What is a thin-walled tube?

Everyone is not unfamiliar when it comes to thin-walled tubes. Thin-walled pipes are widely used in refrigeration, machinery, chemical and other industries. The mass production of thin-walled pipes is generally cold-formed on a pipe bender. Because the critical force of the thin-walled steel pipe wall support instability is low, the bending part Deformation defects such as wrinkles often appear. These defects not only weaken the strength of the steel pipe and reduce its load-bearing capacity, but also easily cause uneven speed of the flowing medium in the pipe, eddy currents and accumulation of dirt in the bending part, which affect the normal use of the pipe. The biggest difficulty must be taken seriously.

Analysis of bending force and deformation of thin-walled steel pipe

When the thin-walled steel pipe is bent, the pipe bends and deforms under the action of external force. The outer edge of the bent part of the pipe becomes thinner under the action of tensile stress, while the inner edge of the pipe becomes thicker under the action of compressive stress. During the bending process of the pipe, the resultant force of the tensile stress on the outer edge and the compressive stress on the inner edge all acts toward the middle, which causes the diameter of the bending part of the pipe on the horizontal plane to increase, and the diameter on the vertical plane decreases, resulting in an elliptical shape. At the same time, if the parameters of the arc groove of the bending die are not properly selected and cannot strengthen the tube wall at the bending part, the inner edge of the tube will produce wave-shaped wrinkles under the action of compressive stress due to the low critical force of tube wall instability. From the above analysis, it can be seen that the thin-walled steel pipe is easy to produce wrinkle defects when it is bent. Therefore, when designing thin-walled steel pipe bending molds, its structural parameters must be reasonably determined, so that when the steel pipe is bent, the pipe generates a pre-load reaction force under the action of the mold to offset the elliptical deformation generated when the thin-walled steel pipe is bent. Reasonable control of wrinkle defects.

Prefabricated thin-walled pipes are a new generation of high-quality prefabricated thin-walled pipes. The special technology of prefabricated thin-walled pipe adds 8 reinforcing ribs to the thin-walled pipe. Compared with the existing similar products on the market, it has higher strength, thinner wall, lighter weight, non-combustible, standardized hole formation, simple installation and construction, and strengthens the reinforcement. No rust, low cost, etc. The prefabricated thin tube is made of sulfoaluminate or ferro-aluminate cement, fly ash as the cementing material, glass fiber as the reinforcing material, and appropriate amount of sand, water, and modifiers. Under the action of machinery and molds Compounded. It has obvious 1. Excellent use function 2. Low comprehensive cost 3. No ceiling in the room 4. Really flexible space interval 5. Reduced dead weight 6. Good seismic performance 7. Excellent sound insulation effect 8. Significant building energy saving effect 9. Economical construction. Convenience and other excellent features.

Stainless steel pipes are safe, reliable, hygienic, environmentally friendly, economical and applicable. The thin-walled pipes and the successful development of new reliable, simple and convenient connection methods give it more irreplaceable advantages for other pipes, and more and more applications in engineering , The use will become more and more popular, and the prospects are promising. There are many ways to connect stainless steel pipes. Common types of pipe fittings include compression, compression, articulation, push-in, push-thread, socket welding, articulated flange connection, welding, and welding and traditional connections. Combined derivative series connection method. These connection methods have different applicable scopes according to their different principles, but most of them are easy to install, firm and reliable. The sealing ring or gasket material used in the connection is mostly silicone rubber, nitrile rubber and EPDM rubber that meet the requirements of national standards.

Thin-walled tubes are made of steel ingots or solid tube billets through perforation to make capillary tubes, and then hot-rolled, cold-rolled or cold-rolled. Thin-walled pipe has an important position in my country's steel pipe industry. Classification of thin-walled pipes: seamless steel pipes are divided into two categories: hot-rolled and cold-rolled (dial) seamless steel pipes. Hot-rolled seamless steel pipes are divided into general steel pipes, low- and medium-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

The thin-walled stainless steel tube is made of steel ingots or solid tube billets through perforation into capillary tubes, and then hot rolled, cold rolled or cold drawn. Thin-walled pipe has an important position in my country's steel pipe industry. The raw material of the thin-walled tube is a round tube blank. The round tube blank is cut by a cutting machine into a billet with a length of about 1 meter, and is sent to the furnace for heating via a conveyor belt. The stainless steel thin-walled tube processing process The billet is sent into the furnace Heating, the temperature is about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key issue. After the round tube is out of the furnace, it must be pierced through a pressure piercing machine. Generally, the more common piercing machine is the tapered roller piercing machine. This type of piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can wear a variety of steel types. After piercing, the round tube billet is cross-rolled, continuous rolled or squeezed by three rolls one after another. After squeezing, take off the tube and calibrate. The sizing machine uses a conical drill bit to rotate at a high speed into the steel blank to punch holes to form a steel pipe. The inner diameter of the steel pipe is determined by the length of the outer diameter of the drill bit of the sizing machine. After the stainless steel thin-walled pipe is sized, it enters the cooling tower and is cooled by spraying water. After the steel pipe is cooled, it will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by the conveyor belt for internal flaw detection. If there are cracks, bubbles, etc. inside the steel pipe, it will be detected. After the quality inspection of stainless steel thin-walled pipes, strict manual selection is required. After the quality inspection of the steel pipe, paint the serial number, specification, production batch number, etc. with paint. It is hoisted into the warehouse by a crane.