He Tao stood calmly in front of everyone.

"Let me first explain to you what is called a runnerless coagulation mold, that is, in injection molding, the melt in the runner always maintains a hot flow state.

When opening the mold, only the cured product needs to be taken out, and the runner condensate is not generated. Compared with traditional injection molds, this is an advanced injection mold technology, which is a hot direction for the development of plastic injection molding process.

Its biggest feature is that it can improve the utilization rate of materials, reduce production costs, and ensure the forming quality of parts without three-plate molds.

What are the characteristics of this process?

First, the point gate feeding can be used, which simplifies the mold structure and reduces the requirements for the mold opening stroke of the injection machine.

The second is to save raw materials and avoid the process and cost of runner condensate recovery, crushing and reuse.

Third, the melt in the runner is always in a molten state, and the flow resistance is small, which is conducive to the transmission of mold filling and pressure holding, and improves the surface quality and mechanical properties of the product. It can realize multi-point gate, multi-cavity mold and large-scale, thin-walled, long-process molding.

Fourth, there is no time to cool and take out the runner aggregate, shorten the forming cycle, and it is easy to automate production.

Fifth, the pressure loss in the flow channel is small, which reduces the required mold filling pressure, reduces the clamping force of the injection machine, and there is no pouring system coagulation, which reduces the injection amount and can give full play to the capacity of the injection machine.

Sixth, the needle valve gate can be used to control the gate closure time and ensure the molding quality of the product.

The biggest feature of this process is the adiabatic runner, you see my figure, there is no auxiliary heating device in the runner, but the use of the poor thermal conductivity of the plastic, the runner cross-sectional size is designed to be very large, so that the plastic melt close to the surface wall of the runner condenses rapidly due to the low mold temperature, forming a frozen layer, and the melt in the center of the runner maintains molten flow.

The main characteristics of the adiabatic runner are low cost, easy to change materials in production, large diameter of the runner, small pressure loss, and easy to remove when the runner aggregate is frozen.

But there are also shortcomings, because of its large size, prolonging the heating time of plastics, the temperature control is not ideal, not suitable for processing heat-sensitive plastics, to continue to improve, at this stage West Germany is doing this work.

This is a pit nozzle............ This is the ............ of multi-cavity adiabatic runners.

Let's talk about the structure of the hot runner, first of all, the extended nozzle............ Then there is the multi-cavity hot runner injection mold......... There is also the design of the hot runner plate, and the heating form of the hot runner plate .......... ”

He Tao had never lectured before, and he was a little nervous about being a teacher for the first time, but as the content deepened, he became more and more relaxed, this is what he learned, and he also wrote a paper on how to improve the process during his school in West Germany, which was praised by the tutor, isn't it just to tell what I know?

Speaking of later, He Tao has completely let go, commented on many mold technologies in West Germany, and gave very targeted suggestions compared with the domestic manufacturing level.

Liu Lang listened very carefully below, and took notes from time to time, of course, his head is the computer, and it will be stored after listening, so it is for others to see, even I take notes well, how do you do it, needless to say.

Liu Lang is not only He Tao platform, He Tao's content is indeed very useful, the mold is actually the strength of North Industries Group, after all, Liu Lang is there, no matter how complex the mold he can design, but the design is the design, you have to implement the design to the real thing, which is not an easy task.

He Tao said that in some ways to solve this problem, even if the current stage of the North Industries Group is still lacking, because the country's overall technology is not good, most of the materials are not ready, but it also gave Liu Lang a great inspiration, Liu Lang has been inspired, not to mention these workers, this is a very valuable course.

He Tao spoke in great detail, just a variety of cross-sectional drawings as many as a dozen, everyone saw it really, everyone took notes seriously, a full two hours, when He Tao, who was sweating profusely, finished the last word, the scene resounded with warm applause.

He Tao picked up the water cup on the table and took a big sip of water, then waved his hand to everyone and smiled heartily, he knew that the workers' opinion of him had changed.

That's right, the workers have realized that this young man is not not technically inadequate, but low-end technology, and people are mastering higher-end technology.

The warm applause is the greatest trust in He Tao.

"Mr. He said very well, very exciting, let me be greatly inspired, West Germany's technology really deserves its name, don't look at the development of our North Industries Group is good, but compared with foreign advanced enterprises is still far behind, there is a long way to go in the future, even if I have to continue to learn, do not learn can not keep up with the development of the times, compared with foreign advanced enterprises will be bigger and bigger, so we should not be proud, because our company will be the best enterprise in the world in the future, we want to move towards this goal, you know?"

"Yes!"

The crowd shouted.

"In three days, Mr. Juniper will give a lecture to everyone, and then everyone will have to learn about the advanced technology of the United States. ”

The workers' perception of He Tao completely changed, and at the same time they began to look forward to Juniper's course, and it has to be said that the workers of NORINCO Group are very fond of learning, after all, they are very young, unlike some older workers who have lost their momentum.

"He always came back from studying in West Germany, Du always studied in the United States, good guys, we have used the technology of West Germany and the United States, and the development of the enterprise is really promising!"

A worker said happily to a colleague.

"There is also a Mr. Lin, he is studying in the island country, our company is from West Germany, the United States, and the island country, and Mr. Liu, he can do everything, he is proficient in everything, with these people, how can the company not be strong?"

The workers are full of confidence.

Three days later, everyone came to the conference room again, and there were also a lot of drawings on the blackboard, and everyone's eyes lit up, because most of these graphics were bearings.

Now NORINCO is manufacturing bearings, and it seems that this class is very appropriate.

"Ladies and gentlemen, now the company is manufacturing bearings, I am with you these days, I think your level of craftsmanship is very high, to some extent it is comparable to foreign companies, but I also found the problem, that is, in disassembly, The process of installation and cleaning is not formal, and now we have very few types, so this problem has not yet appeared, but once it is produced on a large scale, these informal methods will affect the quality of the product, so today I will tell you how American companies do it in this regard!"

Juniper didn't talk nonsense, he just talked about it.