文明从我做起书信格式.docx

文明从我做起书信格式.docx

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文明从我做起书信格式

文明从我做起书信格式

One,theconceptofaletter

Thatletterisshowntosomeonesidentity,experienceandotherindolentconditionandproveaneventhistory,truthspecial-purposeletter.

Intwo,thetypesofletter

Fromwritertodifferentiate,canbedividedintoorganizationalnamecertificationletterandpersonallyissuedaletter.Aletterfromtheusepointofview,itcanbeclassifiedasmaterialisdepositedintothefileletter,thatlostdocumentssuchasindolentconditiontrueletterasproofoftheuseoflettersanddocuments.

Three,theroleofletter

Lettertounderstandandstudytherelevantpersonnelandincidenttrueindolentcondition,havingimportantcertificate,reference.

Four,thestructureandwritingaletter

Alettergenerallyconsistsofthetitle,title,body,enddate,signatureandseveralponents.

1title

Inthesecondrowcenterwrote"letter"threeyu.

2address

Underthetitletopgridtowritetheunitname,followedbyacolon.

3Text

Anotherline,beforethetwodown,writetheclearneedtoprovethatmatters.

The4ending

Anotherline,beforethetwodown,write"certify",tobringfulltext.

5signatureanddate

Inthefirststatebelowtherightproofunitnameorpersonalname,andstamporseal.In

Thebelowstatedspecificyear,month,day.

Ifitisthenameofanindividualtoacertificateissuedbythecertificateletter,theunitshallsigntheopinion,issuedbythegeneraldescriptionofproofperformance,andtoprovethelettersaidmaterialmakeclear,theneedfortheunittoaletteridentificationletterreliabledegree.Inthelowerrightofthesigntheopinion,writtenonthenameanddate,andtheofficialseal.

Five,letterwritingrequirement

1arguable,irrefutableevidence,cannothidethetruth,resorttodeceit.

2languageaurate,clear,avoidequivocation,readytoaepteithercourse.

2

Letterformatreference

Stay

Certificateforthecla（suchasgraduationcertificate,degreecertificate,marriagecertificate,notarized）provideIDandoriginalcertificatecanbe,theotherclamustprovidetheIDcard,residencebooklet,letter（forbirth,throughnotarizationmustprovideaphoto.）.

Letterofreferenceformatisasfollows:

Iunitsxxxxcountryapplytovisit（orsettled,attheirownexpensetostudy,publicschool......）,isintroducedtoyouhandlethefollowingnotarization:

1birthcertificate:

X（gender）indatedinXProvinceXXCity（orcounty）wasborn.Thefatherisxxxxxxx,motheris.

2unmarriedcertificate:

X（gender,dateofbirth,nowlivesintheBei*gCityareatoxx）datednevermarried.

[who]hasbeenthedepartureofX（gender,dateofbirth,nowlivinginxxinXcity）todatedduringhisresidenceinChinahavenevermarried.

3notcriminalsanctions:

X（gender,dateofbirth,nowlivinginxx）duringhisresidenceinChinahasnorecordofcriminalsanctions.

[who]hasbeenthedepartureofX（gender,dateofbirth,nowlivinginxxinXcity）todatedduringhisresidenceinChinahasnorecordofcriminalsanctions.

4thecertificateofkinship:

X（gender,dateofbirth）spouseisx（dateofbirth）,son（ordaughter）isx（dateofbirth）,fatherisx（dateofbirth）,themotherisx（dateofbirth）,brother（orbrother）isx（borndate）,sister（orsister）isx（dateofbirth）.

5foreigncertificateofkinship:

X（gender,dateofbirth,nowlivinginXcityxDistrict）islivingincountryxxxx（gender,dateofbirth）ofX（relationship）.

6certificate:

X（gender,dateofbirth）todatedtodatedatxxunits（fullnameshouldbewrittenas（x）titleorposition）,Xdatedtodatedatxxxxunitseither（orwhatkindofwork）.

Writing:

X

Xdated

Note:

（1）letterfromapplicantsfilemanagementdepartment,suchaspersonnel,organization,labordepartmentorofficeofthestreetsaordingtotherealsituationisresponsibleforwriting,andspecifythesource,bywritingsignature,stampdedicatedseal.

（2）thenotarizationfeesinstrictaordancewiththeBei*gMunicipalPriceBureau,Bei*gMunicipalBureauofjustice[1999]thirty-ninthdocumentstandards,totheUK,Canada,Australia,Singapore,Germany,France,Belgium,Holland,NewZealandandothercountriesofbirth,unmarried,kinship,innocent,workexperiencenotarizedeachcharge104yuan,graduationcertificate,degreecertificate,marriagecertificateandnotarialcertificateofeach128yuanof;totheUnitedStates,SouthKoreaandAustriasbirth,unmarried,kinship,nocrime,experienceeachnotary208yuan,graduationcertificate,degreecertificate,marriagecertificateandnotarialcertificateforeachcharge232yuan（smalllanguagesbyCentralCompilationandTranslationBureaustandardchargetranslationfee）.

《冲压工艺及模具》课程设计说明书

设计题目：

摩托车侧盖前支承

学

专院：

业：

机械工程学院材料成型及控制工程

叶保国

40112208学生姓名：

学号起迄日期：

xx年6月15日~xx年6月27日

指导教师：

汤剑

xx年6月23日

摘要

本次主要设计了一套冲孔、落料的模具。

经过查阅资料，首先要对零件进行工艺分析，经过工艺分析和对比，采用冲孔落料工序，通过冲裁力、顶件力、卸料力等计算，确定压力机的型号。

再分析对冲压件加工的模具适用类型选择所需设计的模具。

得出将设计模具类型后将模具的各工作零部件设计过程表达出来。

在设计说明书的第一部分，主要叙述了冲压模具的发展状况，说明了冲压模具的重要性与本次设计的意义，接着是对冲压件的工艺分析，完成了工艺方案的确定。

第二部分，对零件排样图的设计，完成了材料利用率的计算。

再进行冲裁工艺力的计算和冲裁模工作部分的设计计算，对选择冲压设备提供依据。

最后对主要零部件的设计和标准件的选择，为本次设计模具零件图的绘制和模具的成形提供依据，以及为装配图各尺寸提供依据。

关键字：

冲孔；落料；复合模具；冲裁模具；冲压设备

1绪论...................................................................1

1.1课题的研究目的和意义...............................................1

1.2文献综述...........................................................2

1.2.1我国模具工业的现状和模具技术的发展趋势........................2

1.2.2我国模具钢的发展情况...........................................3

1.2.3模具CAD/CAE/CAM技术...........................................4

1.2.4先进模具制造技术...............................................5

1.3设计内容...........................................................6

1.4本章小节...........................................................7

2模具冲压工艺分析.......................................................8

2.1冲裁件的形状和尺寸应满足以下要求...................................8

2.2冲裁件的精度与端面粗糙度...........................................8

2.3材料的冲压性能分析.................................................8

2.4材料的冲压性能分析.................................................9

3冲裁方案的确定与排样..................................................10

3.1冲裁方案的分析和确定..............................................10

3.2模具的结构形式....................................................10

3.3工序及排样图设计..................................................10

3.3.1排样设计......................................................10

3.3.2材料的利用率..................................................11

3.4本章小结..........................................................12

4冲裁模（冲孔落料复合模）分析计算.......................................13

4.1冲裁力的计算......................................................13

4.2卸料力，推件力和顶件力的计算......................................13

4.3冲裁工艺力的计算和冲压设备的选择..................................14

4.4模具压力中心的确定................................................14

4.5冲裁模刃口尺寸及公差的计算........................................15

4.6冲裁刃口尺寸的计算................................................15

4.6.1落料刃口尺寸及公差的计算......................................15

4.6.2冲孔刃口尺寸及公差的计算......................................16

4.6.3孔心距........................................................17

4.7本章小结..........................................................18

5冲裁模的结构设计......................................................19

5.1模具总体结构......................................................19

5.2工作零件的设计....................................................19

5.2.1凹模的结构设计................................................19

5.2.2冲孔凸模的结构设计............................................20

5.2.3模具主要零件的强度校核.........................................20

5.3定位零件的设计....................................................21

5.3.1挡料销........................................................21

5.3.2导正销........................................................21

5.4卸料装置设计......................................................22

5.4.1弹性卸料板的设计..............................................22

5.4.2卸料螺钉的选用................................................23

5.5模架的选用........................................................24

5.5.1模座..........................................................24

5.5.2导向零件.....................................................24

5.6连接与固定零件...................................................26

5.6.1模柄........................................................26

5.6.2凸模固定板..................................................26

5.6.3螺钉与销钉..................................................27

5.6.4垫板........................................................27

5.7本章小结........................................................27

6模具零件的固定方法..................................................28

6.1凸模的固定......................................................28

6.2凹模的固定......................................................28

6.3导柱导套的固定..................................................28

6.4模柄的固定......................................................28

6.5本章小结........................................................29

设计小结...............................................................30

*...............................................................31

致谢...................................................................33

第一章前言

本次设计的内容是摩托车侧盖前支承冲压模具。

需要成形的工件零件图如图1.1所示。

工件厚度为1.5mm，材料为Q215钢。

图1.1侧盖前支承零件示意图

1.1课题的研究目的和意义

模具是一种技术密集、资金密集型产品，在我国国民经济巾的地位也非常重要。

模具工业已被我国正式确定为基础产业，并在“十五”中列为重点扶持产业。

模具技术涉及新技术、新工艺、新材料、新设备的开发与推广应用，是一门技术综合性强的精密基础工艺装备技术，是冶金、材料、理化、计量、摩擦与润滑、机电一