模具专业英语课件-PPTUnit_Three

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'模具专业英语课件-PPTUnit_Three'
Unit Three Mold Constructions Passage One Plastics Forming and Molds Passage Two Three -plate Injection Molds Passage Three Pressure Casting Dies Passage Four Piercing Die and Blanking Die DesignUnit Three Mold Constructions 1 Passage One Plastics Forming and Molds 1.General The continuing development of injection mold technolo- gy demands more and more of the processes. The most important problem in the process of injection molding is undoubtedly the correct design of injection mold, because the molding shop has little influence, if any, on the construction of the machine①. Efficient production of the most diverse injection - molded parts depends primarily on the injection mold. The durability of the molds depends on their care and treatment. Since the moving components and cavity of the mold are always hardened and ground, they should produce between 500 000 and 1 000 000 000 shots. Unit Three Mold Constructions For ease of construction and to lower manufacturing cost, injection molds are becoming standardized. Some firms offer ready -made bases of square or round design as standard or stripper plate molds for immediate use. Only the inserts then have to be fitted into the bases. 2.Basic Mold Construction (1)Operating Principle Basically the injection mold consists of two halves. One mold half contains the sprue bushing and runner system, the other half houses the ejection system. The molded part is located at the parting line(ref. To DIN 16700). (2) Single or Multicavity Molds To set up a calculation conceiving the choice of cavities in an injection mold requires accurate knowledge of the material to beUnit Three Mold Constructions processed, of the injection -molding machine and of the molds. The mold costs increase with the rising number of cavities and the relative machine costs decrease. The production time required for a given molded part depends on the wall thickness, the injection speed, the recovery rate, the time required to cool the molded material, the cooling capacity of the mold and the necessary incidental time such as duration of pressure holding time, ejection time, delay time, etc. Therefore the decision concerning the number of cavities to be determined depends on: ①size of the order(number of molded parts in connec- tion with delivery time); ②shape of the molded parts(size, quality require- ments); Unit Three Mold Constructions ③injection -molding machine( clamping force, plasti - cizing and injection capacity); ④mold costs. There are several known procedures for calculating the economical number of cavities. Unfortunately they are so varied that it is impossible to condense them. As an example: The theoretical max. number of cavities is: F1=Max.injection volume of machine(cm3)/Volume of molded parts,sprue and runner(cm3) F2=Plasticizing capacity(cm3/min)/Number of shots/min× (part,sprue and runner(cm3)) F2 must be equal to or smaller than F1. F1 is the maximum number of cavities attainable. Unit Three Mold Constructions Not e s : ① The most important problem in the process of injection molding is undoubtedly the correct design of injection mold, because the molding shop has little influence, if any, on the construction of the machine. 注射成型过程 中最重要的问题毫无疑问是注射模具的正确设计,因 为成型车间对注射件的影响很小,即便有,也是对机 器的结构有影响的。 句中“if any”引出转折状语从句,译为“即便要”。 Unit Three Mold Constructions New Words and Expressions : injection mold注射模具 molding shop成型车间,造型车间 injection -molded注射成型的 grind[ r ind](ground,ground) v.磨削,磨光 single -cavity mold单型腔注射模具 multicavity mold多型腔注射模具 clamping force夹紧力,合模力 plasticize[ pl stisaiz] v.(使)成为可塑;(使)可塑 injection capacity注射容量 Unit Three Mold Constructions E x e rcises: What's the advantage of standardization of injection molds? From the above, what does the decision concerning the number of cavities to be determined depend on? Unit Three Mold Constructions 参考译文: 译 塑料成型与模具 1.概要 注射模技术的不断发展需要越来越多的工艺流程。注 射成型过程中最重要的问题毫 无疑问是注射模具的正确 设计,因为成型车间对注射模具的影响很小,即便有,也 是对机器的结构有影响的。高效率地生产各类注射成型零 件首先取决于注射模具。 模具的使用寿命取决于对它们的维护保养和加工处理, 例如对一些活动件及型腔的 表面硬化和磨削加工,使得 它们的生产批量可以达到500 000~1 000 000 000件。 为了简化模具结构和降低制造成本,使注射模具标准化, 许多制造商提供了已经生产 好的标准方形或圆形底Unit Three Mold Constructions 及脱模板供直接使用
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