Machining method for improving corrosion resistance of gas storage tank

Abstract

The invention discloses a processing method for improving corrosion resistance of a gas storage tank, which comprises the following process steps of: (1) mounting a pipe blank on a core mold of a spinning machine, communicating the blank with pulse current, rotating a main shaft, spinning, and thinning through a spinning roller to obtain a cylinder body of the gas storage tank; (2) an air storage tank barrel is connected to a spindle of the spinning machine, the air storage tank barrel is communicated with pulse current, the spindle rotates, meanwhile, a heating gun is used for heating an opening, and closing is started when the temperature is higher than 600 DEG C; and (3) spinning is conducted according to the motion trail of the spinning roller, after spinning is completed, the heating gun is turned off, the rotating speed feed ratio is adjusted, the spinning roller is thinned along the outer surface of the closing opening, electrification is stopped, and the gas storage tank is obtained. According to the gas storage tank, the requirements for economical efficiency and safety of the gas storage tank are met at the same time, the production efficiency is high, the gas storage tank has high strength and size precision, the corrosion resistance is improved, the product consistency is high, and the gas storage tank is suitable for a small-batch multi-variety production mode.

Description

Technical Field

[0001] The invention relates to the field of gas storage tank processing, and particularly to a processing method for improving the corrosion resistance of gas storage tanks Background Art

[0002] Gas storage tanks have many application scenarios in modern industry and life. High-pressure bearing capacity and sealing performance are their main evaluation indicators. Carbon steel, due to its high strength, low cost, and easy processing characteristics, meets the requirements of general industrial occasions. However, carbon steel materials have poor corrosion resistance and require post-treatment for corrosion prevention. Moreover, the processing of gas storage tanks is difficult, and it is hard to ensure both the processing dimensional accuracy and production efficiency of gas storage tanks at the same time Summary of the Invention

[0003] The purpose of this invention is to meet the requirements of both the economy and safety of gas storage tanks, and provides a processing method for improving the corrosion resistance of gas storage tanks. It has high production efficiency, the gas storage tank has high strength and dimensional accuracy, and its corrosion resistance is improved, with high product consistency, suitable for small-batch and multi-variety production modes

[0004] The purpose of the invention is achieved through the following technical solutions (1) Install the pipe blank on the mandrel of the spinning machine. The blank is connected to a pulsed current, the main shaft rotates, and spinning is carried out. Thinning is achieved through the spinning wheel to obtain the gas storage tank cylinder (2) Connect the gas storage tank cylinder to the main shaft of the spinning machine. The gas storage tank cylinder is connected to a pulsed current, the main shaft rotates, and at the same time, the mouth part is heated with a heating gun. When the temperature is higher than 600 °C, start closing the mouth (3) Carry out spinning through the movement trajectory of the spinning wheel. After spinning is completed, turn off the heating gun, adjust the rotational speed feed ratio, and the spinning wheel thins along the outer surface of the closed mouth. Stop energizing to obtain the gas storage tank

[0005] In a preferred embodiment of the invention, the material of the gas storage tank in step (1) is carbon steel

[0006] In a preferred embodiment of the invention, the current of the pulsed DC power supply in step (1) is 1200 - 1300 A, and the current density is 18 - 22 A / mm 2 .

[0007] In a preferred embodiment of the invention, the rotational speed of the main shaft in step (1) is 50 - 100 r / min

[0008] In a preferred embodiment of the invention, the feed ratio in step (1) is 0.3 - 0.5 mm / r

[0009] In a preferred embodiment of the invention, the current of the pulsed DC power supply in step (2) is 1300 - 1500 A, and the current density is 25 - 30 A / mm 2。

[0010] In a preferred embodiment of the present invention, in step (2), the spindle speed is 800 - 1000 r / min.

[0011] In a preferred embodiment of the present invention, in step (2), the heating temperature of the heating gun is 650 - 680 °C.

[0012] In a preferred embodiment of the present invention, in step (3), control the movement trajectory of the spinning wheel to complete sealing within 2 - 3 minutes.

[0013] In a preferred embodiment of the present invention, in step (3), the spindle speed is adjusted to 300 - 400 r / min, the feed ratio is adjusted to 1 - 1.5 mm / r, and the pressing amount of the spinning wheel along the side wall of the outer surface of the necking is 0.5 - 0.8 mm to achieve the sealing of the tank mouth.

[0014] In a preferred embodiment of the present invention, it is characterized in that the blank material of the gas storage tank is 35CrMo or 30CrMnSiA.

[0015] The present invention has the following beneficial effects compared with the prior art: The present invention has high production efficiency, the gas storage tank has high strength and dimensional accuracy, and its corrosion resistance is improved, the product consistency is high, and it meets the requirements of the economy and safety of the gas storage tank, and is suitable for the small - batch and multi - variety production mode. Detailed implementation mode

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0017] Example 1 A processing method for improving the corrosion resistance of a gas storage tank, and the processing steps are as follows: (1) Install the tube blank on the spinning machine mandrel, connect the blank to the pulsed current, the current of the pulsed DC power supply is 1200 A, and the current density is 20 / mm 2 , the spindle rotates, the speed is 50 r / min, the feed ratio is 0.5 mm / r, perform spinning, and obtain the gas storage tank cylinder by thinning with the spinning wheel. The blank material of the gas storage tank is 35CrMo; (2) Connect the gas storage tank cylinder to the spinning machine spindle, connect the gas storage tank cylinder to the pulsed current, the current of the pulsed DC power supply is 1500 A, and the current density is 25 A / mm 2, the main shaft rotates at a speed of 800 r / min. At the same time, the mouth is heated with a heating gun, and the heating temperature of the heating gun is 650 °C. Necking starts when the temperature is higher than 600 °C; (3) Spin - press through the movement trajectory of the spinning wheel to complete sealing within 2 minutes. After spin - pressing, turn off the heating gun, adjust the speed to 300 r / min, adjust the feed ratio to 1 mm / r, and press down the spinning wheel by 0.5 mm along the side wall of the outer surface of the necking to achieve the sealing of the tank mouth. The spinning wheel thins along the outer surface of the necking, stop electrifying, and then the gas storage tank is obtained.

[0018] Example 2 A processing method for improving the corrosion resistance of a gas storage tank, and the processing steps are as follows: (1) Install the tubular blank on the core - die of the spinning machine, connect the blank to a pulsed current, the current of the pulsed DC power supply is 1200 - 1300 A, and the current density is 18 - 22 A / mm 2 , the main shaft rotates at a speed of 50 - 100 r / min, the feed ratio is 0.3 - 0.5 mm / r, perform spin - pressing, and thin through the spinning wheel to obtain the cylinder of the gas storage tank. The material of the gas storage tank blank is 30CrMnSiA; (2) Connect the cylinder of the gas storage tank to the main shaft of the spinning machine, connect the cylinder of the gas storage tank to a pulsed current, the current of the pulsed DC power supply is 1300 - 1500 A, and the current density is 25 - 30 A / mm 2 , the main shaft rotates, and the main shaft speed is 800 - 1000 r / min. At the same time, the mouth is heated with a heating gun, and the heating temperature of the heating gun is 650 - 680 °C. Necking starts when the temperature is higher than 600 °C; (3) Spin - press through the movement trajectory of the spinning wheel to complete sealing within 2 - 3 minutes. After spin - pressing, turn off the heating gun, adjust the speed to 300 - 400 r / min, adjust the feed ratio to 1 - 1.5 mm / r, and press down the spinning wheel by 0.5 - 0.8 mm along the side wall of the outer surface of the necking to achieve the sealing of the tank mouth. The spinning wheel thins along the outer surface of the necking, stop electrifying, and then the gas storage tank is obtained.

[0019] After spin - forming, the diameter of the gas tank is 150 - 250 mm, and the wall thickness is 2 - 5 mm; the chemical composition meets the standards of 35CrMo and 30CrMnSiA. There is no leakage in the 200 PSI pressure test, the tank body has no deformation at 400 PSI pressure, the deformation is less than 0.8% after maintaining 5 minutes at 750 PSI pressure, and the bursting pressure is greater than 750 PSI, meeting the design requirements of the gas tank.

[0020] In view of the requirements for the economy and safety of gas storage tanks, the present invention provides a processing method for improving the corrosion resistance of gas storage tanks, which has high production efficiency. The gas storage tanks have high strength and dimensional accuracy, and their corrosion resistance is improved, with high product consistency, and is suitable for the production mode of small batches and multiple varieties.

[0021] The content not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

[0022] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions in the specification of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solutions of the present invention all fall within the protection scope of the technical solutions of the present invention.

Claims

1. A processing method for improving the corrosion resistance of a gas storage tank, characterized in that, It includes the following steps: (1) Install the tubular blank on the mandrel of the spinning machine. Connect the blank to the pulsed current. Rotate the main shaft and perform spinning. Thinning is carried out through the spinning wheel to obtain the cylinder body of the gas storage tank. (2) Connect the cylinder body of the gas storage tank to the main shaft of the spinning machine. Connect the cylinder body of the gas storage tank to the pulsed current. Rotate the main shaft. At the same time, use a heating gun to heat the mouth part. Start necking when the temperature is higher than 600 °C. (3) Perform spinning through the movement track of the spinning wheel. After spinning is completed, turn off the heating gun. Adjust the rotational speed feed ratio. The spinning wheel thins along the outer surface of the necking. Stop energizing to obtain the gas storage tank.

2. The processing method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (1), the material of the gas storage tank is carbon steel.

3. The processing method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, Step (1) The current of the pulsed DC power supply is 1200 - 1300 A, and the current density is 18 - 22 A / mm 2 .

4. The processing method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (1), the rotational speed of the main shaft is 50 - 100 r / min.

5. The processing method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (1), the feed ratio is 0.3 - 0.5 mm / r.

6. The processing method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (2), the current of the pulsed DC power supply is 1300 - 1500 A, and the current density is 25 - 30 A / mm 2 .

7. The processing method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (2), the rotational speed of the main shaft is 800 - 1000 r / min.

8. The processing method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (2), the heating temperature of the heating gun is 650 - 680 °C.

9. The process method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (3), control the movement track of the spinning wheel and complete sealing within 2 - 3 minutes.

10. The process method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, In step (3), adjust the rotational speed of the main shaft to 300 - 400 r / min, adjust the feed ratio to 1 - 1.5 mm / r, and the pressing amount of the spinning wheel along the side wall of the outer surface of the necking is 0.5 - 0.8 mm to achieve the sealing of the mouth part of the tank body.

11. The process method for improving the corrosion resistance of a gas storage tank according to claim 1, characterized in that, The blank material of the gas storage tank is 35CrMo or 30CrMnSiA.