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Chapter 95 Tongue and groove inspection

Seeing Lin Feng's mysterious expression, Ma Xiaoli immediately asked curiously, "Master, what is the bread in the dishcloth?"

Lin Feng whispered, "Put a scrapped broach in your cabinet first."

While speaking, Lin Feng opened the cabinet door of the work table next to the machine tool, and temporarily put the broach inside.

This is a very nice place.

It is far better than taking it back to the crafts and technology room. No one will rummage through the things in this work table, because it is dedicated to Hu Xiaoxiao and Ma Xiaoli.

Sure enough, everything was safe, and Lin Feng took the scrapped broach out smoothly when he got off work in the afternoon.

Some people may say that this is stealing things from the factory, but in the 90s and [-]s this kind of behavior was not considered stealing at all.

At that time, as a member of a large state-owned enterprise, no one had taken anything from the family.However, everyone also has a sense of propriety, knowing what can and cannot be taken.

After taking the discarded broach back, Lin Feng immediately found an old blacksmith and asked him to help him make a bone-chopping knife, a slicing knife, and a boning knife.

Because the alloy material is abundant, each knife is all alloy, not the kind where the blade is inlaid with a little alloy and the body of the knife is made of ordinary steel.

Whole body alloy, this kind of knife is not only sharp, but also has first-class hardness, will not curl the edge, and will not rust.

The old blacksmith said that it took 30 yuan to build it in three days.

To be honest, the price is a bit expensive, only three or five yuan for an ordinary kitchen knife. Considering that this is not an ordinary kitchen knife, Lin Feng did not counter-offer, but repeatedly told him that it must be beautiful and of good quality.

The next day.

Lin Feng, as usual, first proofread several copies of the newly compiled process regulations for the turboshaft eight engine, and then went to the production site.

"master!"

"Master, the second axial flow impeller has also been processed."

As soon as they saw Lin Feng approaching, the two apprentices greeted them proactively, and Lin Feng also saw the processed second axial flow impeller.

It is still very beautifully processed, still like a fine work of art, especially each blade is very bright, with the unique metallic luster of titanium alloy.

The inspection list for the first piece was also issued. Lin Feng picked it up and looked at it. Every size passed.

"The first piece is processed well, it's a good product!"

Hu Xiaoxiao said: "We don't dare to work here, the main reason is that master, you are good at programming CNC programs."

Lin Feng smiled and said, "Don't flatter me, the CNC program is one aspect, and the key depends on your processing."

Ma Xiaoli smiled and said, "Master, Xiaoxiao flatters you for a purpose. There is a new barbecue stand near the entrance of our dormitory. Xiaoxiao wants you to treat us to barbecue."

Hu Xiaoxiao immediately said, "No, no, I didn't mean that, it's probably because Xiao Ma wants to eat barbecue."

The newly opened barbecue stall Lin Feng also knows that the business is very hot, and the taste should be good, but he has not tried it yet.

So Lin Feng said, "No matter who you want to eat barbecue, I will satisfy you. After get off work in the afternoon, I will take you two to eat barbecue."

"Oh yeah, that's great!"

Ma Xiaoli was so excited that she almost yelled, it seemed that she was really the one who wanted to eat barbecue.

"Director Lin, Director Lin!"

Lin Weidong waved beside the vertical broaching machine, and Lin Feng walked over immediately, and saw that the sample had been drawn, and the sample was placed on the table.

There are two mortises on it, one of which has been lost due to the chipping of the broach, and the other is a re-drawn mortise.

Lin Weidong's apprentice was using an oil stone to remove the burrs on the edge of the tongue and groove, and he looked very serious.

"Squad Leader Lin, the sample has been drawn."

Lin Weidong said, "It's over. I called you here because I want you to take a look for us."

For broaching, Lin Feng is an expert, and he once worked as a broaching technician for a period of time.

Lin Weidong was also aware of Lin Feng's level, so he asked Lin Feng to come over to help take a look at the processing of this sample.

Lin Feng nodded lightly, and after Xiao Song removed the burrs from the tenon and groove, he picked up the sample and looked at it.

The first and second-stage turbine disks of turboshaft eight are relatively small, the diameter of the first-stage turbine disk is only 140+, and the diameter of the second-stage turbine disk is even smaller, with a diameter of only 110+.

Holding this one-to-one sample in his hand, Lin Feng carefully looked at it, first of all, the appearance.

The appearance of the tongue and groove is extremely demanding, and the smoothness is required to reach 0.8, and the smoothness of the two working surfaces is required to reach 0.4.

Not only look at the smoothness, but also look at whether there are appearance defects such as grooves and scratches in the tenon and groove. Even if it is very slight, it is absolutely not allowed.

The working speed of the turbine disc of the turbo shaft eight is as high as [-] revolutions. Under the high temperature environment, it can output a powerful power of hundreds of horsepower. The centrifugal force of the tenon and tenon of the blade is huge.

A small tenon and groove will be subjected to tens of tons of terrible pulling force. With such a huge force, a slight defect in the tenon and groove will cause irreparable losses.

There is no problem with the appearance, and all sides of the tongue and groove are very smooth, fully meeting the technical requirements.

After seeing the appearance, Lin Feng personally measured the size of the rolling rod of the tenon and groove, that is, the width of the tenon and groove.

Two matchstick-thick rolling rods, and then combined with high-precision plugs, Lin Feng finished the measurement skillfully, "The size of the rolling rods is qualified, and there is no problem with the appearance. You should measure it yourself."

Lin Weidong nodded, and took the rolling rod and plug to measure the size of the two rolling rods of the tenon and groove, and they were both qualified.

If the size of the rolling rod is not up to standard, it will be a little troublesome. It is necessary to remove the last forming broach and send it for regrinding.

There is no problem with the appearance!

The rolling rod is the right size!

Does this mean that the tongue and groove are qualified?

No, not necessarily!
The tenon-groove profile is too complicated, and only when the profile of the profile is also qualified can it be considered fully qualified.

How to check such a complicated tongue-and-groove profile? The working people have a way, and the 406 workshop also has a special set of inspection methods, that is, projection inspection.

The projection of the tenon and groove is generally magnified by 50 times, and then the projection of the tenon and groove is compared with the standard projection of the tenon and groove. If it is within the qualified range, the tenon and groove is finally qualified.

"Gong Lin, if I trouble you again, how about showing me the projection of the tenon and groove?"

The turbine disk is the key and important part. Lin Weidong dared not be careless at all, and invited Lin Feng to check it together. It is always good to have an extra person and a pair of eyes, not to mention that Lin Feng is an expert in broaching.

Lin Feng readily agreed, "Yes, no problem."

　Thank you "Yun Cong Yu He" book friend for the reward of 100 coins again, thank you very much!
　　
　
(End of this chapter)