导　　师： 杨雷;蔡延彬

学科专业： 1201

授予学位： 硕士

作　　者： ;

机构地区： 华南理工大学

摘　　要： 产品生产周期过长是我国目前起重机械制造行业普遍存在的问题。产品生产周期优化，对于提高企业竞争力和客户满意度有着重要的意义，而以消除一切无效劳动和浪费为核心的精益生产理论是目前公认的对缩短产品生产周期、提高生产效率最为有效的方法。 本文以精益生产理论为基础，以WT公司起重机械产品生产流程为研究对象，对产品的生产周期进行优化改善。首先介绍国内起重机械行业状况和WT公司目前的生产现状，利用价值流图分析工具绘制公司现状价值流图，根据价值流现状分析与评估当前的生产运作情况，找到生产流程中造成生产周期过长的主要原因，确定缩短生产周期的关键点，并制定缩短生产周期的优化方案。然后利用计划评审技术选择生产流程中的关键路径，以此为基础制定更加合理的生产计划；利用设备布置优化解决工位之间距离长、搬运多的问题，从而缩短生产周期；通过防错技术的应用，解决了焊接工序中因返修次数过多导致生产周期增加的问题。最后通过改善前后的对比，对优化方案的实施效果进行验证。 本文通过对WT公司起重机械产品生产周期的优化，解决了一些生产过程中长期存在的问题，对行业内的企业有一定的借鉴作用，同时也探讨了目前我国特种设备制造行业中精益生产理论应用的可行性。 Long lead time is a widespread problem in hoisting machinery manufacturing industry inChina. It is very important to optimize lead time for improving competitiveness andcustomer’s satisfaction. Lean production, which eliminate all invalid labor and waste at thecore, is recognized as the most effective methods to shorten lead time and improveproductivity. Lead time of WT’s hoisting machinery production processes is optimized in this paperbased on the theory of lead production. First, domestic hoisting machinery industry conditionsand WT's production status are introduced. By using VSM to outline WT’s current valuestream map for analyzing and evaluating the current status production and operation, the mainreason about the long lead time in the production process is found; the critical points toshorten the Lead time are ascertained, and the lead time optimization program is developed.Then, by using PERT to select the production process critical path, a more rational productionplan is developed based on it; by using equipment layout optimization to solve problemsabout long distance and transport between stations, lead time is shortened; by applyingMistake-proofing technology, lead time problem due to too many times welding processrework is solved. Finally the implementation effect of optimization programs is verifiedthrough contrast before and after being improved. Through the lead time optimization of WT's hoisting machinery, some of the productionprocess of long-term problems existed in the industry are solved. It will be help with somereferences for companies in this industry. And the feasibility of special equipmentmanufacturing industry is also explored in the application of lean production theory.

关 键 词： 起重机械 生产周期 精益生产 价值流图

分 类 号： [F273.2 F426.4]

领　　域： [经济管理] [经济管理] [经济管理]