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所在平台: Udemy |
课程主页: https://www.udemy.com/course/technical-training-on-plastics-and-tooling/
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Coursera 塑料与模具技术培训课程概述 本课程旨在全面深入地讲解塑料与模具制造的关键技术。 **核心内容包括：** * **稳健成型工艺：** 探讨什么是稳健的成型过程，以及零件一致性（零件到零件、批次到批次）和模具一致性的重要性。 * **塑料原材料基础：** 介绍聚合物家族，区分通用塑料、工程塑料和特种塑料，并深入理解聚合物金字塔、非晶态和半结晶态塑料的特性与行为。 * **塑料原材料选择：** 详细讲解不同聚合物牌号，并根据具体应用需求（如阻燃性、耐化学性、热性能、户外耐候性、水接触等）进行选择。 * **塑料原材料进阶：** 理解均聚物、共混物和共聚物，并学会详细解读聚合物数据表。 * **制造工艺与设备：** 介绍各种塑料制造工艺，特别是注射成型机的详细原理，包括螺杆、加热原理、常见损坏，以及锁模单元、锁模力计算、注射量考虑和设备选型指南。 * **材料准备：** 讲解原材料的储存、运输、混合和预干燥。重点强调预干燥的重要性、不同聚合物的需求、过度干燥的负面影响以及不同聚合物的累计干燥时间。介绍干燥方法、设备类型、未干燥材料的迹象、吸湿事实和水分分析。 * **工艺建立：** 阐述成型工艺的建立与优化流程，模具验收流程图，以及填充、保压、切换点的理解。同时分析进料系统中的压降。 * **模具设计：** 涵盖不同类型的注塑模具，进胶口设计与尺寸、流道平衡、喷嘴尺寸、冷料井、进胶口类型，以及如何根据材料剪切速率、注射时间、进料系统压降和进胶口冻结时间来确定进胶口尺寸。探讨进胶口定位与数量，流道截面与进胶口类型的关联，以及冷却系统、模具热稳定性、模具绝缘和基于不同聚合物的排气设计。提供工程塑料模具设计的关键技巧。 * **故障排除：** 详细讲解注塑成型缺陷及其解决方案，包括银纹、柴油效应、熔接线、顶针痕、进胶口发白、凹痕、飞边、欠注、气泡、喷射、缩痕、翘曲、黑点、拉痕等。深入理解塑件内应力、因内应力导致的零件失效及其解决方案。讨论喷嘴对树脂的影响以及注射机喷嘴造成的降解。 * **产品设计：** 探讨什么是优秀的产品，塑料零件的设计原则，以及加强筋、柱头等特征的设计。讲解拔模斜度、不同聚合物牌号的流动长度、尺寸稳定性和可达到的公差。 * **应用开发：** 深入研究各种聚合物应用，如抗静电、防雾、阻燃、水管理、户外应用、导热、电磁屏蔽、喷漆、电镀、医用生物相容性、润滑与低摩擦、航空航天等。 本课程旨在为学员提供在塑料与模具行业中所需的全面技术知识和实践指导。
Class overviewRobust molding process: Training covers what is a robust molding process. What is part to part consistency, run to run consistency, tool consistency.Plastics raw material basics: Family of polymers. Understanding commodity plastics, engineering plastics, specialty plastics. Polymer pyramid. Amorphous and semi-crystalline plastics, their property, and behaviors.Plastics raw material selection: In-depth understanding of various polymer grades, selection based on application requirements. Eg:- Flaimmablity, chemical resistance, thermal performance, outdoor weathering, water contact, etc..Plastics raw material advanced: Understanding of homopolymers, blends, copolymers. Datasheet interpretation of polymers and understanding properties in detail.The manufacturing process and machine: Introduction to the different plastic manufacturing processes, Injection molding machines in detail. Injection molding machine screw, heating principle, typical damages in the machine screw. Clamping unit and clamping calculations. Shot size consideration. Molding machine selection guidelines.Material preparation: Storage of raw material, transport, mixing, and pre-drying. Importance of pre-drying, consideration for different polymers, over-drying and its adverse effect, cumulative drying time for various polymers. Methods of drying and different types of equipment. Signes of undried material, moisture absorption facts, moisture analysis.Process establishment: Procedure to establish and fine-tune molding, mold qualification flow chart. Understanding fill, pack, switchover point. Understanding pressure drop in the feed system.Tool design: Different types of injection molds. Feed design and sizing, runner balancing, nozzle sizing, cold slug, types of gate, deriving gate size by understanding material shear rate, injection time, pressure drop in the feed system, gate freezing time. Gate positioning and number of gates. Runner cross-section and gate type correlation. Cooling system and thermal stability in a mold. Mold insulation. Air venting based on different polymers and their positioning. Key mold design tips for engineering plastics.Troubleshooting: Molding defects and solution. Different types of injection molding defects such as silver streaks, diesel effect, weld lines, pin marks, gate blush, record grooves flash, shot shot, blisters, jetting, sink marks, warpage, black specks, scoring. Detailed understanding of molded-in stress, part failure due to molded-in stress, and solution. Nozzle effect on resin, attending hangouts, and degradation due to injection molding machine nozzle.Product design: What is a good part, plastic part design principles, guidelines for designing various features like ribs, bossed, etc.. Draft angel. Understanding flow length of different polymer grades, dimensional stability, and achievable tolerance for different polymer compounds.Application development: Detailed understanding of various polymer applications such as antistatic, ant- fog, fire retardant, water management, outdoor, thermally conductive, EMI shielding, Painting, plating, medical bio compactable applications, lubricating and low friction, aerospace, etc..
