For the sake of security, the elders’ dormitories are located in the courtyard of the Joint Processing Center. In addition, the equipment of the Joint Processing Center has not yet been used by naturalized migrant workers - to operate this equipment, at least a person with mathematics skills from the Old Time and Space High School is required
Basically, workers who are at best B-diploma holders can’t do anything.
Zhan Wuya's dormitory is a suite, with a small bedroom inside and a living room and studio outside. In fact, it is more used as a conference room. Seniors in the factory often discuss technical issues here. In the middle of the room is Zhang Da
The Eight Immortals table is surrounded by rattan chairs and benches. There is a fitter's workbench against the wall, with a vise fixed on it. There is also a locked tool cabinet - inside are his personal tools.
After the siren sounded at six o'clock in the afternoon, Zhan Wuya first checked the fire protection and safety conditions of the joint processing center workshop and pipe products warehouse, making sure that the power supply had been cut off and all the doors and windows were locked. This is a daily routine. As a manufacturer
The director and director of the General Machinery Factory holds the keys to these two places and is directly responsible. Zhan Wuya knows that there is little danger of being destroyed by force. What he fears most is a safety accident, especially a fire.
Everything was in order, so he asked his female apprentice to go to the Elders' Canteen to buy supper and drinks for the night, and prepare to work late at night so that everyone could continue to work on the problem - the female apprentice was actually his maid. Zhan Wuya felt that he had been living in the factory for a long time, and it was useless.
It's no use having a maid, just stay with me and work as an apprentice. If you can't be a fitter, you can make a lathe or something.
Since everyone hadn't arrived yet, Zhan Wuya took several damaged chains taken from the workshop to the workbench outside, turned on the workbench light and carefully examined the fractures of the chain. He also looked at it with a magnifying glass for a while. He himself
He has a background in heat treatment. Although he doesn't understand metallography, his years of experience have allowed him to figure out some skills in this area. After studying the fracture for several minutes, he felt that it was still a problem with the stress of the material.
After a while, everyone came and looked at the broken link again and again. They discussed how to increase the strength of the chain. It should be said that this time, the General Machinery Factory was very serious about taking down this link in the industrial chain.
Ya personally engaged in heat treatment - a large heat treatment furnace was specially built. The steel obtained from the Ministry of Metallurgical Industry is also the best product that the steel plant can produce.
But the result was still unsatisfactory. Everyone looked at the large number of chains over and over again, adding a few words of discussion from time to time. Liang Xin took a vernier caliper, measured the chain links one by one, and wrote down the data on a piece of paper.
Sun Li checked the chain section by section to see if there were any scratches... Everyone was busy studying the chain in their hands from all angles. There was no discussion before forming an opinion - there had to be hypotheses.
Based on physical evidence, Zhan Wuya's female apprentice added tea to them, helped light fires from time to time, and emptied the full ashtrays.
By midnight, everyone finally came up with a unified technical analysis conclusion: the chain is unevenly stressed. The main cause of the problem is manufacturing process problems.
The process flow of chain manufacturing in the Machinery General Plant is to first forge the blank, then anneal to remove stress, then perform cutting, then normalizing and surface treatment, and finally assembly.
"I just checked a lot of chains, and the tolerances are not very ideal. Some are as large as ±0.7mm, and the average is ±0.5mm. The size error is still relatively large. According to GB standards, this size of chain link is the limit.
The tolerance cannot be greater than ±0.4mm. This shows that the prestress problem during the cutting process is more serious than we imagined." Liang Xin said, "A small amount of tolerance accumulates, causing concentrated stress on certain links of the chain and eventually breaking."
Sun Li said: "I think it should be processed first and then heat treated. Even if it consumes a little tool, it will be accounted for - after all, we can always solve the problem of the tool in the future, and it is not a one-time consumable that cannot be replenished after it is used up. In addition,
, forging should be left to the arsenal, where the forging machines are larger than here. In such a high-strength industrial chain, the larger the tonnage of the forging machine, the better."
"We haven't been able to solve the manufacturing of super-hard tools on lathes for a while. I don't know if we can do it before the end of the First Five-year Plan." Zhan Wuya frowned and said. Super-hard tools require alloy steel materials, especially tungsten, cobalt, tantalum and niobium.
And other rare metals - these things have not disappeared anywhere. And alloy steel cutting tools have very high requirements for metallurgy and processing technology. The superhard cutting tools on various machine tools currently used by the Ministry of Machinery Industry completely rely on the old space-time products in stock. Only
Only carbon steel cutting tools made by the machinery factory are used in less demanding processing and cutting.
Zhan Wuya thought again and again: "This is indeed a reason, but lathes all rely on good tools. Now we can't just make a few chains. I can't worry about recklessly consuming tools before mass production of qualified superhard tools."
.I think we should start from three aspects: tolerance control, forging and heat treatment. After cutting, heat treatment is performed to eliminate stress."
The discussion on specific processes and solutions continued until early in the morning, and everyone dispersed after having supper.
Early the next morning, chain production was restarted. After the chain blanks were completed, they were transported to the Bobu Arsenal and forged on the large forging machine in the arsenal - this is the largest tonnage forging machine owned by the Chuan Chuan Group, and all large equipment of the Chuan Chuan Group.
, heavy artillery and ship keels were forged here.
After forging is completed, the chain is transported back to the factory, annealed in a heat treatment furnace, and then cut. However, after cutting, a tempering heat treatment is performed again to eliminate the prestress generated during processing. Then normalizing and surface treatment are performed. Finally
Add thread buckles to assemble into a seamless chain buckle.
"Take it for inspection." Zhan Wuya looked at the completed chain and "do a tensile test."
"I'll host it," Sun Li said.
"Okay, keep strict control! This is our own business, not to fool our customers."
"Of course." Sun Li said, "Let's go to the testing ground!"
Several naturalized technicians who had been studying with the class responded, picked up the chain and walked out. The female apprentice handed Zhan Wuya a large enamel cup of tea and a towel. Zhan Wuya drank it in one breath.
After half a cup, I wiped my sweat again and asked the female apprentice to bring a few bottles of salt soda for everyone.
"Bring me two more packs of cigarettes!"
Several veterans squatted at the door of the heat treatment workshop smoking, waiting for the test results - no smoking is allowed in the workshop. This is a rule set by Zhan Wuya. The female apprentice quickly brought a few small benches. Although it was mainly naturalized migrant workers who took action, a few
A veteran was there to supervise and guide almost every step, and they worked for two days and two nights. Everyone's eyes were red.
After a short time, Sun Li came back with a smile on his face: "Egg! Success!"
Several people cheered and stood up. Zhan Wuya was a little excited and asked again: "How is the test going?"
"We did a tensile test based on the actual working conditions of the dumper, and it passed completely. The tension was increased to 120% before it broke." Sun Li said, "I think we can do a full machine test of the dumper right away!"
"Okay, this time the test has been completed and the process manual has been compiled as soon as possible to start mass production." Zhan Wuya was very excited. Mining chain is an urgently needed product now - large-scale mine development almost all uses mining chain. With manufacturing high-end
The foundation of the strength mining chain will be overcome in the chain production of many industrial equipment in the future.
After the second test was successful, the Machinery General Factory improved the bucket elevator. The first was to install an anti-reversal device with a ratchet mechanism. The bucket elevator is most afraid of power interruption. During the lifting process, one side of the bucket elevator is
There is an ascending hopper filled with materials, and on the other side is a descending empty hopper that has unloaded materials. After the power is interrupted, the elevator will inevitably reverse due to gravity. As the hopper reverses, the materials are unloaded to the bottom of the bucket elevator until they are full.
Stuck. Since reversal is an accelerated movement, it is easy to tear off the hopper, causing damage to the equipment.
Modern bucket elevators are all sealed - the purpose is to reduce the dust flying of materials during the lifting and loading and unloading process. For the purpose of saving materials, the Machinery General Factory initially omitted this shell when designing the elevator, but
During the experiment, everyone felt that it would be better to install it - anyway, an iron shell does not consume much material, but it can greatly reduce dust pollution. Occupational diseases caused by industrial dust are beyond the reach of medical science in this time and space. Besides,
The dust of iron ore is also iron ore, and when it is sintered, it can be used to make steel.
However, new problems arose after installing the iron shell. During the trial operation, it was found that after the sealing, it was difficult to feed and unload the hopper. The hopper was not full and could not be unloaded. Everyone quickly went to the technical archives to look for the design drawings. Two
The following comparison revealed that the workshop director of the sheet metal workshop responsible for manufacturing the sealed shell of the elevator had omitted the suction ducts and vents at the head and bottom of the elevator to save time.
The sealing shell is well made and the sealing is reliable, but it causes a pressure difference during the unloading and feeding process of materials, forming a negative pressure condition in the sealing shell. This results in poor loading and unloading. The vents increase the internal pressure of the elevator.
It is basically equal to the external pressure, and the function of the suction port is to prevent dust from overflowing from the vent through suction, avoiding waste and cleaning the environment.
"Lesson, comrades, this is a profound lesson." Zhan Wuya couldn't help scolding the elders openly, but he still couldn't help but beat this example at the work meeting, "A design for industrial equipment,
Each of these craftsmanship methods is a direct reflection of the experience and lessons accumulated over many years in industrial society. It cannot be changed by anyone who wants to! This kind of loose attitude will cause trouble in industrial production!"