One day in the spring of 1973, due to the large production tasks of the month, all the teams and sections in the workshop were busy. The Chengdu City supply bureau also came to join in the fun at this time. They were prepared to implement a blackout on our factory area before 9 a.m. on the 30th of the end of the month to repair the power supply equipment in the area.
In order to complete the production tasks in the workshop, a mobilization meeting was held in the workshop. The entire workshop had to take measures to complete the last opening of the furnace of the month before 9 am on the 30th to ensure the smooth completion of the monthly production tasks in the workshop.
At the mobilization meeting, the workshop director repeatedly emphasized the importance of successfully opening the furnace on the 29th to ensure the completion of the month's tasks. Special requirements: Every section, every team, every employee, continue to work overtime day and night, carry forward the spirit of continuous fighting, to ensure that the workshop can be opened smoothly. The party branch, the secretary of the Youth League branch, and the head of the trade union also mobilized their thoughts at the meeting.
After a few days of preparation, the models needed for the project had long been sent to the sand room. The sand mold for casting had been completed in the sand room, and the big brown materials for casting and smelting molten iron had been piled up in the stock yard. After 8:00 pm on the 28th, the furnace temperature had been raised. Pig iron, coke, scrap steel and other raw materials were filled into the furnace. After being smelted at high temperature in the cupola, they had turned into red molten iron in the furnace. The workers in front of the furnace opened the iron outlet of the cupola, and the red molten iron flowed into the ladle placed in the pit in front of the furnace in advance.
Immediately after, a sharp and urgent bell rang from the overhead crane, warning everyone on the ground in the workshop. The molten iron is coming soon. Everyone must pay attention to the ladle above our heads. We must ensure that the ladle's path is unimpeded. " Safety is for production, and production must be safe." A few eye-catching words hung on the beam of the crane once again reminded everyone to pay attention to safety.
The temperature in the ladle was above 1300 degrees Celsius. Even if a drop of molten iron fell onto a person, it would be like a bullet hitting a person's body. It was even more powerful than that. Because the molten iron still carried a temperature of 1300 degrees, it was enough to burn a person's body. This is definitely not a game to be played
The driver moved the crane to a position vertical to the pit in front of the furnace. The hook of the crane moved to the top of the molten iron outlet in front of the furnace and lowered the lifting hook. Two lifting workers hung the lifting hook on the handle beam of the molten iron ladle. With a sharp whistle, the lifting hook was lifted away from the molten iron outlet of the cupola. The crane moved back and forth on the two steel rails in the top of the workshop. From the front of the cupola to the top of the sand casting section, it entered the tense and orderly process of subway water-poured iron casting.
In the sand casting section, we saw another busy scene. The red molten iron flowed through the outlet of the ladle like an orange trickle. According to our predetermined pouring plan, it flowed into the big iron sandboxes through the cylindrical runners one after another. After the orange-red molten iron entered the sand box, it would fill up the space of the sand mold that had been prepared in advance. Just like how we used a white iron kettle to fill a warm water bottle at home, when the molten iron was filled up in the sand mold, it would come out from the pouring head. Seeing this situation, it would immediately turn to the casting of the next sand mold. Once the molten iron solidified in the sand mold and cooled down, it formed the cast iron we needed.
The casting heads here were basically cylindrical, and the molten iron would enter the big sandbox through the casting heads. After reaching the sand mold, it gradually filled up the space left in the sand mold. The casting head couldn't be big or small. The preparation and installation of the gating head were very particular. If the casting head was left too big, the molten iron would easily damage the sand mold, causing the cast iron to be scrapped. If the casting head was left too small, the molten iron would solidify before it could reach its position. It would also cause the cast iron to be scrapped.
I observed carefully from a distance. The principle of the sand casting workers pouring molten iron into the sand mold was exactly the same as how we usually hold a kettle and pour boiling water into a teacup. Two or three people were controlling the handle of the ladle's runner, adjusting the angle between the ladle's exit and the pouring head. Another waved the red and green flag in his hand to command the carriage and control the specific position and height of the ladle. There was also one that was dedicated to observing the depth of the water.。Judging from the process of pouring molten iron, everyone had their own role. No one could do without each other. The coordination between them was so harmonious that it was like a symphony orchestra performing a concerto.
It was a cold spring night in the Tiaodenghe area of Chengdu City. The cold wind blew outside the workshop, making people shiver. Through the iodine-tungsten lamp hanging under the crane beam in the workshop, countless thin diagonal lines appeared under the light. It could be seen that it was raining outside the workshop again. Although spring rain is as expensive as oil, to us steel workers. The late night shift in early spring was really too cold. I think it's warmer in the workshop.
In the forging workshop, amidst the tense and orderly labor scene, I deeply felt it. In our workshop, every product is inseparable from the cooperation of all the processes in the workshop. Every step of the production process had to be done properly to ensure that the products produced were up to standard. Here, every employee was required to do their duty. A high degree of organizational discipline was required. This was the basic characteristic of a steelworker.
At the critical moment when half of the scheduled production task was completed, in the iron-melting section, a steel wire rope suddenly broke between the loading pit at the back of the furnace and the loading platform at the top of the iron-melting furnace. It was impossible to replace it in a short period of time. The steel wire rope had to be replaced behind the furnace in the dark of the night, and the quality of the work could not be guaranteed. What was worse was that it happened in the middle of the night, and the warehouse in the factory could not issue materials. This problem was difficult to solve in a short period of time, and it would definitely affect the normal production of the cupola.
At this moment, the orange-red molten iron was still being transported out of the furnace one after another. The raw materials on top couldn't enter the furnace. Once the molten iron in the furnace was drained, it would reach a temperature of over 1300 degrees Celsius. However, it couldn't be stopped for a short period of time. Due to the lack of raw materials, if the furnace continued to dry up at a high temperature of over 1300 degrees Celsius, it would cause an accident, just like the boiling water on the furnace at home. The destruction of the furnace was imminent and could happen at any time.
At this tense moment, the old company commander, workshop director, and branch secretary of the workshop immediately issued an emergency mobilization order."The entire workshop (except for the sand mold section and the furnace front operators, because the furnace front operators and all the staff of the sand mold section, as long as the furnace is opened, no one can leave their posts.）All members of the Party and the Youth League immediately gather behind the cupola. We will use our hands and arms to transport the raw materials by hand. We will never let a kilogram of materials fall on the ground. No matter how difficult it is, even if the sky falls, we must ensure that the iron-smelting section can be opened smoothly.”
At the order, the members of the Party and the Youth League immediately started from the raw material field and extended to the top of the furnace. They used their powerful hands to form a strong steel transportation line. The measured raw materials such as pig iron, coke, and scrap steel were continuously transported to the feeding platform on the top of the furnace from the raw material yard through our hands. In the queue of the transportation line that was dozens of meters long, there were white-haired old workers, old cadres, and energetic young people. The whole workshop was mobilized. There were also more than ten family members of the employees who came to the factory to visit their relatives. They also scrambled to squeeze into this steel transportation line. Even the canteen cooks who delivered meals to the on-site staff at night were strongly influenced. They hurriedly stored the food in the workshop office, closed the door, and ran over, scrambling to stand in the queue of the steel transportation line.
Facing the imminent danger, they did not run away for their own lives, but faced the difficulties together. They used their own hands to build an indestructible steel transportation line to ensure that the raw materials in the cupola could be melted normally. The sweat of all the workers in the workshop flowed together, and no one had the time to eat the night shift meal sent by the canteen cook.
After a few hours of continuous fighting, they finally reversed the passive situation. Six hours of intense hard work. All the materials in front of the cupola had been melted into molten iron. All the sand molds prepared by the sand casting section had been poured. Finally, at 7 o'clock on the morning of the 30th, before the power failure of Chengdu City supply bureau in Tiaodeng River area, the workshop finally completed the opening of the furnace. The workshop's monthly production task was completed two days ahead of schedule by 30%. It was very rare for him to receive praise from the factory leaders and the construction company.
During the period when the power supply bureau was repairing the power supply equipment, the model room could arrange for hand-made models, using less machinery and more manual work to make more non-standard mechanical models. He could also arrange for more sand molds to be made in the sand room, and the cupola section could also use manual cutting methods to cut the scrap steel with oxygen and ethyne gas. The workshop was preparing for the next furnace.
After the furnace was opened, I returned to the model room to work. I opened my workbench and took out a few commonly used tools. I was prepared to sharpen the tools that needed to be sharpened and repair them. Then, I would look for the team leader to accept the task.
At this time, technician Liu from the workshop came to my workbench. She held a piece of incomplete arc-shaped cast iron part and asked me tentatively,"Can I make a new model of the object that is roughly the same as this incomplete arc-shaped cast iron part?"
Please see the next section,"Proof of the Center Line of the Incomplete Arc Shaped Workpiece"
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