Chapter 366 Is the threshold high? Good thing!
The popularity of Shen City increased in later generations, but the area of the entire city was actually not large.
Not to mention that there are still terms inside and outside Guan, even if it is Shencheng in later generations, the city area is not on the same level as the capital, Shanghai and Yangcheng.
Shenzhen University and BMW Group are both in the same area. Wuling Zhiguang entered Shenzhen University in less than ten minutes.
Lai Yongfeng took the person to the office building of the School of Mechanical and Vehicle Engineering with ease and successfully found Liu Yushu.
Although the two of them are classmates, Liu Yushu's clothes are obviously much more fashionable.
Wearing a decent suit and a pair of gold-rimmed glasses, the whole person still has a strong academic atmosphere.
Lai Yongfeng quickly introduced the two of them, and then went directly to the topic.
He knew that Jiang Hui was busy with time, and he also knew that Liu Yushu had eaten bread abroad for so many years and didn't like to beat around the bush.
"Professor Liu, the hot stamping process you are currently studying is to use water channels in the mold for quenching, or is it to spray water directly into the mold for quenching?"
Jiang Hui's words directly made Liu Yushu feel professional.
Anyone who has not studied technology in this field cannot ask such a question.
In particular, water channels are machined into the mold for quenching. This approach has never been tried by any company before.
This technology is also an important achievement that Liu Yushu was deeply involved in. It is one of the core technologies of hot stamping technology.
"Director Jiang, you got to the key point with this question right away."
"According to our current design plan, after the steel plate is processed into the required pieces on the blanking machine, it is transferred to the heating furnace for heating."
"Judging from the performance of the metallographic structure of the steel plate, the austenitic steel plate is relatively soft and is very suitable for forming."
"The steel plate in martensite state is very strong and has very good collision performance, but it is difficult to process easily."
"After we use a special steel plate to heat, the metallographic structure will become mainly austenite, and then transfer it to the mold for processing."
"Immediately after forming, water is injected into the mold water channel for quenching treatment, so that the metallographic structure of the steel plate is transformed from austenite-based state to a martensite-based state, and the strength is greatly improved immediately."
"The original tensile strength of steel plates is only more than 200 MPa. After being processed through the hot stamping process, the strength will be increased to more than 1,000 MPa, achieving a leap-forward change."
When it came to professional matters, Liu Yushu suddenly became excited.
It is difficult to find someone to communicate with in China about the things he studies.
Lines are separated like mountains, and this situation is particularly serious in the field of scientific research.
For example, if experts who also study physics have different research directions, they may not even be able to understand each other's papers, let alone communicate in depth.
The chassis design that Lai Yongfeng focuses on is not very different from the body steel plate forming and other technologies that Liu Yushu focuses on. We can talk about it to some extent, but it is just a chat.
Unless Lai Yongfeng has time to conduct in-depth research on the hot stamping process, the two of them can communicate comfortably.
Now he finally met someone who seemed to have done some research in this area, and Liu Yushu became interested in talking.
"After the hot stamping process, the strength of the steel plate becomes more than 1,000 MPa. At this time, it will be very difficult to process the parts again, right?"
"Our parts are only molded once in the mold. It is estimated that there is no way to use the parts directly on the car. The parts need to be trimmed, right?"
When it comes to professional skills, Jiang Hui never underestimates anyone.
Even if Liu Yushu is an expert in this field, the depth of his research may be deeper than Jiang Hui, but the breadth is definitely not as good as Jiang Hui.
"Yes, this is indeed a problem. Currently, Saab Automobile has introduced laser cutting machines to trim and drill parts."
"In front of laser, no matter how high the intensity is, it doesn't matter."
Liu Yushu had stayed at Saab Automobile for several years before returning to China, and he was more familiar with the processing technology of hot stamping parts used on Saab9000 than anyone else.
"The current laser processing equipment technology also needs to be further improved. Whether it is the speed or accuracy of laser processing, it may not be able to fully meet the demand."
“The most important thing is that the selling price of such laser cutting equipment should be very high, and these costs must be amortized to the processing cost of the parts, and ultimately reflected in the selling price.”
“The hot stamped steel plate itself is quite special, and the price is more expensive than ordinary automobile steel plates.”
"The processing requires heating and special quenching treatment, so the processing efficiency should be relatively low."
"In addition, the mold design of hot stamping parts must be very complicated, and the processing cost and processing technology are very high."
"The final parts cost should be more than ten times the original cost of traditional cold stamping parts, right?"
Jiang Hui directly pointed out the biggest problem with current hot stamping technology.
This problem was basically solved relatively well after 2010.
Before this, the cost of hot stamping parts was too high, promotion was too difficult, and the process was not particularly mature.
That is to say, it is a relatively niche high-end model like Saab, so I dare to try it out.
After all, compared to BMW and Mercedes, Saab is much less well-known, but the company's positioning is luxury cars.
If we don’t come up with something innovative, it will be difficult to do publicity work.
"Director Jiang, what you said is correct. The current hot stamping process is indeed not mature enough. At present, only Saab Automobile has used two parts on a trial basis in cars. There is still some time before it can be popularized on a large scale. There is a way to go.”
"However, after this technology matures, it will have great application prospects in the automotive industry. I am very convinced of this."
Liu Yushu also realized that he wanted to study this technology well at Shenzhen University, and the support and cooperation from BMW Group was essential.
So he was afraid that Jiang Hui would lose confidence in this technology.
"My point of view is completely consistent with yours."
"The use of hot stamping technology on cars can greatly improve the strength of the car body, allowing the car to maximize the safety of passengers in the car in the event of a collision."
"The BMW Group is preparing to apply this technology to the Land Rover brand's first off-road vehicle, making this off-road vehicle the vehicle with the best crash performance in the world."
"But what are the difficulties in achieving this goal? I would also like to hear your thoughts."
The upcoming new model development schedule is very tight, and Jiang Hui naturally hopes that Liu Yushu will personally participate.
Otherwise, if he had to personally lead his team to study everything, he would be too busy at all.
"When is the Land Rover brand off-road vehicle expected to be launched?"
Before answering the question, Liu Yushu felt it was necessary to find out how long Jiang Hui had left for him. Although he already had experience in the application and promotion of hot stamping molded parts at Saab Automobile, judging from Jiang Hui's words, it is obvious that this time it is not a symbolic use of one or two parts, but a large-scale preparation. use.
The technical difficulty behind this is not just one or two points.
Not to mention other things, the construction of the production line for the hot stamping process alone is a big problem.
"We will go on sale as soon as the end of next year, and as late as the first half of the next year."
Jiang Hui didn't say anything. After all, the time was too short, and it was hard to say whether it would be possible.
"To produce hot stamping parts, there are several key issues that must be solved."
Feeling the urgency of time, Liu Yushu was ready to explain all the situations clearly to Jiang Hui.
In case the schedule was not met, Jiang Hui still felt that it was due to his lack of skills.
"The first one is raw materials. We need to find steel manufacturers to produce special hot stamped steel plates, and we need to work with them to develop this kind of steel plates."
"Otherwise, using ordinary steel plates for processing would not be able to achieve such effects."
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"The second is the purchase and installation of the heating furnace. The best way is to use a large heating furnace dozens of meters long for processing, but such a furnace requires a lot of investment and the process control is very complicated."
"Considering that this is our first attempt and time is very tight, the first production line can be heated using a box furnace, which can significantly save time and investment costs."
"Then there is the purchase of presses, which will also be a new problem."
"Unless we import from Europe, there will definitely be no press directly produced by any domestic equipment factory that can be used in our production line."
"During the hot stamping process, the mold has a pressure holding process of more than ten to twenty seconds, which requires a special control method for the press."
Liu Yushu said while observing Jiang Hui's reaction to see if he could keep up with his own rhythm.
This kind of in-depth technical discussion is difficult to understand for people who don't understand the technology.
Fortunately, the feedback Jiang Hui gave him was very satisfying.
"The third is the processing of hot stamping dies, which is very different from traditional cold stamping dies, and the difficulty is not at all the same order of magnitude."
"At Saab Automobile, the supplier directly purchased the most advanced machine tool products in Europe. It is said to be a high-precision five-axis CNC machine tool that can be used to process nuclear submarine propellers, and the mold was successfully processed."
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"Especially the water channel in the mold, the processing depth is very deep, which cannot be satisfied by ordinary machine tools, and the requirements for the cutting tools are also very high."
"This is actually the part that worries me the most."
Although Liu Yushu has not been in China for many years, he still has a general understanding of the domestic industrial level.
He has no confidence that China can produce hot stamping molds that are even difficult to process in Europe.
Even if it is processed, the time and cost required are still unknown.
"I will personally participate in solving this problem and ask Nanshan Equipment to design a special machine tool for the processing of hot stamping molds."
Jiang Hui naturally knew that Liu Yushu's worries were justified.
It is not simple at all to process a simple set of molds.
If you don't pay attention to any part, the accuracy of the final parts will not meet the requirements.
After thermoforming, the strength of the parts is too high. If the accuracy is not good enough, they will basically be scrapped.
You can't change it even if you want to.
"If the processing problems of the mold and the material and equipment problems just mentioned can be solved, then I think it is completely feasible for hot stamping parts to be used on Land Rover off-road vehicles."
"It's just that the time is too tight. We have fully calculated, that is, less than two years. Even taking into account the trial production schedule of parts, we actually only have more than a year."
Liu Yushu was not used to the sudden change in the pace of work clothes.
In Europe, everyone's work pace is generally slow, and it will definitely take four or five years to develop a model.
Where can a BMW be put on the market like this?
"Ten thousand years is too long, just seize the day."
"Our Chinese automobile industry lags far behind the world level. If we develop step by step, we will never catch up with others."
“So it is necessary to hurry up and find some ways to overtake in corners.”
"Using hot stamping parts on a large scale in advance is one of the ways we can achieve overtaking in corners."
Jiang Hui would not directly change the production schedule of the Land Rover off-road vehicle because of Liu Yushu's concerns.
This is simply impossible.
However, there are indeed many barriers to large-scale production of hot stamping parts.
These problems basically require your own personal participation to hope for a quick solution.
However, as a uniquely selected technological breakthrough solution, it is still worth spending some extra time.
"Director Jiang said it very well. We really cannot develop step by step."
"Don't worry, Lao Liu, our college will definitely fully support your research on hot stamping technology, and the BMW Group will also provide sufficient funds and personnel to assist you in developing related products."
"At that time, we will directly bring a huge surprise to the world and let everyone know that China's automobile industry is also advanced."
After listening dazedly for a long time, Lai Yongfeng finally found a chance to interrupt.
Through the dialogue between Jiang Hui and Liu Yushu, he also realized the threshold of hot stamping technology.
However, sometimes a higher threshold is a good thing.
This means that other OEMs in the world have not yet used it extensively, or even officially considered using it.
In terms of publicity, there is a lot of room for movement, and the effect is likely to be very powerful.
With great effort, everything is possible.
(End of chapter)