The size of a subway car asks how the experimental cabin was built?
Release time:
2022-08-08
【Summary Description】 The subway car is so big, the question is how the laboratory was built. The test chamber integrates the functions of platform and test load. The total length of the engine room is 17.9 meters and the diameter is 4.2 meters. The launch weighed 23 tons, and the relevant indicators were higher than those of the Tianhe core cabin, and the size and weight of the carriage were equivalent to those of a carriage on Beijing Metro Line 13. How was the world's heaviest single-cabin active-duty on-orbit aircraft built? China Aerospace Science and Technology Corporation No. 529 plant is an important satellite and spacecraft research base in China. It is also the main research unit of the space station module structure. The mission of the Tianhe Core Module is completed here. The construction of the Wentian experimental module is more challenging and more difficult. The process technicians broke through the process bottleneck and developed a series of key technologies to ensure the high-quality delivery of capsules. From single to double, the difficulty more than doubles. The experimental cabin consists of a working cabin, an airlock cabin and a resource cabin. Among them, the airlock bears the mission of long life and installing a variety of equipment, and the requirements for important load-bearing structural parts are very high. After the demonstration, the researchers decided to use the internal and external double-rib plate structure with higher carrying capacity. Different from the conventional outer rib wall plate, the inner and outer rib walls need to add inner ribs on the inner cylindrical surface. The forming operation is very difficult to implement, and the forming defects and forming accuracy are also difficult to control, and mistakes will be made if you are not careful. From single to double, the difficulty is more than doubled. The outer ribs are visible and easy to operate. The inner rib is in the cylindrical surface, which is not only difficult to operate, but also requires seamless and high requirements. The design of the mold is very important: what kind of mold can effectively avoid the internal ribs. How to ensure the forming accuracy of the inner and outer sides of the double-rib plate? In addition, what is the bending forming trajectory of the inner ribs. How to set process parameters. These problems have never been encountered before. After repeated analysis and testing, the craftsmen put forward such a mold design scheme: first spell, then assemble, avoid the position of the internal ribs, and then bend the product. Finally, the optimized bending forming path is obtained, and the reasonable forming path and bending process parameters are set. The precision forming of inner and outer double-ribbed panels was successfully realized, which met the design requirements. The welding difficulty increases exponentially with the interval curve. The door frame of the door is connected by welding process, which is a typical space curve weld. The welding deformation is small and the quality is high. From plane to space, from straight line to curve, the difficulty of welding also increases exponentially. The welding of this spatial curve was done manually in the past, and the welding thickness was increased to 5mm. When welding by hand, researchers need to weld layer by layer. The heat input is large, the product size is not easy to grasp, and the structural stress after welding is large, which cannot meet the reliability requirements of the long-term operation of the space station in orbit. The only way out is to overcome the inter-curve automatic welding technology. After research and testing, the researchers designed a flexible welding device. The welding of the sealed compartment door frame has been successfully completed, and all indexes meet the design requirements. Reliable curve connection between sealed compartments. The bulkhead heating tube of the experimental cabin can be said to be a kind of space protective clothing. The increase of the experimental module structure means that the number of heating tubes will increase. And the overall direction of the pipeline layout is a three-dimensional space structure, so the heating pipe section design is "Ω-shaped", similar to a circle plus a plane, highly attached to the interior of the cabin, convenient for temperature sensitive control. To this end, the researchers innovatively put forward the "flexible partition, integral forming" technology, that is, the pipeline is made of high-precision three-dimensional curved surface and attached to the inner surface of the cabin.
The subway car is so big, the question is how the laboratory was built.
The test chamber integrates the functions of platform and test load. The total length of the engine room is 17.9 meters and the diameter is 4.2 meters. The launch weighed 23 tons, and the relevant indicators were higher than those of the Tianhe core cabin, and the size and weight of the carriage were equivalent to those of a carriage on Beijing Metro Line 13. How was the world's heaviest single-cabin active-duty on-orbit aircraft built?
China Aerospace Science and Technology Corporation No. 529 plant is an important satellite and spacecraft research base in China. It is also the main research unit of the space station module structure. The mission of the Tianhe Core Module is completed here.
The construction of the Wentian experimental module is more challenging and more difficult. The process technicians broke through the process bottleneck and developed a series of key technologies to ensure the high-quality delivery of capsules.
From single to double, the difficulty more than doubles.
The experimental cabin consists of a working cabin, an airlock cabin and a resource cabin. Among them, the airlock bears the mission of long life and installing a variety of equipment, and the requirements for important load-bearing structural parts are very high. After the demonstration, the researchers decided to use the internal and external double-rib plate structure with higher carrying capacity.
Different from the conventional outer rib wall plate, the inner and outer rib walls need to add inner ribs on the inner cylindrical surface. The forming operation is very difficult to implement, and the forming defects and forming accuracy are also difficult to control, and mistakes will be made if you are not careful.
From single to double, the difficulty is more than doubled. The outer ribs are visible and easy to operate. The inner rib is in the cylindrical surface, which is not only difficult to operate, but also requires seamless and high requirements.
The design of the mold is very important: what kind of mold can effectively avoid the internal ribs. How to ensure the forming accuracy of the inner and outer sides of the double-rib plate? In addition, what is the bending forming trajectory of the inner ribs. How to set process parameters. These problems have never been encountered before.
After repeated analysis and testing, the craftsmen put forward such a mold design scheme: first spell, then assemble, avoid the position of the internal ribs, and then bend the product. Finally, the optimized bending forming path is obtained, and the reasonable forming path and bending process parameters are set. The precision forming of inner and outer double-ribbed panels was successfully realized, which met the design requirements.
The welding difficulty increases exponentially with the interval curve.
The door frame of the door is connected by welding process, which is a typical space curve weld. The welding deformation is small and the quality is high.
From plane to space, from straight line to curve, the difficulty of welding also increases exponentially.
The welding of this spatial curve was done manually in the past, and the welding thickness was increased to 5mm. When welding by hand, researchers need to weld layer by layer. The heat input is large, the product size is not easy to grasp, and the structural stress after welding is large, which cannot meet the reliability requirements of the long-term operation of the space station in orbit.
The only way out is to overcome the inter-curve automatic welding technology. After research and testing, the researchers designed a flexible welding device. The welding of the sealed compartment door frame has been successfully completed, and all indexes meet the design requirements. Reliable curve connection between sealed compartments.
The bulkhead heating tube of the experimental cabin can be said to be a kind of space protective clothing. The increase of the experimental module structure means that the number of heating tubes will increase. And the overall direction of the pipeline layout is a three-dimensional space structure, so the heating pipe section design is "Ω-shaped", similar to a circle plus a plane, highly attached to the interior of the cabin, convenient for temperature sensitive control. To this end, the researchers innovatively put forward the "flexible partition, integral forming" technology, that is, the pipeline is made of high-precision three-dimensional curved surface and attached to the inner surface of the cabin.
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