SU935154A1 - Measured tube production method - Google Patents

Description

(54) METHOD OF MAKING MEASUREMENT PIPES

one

The invention relates to mechanical engineering and can be used in the manufacture of electric welded pipes.

There is a known method of manufacturing measuring pipes, in which a pipe is formed from a continuous line, welded and cut into measuring blanks. In this method, continuously formed pipes are cut into dimensional workpieces by means of a cutting device, which synchronously moves with the pipe. The synchronization is achieved by connecting the cutting device during the cut cycle with the moving tube 1.

The disadvantage of this method is that it is unacceptable for very thin-walled pipes, which have low longitudinal and transverse stability and therefore cannot be used as a link transporting the cutting device. In addition, when the cutting device is connected to the pipe mechanically (for example, with the help of books), it is possible that the pipe is scratched. This is not allowed in the manufacture of special products from thin-walled pipes.

The known method does not allow the use of universal stamps for dimensional cutting. This is due to the fact that the pipe is continuously moving, so it is impossible to precisely establish the matrix and punch. These disadvantages do not allow the use of a known method in production for cutting continuously formable and welded pipes.

The aim of the invention is to increase the quality and productivity of processing 10.

The goal is achieved by the fact that in the manufacture of measuring pipes, in which a pipe is formed from a continuous tape, welded and cut into measuring blanks, the pipe is cut into measured lengths with

15 stopping the pipe and moving the forming die with the welding device in the opposite direction to the forming.

The total speed of the pipe and die 20 at each time point is equal to the specified welding speed.

FIG. 1 shows a diagram of an apparatus for implementing the method; in fig. 2 is a block diagram; in fig. 3 is a graph of speed changes.

pipes; in fig. 4 is a graph showing the change in speed of the spinneret with a welding device; in fig. 5 is a graph of the total speed of movement of the pipe and forming die with a welding head equal to a given welding speed.

A device for implementing the method according to FIG. 1 comprises a roller 1 with a metal tape 2, a wiper 3, wiring 4, roller block 5, shantu b, guide rollers 7, pneumatic sensitive sensor 8, slotted spinneret 9, welding device 10, refrigerator 11, t is the driving mechanism 12, sensor 13 the length of the pipe, the cutting device 14, the frame 15, the mechanism 16 for moving the slit die 9 with the welding device 10. The block diagram (Fig. 2) shows a continuously formable pipe 17, a sensor 13 for the length of the pipe, an input device 18, a control device 19, output devices 20, drive 21 t of the lower gear 12, drive 22 mechanisms 16 for moving the slotted die with a welding head. Roller 1, wiper 3, wiring 4, roller block 5, shtanga 6, guide rollers 7, refrigerator 11, a driving mechanism 12, a length sensor 13, a cutting device 14, a die moving mechanism 16 with a welding device are fixedly mounted on the frame 15 The filler 9 with a welding device and a pneumatic sensor 8 is mounted for movement along the axis of the pipe on the frame 15.

The metal tape 2 is pulled through the wipe 3, guided in the wiring 4, molded in the roller block 5, guided by the rollers 7, pulled by a pulling mechanism 12 through the slit formed by the bolt 6 and the spinneret 9, where it is welded by the welding device 10 The pipe is then cooled in the refrigerator 11 and cut to the measured workpieces using a cutting device 14. The pneumatic sensor 8 serves to control the displacement of the edges of the tape. A standard pipe cutter or any other device for a similar purpose can be taken as a cutting device 14. With the passage of a pipe 17 of a certain length, a sensor of a length of pipe 13 will be triggered, which outputs a signal to an input device 18. An input device 18 outputs a signal to a device 19 that controls the activation of the drive 21 of the driving mechanism 12 and the drive 22 of the movement mechanism 16. The output devices 20 change the speeds of the drives 21 and 22 according to a predetermined program.

When the drive 21 reaches a speed equal to zero, the control device 19

outputs a signal to the pipe section 17. After the pipe sections are finished, the cutting device 14 sends a signal to the control device 19. The control device 19 according to a predetermined program changes the speed of the drive 22 to zero, and the speed of the drive 21 to a speed equal to the welding speed .

FIG. 3, 4 and 5, numeral I denotes the beginning of the change in speed, numeral

II - the end of the speed change and the beginning of the pipe cut operation, III - the moment of the beginning of the speed change at the end of the segments, IV - the moment of the end of the speed change

Drive speed t mechanism

decreases to zero, and the speed of movement of the die with the welding head increases to the welding speed. Move the die with a welding head towards the movement of the pipe. At the same time, the condition of constant total velocity equal to the specified welding speed of the pipe is preserved. When the drive speed of the driving mechanism is zero, the pipe is stationary. At this time, a pipe cut operation is performed. After completion of the operation, the segments

the pipe speed of the drive mechanism is smoothly increased, thereby smoothly increasing the speed of the pipe, and the speed of the forming die with a welding head is gradually reduced to zero.

The proposed method allows to provide a quality pipe section without synchronizing the movement of the cutting tools with the pipe and reducing the productivity of the process.

Claims (2)

1. A method of manufacturing measuring pipes in which a pipe is formed from a continuous tape, welded and cut into dimensional workpieces, characterized in that, in order to increase the quality and productivity of the process, the pipe is cut into measured lengths when the pipe is stopped and the forming die is moved welding device in the opposite direction to the molding. 2. A method according to claim 1, characterized in that the total speed of the pipe and the nozzle at each time point is equal to the specified welding speed. Sources of information taken into account during the examination 1. Yu. M. Matveev et al. Svarnyetruby. M., “Metallurgists, 1964, p. 50-81 (prototype). H «« - i phi2.2 17 Fyg.5