摘 要

AutoCAD軟件最大的特點(diǎn)是具有開放性。為了提高設(shè)計質(zhì)量及設(shè)計效率，目前比較普遍的做法是以AutoCAD為支撐平臺，二次開發(fā)各種專業(yè)CAD軟件。Visual Basic(簡稱VB)引入面向?qū)ο蟮木幊虣C(jī)制，使用窗體和控件等可視化界面設(shè)計應(yīng)用程序，提高了應(yīng)用程序的開發(fā)效率。彈簧是使用廣泛的機(jī)械零件，彈簧參數(shù)較多，類型各異，所以在設(shè)計和繪圖時較為復(fù)雜。本文研究了以模塊化設(shè)計思想為指導(dǎo)，用VB6.0為開發(fā)工具，在AutoCAD平臺上二次開發(fā)少片變截面鋼板彈簧CAD系統(tǒng)的原理和實(shí)現(xiàn)方法。
本文主要研究內(nèi)容如下:
文中對汽車少片變截面鋼板彈簧現(xiàn)行的各種設(shè)計計算方法進(jìn)行了深入細(xì)致的分析與研究，總結(jié)歸納了各種計算方法的特點(diǎn)、局限性及適用范圍。在此基礎(chǔ)上，詳細(xì)闡述了汽車鋼板彈簧設(shè)計計算的原理、力學(xué)模型及求解方法
本系統(tǒng)包含兩個部分，一個是設(shè)計計算系統(tǒng)，一個是自動繪圖系統(tǒng)。自動系統(tǒng)實(shí)現(xiàn)時首先要將VB與AutoCAD連接起來，在程序中要創(chuàng)建并調(diào)用圖層，創(chuàng)建圖形實(shí)體。
經(jīng)過測試 ，Spring-CAD系統(tǒng)集設(shè)計計算、校核和繪圖于一體，能提高彈簧設(shè)計人員的工作效率，具有較強(qiáng)的工程應(yīng)用性和良好的可擴(kuò)展性。



關(guān)鍵詞：少片變截面鋼板彈簧，AutoCAD二次開發(fā)，Visual basic6.0


Abstract

AutoCAD software has a distinctch aracteristic of open.In order to improve design quality and efficiency, and to standardize design, a common way now is secondarily-develop various professional CAD software on support platform of AutoCAD. The development environment provided by Visual Basic (i.e. VB) has the totally same interface as Windows. Besides, VB has introduced the programming technique aiming at targets, and has used visible interface such as forms and widget to design application program, improving development efficiency of application program. Spring is a widely common used machine part.Because spring has lots of parameters and diferent types,it is extremely inconvenient when designing and drawing. Guided by the thinking of modular design and using VB6.0 as development tool, the theory and method of spring computer aided design system (i.e. Spring-CAD) on the platform of AutoCAD are studied in this articl
The major research content of this paper are as follows：
In this paper ,there are detailed researchs about the method of the design for taper leaf spring .Summarized the the features, limitations and scope of application of each method.then, expatiated the principle,mechanical model and solution for the design of the taper leaf spring
This system contains two parts,which one is design system and the other is auto-drawing system. When implementing auto-drawing system,firstly connect VB with AutoCAD,set up and invoke graphic layer in program,set up graphic entity .
By testing,this Spring-CAD system,integrating design computation,checking and drawing,has improved spring designers' work efficiency and has great practicality.

Key words： Taper Leaf Spring, Re-development ,AutoCAD, Visual Basic6.0

目 錄

中文摘要 Ⅰ
ABSTRACT Ⅱ
1 緒論 1
1.1鋼板彈簧的分類 1
1.2少片變截面鋼板彈簧的特點(diǎn) 2
1.3 CAD二次開發(fā)技術(shù)理論 2
1.3.1 CAD二次開發(fā)技術(shù)簡介 2
1.3.2 CAD技術(shù)發(fā)展現(xiàn)狀 3
1.4研究的主要內(nèi)容和意義 3
2少片變截面鋼板彈簧CAD系統(tǒng)功能分析及總體設(shè)計方案 5
2.1少片簧CAD系統(tǒng)功能分析 5
2.2系統(tǒng)總體設(shè)計方案 5
2.2.1 AutoCAD二次開發(fā)技術(shù)方案對比 5
2.2.2 AutoCAD二次開發(fā)語言選擇 6
2.2.3少片變截面鋼板彈簧CAD系統(tǒng)設(shè)計思路 8
3．少片變截面鋼板彈簧的設(shè)計計算 9
3.1少片變截面鋼板彈簧初步選型 9
3.1.1 簧片斷面形狀 9
3.1.2 簧片端部形狀 9
3.2少片變截面鋼板彈簧結(jié)構(gòu)形式 10
3.2.1拋物線型葉片彈簧 10
3.2.2梯形葉片彈簧 11
3.2.3寬度漸變式葉片少片簧 12
3.3 彈簧的受力分析 12
3.3.1單片變形 12
3.3.2少片簧的片端力 14
3.4梯形截面彈簧設(shè)計計算 15
4少片變截面鋼板彈簧CAD系統(tǒng)的實(shí)現(xiàn) 20
4.1系統(tǒng)界面設(shè)計 20
4.2設(shè)計計算系統(tǒng)程序設(shè)計 21
4.3繪圖系統(tǒng)程序設(shè)計 23
4.3.1AutoCAD對象 23
4.3.2連接AutoCAD 24
4.4程序功能測試 26
5結(jié)論 28
致謝 29
參 考 文 獻(xiàn) 30