History and technology of shovel

Everyone should have seen a shovel. The shovel is a production tool that is widely used in production and life, and it still becomes the iron rice bowl of some niche groups today.
In terms of traceability, it must be traced back to the Stone Age. At that time, it was made of stone and used to plow the fields. The specific production process can no longer be verified.
We can talk about the significance of the shovel to life in the 1980s and 1990s. At that time, every household would have a shovel. No matter how many acres of land your family had, in addition to plowing cattle, it would be plowed by people. Cattle plowing was also a standard equipment for landlords and local tyrants. So whether I could eat at that time depended entirely on it.
At present, the application of shovel in life still exists, but the glory and prosperity of the year no longer exists. The industry is also slowly dying. Today, with nostalgic feelings, I will give you a popular science on the production of shovels.
• intercept material
First of all, the shovel needs a certain hardness and rigidity to cut steel, and the cutting process is gas cutting.
The offcuts are cut first, and then the steel is cut into equal parts.
I would like to take this opportunity to give you the principle of popular science gas cutting: gas cutting refers to the use of gas flame to preheat the metal to be cut to the ignition point, making it burn violently in the pure oxygen flow, forming slag and releasing a lot of heat. Under the action of blowing force, the oxidized slag is blown away: the heat released further preheats the next layer of metal to reach the melting point. The metal gas cutting process is a continuous process of preheating, combustion, and slag blowing. Its essence is the process of burning metal in pure oxygen, not the melting process.
• Heated rolling
Firstly, the steel is heated, and the temperature is controlled at 1000~1200. The austenite crystallization can only be formed when the temperature is above the A3 line, so it must be heated to that temperature range.
The heating process is very slow, need to wait patiently. After the heating is completed, the steel is first forged.
The forging machine forges the steel hard, which will make the structure and performance of the steel more uniform. After the forging is completed, it comes to the rolling link.
To put it bluntly, it is to slowly adjust the gap of the rollers so that the steel is rolled into thin sheets. Such a workplace is also very dangerous, and it is not easy for workers. After rolling to a certain thickness, it needs to be fine-pressed by a set of rollers.
This set of rollers belongs to precision pressing, which makes the thickness of the steel strip uniform. In this way, the production of the steel strip comes to an end.
• Blanking, forming
The finished steel strip needs to go through the first process - mold blanking.
Through the detailed calculation of the engineer, the corresponding mold is made to punch the steel strip, and the blank to be used before the final molding is obtained. Such a mold is actually very simple, and the strip is punched into the corresponding model through the pressure transmitted by the punching machine. This mold is a leak bottom mold. After the punching is completed, the sheet needs to be simply punched.
It is also very simple to reopen the mold. After the punching is completed, the billet needs to be heated.
After heating, the billet needs to be shaped immediately.