GM32擠出機模具設計

機械設計制造及其自動化論文，論文編號:JX1448  論文字數:20952.頁數:36  附CAD圖

 摘     要
 隨著近年來全世界范圍內新材料技術領域的快速發展，塑料加工技術和塑料模具技術發展迅速，成為我國塑料加工業近年來連續、高速、穩定增長的重要基礎，也為塑料技術相關領域如家電、汽車、包裝等行業的發展起到了積極的促進作用。擠出技術隨著國家可持續發展政策的實施和貫徹，從過去傳統的高能耗型走向節約型、精密型，因此以提高成型制品幾何精度和內在質量均勻性為主要標志的精密化技術在近年來得到了國內外塑料加工領域的高度重視。
 多年來塑料擠出成型新技術發展的結果衍生出種類繁多的新型塑料擠出機頭機頭。近年來，一些新型塑料擠出機頭在我國的工業化應用發展迅速并快速普及，如螺旋芯棒機頭等等。結合我國塑料擠出成型技術以及新型塑料擠出機頭的發展特點和趨勢，本文簡要介紹了擠出機頭類型、通用設計原則和一般的設計程序，并對新型塑料擠出機頭設計時所涉及的基本結構、擠出內容設計作了簡介。
 本論文根據實際生產需求、成本、加工條件和材料特性等方面考慮，對原有的一些機頭設計進行分析，對優點提出了肯定，并提出了一些老式機頭設計上的缺點，通過一些經驗公式的分析和計算，在老式機頭基礎上作出了一些改良，特別是對以前內部混煉效果不良的問題進行了細致的研究，最終設計了一種在混煉效果上比以往的模具更加有效的螺旋式模具。該模具與老式模具最主要是的區別在于流道的設計上做了很大的改進，區段分布更加合理，物料的熔融效果更好。
關鍵詞：塑料 擠出成型 機頭 流道

Abstract
 In recent  years, with the rapid development of the rapid development of Plastics Processing Technology plastic mold technology and the rapid development of China's plastics processing industry in recent years, continuous, high-speed, an important basis for stable growth, has played a positive role in promoting plastic-related fields such as home appliances, automotive, packaging industry Extrusion technology with the national sustainable development and implementation of policy, from traditional to high-energy-saving type, precision, molding products, therefore in order to enhance the geometric accuracy and uniformity of the intrinsic quality as the main indicator of the sophisticated technology in recent years at home and abroad to get the field of plastic processing attention.
 Over the years plastics extrusion result of the development of new technologies derived from a wide range of new plastics extrusion die head. In recent years, some new plastic extrusion die in our application of the rapid development of industrialization and rapid popularity, such as spiral mandrel nose and so on. Combination of plastic extrusion technology in China as well as the new head of the development of plastic extrusion characteristics and trends, this paper describes the type of extrusion die, the principles of universal design and general design process, and new plastic extrusion die design by involved in the basic structure, made out of the content of the design brief.
 In this paper, based on the actual production and demand, cost, processing conditions and material properties, such as considerations for the design of the original analysis of some head, made sure of the merits, and some old-fashioned design of the shortcomings of the nose, through some experience analysis and the calculation formula, based on the old nose made some improvements, especially in internal mixing effects of previous issues of non-performing detailed study, the final design of a mixing effect in the mold than more effective spiral mold. The old-fashioned mold and mold is the most important difference is that the design of flow channel has done a lot of improvements, a more reasonable distribution of the section, the molten material better.
 
Keywords: Plastic  Extrusion  Flow  Nose
 目 錄
 第一章  緒論 1
1.1  課題背景 1
1.2  國內外技術現狀 2
1.3  塑料擠出機頭及分類 4
1.4  本章小結 4
 第二章 擠出機模具設計基礎 5
2.1  模具設計原則 5
2.2  擠出機模具設計程序 6
2.3  分析塑料熔料流變行為 7
2.3.1 塑料熔體的流變特性 7
2.3.2 塑料熔體在模頭內的流動行為 8
2.4  流道設計要素 10
2.5  機頭加熱與溫控 10
2.5.1 機頭的電加熱 10
2.5.2 機頭溫度控制 11
2.5.3 擠出機頭加熱設計要點 12
2.5.4 擠出機頭的熱平衡計算 13
 第三章 機頭機械設計 16
3.1 設計要點 16
3.2 機頭材料選擇 16
3.3 典型結構件設計 17
 第四章 GM32螺旋模具設計 22
4.1  確定模具類型 22
4.2  擠出機模具設計程序 23
4.2.1 擠出機機頭的理論計算 23
4.2.2 擠出機機頭的設計 25
 第五章 總結 30
 參考文獻 31
 致  謝 33