In the mechanical manufacturing laboratory, the sound of metal-metal friction and cutting did not appear. As an experienced top mechanical expert, Zhuang Qianding did not rush to actual manufacturing, but prioritized designing a processing plan and designing a deep hole drill bit.
In the past, Zhuang Qian Ding was mainly limited by thinking, and there were certain limitations in concepts. Now with the emergence of Yu Hua's novel processing method, Zhuang Qian Ding immediately came up with a series of inspirations.
"Yu Sheng, you are good at math. Calculate the shape parameters of the drill bit."
"Okay, I will build a mathematical model, and the drill bit design parameters are..."
"No wonder Luo Geng and Wu Zhi like you so much. I'm starting to like you too. Then give me the data here. This is the drilling efficiency so I can compare."
"good."
"Let's do some calculations here. Since the hardness of the drill bit is the same as the hardness of the workpiece, what is the approximate feed speed I need to prevent the tool from collapsing, and then add the coolant flow rate as a variable factor."
"immediately."
In the past, it often took Zhuang Qianding more than ten minutes to calculate a piece of data. But now, Yu Hua, who has an extremely high academic level, and a terrifying computer that is like a humanoid computer, can be said to be even more powerful.
As long as the corresponding parameters are given, the corresponding calculation data can be given in no more than ten seconds, and the data can be stored for a longer period of time to improve drawing efficiency.
This feeling makes Zhuang Qianding feel more relaxed than ever before.
Half an hour later, a highly efficient deep-hole drill design with a diameter of 7.92 mm and rigorous mathematical verification appeared. Three views and processing drawings were drawn in accordance with the latest Chinese drawing standards.
Without any hesitation, the whole work entered the most important link, manufacturing.
The manufacturing process is mainly handled by Zhuang Qianding. Yu Hua, who has never had any serious contact with machine tool processing, did not choose to get started. This is not his strong point. In addition, his energy is exhausted and his thinking approximates the physical system, making it impossible to simulate machine tool processing training.
However, only the Zhuangqianding is enough.
"Buzz!"
The gun barrel blank, which is 60 centimeters long, is placed in the three-claw chuck and firmly fixed. The American-made ordinary car in the center of the laboratory is powered on and activated. The motor in the spindle box runs at high speed, driving the entire blank clockwise.
In high-speed circular motion, Zhuang Qianding stared at the workbench with his eyes, moved the tool holder with his right hand, and controlled the turning tool to contact the gun barrel blank.
The machine tool must be operated carefully and meticulously, and carelessness is not allowed. In the worst case, the machine may be damaged by a collision, or in the worst case, life may be in danger.
When a high-speed moving tool moves, the kinetic energy contained in it is no worse than that of a bullet of the same volume, and the killing effect is even stronger because the surface of the tool fragments is irregular.
"Bah!" A slightly sharp friction sound came out, circles of filamentous metal appeared, and cooling oil continued to flow out to prevent the contact surface between the tool and the workpiece from overheating.
Delicate and gentle.
This is Zhuang Qianding’s driving style.
Accuracy is the most basic requirement for lathes.
Time passed by, and about an hour later, as the main spindle box was powered off and stopped working, the entire turning process ended. The diameter of the deep-hole gun-drilled workpiece on the chuck was significantly smaller, and the groove under the workbench was full.
It's waste.
"The plus and minus tolerance is seven wires, which meets the standards. Fortunately, the skills I learned in the United States have not been lost."
Zhuang Qianding removed the deep-hole gun-drilled workpiece and measured the diameter tolerance with a micrometer. After getting the parameters, he breathed a sigh of relief and smiled to Yu Hua: "I mainly studied mechanical design and theoretical knowledge in the United States, and I didn't pay much attention to mechanical processing.
I learned roughly that when I was young, I could control the tolerance between three and five wires, but now I can’t.”
"Awesome." When Yu Hua heard the geometric tolerance parameters, he immediately felt admiration in his heart. He gave a thumbs up with his right hand to express his praise.
The machining error of ordinary turning machines is maintained at seven wires. Yu Hua does not know what the machining accuracy of fitters and lathes in this era is, but he knows that Professor Zhuang himself is particularly awesome.
What is the concept of seven silks?
It is about 1.4 hairs thick and the size tolerance is 0.07mm.
Even though the number seems huge, it is far inferior to the various high-precision machining centers that reach the micron level in the news of later generations. But don’t forget that this was China in 1937 and it was impossible to independently produce high-precision ball screws.
and China of high-precision servo motors.
The accuracy of the parts processed by Professor Zhuang using this American-made lathe completely reaches the level of German-made lathes, and the processing accuracy is extremely high.
The important thing is that their main focus is not on mechanical processing, but on mechanical design and theory, including chemical engineering, electrical engineering and metallurgy.
"Let's go ahead and try to process the first barrel as soon as possible." Zhuang Qianding heard Yu Hua's praise. He, whose real age was only thirty-five, showed a proud smile and drilled the workpiece with a deep-hole gun.
Go straight to the gantry mill next to it.
The deep-hole gun-drilled workpiece whose geometric tolerance meets the standard will next be milled to mill out the drill bit shape and 120-degree V-shaped angle on the workpiece.
After fixing the workpiece and making preparations for processing, Professor Zhuang carefully looked at the processing drawings, confirmed that they were correct, and then started the big machine.
The entire gantry milling machine enters the working state, the chuck feeds downwards, and the milling cutter rotates at high speed. When the cutter contacts the surface of the workpiece, metal chips appear again.
The main feature of a lathe is that the spindle fixes the rotation of the workpiece for the main motion, and the cutter is the feed motion. The main feature of the milling machine is that the rotation of the milling cutter is the main motion, and the movement of the workpiece and the milling cutter is the feed motion.
Lathes are mainly designed for workpieces with various rotating surfaces and spiral surfaces, and cannot process flat surfaces and grooves. Milling machines can process flat surfaces, grooves, gears and various curved surfaces, as well as workpieces with more complex shapes.
Together, the two can solve the processing problem of deep hole gun drilling.
"Buzz!" The spindle rotates continuously. The high-speed rotating milling cutter is controlled by Zhuang Qianding to accurately mill the surface of the workpiece. In just a few minutes, the geometric shape of the deep hole drill has appeared.
Grooving and processing V-shaped corners.
The V-shaped angle is the most commonly used and practical design for deep hole gun drilling. From the drill bit to the drill body, the coolant and metal debris during drilling can come out through the gap reserved by the V-shaped angle.
The deep hole gun drill designed by Zhuang Qianding only improves the shape of the drill bit without changing the V-shaped angle design of the drill body. However, the shape of the drill bit is calculated by Yu Hua and the drilling efficiency is about 5% higher than the conventional deep hole gun drill bit design.
Not much, but it's progress.
Half an hour later.
The gantry mill was powered off and shut down. Lying on the workbench was a deep-hole gun drill that was silver-white in color and exuded a metallic luster.
"The accuracy meets the tolerance standards." Zhuang Qianding took off a brand new deep hole gun drill and used a micrometer and feeler gauge to measure the machining accuracy and plane accuracy respectively. After getting the parameters, he breathed a sigh of relief.
"A success, Professor Zhuang, we are only one step away from success." Yu Hua realized that he was now just a salty fish who could only shout "666", smiled, and quickly sent his congratulations.
The deep hole gun drill was successfully processed in one go. This was all due to Zhuang Qianding and had nothing to do with Yu Hua.
However, this in no way prevents Yu Hua from sending congratulations and praises and showing his sense of existence.