文明从我做起书信格式Word文档格式.docx
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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