcast roughcast or or partcastingpartcasting、forgingforging、 punching,weldingpunching,welding、pressingpressing、agglomerationagglo
15、meration(烧结)、(烧结)、 infusing(infusing(注塑注塑) )、moulding moulding MachiningcuttingMachiningcutting、grinding, grinding, special special machining(non-machining(non- conventional machining) conventional machining) Materials Materials properties properties adaptation adaptation and and treatmentheat treat
16、mentheat treatment,electroplatetreatment,electroplate、coating, filming coating, filming Machine Machine assembleconnect assembleconnect the the parts parts according according to to the the definite definite relationship relationship and and specification, specification, including including part par
17、t fixing, connection, adjustment, balance, inspection and testfixing, connection, adjustment, balance, inspection and test 200.07 21 0.8 Engineering drawing of a laddered shaft 32 40 250.07 35 0 -0.017 0.8 0.8 35 40 30550 150 其余 倒角145 3.2 21 Question: Can you tell the functions and specifications(技术
18、条件) for these parts? A screw to be machined 3.1 The task and content of parts machining Manufacturing is to utilize and manage materials, people, equipment, and money to produce products. To achieve a successful and economical manufacturing, the planning must be made from the beginning of the design
19、 stage and go through the selection of materials, processes, equipment, and the scheduling of production. The essential of manufacturing is to turn raw material (or semi-product) into finished product which satisfies the requirement. The task of machining is to turn the raw material (roughcast) into
20、 the finished parts which satisfied the requirement of product. Machining involves the method (means) and process. 3.2.1manufacturingprocess(生产过程) The process of a product involves: Product design and prepare、transport of the raw and processed materials、roughcast forming、machining 、heat treatment 、
21、assembly、 deburring、test 、painting and packing. These related processes constitute the so-called “production process”. It is usually completed by the coordinated work of different factories or workshops. 3.2 The basic concepts in machining 3.2.2 Processofapart(工艺过程) Process of a part: The process by
22、 which the shape, dimensions and performance of raw material or rough casting are changed and turned into the desired parts directly by machining is called the process of a part, or part processing route. When parts are assembled into a product, it is called the assembly process. 4.1.2.1 Whatconstit
23、utesapartprocess? Part process consists of one or several operations in sequence. A rough casting can be turned into a finished or semi-finished product by the operations. (1)Operations orjobs(工序) The job finished by one operator (or a group of operators) who works in a fixed work position(one machi
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