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1、精密注塑技术 Aspects for Precise Injection Molding,2,内容提要 Overview,精密注塑的定义 Definition Precise Injection Molding 锁模系统 Clamping Unit 锁模力 Clamping Force 选择注射装置的准则 Criteria to Select the Injection Unit SELOGICA 控制器 SELOGICA Controller 模具设计 Mold Design 模具温度控制 Mold Temperature Control,3,精密注塑的定义 Definition Preci
2、se Injection Molding,小的尺寸和公差 轻的部件重量 为特定产品配备注塑设备 灵活的机器配备（一台机器可适用于多种模具) 稳定的质量，高的重复性,Small part dimension and tolerance Low weight Adaptation of machine performance to the parts Flexible machine configuration (many molds suitable for one machine) Stable quality, reproducibility,4,锁模系统 Clamping Unit,合模系
3、统起重要的作用 动模板是稳定而经过证实的箱型结构 长而精确的导向 模板平行度的调节 50 吨范围内 0.05 mm 极高的刚度,For precise injection molding, the clamping take over a very important part. movable platen as stable and proven box-type platen long and precise guiding of the movable platen adjustable parallelism up to 50 to. Machines 0.05 mm high ri
4、gidity,5,锁模力 Clamping Force,精密注塑的另一个重要因素是锁模力。 原因是： 模腔更好的排气 （90%的空气从分型面排出） 减少机器和模具的磨损 节省能源 One other important aspect for precise injection molding is the clamping force. Reasons for that are: Much better venting of the cavities during injection. (ca. 90% of the air inside the cavity escape over the
5、parting line) To prevent machine and mold from unnecessary wear. Saving energy,6,锁模力 Clamping Force,怎样计算锁模力 锁模力 = 单位锁模力 X (产品投影面积 + 流道投影面积） 如果有滑块，需要将滑块投影面积的 30% 加入产品投影面积 How to calculate the clamping force ? If the mold contains sliders! You have to add 30% of the projected slider area to the projec
6、ted area of molded part.,7,锁模力 Clamping Force,单位锁模力的确定可使用以下图表 To define the necessary specific clamping force, use one of the pictures below.,For standard partsfor thin walled parts with long flow paths,8,锁模力 Clamping Force,举例 Example: 接插件 Connector PA6 长度 Length: 6 cm宽度 Width: 1.5 cm浇道投影面积 Proj. ar
7、ea sprue: 8 cm2 单位锁模力 Spec. clamping force: 6 kN/cm2 模穴数 8 cavities,9,选择注射单元规格的准则Criteria to Select the Injection Unit,10,每一机器尺寸 Each machine size,选择注射单元规格的准则Criteria to Select the Injection Unit,模块化 Modularity,11,选择注射单元规格的准则Criteria to Select the Injection Unit,注射单元的欧洲橡塑机械协会(EUROMAP)规格表示注射单元的最大注射功。
8、 计算方法 最大注射压力 X 最大行程容量 / 1000 举例 按注塑机 320 C 600-250 规格表 最大注射压力(35 mm 螺杆）： 1820 bar 最大行程容量 144 ccm 1820 bar X 144 ccm /1000 250,The size of the injection unit is according to EUROMAP and indicates the working performance of the injection unit. The working performance is calculate max. spec. injection
9、pressure x max. stroke volume / 1000 Example: According to the technical data of 320 C 600-250 Max. Injection pressure (screw diameter 35mm) = 1820 bar Max. Stroke volume = 144 cm3 1820 bar x 144 cm3 / 1000 250,12,选择注射单元规格的准则Criteria to Select the Injection Unit,注射功 Working performance,! 相同螺杆直径，但不同注
10、射压力 ! Same screw diameter but different max. injection pressure,13,选择注射量的准则 Selection criteria shot volume,选择注射单元规格的准则Criteria to Select the Injection Unit,14,选择注射单元规格的准则Criteria to Select the Injection Unit,Example: Connector (PA6), 8 cavities, 26.5 g shot weight Results according the list below:,(
11、1) The injection volume must be on average 25% greater than the volume of the injected part (incl. sprue) due to shrinkage during solidifying and due to the compression of the melt during injection.,15,选择注射单元规格的准则Criteria to Select the Injection Unit,Example: Connector (PA6), 8 cavities, 26.5 g shot
12、 weight 2nd example, calculation with shot weight Results according the list below:,16,选择注射单元规格的准则Criteria to Select the Injection Unit,滞留时间准则 滞留时间 = 塑胶进入料筒到离开喷嘴的时间 PE,PP,PS: 最少 30 秒 (大于 40 秒为好) PA, POM, PBT: 最少 60 秒 (75 秒为好),Selection criteria dwell time dwell time = from the entree of material int
13、o the cylinder until the exit out of the nozzles,e.g. PE, PP, PS : min. 30 s (better 40 s) e.g. PA, POM, PBT : min. 60 s (better 75 s),17,选择注射单元规格的准则Criteria to Select the Injection Unit,Example: Connector (PA6), 8 cavities, 26.5 g shot weight (29.31 cm3) Result according to the list below, dwell ti
14、me for PA6 min. 60 sec.,Remarks: an extended screw and cylinder can increase the dwell time!,18,选择注射单元规格的准则Criteria to Select the Injection Unit,Selection criteria material throughput Example: Connector (PA6), 8 cavities, 26.5 g shot weight,19,错误的选择会造成 Mistakes in selection causes e.g. to - 不完全熔化的粒料
15、 - Unmelted granulate - 混色不均 - Color steaks - 烧焦 - Burnt streaks,选择注射单元规格的准则Criteria to Select the Injection Unit,20,其他准则包括所用材料的加工温度 有些工程材料（如 PEEK,PEI,LCP 等）需要接近 450 摄氏度的加工温度 料筒加热圈应使用陶瓷绝缘加热圈 Further criteria for the injection unit is the temperature range of material to be used.Some high technology
16、plastics (e.g. PEEK, PEI, LCP, etc) requires a temperature release of the machine up to 450 (500) deg. C. Therefore the plasticizing cylinder has to be equipped with ceramic isolated heaterbands.,选择注射单元规格的准则Criteria to Select the Injection Units,21,选择注射单元规格的准则Criteria to Select the Injection Units,- 注射控制的方式 - -conceptions of injection regulation- 标准方式：注射闭环控制 basic configuration injection regulation 扩展方式（可选件）：螺杆精确定位 extension stage (option) position regulation screw (
