本文以六西格玛质量管理理论为基础，分析了 SEP 公司质量管理的现状和存
在的问题。以电梯门板平整扭曲度改进项目为例，运用 DMAIC 过程改进模型，研
究了该项目定义、测量、分析、改进和控制等各阶段的过程改进和方法。其中包
括确定项目目标，创建项目团队，制定项目计划，把客户声音转化为质量评价指
标；检验测量系统的可靠性和准确性，综合运用头脑风暴法、因果分析法（鱼骨
图）、潜在失效模式分析（FMEA）和柏拉图等方法，通过测试验证找出了影响电
梯门板平整扭曲度的 3 个关键因素，有针对性地采取了改善和控制措施。研究发
现，改善后每百万缺陷数（DPPM）、平整扭曲度（CPK）、西格玛水平等接近项目
的目标值，基本实现了预期的财务收益目标，同时减少了顾客抱怨。针对 DMAIC
工具的使用、项目团队建设和培训等方面，提出了提升企业六西格玛管理水平的
具体建议。
本文研究成果对于电梯制造等相关企业推行六西格玛管理有借鉴和参考价
值。
关键词：六西格玛；DMAIC；电梯门板；平整扭曲度；过程能力
Research on Six Sigma Management by SEP
Specialty: Business administration
Name: Kong Weijin
Instructor: Liu Hua Professor
Abstract
With the development and popularization of high-rise buildings in Chinese cities,
the accidents of elevator have also occurred. In that case，the security and reliability of
elevator products have been paid more and more attention. It is not only an opportunity
that elevator manufacturing enterprises get more and more market with economic
development, but also elevator manufacturing enterprises have been confronted with
challenge of quality management level. In this context, Sematic Elevator Products
(Suzhou) Co.，Ltd (SEP) has been taken for an example as an elevator manufacturing
enterprise, which is practical significance that the application of Six Sigma management
in SEP has been researched.
The existing problems belong to quality management in SEP company have been
analyzed based on the Six Sigma quality management theory in this paper. The elevator
door flatness- twist improvement project has been taken for an example, and researched
the project about definition, measurement, analysis, improvement and control etc. by the
improved model using DMAIC process. This include defining project goals, creating
the project team, project planning, transferring the voice of the customer into quality
evaluation; the reliability and accuracy studying of the measurement system, the
brainstorming, causal analysis (fishbone diagram), failure mode and effects analysis
(FMEA) and Pareto method are used in this project, three key factors of impacted
flatness-twist of elevator door panel were identified by this research and test. Then,
relative actions of improvement have been taken based on these factors. The result show
that the number of defects per million (DPPM), flatness-twist (CPK) and sigma level
have mainly reached the target defined of the project after improvement. It brought
about that the project has been got the basic realization of the expected financial returns
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