A car company is one of the well-known commercial vehicle manufacturers in China, and it has developed a new car. The design goal of gearbox is that the subsystem design goal is not to reduce the forward and backward momentum of gear lever, so that it can be eliminated or not obvious, and can be recognized by customers. Reduce the forward and backward momentum Xmm of the gear lever to Ymm.
Second, the project implementation process:
& lt 1 & gt； Identification definition stage:
The project team first identifies the internal and external customers of the project, identifies the customers' voices and turns them into key requirements:
(1) The shifting force is moderate.
(2) the gear is clear
(3) The whole vehicle is flexible and stable
Through QFD analysis, the project team transformed the key needs of customers into product-related needs, and finally locked in the design focus of reducing the shift lever movement.
& lt2> project design stage:
The shift lever of the whole vehicle moves back and forth, which is caused by the shift head swinging back and forth inside the transmission, and because of the lever ratio, that is, the shift lever will amplify the shift head's movement. Therefore, in order to eliminate gear shifting, it is necessary to optimize the transmission clearance of the internal gear shifting mechanism. The project team determined the potential factors affecting the transfer through principle analysis and listed the CTQ list.
The project team confirmed and analyzed the key factors by using tools such as gear box disassembly and tolerance analysis, and optimized the axial clearance of X gear according to the analysis results.
& lt3> Project Optimization Stage:
The optimal design object locked in the design stage is optimized, the nominal size of the main X tooth is adjusted by X mm, and the size of the spring hole is changed. Three gearboxes were installed and three boxes were installed for verification. The results of trial installation and verification show that the movement of shift lever meets the requirements.
& lt4> project verification stage:
20 vehicles were installed and verified in small batches. The verification results show that the shift lever movement meets the design requirements, the shift lever movement data should be tracked for a long time, and the drawings should be solidified.
Third, the project experience:
1. As a development engineer, I thought the quality of products was the focus and content of the quality department, but now I realize that product quality management is something that everyone in the company has to face every day.
Mission.
In the past, most problems were solved by our own experience. However, Six Sigma is solved by scientific methods, such as fishbone diagram, VOC, CTQ, QFD house of quality, FMEA, etc., which makes it easier to find problems and optimize the mobile problem.
3. Through the study of six green belts suitable for horses, the project team members are exposed to a brand-new technical method and way of thinking, hoping to bring scientific and accurate analysis and judgment in the future work.
Fourthly, Zhang Chi Consulting began to focus on DFSS design for Six Sigma from 16, and developed innovative products and processes based on market research and demand analysis; It is an innovative concept: emphasizing the robustness of products and processes and paying attention to problem prevention; It is a systematic project: through the system methodology (I-D-D-O-V), the voice of customers is transformed into engineering requirements, and the influencing factors on customers and the relationship between them are optimized, so as to achieve and maintain a high quality level. Its purpose is to develop high-quality innovative products with successful technology and business at the lowest cost in the shortest time.
Provide six sigma open class training and project consultation. (Six Sigma, Lean Six Sigma, design for six sigma)
1. Six Sigma training is divided into: green belt, black belt and green belt and black belt.
2. The training cost of Zhang Chi Liusima open class is between 8,000 and 40,000 yuan. There are fixed courses every month.
3. There are three training methods: open class, internal training and consulting (project counseling).