Original title: There are also "Engravers" on CNC machine tools with errors accurate to "silk"

"May Day" International Labor Day is a festival to praise labor and pay tribute to workers. Zhang Wei, the winner of the National May Day Labor Medal, is a machining technician of Shandong Fangyuan Group. Over the past 20 years, he has inherited ingenuity, continued to explore and innovate, and solved one technical problem after another.

As a numerical control technician, Zhang Wei's responsibility is to carry out numerical control programming according to the process requirements, and then operate the machine tool to make mechanical parts with errors accurate to "silk".

Zhang Wei, the workshop director and senior technician of Shandong Fangyuan Group Co., Ltd., the winner of the National May Day Labor Medal: Ear eye measurement. For example, if our current size is 80mm and we want to process it to 80.1mm, we can judge whether our size is 80.1mm by observing the iron filings, and then listen to different sounds to represent different situations.

At ordinary times, for parts with tolerance within five wires, Zhang Wei will require two wires, while for the parts he processes, the tolerance is generally within half a wire. Zhang Wei said that this paranoid pursuit of precision stems from a special childhood memory.

Zhang Wei, the workshop director of Shandong Fangyuan Group Co., Ltd., the winner of the National May Day Labor Medal, said that his father was also a farmer, and the tractor was the only means of transportation for him to work in the field. When my father worked with the tractor, he also worshipped his father.

Under the influence of his father, Zhang Wei has been in awe of machines since he was young. When just engaged in numerical control processing, the curved thread reel imported from the workshop needs to be replaced. Although the parts are small, they make everyone difficult - if you buy them, a longer supply period will delay production; If they were made by themselves, the domestic CNC machine tools at that time had no direct manufacturing instructions. When the deadlock came, Zhang Wei took the initiative to stand out. However, he took the equipment manual and studied it for several days, but he could not find a breakthrough. Until one day when I drove home, I found inspiration from the steering wheel.

Zhang Wei, the workshop director and senior technician of Shandong Fangyuan Group Co., Ltd., the winner of the National May Day Labor Medal, said: My hand position is about 45 degrees, which inspired me to divide the whole circle into four segments, complete the decomposition of the entire single turn thread, and complete the processing of the entire drum in an infinite cycle.

The success of this experiment made Zhang Wei realize that to overcome difficulties, he sometimes needs to break the rules. In 2019, Fangyuan Group began to receive manufacturing orders in the aerospace field, which is another huge challenge for Zhang Wei and others.

Liu Changcheng, General Manager of Shandong Fangyuan Group, said that it was very difficult after the docking. Relatively speaking, traditional machinery manufacturing is still far from them.

Zhang Wei, the workshop director and senior technician of Shandong Fangyuan Group Co., Ltd., the winner of the National May Day Labor Medal, said that mistakes are not allowed for aerospace products. If ten thousand products are made, one of them is unqualified, it is considered that the products made are unqualified.

Before it could adapt, the company received the processing order of the world's largest solid carrier rocket "Gravitation I" liquid rocket propellant tank. Zhang Wei and his workmates were stunned when they saw the raw material aviation aluminum.

Zhang Wei, the workshop director of Shandong Fangyuan Group Co., Ltd., the winner of the National May Day Labor Medal, said: It is very soft, and its wall thickness is very thin, just like a piece of paper, which subverts our traditional imagination of machining.

If the aviation aluminum is processed with conventional turning tools, it will cause severe deformation and cannot meet the requirements. When everyone was at a loss, Zhang Wei's team found another way. After more than 30 tests over two days and two nights, they innovated and manufactured a set of automatic tracking tool structure, thus successfully delivering the order.

Over the past 20 years, Zhang Wei has also cultivated a number of senior technicians. Now, Zhang Wei's team is improving the newly developed new aerospace tools.

Zhang Wei, the workshop director of Shandong Fangyuan Group Co., Ltd., the winner of the National May Day Labor Medal, said: "We need to continue to experiment and explore.". It is our goal and dream to let more of our products or our works fly with rockets.