I am an industrial worker during the War of Resistance

Chapter 39 The Type 56 semi-automatic rifle should be ready soon.

After the barrel of this ZB26 Czech light machine gun was firmly and completely clamped to the mold.

The mold was pushed into the forward-opening U-shaped slot.

At this moment, Chen Changzai's student took out a measuring ruler and measured the perpendicularity between the mold and the hydraulic cylinder head.

After confirming that there were no problems, he said to Chen Changzai, "Teacher, the gun barrel is locked and the mold is in place."

Verticality is normal.

It can now be suppressed.

Please provide instructions, teacher.

Chen Changzai observed the entire process of the students' operation.

Therefore, he was aware of whether the students were operating correctly.

The gun barrel was encased in a hinge-like mold, at the junction of the two hinge molds.

There is a vertical semi-circular groove in the middle. When the two semicircles are closed, they can hold a gun barrel tightly.

Below the groove, there is a protrusion.

It can be stuck in the barrel, yet allow the die to slide out.

When Chen Changzai saw that all these preparations were completed.

He said to his students, "Let's begin. You will do this first operation yourselves."

Don't rush, control your speed, pay attention to safety, and be careful not to break the club and injure someone.

"is teacher."

The student then turned to the person next to the control panel and said, "The die extrusion press is about to begin preparations."

The others retreated to the safe zone.

The most feared accident during die extrusion is rod breakage.

The push rod that pushes the mold head down is not thick.

Moreover, it must be rigid, otherwise it will bend on its own if it cannot push the mold head, which would make the push rod very brittle.

If the angle of the push is incorrect, the rod can easily break.

Although a protective ring is added when the hydraulic press is working to prevent the rod from breaking.

However, when you first start positioning and pressing down, you still need someone to hold you for a while.

Once the oil-soaked, finger-length mold head was placed on the oil-soaked gun barrel, the mold head's guide post was already inserted into the gun barrel perfectly.

At this moment, the student on the control panel pushed the joystick, and under the control of the joystick, the hydraulic rod slowly descended.

The difference between a hydraulic press and a forging press is that a forging press needs to generate enormous and intense force in an instant.

Hydraulic presses, on the other hand, require sufficiently large, but slow, gentle, and stable force.
Hydraulic presses also have a flywheel, but this flywheel is used to balance the pressure when the steam engine's power is not smooth enough.

It can compensate for power and divert pressure when the output power of a steam engine is unstable.

As the hydraulic rod slowly descended, it paused briefly when it touched an iron bar held by a student between the mold head and the rod head, indicating that it had been compacted.

This thick iron rod is not a push rod, but the first pressure rod that presses the die head into the barrel.

So it's only the length of a forearm and as thick as a fist, it will never break.

After the hydraulic rod compacts the material, pressure is gradually increased again.

The high-carbon steel die head was visibly pressed into the gun barrel.

When the head and tail of the mold have been pushed in three centimeters.

The iron bar has reached its limit position.

The hydraulic rod then retracts, returning to its highest position.

The thick iron rod was removed and replaced with a push rod that was slightly thinner than the gun barrel, almost perfectly fitted, and 800 millimeters long. It was placed between the mold head and the hydraulic rod head.

Because there is a locating pin at the back of the mold head that is matched with this long push rod.

At this moment, the groove on the push rod fits perfectly into the tail of the mold head.

The long push rod is blocked by the barrel wall on the outside and positioned by a locating pin on the inside, so the push rod basically does not wobble.

Once the push rod is in place, the hydraulic rod moves downwards again.

It pauses again when it presses onto the circular surface at the end of the long rod.

This circular plane is much thicker than the push rod, and it is integrated with the push rod, forming a tapered connection.

It is designed to make better contact with the lower surface of the hydraulic rod and reduce the sway of the push rod.

After the push rod was pressed down, Chen Changzai's student took a step back and closed the protective barrier.

Then he came to a small platform about half a meter high next to the hydraulic press.

From here, he can see the progress of the push rod inside the protective enclosure from above.

Under his direction, the students on the control panel continued to pressurize the hydraulic rod.

At this point, the push rod seems to encounter no resistance at all.

A slow and smooth downward motion.

A little over a minute later, a "thump" was heard from under the hydraulic press. That meant the die head had emerged from the other end of the barrel.

The sound it made when it fell into the wooden box below the mold head.

When the student in charge gave a stop signal, the hydraulic rod stopped moving and retracted upwards to its original position.

At this moment, the other students all gathered around.

The protective plate was opened, the mold was pulled out, and the locking bolts were loosened.

The gun barrel, which had become hot due to the high pressure, was removed.

After pulling out the push rod inside the barrel.

The students didn't care whether it was oily or not, and just handed the gun barrel to Chen Changzai.

Although the high pressure caused the barrel to generate some heat, it was not to the point that it was unusable.

What's more, they were wearing gloves.

At that moment, Chen Changzai was standing in front of a wooden tabletop repair station, watching the students take the gun barrel over.

"Teacher, it's done! The process was very smooth," the student said.

Chen Changzai, however, did not take the gun barrel. He wanted his students to personally experience the joy of success or the pain of failure.

Regardless, they started this project themselves, so it's more meaningful for it to have a result in their hands.

So Chen Changzai said, "Take a measuring tool and check if there are any errors, whether the rifling of the inner tube wall is up to standard, and whether the winding pitch is up to standard."

"is teacher."

The students then picked up the measuring tools that had been placed on the table and began to take measurements.

"The pipe opening is qualified and there is no deformation."

The straightness is acceptable, and there is no bending.

The inner wall appears to be in good condition, with no burrs found.

The rifling inspection slider moves normally without any blockage.

The depth of the bearish candlestick is normal, with no protrusions.

The positive line test is normal, with no bulges or depressions.

The twist rate value is normal and meets the requirements.

The gun barrel was a success.

The gun barrel is a success.

We succeeded once again.

After the student in charge of testing finished all the tests, he loudly announced the good news.

At this moment, the students who had gathered together cheered once again.

They did everything themselves from start to finish.

How could they not cheer?

Just then, Master Liu and Master Zhang came over with the mold that had fallen into the wooden box and been forgotten by the students.

"Director Chen, look, the mold head is fine, there is no wear at all."

Even the sharp angles of the creases on the die head are intact.

Director Chen, your method was successful.

I think this mold head can hold three to five hundred gun barrels without any major problems.

At least two hundred sticks were pressed.

This is absolutely perfect.

Especially the speed.

In the time it takes to pull one gun barrel out using a rigging machine, all ten gun barrels could be pressed out.

Master Zhang said excitedly, holding the mold in his hand.

The two experienced masters should certainly be happy.

If this mold can press out gun barrels so quickly, how many soldiers can be equipped with rifles they produce in the shortest amount of time?

Now we have bullets, gun barrels, and machine tools to process other parts of the gun.

The remaining task is to get all the soldiers armed and ready to eliminate the enemy in the shortest possible time.

They work so hard, isn't this the day they're all waiting for?

At that moment, Chen Changzai took the mold.

Looking at the shiny, oily gun barrels, he laughed and passed them around, showing them to the students.

Chen Changzai smiled at this moment.

He was thinking to himself whether he should take out his modified Type 56 semi-automatic rifle.

　Thank you to all my friends who have supported me.

　　
　
(End of this chapter)