At the work site, we began to publicize the "three noes principles" of on-site quality management very early, and have been publicizing such ideas and requirements. But for a long time, it still stays on the understanding and slogan of "three noes" We have been exploring how to carry out better practice. In the process of promoting field improvement recently, we have made some progress, gained some experience and summarized it.

This is a sentence that is literally easy to understand, and there are three main points.

People usually focus on "not accepting", "not manufacturing" and "not delivering". In fact, the first thing to focus on is "defective products".

"Defective products" refer to products that do not meet the inspection specifications and standards.

We produce and analyze defective products every day, and we think we have identified and recorded all kinds of bad phenomena.

Is that really the case? We can see that there are many defective products at the scene. After on-site repair by the operator, the number of defective parts shall not be counted, and the defective parts shall not be counted. For example, the surface of the product is dirty (finger covers, etc.). ) and remove the solder balls on the PCB. These did not enter the bad report, and the operators did not give feedback. But these are not good, because it affects production efficiency and one-time pass rate.

This definition is broader than the original definition, and it also needs our on-site observation and identification.

When we need to promote the "three noes", the first challenge comes from the field management. Because we all know that the defects on our site can never be "zero defects". If this principle is implemented, production will inevitably be impossible and when to stop production is uncertain.

In our cognition, "three noes" = "zero defect" = impossible!

This is also the fundamental reason why it is difficult for us to implement the "three noes".

In fact, "three noes" and "zero defects"!

Why do you define it like this? Because we need to classify and identify the causes of defective products.

The definition of defective products has been explained above, but the causes of defective products need to be classified.

We need to divide the causes of defective products into systematic defective products and unsystematic defective products;

This kind of defective products include: foreign body attached to polarizer, foreign body assembled, foreign body pressed by IC, etc.

This kind of defective products include: missing stickers, easy tearing (missing process), crooked stickers, crooked code spraying, etc.

System defect product is a system engineering, which needs system perfection, involving many factors such as 4m1e.

For example, according to our statistics, the average defect rate of foreign bodies in patches is about 65,438+0.5%. Then, on the premise that the equipment debugging is stable, the polarizer cleaning is normal, and the LCD cleaning balance is OK, the defective product of 8000pcs per day is about 120 PCs. According to the calculation of 10 hour per day, the defective products are randomly 12 pieces per hour. There should be fewer cases where there are more than five defects in a row. If it is distributed according to the above data in the production process, it means that the defective products are existing systematic defective products. If the patch hair/foreign body appears more than 5pcs continuously, it is considered that there is a non-systematic defect. The "three noes" immediate response needs to be started immediately, and the operators need to report the abnormal situation immediately.

Non-systematic defective products are caused by the change of a certain factor, and the improvement goal of these defective products needs to be based on "zero defects".

For example, the sudden appearance of flaky foreign bodies in the above example may be caused by the unclean surface state of polarizer. Another example: the patch is crooked. When the equipment debugging is OK and the production is stable, there is no sticking deviation (that is, zero defect). If 1pcs appears, it belongs to non-system defective products, and it is necessary to immediately feedback whether there are unstable factors in the equipment.

For example, QC needs to clean solder beads on PCB. According to analysis, the root cause is that solder beads fall on PCB during welding. By increasing the protection of silica gel sheet, solder beads are prevented from falling on PCB.

All management behaviors need to be implemented eventually.

Searching for "three noes" on Baidu, there are 10 summary points of "three noes":/view/bac5fa0631b765ce04081456.html #

According to our current implementation experience, I don't agree with all the terms 10.

According to the summary of our current practice, we should distinguish and promote according to the following responsibilities;

Through the implementation of the "three noes" principle, the one-time pass rate has been improved, and the problems such as missing items that were originally thought to be impossible to eliminate have reached single digits. Moreover, the feedback from employees is getting easier and easier, the pressure of QC inspection is getting smaller and smaller, the number of QC personnel is also decreasing, and the process of continuous optimization continues.

Changing the understanding of "three noes" is the key to promote change and progress. This change provides a way to distinguish between "three non-principles" and "zero defects" and a way to distinguish defective products from systematic defects and non-systematic defects;

Promoting the "three noes" principle is a systematic process and cannot be adopted in a one-size-fits-all manner. Every product and project needs continuous improvement.

The promotion of the "three noes" principle needs to fully mobilize the participation of all personnel, each of whom bears different responsibilities, and * * * will succeed together!