在能量换算的内容里，通过挤出成型机和模具部分能量衡算的计算，得到冷却水和冷冻水用量，并且进一步确定具体用量。同时得出此次设计的耗电量。

在车间非工艺设计一章中，对车间人员的人数及其岗位进行了简要的安排。同时，也考虑了车间安全环保方面的问题，包括采暖、通风和三废治理等。

在以原料消耗表、能量消耗表以及设备综合表为依据的前提下，综合考虑其他因素，对本设计的成本进行了估算，估算的结果可以作为本设计合理性的评判条件。

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。结合设备选型以及生产工艺流程对车间进行布置，对此次设计的具体车间编排作了简要说明。其结果以车间布置平面图的形式呈现。

Gross instruction of design

The subject of this graduation project is to design the workshop process of 5000 tons U-PVC chemical pipe,which is based on the of pipe used for chemical industry.Compared to the pipe made of other material,U-PVC pipe is adopted as the optimum choice.Based on conditions of use,processing conditions and other factors to consider,standards for the pipe were developed in which the pipe pressure rating nominal diameter is 200mm,tube length is 5±0.05m.

The general contexts of this design are from the introduction to the description of the formulation and molding methods,and then from the general process to the design and calculation of parameters in each extrusion components,and the decision of devices model.And finally by the material balance,energy balance,non-plant technology,economic accounting and plant layout,the contents of design were designed to fully perfect step by step.

The first chapter is an introduction that introduces the applications and production status of plastic pipe, and compares several common pipe materials from the performance and economy perspective, PVC was chosen as an optimal material for this design.The objective and significance of this design was also defined here.Finally,the problems to be solved were taken into account in this section.

In the design of recipe,The effect of every ingredients in the recipe was elaborated firstly,and then the common materials were given in every ingredient for comparison so that we could make a better choice.Combined with the properties of PVC,the optimum recipe design was presented according to the standers for physical and mechanical performance of pipes.When selecting the ingredients,the interaction among them is also a key factor,and whether the materials is easy to get or not and the cost performance need to be considered as well.Then the proportion of the ingredients should be determined.In the end,we could present the result as a list after Synthesizing each kind of factor.

In the chapter of determination of molding methods.The common molding methods of U-PVC pipe at home and abroad were recommended comprehensively.Injection Molding and extrusion molding are compared,and finally extrusion molding is chosen as the optimum method to process U-PVC pipes.The second section highlights the working fundamentals and characteristics of extrusion molding.Combined with proposed target,and designing requirements,twin-screw extrusion U-PVC pipe was ultimately decided through the comparison of the advantages and disadvantages for single and twin screw pipe production process.

In the chapter of general process,the main production process was given at the beginning of this chapter,and the necessary brief introduction was given to this process,then the process  

flow diagrams could be determined.Secondly,production working procedure is recommend and designed in sequence based on the processing order,including molding compound preparation process,extrusion process and packing process.The key point in this chapter is to design the extrusion process.Each parameters of screw,die and extrusion head might be selected and designed in detail for design request.Finally,as an important foundation for equipment selection and material balance,optimal operating point could be figured out on the basis of parameters of screw,die and extrusion head.