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设计总说明本设计内容是年产20万套的保险杠的车间工艺设计。通过查阅各方面的相关资料，按照设计任务要求，完成设计的各部分内容。先按照产品质量要求设计配方，选择成型方式，再设计总工艺流程和造粒成型参数的设计与计算，从而确定了设备型号，最后再由物料衡算、能量衡算到非车间工艺、经济核算和车间布置，逐一将设计内容充分完善。4844
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鉴于PP/EPDM专用料，根据两种选择相应的配方加以性能比较，选择合适的助剂，提供配方依据和各组分比例及其各组分的性质。同时查找进货渠道，生产厂家，价格等。
重点介绍了生产工艺的确定，在各种不同保险杠的生产方法中，针对PP/EPDM专用料，选定注射成型工艺，并进一步采用多级注射的方法来提高产品性能。多级注射结合高速和低速注射的优点，能充分发挥注塑机成型性能，适应加工几何形状复杂的制品，适应流道和型腔各断面流动变化。在整个工艺流程中给出多级注射工艺参数，如加工温度、选用设备和成型周期等详细内容。然后对共混挤出造粒加以完整的工艺叙述，分析不同的投料顺序对粒料性能产生的影响。
在设备选型中，根据在工艺流程中确定的工艺参数选择合适的注塑机型号，再结合相关的资料，确定此次设计所选择的相关设备如辅机、计量设备、输送设备、干燥设备、造粒设备等。
通过物料衡算，确定了工作时间、主要设备的相应台数。同时，罗列出了各个过程中产量及损失和废品量，为设计所需的原料量提供了有力的参考依据。具体到每小时、每班、每月、每年。
在能量换算的内容里，通过注射成型机和模具部分能量衡算以及双螺杆挤出能量衡算的计算，得到冷却水和冷冻水用量，并且进一步确定具体用量。同时得出此次设计得能量衡算。
非车间工艺设计中，罗列出了供电、安全、环保等非工艺因素加以考虑，并且明确了人员安排等相关事宜。
通过经济核算，对此次设计的成本进行了估算。设计最后车间布置的内容，简单介绍了车间布置的要求与原则。并且对此次设计的具体车间编排作了简要说明。
General information of design
200,000 sets per year PP/EPDM front and rear panels workshop process design was described in this article. According to the requirements of this design,every segments were completed with the reference of relevant data. The recipe was given out firstly as to meet the requirement for products qulity, and also the shaping method was decided. Then the parameters in the gross process and palletizing technique were provided, which was also the basis of devices determing. Finally, the content of the design was gradually completed through the calculation of the material balance, energy balance and non-plant technology, economic accounting, plant layout, etc.
According to this special material （PP/EPDM）, relative aid-agents were listed and compared their properties in detail, such as fillers, accelerators and antioxidants. Then the optimum recipe was chosen, suitable aid agents were selected and ratios of every component were provided. In the meantime, the production factory and price were determined.
The molding process was emphasized, and the injection molding process was chosen. Further, the multi-rate injection method was adopted, which combined the advantages of high-speed and low-speed injection, made good use of shaping, fit to processing complex products, and be suitable to adapt the flow changes of sections of runners and mold cavity. For the whole process, the parameters were provided, including processing temperature, pressure and the cycle time. And then the palletizing technique was introduced. The influence of different feeding turn on the properties of pellets was analyzed.
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