毕业论文 微型液压卧式螺杆注塑机系统设计.doc

毕业论文 微型液压卧式螺杆注塑机系统设计

目  录

摘要　…………………………………………………………………………………………　Ⅰ
Abstract ………………………………………………………………………………………  Ⅱ
第一章  前 言 ………………………………………………………………………………  1
  1.1微型注塑机发展现状及趋势 …………………………………………………………  1
  1.2 本课题研究目的及意义 ……………………………………………………………… 1
 第二章 注塑机的概况 ……………………………………………………………………… 3
  2.1 注塑机的组成 ………………………………………………………………………… 3
  2.2 注射机生产工作过程 ………………………………………………………………… 4
  2.3 注射机的分类 ………………………………………………………………………… 4
第三章 注射装置设计 ………………………………………………………………………  7
  3.1 注射装置类型 ………………………………………………………………………… 7
  3.2 注射装置对比选择 …………………………………………………………………… 8
  3.3 螺杆对比选择 ………………………………………………………………………… 8
  3.4 螺杆设计计算 ………………………………………………………………………… 9
  3.5 螺杆头选型设计 ……………………………………………………………………… 10
第四章 注射系统设计 ………………………………………………………………………  12
  4.1 料筒设计 ……………………………………………………………………………… 12
  4.2 喷嘴选型设计 ………………………………………………………………………… 13
第五章 合模系统设计 ………………………………………………………………………  14
  5.1 合模系统类型对比选择 ……………………………………………………………… 15
第六章 液压系统设计 ………………………………………………………………………  15
  6.1 传动系统的种类和特点 ……………………………………………………………… 16
  6.2 液压传动 ……………………………………………………………………………… 16
  6.3 液压系统原理设计 …………………………………………………………………… 18
  6.4 油泵类型的比较与选用 ……………………………………………………………… 20
  6.5 液压系统有关计算 …………………………………………………………………… 24
第七章 模具设计 ……………………………………………………………………………  26
  7.1 塑料材料的分析 ……………………………………………………………………… 26
  7.2 拟定模具的结构形式 ………………………………………………………………… 30
  7.3 浇注系统的设计 ……………………………………………………………………… 31
  7.4 成型零件的结构及设计计算 ………………………………………………………… 33
  7.5 模架的确定 …………………………………………………………………………… 35
  7.6 其他机构的设计 ……………………………………………………………………… 37
参考文献 ……………………………………………………………………………………… 39
总结与展望 …………………………………………………………………………………… 40
致谢 …………………………………………………………………………………………… 41
 
微型液压卧式螺杆注塑机系统设计

摘要: 卧式注塑机：这是最常见的类型。其合模部分和注射部分处于同一水平中心线上，且模具是沿水平方向打开的。其特点是：机身矮，易于操作和维修；机器重心低，安装较平稳；制品顶出后可利用重力作用自动落下，易于实现全自动操作。其缺点是：模具安装比较麻烦，嵌件发表过如模具有倾斜或落下之可能，机床占地面积较大。目前，市场上的注塑机多采用此种型式。其工作原理如下：卧式注塑机是由料斗加入的塑料在螺杆的带动下，沿螺旋槽向前输送。由于外加热圈的加热和螺杆剪切摩擦生热的作用，塑料变为粘流态，螺杆在转动的同时后退。当螺杆头部积存的熔体压力达到一定值时，螺杆接触行程开关而停止转动和后退，准备下一阶段的注射。注塑成型是一个循环的过程，每一周期主要包括：定量加料——熔融塑化——施压注射——充模冷却——启模取件。取出塑件后又再闭模，进行下一个循环。注塑机的电能消耗主要表现在以下几个部分：
①液压系统油泵的电能消耗 ②加热器的电能消耗 ③循环冷却水泵的电能消耗（在注塑车间内，一般多台注塑机共用一台冷却水泵），其中液压油泵电机的用电量占整个注塑机用电量的80%以上，所以降低其耗电量是注塑机节能的关键。

关键词：微型卧式注塑机   螺杆  电能消耗 

   Miniature hydraulic horizontal screw injection molding 
          machine system design
              
Abstract： Horizontal injection molding machine: This is the most common type of. The clamping part and injection part is in the same horizontal center line, and the mold is opened along the horizontal direction. Its characteristics are: low fuselage, easy to operate and repair; machine low center of gravity, the installation is more stable; products after ejection can use gravity automatically fall, easy realization of full automatic operation. Its disadvantages are: die more troublesome installation, insert published as die with inclined or the fall of May, covers an area of large machine tool. At present, the market of the use of such type of injection molding machine. Its working principle is as follows: horizontal injection molding machine is composed of a hopper to join the plastic in the screw drive, along the spiral groove of forward conveyor. As a result of external heating coil heating and screw shear friction role, plastic to flow, screw while turning back. When the screw head of accumulated melt pressure reaches a certain value, the screw contact trip switch and stop the rotation and back, ready for the next stage of injection. Injection molding is a cycle, each cycle includes: quantitative feeding -- -- -- pressure melting and plasticizing injection mold filling cooling -- opening mould and parts. Remove plastic parts later again closed die, for the next cycle. Injection molding machine power consumption is mainly manifested in the following sections:Hydraulic system oil pump of the electric energy consumption of electric energy consumption of the heater and the cooling water circulating pump power consumption ( in injection molding workshop, the general number of injection molding machines to share one cooling water pump ), in which the hydraulic oil pump motor power consumption accounts for the injection molding machine with capacity of more than 80%, so reducing its power consumption is injection molding machine key.

Key word: Miniature horizontal injection molding machine    screw     Electric energy consumption