Start with the aviation industry

Chapter 17 This is a batch of urgent mail (it's the third watch again, please support!)

"master!"

From a long distance away, Ma Xiaoli yelled sweetly, and Hu Xiaoxiao also smiled at Lin Feng rarely.

This smile is so beautiful!
Lin Feng said loudly, "Thank you for your breakfast. Whose lunch box is this?"

Ma Xiaoli said, "Master, the lunch box is Xiaoxiao's. We bought the breakfast together. How about it? The taste is not bad."

Lin Feng said with satisfaction, "It tastes good, it's rare to have such a good breakfast, thank you."

This is the truth, usually, Lin Feng's breakfast is relatively simple, go to the cafeteria to buy one or two steamed buns to cope with, and add a bowl of soy milk at most.

Ma Xiaoli said, "Master, do you want us to bring you breakfast tomorrow?"

This, is it not good!

Lin Feng seemed a little hesitant. Of course it would be good for someone to buy breakfast for him, but is it too troublesome for him?

"Well, then bring me another breakfast tomorrow, steamed dumplings with fresh meat and soy milk will do." Lin Feng finally agreed.

Next, Lin Feng began to teach everyone to be familiar with the operation panel, and even Wang Qiang and Song Liu called over together, so another scene appeared. on record.

Wu Weiqing didn't sleep well last night and was under a lot of pressure. He arrived at the workshop production site early this morning with a very clear goal and went straight to the Z35 radial drilling machine.

As soon as he came over, he asked, "How is it, have you passed?"

A driller in his thirties was operating the radial drilling machine, and beside him was a quality inspector, who shook their heads almost simultaneously.

what!
Still ineligible? ? ?

Wu Weiqing's complexion darkened slightly, and the pressure in his heart increased a bit. He even sighed softly, and looked at the main casings of more than a dozen piston six engines placed beside him.

Workshop 406 has three directors, Yan Bing, the top leader, Jiang Haitao, the technical director, and Wu Weiqing, the production director.

The main casing is the key and important part of the six-piston engine, and it is also a part that requires high machining accuracy and requirements. Among them, several positioning holes on the casing have high precision and are difficult to process.

In particular, there are three positioning holes that are not perpendicular to the mounting plane of the receiver, but at a 45-degree angle.

The precision of these three positioning holes is also very high, the diameter tolerance is only 5 wires, and the position tolerance is required to reach 10 wires.

At first glance, such precision is not high in the field of aero-engines, but you must know that this was 1990, and there were not many CNC equipment at all, and it has been processed by ordinary radial drilling machines.

The angle and position mainly depend on the drilling jig, that is, the drilling jig of this processing process. In addition, it must also depend on the technical level of the driller.

The difficulty is so great, and such a critical process is usually processed by the seventh-level driller Yuan Guoliang in the 406 workshop. Looking at the entire 406 workshop, it is estimated that only Yuan Guoliang has such a level.

It was very unfortunate that Yuan Guoliang had a severe stomachache yesterday afternoon. He went to the hospital for an examination and found that he had acute appendicitis.

Last night, I had an appendectomy at the hospital affiliated to Fenghuang Factory. I am still lying on the hospital bed, and I will not be able to leave the hospital in six or seven days.

This batch of parts can't wait for six or seven days!

They are a batch of urgent shipments, and the assembly workshop is waiting for these parts to assemble the six-piston engine. I heard that the aircraft factory has run out of six-piston engines and is also waiting for the engine.

Yuan Guoliang was hospitalized, and the processing of these parts could not be stopped. Wu Weiqing arranged for Liu Ziming, who has more than ten years of drilling experience, to process them.

Knowing the difficulty of this process, no one dared to underestimate it. Tian Mao, the supervisor technician, Jiang Haitao, the technical director of the workshop, and Wu Weiqing, the production director, were all on site to personally check the processing of the first piece.

It's a pity that after the first piece was processed, it was not qualified, neither the hole diameter nor the positional accuracy met the requirements.

With the help of the technician, I adjusted the drilling jig, and it was very late last night, and finally processed another one, which was still unqualified.

After listening to the situation report, Wu Weiqing sighed helplessly.

At this time, Jiang Haitao, Liu Changrong, and Tian Mao, the technician in charge, may be concerned about the processing of these parts.

Wu Weiqing said worriedly, "Lao Jiang, you are still unqualified, what should we do?"

Of course, Jiang Haitao also knew the urgency of these parts. It is no exaggeration to say that the assembly workshop is waiting for the rice to be cooked. If there is a delay of one or two days in the 406 workshop, the high-level management in the factory will probably be alarmed.

Jiang Haitao fell into deep thought, thinking of a solution in his mind, but didn't say anything for the time being.

Tian Mao, the technical engineer in charge, complained, "The design requirements of this part are too high, and the positioning accuracy requires 10 wires, which is basically the limit that the drilling jig can achieve.

Anyone who is engaged in mechanical processing knows that if the position accuracy of each hole is guaranteed by a jig, it is generally 20 wires or 15 wires, and such a jig can generally guarantee the position accuracy.

If the position of 10 wires is required and there is an angle, then the position of each hole cannot be guaranteed [-]% through the drilling jig, and must rely on the technical level of the workers.

Liu Changrong probably agreed with this point, and after thinking for a while, he said, "I suggest repairing the jig, and then try machining another one."

This is actually a little risky. Two pieces are already unqualified. If another piece is still unqualified, what should I do?

Two unqualified parts and three unqualified parts in the same batch are completely different things. Three unqualified parts belong to batch tolerance. The quality control in the aviation industry is very strict. If the batch size exceeds tolerance, the relevant responsible person will be held accountable.

Sure enough, Liu Ziming, the operator, said, "If it still fails, what should I do? I don't want to take this responsibility."

If the batch is out of tolerance, as an operator, he generally cannot escape responsibility, unless Jiang Haitao's level makes a public decision, you can process it at ease, and I will take care of it if there is a problem.

Of course Jiang Haitao would not say such a thing, but shook his head, denying Liu Changrong's proposal, "We have already failed two consecutive items, we can't just do it blindly, we have to think about it carefully."

In the distance, next to the CNC machining center, Lin Feng was explaining some operations on the operation panel to Hu Xiaoxiao and the others, when Wang Qiang reminded him softly.

"Look over there. Director Jiang and Director Wu are all there. Something must have happened."

Lin Feng actually noticed it a long time ago, but just now he has been teaching everyone, explaining some operations on the operation panel, and he didn't pay attention to it.

The things that should be said this morning have been finished, Lin Feng gave an order, I will talk about this morning, you review it yourself, and then walked over there.

　Rolling all over the floor to ask for all kinds of support, recommendation tickets, monthly tickets, collections, and even rewards are all okay, please everyone! ! !
　　
　
(End of this chapter)