As a veteran machining expert with nearly 20 years of experience, Zhai Yuqiang only glanced at Guo Yonghe's mold drawings and immediately found the clue:

"Cold heading dies for special slender bolts?"

He looked at Guo Yonghe in shock, "Xiao Guo, are you planning to adopt the cold heading process to produce special slender bolts?" ”

Generally speaking, there are three commonly used ways to produce bolts, namely turning, hot heading, and cold heading.

For example, the metalworking workshop of the internal assembly factory currently produces special slender bolts, which is to use lathes to directly cut raw materials into finished products, and usually do not need to use molds.

The other two production methods are to put the raw materials into the mold of the hot heading machine and the cold heading machine, and apply external force to the raw materials to make the raw materials extruded in the mold.

The difference between the cold heading process and the hot heading process is that the mold used in the cold heading machine is a closed mold process, while the mold of the hot heading machine is generally open.

The mold drawn on Guo Yonghe's drawings is closed, so he naturally intends to adopt the cold heading process.

"Not bad!"

Guo Yonghe nodded and said, "I do plan to use the cold heading process to produce special slender bolts. ”

"Xiao Guo, are you hasty?"

Zhai Yuqiang shook his head and said: "Do you think that the factory has not considered the cold heading process to produce this special slender bolt?" The factory has also undergone many tests, and all the data have proved that the cold heading process is not suitable for the processing and production of this special slender bolt.

"There are only two ways to machine this particular slender bolt: hot heading and turning.

"If the hot heading process is adopted, it is not only necessary to carry out large-scale transformation of the existing equipment of our factory, but also there is a relatively large gap between the production efficiency and the qualified rate of finished products and the turning process.

"So after repeated trade-offs, the factory finally decided to adopt a turning method to process this special slender bolt!"

It turns out that the factory has tried the other two processing processes?

Guo Yonghe nodded slightly.

The production process of this special slender bolt was finalized more than nine years ago, and it is not surprising that he has been working in the internal assembly factory for less than two years, so he does not know the inside story of the beginning.

"Section Chief Zhai,"

He asked: "You said that the cold heading process is not suitable for processing this special slender bolt, what are the specific reasons?" ”

"There are many reasons for this, but there are two main reasons why the factory finally decided to abandon the cold heading process."

Zhai Yuqiang, as the planner who proposed the turning process to process and make special slender bolts more than nine years ago, naturally had a very clear grasp of the original situation, he said:

"The first reason is that Wujiaohua Company requires that this special slender bolt material must be made of high-grade chromium-molybdenum nitride alloy steel, and the raw material of high-grade chromium-molybdenum nitride alloy steel has an unusually significant feature, that is, the surface of the material is decarburized, and after testing, the unilateral decarburization depth is 0.3 mm to 0.5 mm directly.

"In this case, the special slender bolts directly upset with high-grade chromium-molybdenum nitriding alloy steel will have major product defects, and neither the tensile strength nor the corrosion resistance of the product can meet the quality standards required by Wujiaohua.

"The second reason is that the cold heading process requires phosphating on the surface of the raw material before processing, and adding lubricant before cold heading to ensure the smooth molding of the product.

However, after the test of the existing phosphating agent and lubricant on the market, it was found that the effect of using high-grade chromium-molybdenum nitriding alloy steel is not very good, which not only reduces the qualified rate of cold heading products, but also greatly reduces the service life of cold heading molds, so that the advantages of cold heading process in terms of cost are greatly reduced.

"It is precisely because of the above two significant shortcomings that the factory finally had to abandon the cold heading process and finally decided to adopt the turning process scheme to produce special slender bolts!"

"I see!"

Guo Yonghe nodded, this was the first time he knew the inside story of the internal assembly factory's final decision to adopt the current turning process scheme to produce this special slender bolt.

Speaking of which, Zhai Yuqiang really can't be blamed, whether it is the understanding of the cold heading process or the choice of phosphating dosage and lubricant, Zhai Yuqiang has to be limited by the limitations of the times, where can he compare to his double hanging force that has crossed over from 30 years later, and has the technology and experience that can beat this era.

"Section Chief Zhai, in fact, the two problems you mentioned are not difficult to solve."

Guo Yonghe smiled and first clicked the data on the process flow chart drawn by Zhai Yuqiang, and said to Zhai Yuqiang: "You see, the maximum diameter of the rod of this special slender bolt product is 7.0 mm, in order to prevent the decarburization of the product surface caused by the cold heading process and reduce the tensile strength and corrosion resistance of the product, we actually have a lot to do!" ”

Speaking of this, he pointed to a place on the mold drawing he had drawn, and asked Zhai Yuqiang to look down: "Section Chief Zhai, come and see, in fact, we only need to set a small ejector rod in this large ejector rod of the female mold, so that the high-grade chromium-molybdenum nitride alloy steel bar with a diameter of 6.5 mm can be upset to 7.5 mm first, and then the high-grade chromium-molybdenum nitride alloy steel bar will be upset into 7.0 mm through the reciprocating motion of the large ejector rod of the negative mold in the small copper sleeve."

"After these two upsetting and extrusion processing, the surface decarburization of high-grade chromium-molybdenum nitriding alloy steel materials can be effectively eliminated, and the quality of the processed special slender bolts can be guaranteed!"

"What? Can you still do this? Comrade Xiao Guo, have you tried this treatment process in actual work? ”

Zhai Yuqiang is the first time to hear about such a cold heading processing process, think about it carefully, it does make sense in the truth, in the process of upsetting the high-grade chromium-molybdenum nitride alloy steel material coarse and fine, the carbon-rich part of the high-grade chromium-molybdenum nitride alloy steel material is mixed with the surface decarburization layer through upsetting, which effectively eliminates the defects of decarburization on the surface of the product.

However, the actual effect must also be judged by the experimental data in reality, and cannot be judged based on theory alone.

Of course, Guo Yonghe experimented in actual work, but it was when he worked in eastern Guangdong in his last life.

At this time, he naturally couldn't tell the truth, so he could only move Huaxia Yituo Factory out again:

"Section Chief Zhai, although I haven't tested it in actual work, but the last time I went to Los Angeles, I heard the technicians of Huaxia Yituo Factory say that they had tested it in the factory."

In fact, it is not unjust for Huaxia Yituo Factory to carry this pot. After all, when Guo Yonghe participated in the senior technician training course in eastern Guangdong Province, there was a teacher who was a senior technician in Huaxia Yituo Factory, and Guo Yonghe learned a lot of technology and experience from this teacher - such as the solution to the oil absorption problem of the 75 air filter.

"It turns out that Huaxia No. 1 Tractor Factory has already tried it? Then it's no wonder! ”

Zhai Yuqiang nodded, no longer having any objections.

As a deputy director-level enterprise biotechnology section chief, Zhai Yuqiang has always had a natural sense of admiration for the Huaxia No. 1 Tractor Factory, a huge ministerial-level enterprise, since the Huaxia No. 1 Tractor Factory has done experiments to prove that there is no problem, he will have the slightest doubt?

"What about phosphating agents and lubricants, and how to solve them?"

Zhai Yuqiang asked the next question.

For him, if the problem of phosphating agent and lubricant is not solved, the special slender bolts produced by the cold heading process not only have a low qualified product rate, but also cause the production cost of special slender bolts to remain high due to serious mold loss, and it is likely that the final product cost is similar to the special slender bolts produced by the current turning process.

In this case, Guo Yonghe would still lose money even if the labor service company used the cold heading process to produce special slender bolts.

"The phosphating problem is also very easy to solve."

Guo Yonghe was confident and replied with a smile: "In view of the special properties of high-grade chromium-molybdenum nitriding alloy steel, do not take a single phosphating agent, but take a zinc-based phosphating solution, iron-based phosphating solution, manganese phosphating solution and nickel-based phosphating solution and other phosphating solutions mixed together to produce zinc, iron, calcium, nickel, manganese and other composite phosphating solutions for phosphating, which can achieve very ideal results."

"As for the lubricant, our provincial city Zhonghua project produces a kind of molybdenum disulfide lubricant, and then adds a certain proportion of oil, which can perfectly solve the lubrication problem of high-grade chromium-molybdenum nitride alloy steel in cold heading processing!"

Zhai Yuqiang opened his mouth and couldn't say anything.

Only then did he know that he was not wronged when he faced Guo Yonghe at the celebration banquet yesterday.

Guo Yonghe has not only shown great talent potential in improving the manufacturing scheme of the Type 75 air filter, but also has an unfathomable talent in the cold heading process that he is now showing in front of him.

There are a lot of things, if it weren't for Guo Yonghe's mouth, he Zhai Yuqiang probably wouldn't have thought in any direction for the rest of his life!

Guo Yonghe dared to say that there was a huge waste of material costs and human resources in the production process of special slender bolts he formulated.

Not to mention, how much will the consumption of raw materials be reduced by changing the raw materials for the production of special slender bolts from high-grade chromium-molybdenum nitride alloy steel with a diameter of 11 mm to high-grade chromium-molybdenum nitride alloy steel with a diameter of 6.5 mm?

"Comrade Xiao Guo,"

Zhai Yuqiang thought about it for a long time, and finally decided to ask the last question in his heart.

"How much do you think the cost per unit of the final product can be reduced if the cold heading process you designed to produce this special slender bolt can be used?"

"I can't say anything else."

Guo Yonghe said with a smile: "But the cost of raw materials is very good to judge, the new cold heading process produces a special slender bolt, than the old turning process to consume 0.07 kg of high-grade chromium-molybdenum nitride alloy steel, according to the current market price of high-grade chromium-molybdenum nitriding alloy steel is about 6 yuan a kilogram, then the cost of each special slender bolt can save at least four cents!" ”

Save four cents two?

Zhai Yuqiang quickly mentally calculated.

The current production cost of special slender bolts in the internal assembly plant is eight cents and six pieces, saving four cents and two, so the production cost can be reduced to four cents and four.

The purchase price given by Wujiaohua Company is a seven cents five, that is to say, if Guo Yonghe adopts the new cold heading process to produce this special slender bolt, each one has a huge gross profit space of almost four cents!

Guo Yonghe dared to boast about Haikou in front of Luo Daojun, not only to ensure the normal payment of wages to all employees of the labor service company, but also to pay a management fee of 4,000 yuan to the factory every month!

Is there any fucking reason for this!