Chapter 177 Revolution in the field of finishing (Happy National Day!)
After catching this fleeting idea, Chang Haonan suddenly felt that the road was broadening.
The hole diameter (tooth gap) of 0.3mm is an unmanageable size for a reamer (toothpick), and the microstructure inside the hole is also very unfriendly to the reaming process.
Moreover, the reamer has to rotate after all, so it cannot be made of hard but brittle materials, otherwise it will easily collapse.
Just like toothpicks break easily during use.
But another way of thinking is to process ultra-high hardness corundum or diamond into powdery objects with a particle size of about 100 microns or even smaller, then mix them with water or oil or other fluid matrix, and pressurize them The air film holes flowing through the blades can completely meet all the conditions written on the notebook.
This is the idea of the dental rinse used by many people in later generations.
“Comrades, I have an idea.”
Chang Haonan put down the water glass in his hand.
Everyone’s eyes turned over instantly.
Although he is not an engineer at Factory 410, he does not seem to have any experience in the manufacturing field.
But in the past six months, Chang Haonan has created too many miracles on the J-8C and Turbojet 14.
Enough for everyone here to ignore his intellectual background.
“I thought of a new way of grinding.”
Chang Haonan stood up as he spoke, walked to the blackboard not far behind him, and picked up a piece of chalk. , something similar to a funnel was drawn on it:
"The general structure of this equipment should be like this. There are two symmetrical cylinder-shaped containers. The parts and fixtures are fixed in the channel between the two containers and the piston in the cylinder squeezes the abrasive to flow back and forth. The relationship between the abrasive fluid and the surface to be processed The flow between them can produce a grinding effect."
His painting skills are average, and many of the technical terms used in mechanical processing are not strict enough, but fortunately, the audience below are all knowledgeable. I still understood the schematic diagram on the blackboard after talking about it.
“Sandblasting process?”
Someone soon said a term:
“It is said that in Germany, this method is used when manufacturing internal combustion engine cylinders. For polishing, it mainly relies on the impact of the spray material on the surface of the workpiece. There are certain requirements for the particle size and size of the abrasive, which is difficult to use on air film holes of our size. ”
This process name is new knowledge to Chang Haonan. He has not been exposed to it before, but from the other party's words, he still heard the difference from his own thinking:
"So we can't put these The process is copied directly.”
Chang Haonan drew a key symbol on the abrasive part inside the container:
“The fluidity and controllability of pure solid abrasives are too poor during the processing. It will inevitably cause damage to the parts of the turbine blade surface that do not require polishing, so my idea is to mix very fine hard particles, such as silicon carbide, white corundum, and diamond, with relevant liquids and prepare them into a paste. , semi-fluid media as abrasives. ”
“As the saying goes, water has no shape. Such soft abrasives can automatically drill into the holes that need to be polished under pressure without exposing them to the outside world. The surface has too many effects. Not to mention our straight air film holes, even curved holes and special-shaped holes with more complex internal structures can be processed using this method. ”
After a long paragraph was finished, the entire conference room was silent.
Everyone, including Zhong Shihong, began to seriously think about the feasibility of the ideas on the blackboard.
Although the chalk drawing itself is slightly abstract, the ideas contained in it are obviously extremely valuable.
Grinding, similar to turning, milling, planing and other methods, is also a typical cutting processing method.
However, with the increasing demand for surface smoothness and the emergence of various non-planar and non-axisymmetric parts, traditional grinding machines have been difficult to meet the increasingly bizarre industrial requirements.
Especially uneven surfaces and curved channels cannot be effectively processed by ordinary tools and molds.
This is also a recognized problem in the field of finishing today.
The answer currently given by developed countries is electrochemical grinding. It’s said to be grinding, but what really comes into play is the electrolysis process.
The workpiece to be processed is used as the anode of the electrolytic cell, and polishing is achieved under the condition of electricity through the difference in chemical potential between the metal matrix and the impurity layer on the surface.
Obviously, this requires an extremely strong level of electrochemistry. As long as the control conditions fluctuate slightly, intergranular corrosion can easily occur, causing the entire product to be scrapped.
If Factory 410 has this ability, it would be better to use electro-hydraulic beam processing from the beginning to avoid the formation of a remelted layer from the root.
In fact, this is also a common problem in China's manufacturing industry today.
It’s not that a certain key technology fails, but that everything fails. With so many things going on, it’s even difficult to find a quick and effective starting point.
Factory 410 is just a microcosm of it.
This leads to the fact that even if some technological breakthroughs are made, such as electric spark drilling technology, there are still shortcomings in other aspects of the entire process, and the final product is often difficult to satisfy.
Chang Haonan's idea is equivalent to making the shortest board of the barrel longer.
If it can be realized, it will definitely not be just the 410 factory that will benefit.
The entire machining industry, and even the entire manufacturing industry, will directly benefit from this!
“I think this idea...is worth a try!”
The first person to speak was the engineer in charge of the product post-processing section:
“But according to my experience, the core technology of this process should be the formula of soft abrasives and the grinding process of different workpieces. "
"If we want to start from scratch in this aspect, we may have to be prepared for a long-term battle."
According to common sense, he The concerns are clearly justified.
This thing is somewhat similar to materials science. It is difficult to determine the direction directly when you first start researching. You often need to cast a wide net to try your luck.
For example, the composition, ratio, and particle size of the abrasive particles, as well as the viscosity and chemical properties of the abrasive matrix, etc., all need to be tried out bit by bit.
As the research process becomes more and more in-depth, we can slowly find some rules and reduce blindness to a certain extent.
However, there happens to be an irrational person here.
“Don’t worry about this.”
The most troublesome part in others’ eyes is actually what Chang Haonan is best at:
"Regarding the development of soft abrasives and the control system during processing, I can use some simulation methods to initially determine the most feasible research direction. The progress should be much faster than you expected."
"But other parts of this grinding equipment, especially the tooling fixture and the mechanical structure that specifically realizes the piston extrusion in the cylinder, need other people to help me complete it."
After Chang Haonan finished speaking, he gently Put down the chalk in his hand.
What came into view were a dozen faces full of stunned expressions.
“This... can also be simulated?”
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(End of this chapter)