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

"Cold heading mold for special slender bolts?"

He looked at Guo Yonghe in shock, "Xiao Guo, are you planning to use cold heading technology to produce special slender bolts?"

Generally speaking, there are three commonly used methods for producing bolts, namely turning, hot heading and cold heading.

For example, the current method of producing special slender bolts in the metalworking workshop of the internal parts factory is to use a lathe to directly cut the raw materials into finished products. Usually, there is no need to use molds.

The remaining two production methods are to put the raw materials into the molds of hot heading machines and cold heading machines, apply external force to the raw materials, and let the raw materials be extruded in the molds.

The difference between the cold heading process and the hot heading process is that the mold used by 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 drawing is closed, so it is natural that he intends to adopt the cold heading process.

"good!"

Guo Yonghe nodded and said: "I do plan to use cold heading technology to produce special slender bolts."

"Xiao Guo, are you being hasty?"

Zhai Yuqiang shook his head and said: "Do you think the factory has not considered using cold heading technology to produce special slender bolts? The factory has also undergone many tests, and all data results have proven that the cold heading technology is not suitable for processing and production at all.

This special slender bolt.

“There are only two methods suitable for processing this special slender bolt, and that is the hot heading process and the turning process.

"If we adopt the hot heading process, not only will we need to carry out large-scale modifications to the existing equipment in our factory, but there will also be a relatively large gap between production efficiency and finished product qualification rate compared with the turning process.

"So after repeated weighing, the factory finally decided to use turning to process this special slender bolt!"

It turns out that the factory has experimented with two other processing techniques?

Guo Yonghe nodded slightly.

The production process of this special slender bolt was finalized more than nine years ago, and it was less than two years since he worked in the internal assembly plant. It was not surprising that he did not know the inside story at the time.

"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 specific reasons, but there are two main reasons why the factory finally decided to abandon the cold heading process."

Zhai Yuqiang, as the programmer who proposed the turning process to process 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 Wujiao Chemical Company requires that this special slender bolt must be made of high-grade chromium-molybdenum nitride alloy steel. However, the raw material of high-grade chromium-molybdenum nitride alloy steel has an unusual and significant

The characteristic is that the surface of the material is decarburized. After testing, the depth of unilateral decarburization is directly between 0.3 mm and 0.5 mm.

“In this case, special slender bolts that are cold-forged directly from high-grade chromium-molybdenum nitride alloy steel will have major product defects. Neither the tensile strength nor the corrosion resistance of the product can reach the five-dimensional level.

The quality standards required by the company.

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

"However, after the factory tested the existing phosphating agents and lubricants on the market, it was found that the effects when used on high-grade chromium-molybdenum nitrided alloy steel were not very good. This not only reduced the qualification rate of cold heading finished products, but also It also greatly reduces the service life of the cold heading mold, greatly reducing the cost advantage of the cold heading process.

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

“So that’s how it is!”

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

Speaking of which, we really can’t blame Zhai Yuqiang. Whether it is his 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. How can he compare with him who has been in the industry for thirty years? The double cheater who traveled through time later has the technology and experience to defeat this era.

"Chief Zhai, actually the two problems you mentioned are not difficult to solve."

Guo Yonghe smiled and pointed at the data on the process flow chart drawn by Zhai Yuqiang with his hand, and said to Zhai Yuqiang: "Look, the maximum diameter of the stem of this special slender bolt product is 7.0 mm. In order to prevent the use of cold heading The decarburization of the product surface caused by the process reduces the tensile strength and corrosion resistance of the product, but we actually have a lot to do!”

Having said this, he pointed to a place on the mold drawing he had drawn, and asked Zhai Yuqiang to lower his head and look at it: "Chief Zhai, look at it, actually we only need to put a small ejector pin inside the big ejector pin of the female mold. , in this way, the high-grade chromium-molybdenum nitride alloy steel bar with a diameter of 6.5 mm can be upsetting first to 7.5 mm, and then through the reciprocating movement of the large ejector pin of the female mold in the small copper sleeve, the high-grade chromium-molybdenum nitride alloy steel can be The rod is then upset and extruded to 7.0 mm.

"After these two upsetting processes, the surface decarburization of the high-grade chromium-molybdenum nitride alloy steel material can be effectively eliminated, ensuring the quality of the special slender bolts processed!"

"What? Can it still be done like this? Comrade Xiao Guo, have you ever tested this processing technology in actual work?"

This is the first time Zhai Yuqiang has heard of such a cold heading process. After thinking about it carefully, it makes sense in theory. In the process of upsetting high-grade chromium-molybdenum nitride alloy steel materials into rough and fine parts, high-grade chromium The carbon-rich part inside the molybdenum nitride alloy steel material is mixed with the surface decarburization layer through upsetting and extrusion, effectively eliminating the defects of surface decarburization of the product.

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

Of course Guo Yonghe had tried it in actual work, but it was when he was working in eastern Guangdong in his previous life.

Naturally, he couldn't tell the truth at this time, so he could only move the Huaxia No. 1 Tow Factory out again and take the blame:

"Chief Zhai, although I have not tested it in actual work, when I went to Luo City last time, I heard from the technicians of Huaxia Yituo Factory that they had tested it in their factory."

In fact, it is not unjust for China YTO Factory to take the blame. After all, when Guo Yonghe attended a senior technician training class in eastern Guangdong Province, there was a teacher who was a senior technician of China YTO Factory, and Guo Yonghe learned from this teacher. A lot of technology and experience have been gained - such as the solution to the oil absorption problem of the 75-type air filter.

"So it turns out that Huaxia Yituo Factory has already tested it? That's no wonder!"

Zhai Yuqiang nodded, no longer having any objections.

As the chief of the biotechnology department of a deputy department-level enterprise, Zhai Yuqiang has always had a natural admiration for Huaxia Yituo Factory, a huge ministerial-level enterprise. Since Huaxia Yituo Factory has done experiments and proved that there are no problems, he

Is there any doubt at all?

"What about phosphating agents and lubricants? How should we solve them?"

Zhai Yuqiang asked the next question.

For him, if the problems of phosphating agent and lubricant are not solved, the special slender bolts produced by the cold heading process will not only have a low qualified product rate, but also cause the production cost of special slender bolts to be high due to severe mold loss.

If it remains high, it is very likely that the final product cost will be similar to the special slender bolts produced by the current turning process.

In this case, Guo Yonghe will still lose money even if he uses cold heading technology to produce special slender bolts at the labor service company.

"The phosphating problem is also easy to solve."

Guo Yonghe was confident and replied with a smile: "In view of the special properties of high-grade chromium-molybdenum nitride alloy steel, do not use a single phosphating agent, but use a zinc-based phosphating solution, an iron-based phosphating solution, and a manganese-based phosphating solution.

Liquid and nickel-based phosphating liquids and other phosphating liquids are mixed together to form zinc, iron, calcium, nickel, manganese and other composite phosphating liquids for phosphating, which can achieve very ideal results.

"As for lubricants, our provincial capital Zhongtian Chemical Engineering produces a molybdenum disulfide lubricant, and by adding a certain proportion of engine oil, it can perfectly solve the lubrication problem of high-grade chromium-molybdenum nitride alloy steel during cold heading processing.

!”

Zhai Yuqiang opened his mouth, unable to say anything.

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

Guo Yonghe not only showed great talent potential in improving the manufacturing plan of the 75-type air filter, but the talent in cold heading technology displayed in front of him is even more unfathomable.

There are many things that Zhai Yuqiang would never think about in his entire life if they hadn't come from Guo Yonghe's mouth!

I can't blame Guo Yonghe for saying that the production process of special slender bolts he formulated involves huge waste of material costs and human resources.

Apart from anything else, how much consumption of raw materials will be reduced simply by changing the raw material for producing 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 for a long time and finally decided to ask the last question in his heart.

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

"I can't say anything else."

Guo Yonghe said with a smile: "But the cost of raw materials is easy to judge. Each time the new cold heading process produces a special slender bolt, it consumes 0.07 kilograms less of high-grade chromium-molybdenum nitride alloy steel than the old turning process. According to the high-grade chromium

The current market price of molybdenum nitride alloy steel is about 6 yuan per kilogram, so the material cost of each special slender bolt can be saved at least 42 cents!"

Save 42 cents?

Zhai Yuqiang quickly calculated in his mind.

The current production cost of special slender bolts in the in-house assembly plant is 86 cents per piece. If you save 40 cents, the production cost can be reduced to 44 cents.

The purchase price given by Wujiao Chemical Company is 75 cents per bolt. In other words, if Guo Yonghe adopts the new cold heading process to produce this special slender bolt, each bolt will have a huge gross profit margin of almost 41 cents.

!

I can't blame Guo Yonghe for daring to boast in front of Luo Daojun that not only must he ensure the normal payment of wages to all employees of the labor service company, but he must also pay a management fee of 4,000 yuan to the factory every month!

Is there any fucking reason for this?
Chapter completed!